CN119103755A - Medium-shallow buried pipe ground source heat pump system and method based on load change control - Google Patents

Medium-shallow buried pipe ground source heat pump system and method based on load change control Download PDF

Info

Publication number
CN119103755A
CN119103755A CN202411417425.2A CN202411417425A CN119103755A CN 119103755 A CN119103755 A CN 119103755A CN 202411417425 A CN202411417425 A CN 202411417425A CN 119103755 A CN119103755 A CN 119103755A
Authority
CN
China
Prior art keywords
time
indoor
heat pump
load
buried pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202411417425.2A
Other languages
Chinese (zh)
Inventor
李振兴
赵璞
吴冰洁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hydrogeology Bureau of China National Administration of Coal Geology
Original Assignee
Hydrogeology Bureau of China National Administration of Coal Geology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hydrogeology Bureau of China National Administration of Coal Geology filed Critical Hydrogeology Bureau of China National Administration of Coal Geology
Priority to CN202411417425.2A priority Critical patent/CN119103755A/en
Publication of CN119103755A publication Critical patent/CN119103755A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/18—Hot-water central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention discloses a medium-shallow layer ground-source heat pump system and method based on load change control, wherein the system comprises a plurality of tail end devices arranged in a building, a ground-buried pipe group and a variable-frequency control system, wherein the ground-buried pipe group comprises a plurality of sleeve-type ground-buried pipes which are arranged in an array mode, the tail end devices, an indoor side circulating water pump and an indoor side circulating loop of a heat pump unit are in circulating communication to form the indoor side circulating loop for circulating indoor side circulating liquid, the sleeve-type ground-buried pipes, the underground side circulating water pump and the underground side circulating loop of the heat pump unit are in circulating communication to form the underground side circulating loop for circulating underground side circulating liquid, and the variable-frequency control system is connected with the indoor side circulating water pump and the underground side circulating water pump. The invention can accurately regulate the flow of indoor side circulating liquid and underground side circulating liquid based on load change, so that the system can be matched with the actual demand of a building in real time, the waste of energy is avoided, and the energy utilization efficiency is improved.

Description

Middle-shallow buried pipe ground source heat pump system and method based on load change control
Technical Field
The invention relates to the technical field of medium-shallow geothermal energy ground source heat pumps, in particular to a medium-shallow buried pipe ground source heat pump system and a method based on load change control.
Background
The ground source heat pump system is a technology for refrigerating and heating a building by utilizing geothermal energy, and is used for discharging the heat of a room of the building to the ground in summer to realize refrigeration, and absorbing the heat from an underground medium in winter for heating the building. The prior geothermal energy is mainly utilized by shallow geothermal energy or middle-deep geothermal energy, but the heat exchange capacity of a single ground heat exchanger of a shallow geothermal heat pump system is smaller, and the middle-deep geothermal energy can only be used for single heating and cannot be used as a cold source of a building.
Based on the above problems, more and more attention is focused on the utilization of middle-shallow geothermal energy, the burial depth of the middle-shallow buried pipe heat exchanger is generally 200-500m, compared with the shallow buried pipe heat exchanger, the middle-shallow buried pipe heat exchanger has the characteristics of small occupied area and large heat exchange capacity of a single buried pipe heat exchanger, and compared with the middle-deep buried pipe heat exchanger, the middle-shallow buried pipe heat exchanger has the characteristics of heating, refrigerating and low drilling cost.
However, the application of the conventional medium-shallow ground pipe heat source heat pump is less, and research for improving the system efficiency is lacking, so that a medium-shallow ground pipe ground source heat pump system and method based on load change control are needed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a medium-shallow buried pipe ground source heat pump system and a method based on load change control.
The invention discloses a medium-shallow buried pipe ground source heat pump system based on load change control, which comprises a plurality of terminal devices arranged in a building, and further comprises:
The system comprises a ground pipe burying group, a pipeline connecting device and a pipeline connecting device, wherein the ground pipe burying group comprises a plurality of sleeve type ground pipes which are arranged in an array manner;
An indoor circulating water pump, wherein the plurality of terminal devices, the indoor circulating water pump and the indoor side of the heat pump unit are in circulating communication to form an indoor circulating loop for circulating indoor circulating liquid;
the underground side circulating water pump is used for circularly communicating the sleeve type buried pipes, the underground side circulating water pump and the underground side of the heat pump unit to form an underground side circulating loop for circulating underground side circulating liquid;
the variable frequency control system is connected with the indoor side circulating water pump and the underground side circulating water pump.
As a further improvement of the invention, a plurality of sleeve-type ground buried pipes are respectively arranged in corresponding drilling holes, the drilling holes are arranged in a rectangular array, and backfill materials are uniformly filled in the drilling holes corresponding to the outer sides of the sleeve-type ground buried pipes;
the longitudinal spacing and the transverse spacing of a plurality of the drill holes are 5m-10m.
As a further improvement of the invention, the sleeve type buried pipe is composed of a stainless steel outer pipe and a high-density polyethylene inner pipe sleeved inside the stainless steel outer pipe, a liquid inlet area with descending flow is formed inside the high-density polyethylene inner pipe, and a reflux area with ascending flow is formed between the high-density polyethylene inner pipe and the stainless steel outer pipe;
The reflux areas of the sleeve type buried pipes are connected in parallel and then are connected with the inlet end of the underground side circulating water pump, the outlet end of the underground side circulating water pump is connected with the underground side inlet end of the heat pump unit, and the underground side outlet end of the heat pump unit is respectively connected with the liquid inlet areas of the sleeve type buried pipes.
As a further improvement of the invention, the water inlet ends of the plurality of terminal devices are connected in parallel and then connected with the outlet end of the indoor circulating water pump, the water return ends of the plurality of terminal devices are connected in parallel and then connected with the indoor inlet end of the heat pump unit, and the indoor outlet end of the heat pump unit is connected with the inlet end of the indoor circulating water pump.
The invention also discloses a method for controlling the medium-shallow buried pipe ground source heat pump system based on load change, which is applied to the medium-shallow buried pipe ground source heat pump system and comprises the following steps:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
and S2, controlling the rotating speeds of the indoor side circulating water pump and the underground side circulating water pump by the variable frequency control system based on the obtained time-by-time load so as to regulate the flow of indoor side circulating liquid and underground side circulating liquid.
As a further improvement of the present invention, when the summer cooling load is changed, specifically including:
acquiring time-by-time cooling load of a building;
Calculating the time-by-time flow of indoor circulating liquid according to a heat calculation formula q1=cm Δt, wherein Q1 is time-by-time cooling load, c is the specific heat capacity of the indoor circulating liquid, m is the time-by-time flow of the indoor circulating liquid, and Δt is the temperature difference value of the indoor circulating liquid entering and exiting the heat pump unit;
Controlling the rotating speed of the indoor circulating water pump according to the time-by-time flow of the indoor circulating liquid;
Calculating the time-by-time flow of the circulating liquid at the underground side according to a heat calculation formula Q < 2 > = Q+W, wherein Q < 2 > is the heat released to the underground by the circulating liquid at the underground side, Q < 1 > is the time-by-time cooling load, and W is the time-by-time power consumption of the heat pump unit;
and controlling the rotating speed of the underground side circulating water pump according to the time-by-time flow of the underground side circulating liquid.
As a further improvement of the present invention, when the winter heat load is changed, specifically including:
Acquiring time-by-time heat load of a building;
Calculating the time-by-time flow of the indoor side circulating liquid according to a heat calculation formula Q3=cm delta t, wherein Q3 is the time-by-time heat load, c is the specific heat capacity of the indoor side circulating liquid, m is the time-by-time flow of the indoor side circulating liquid, and delta t is the temperature difference value of the indoor side circulating liquid entering and exiting the heat pump unit;
Controlling the rotating speed of the indoor circulating water pump according to the time-by-time flow of the indoor circulating liquid;
calculating the time-by-time flow of the circulating liquid at the underground side according to a heat calculation formula Q4 = Q3-W, wherein Q4 is the underground heat absorbed by the circulating liquid at the underground side, Q3 is the time-by-time heat load, and W is the time-by-time power consumption of the heat pump unit;
and controlling the rotating speed of the underground side circulating water pump according to the time-by-time flow of the underground side circulating liquid.
The invention also discloses a method for controlling the medium-shallow buried pipe ground source heat pump system based on load change, which is applied to the medium-shallow buried pipe ground source heat pump system and comprises the following steps:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
S2, calculating the proportion of the peak load occupied by the acquired time-by-time load to obtain a proportion value;
and S3, controlling the number of the sleeve type buried pipes put into operation in the buried pipe group according to the calculated proportion value.
As a further improvement of the present invention, for summer cooling load, specifically, it includes:
Acquiring a time-by-time cooling load of the building;
calculating the proportion of the peak cold load occupied by the acquired time-by-time cold load to obtain a proportion value;
when the ratio value is not more than 0.75, only opening the sleeve type buried pipe at the outermost layer in the buried pipe group;
When the ratio value is greater than 0.75, sequentially opening the multi-layer sleeve type buried pipes in the buried pipe group from outside to inside;
For winter thermal loads, specifically including:
acquiring a time-by-time heat load of the building;
Calculating the proportion of the peak heat load occupied by the acquired time-by-time heat load to obtain a proportion value;
when the ratio value is not more than 0.75, only opening the sleeve type buried pipe at the outermost layer in the buried pipe group;
When the ratio value is larger than 0.75, sequentially opening the multi-layer sleeve type buried pipes in the buried pipe group from outside to inside.
As a further improvement of the invention, the sleeve type buried pipes positioned on the same layer are sequentially opened in a anticlockwise manner;
The opening quantity of the sleeve type buried pipes is 1/16 of the proportional value.
Compared with the prior art, the invention has the beneficial effects that:
The ground pipe embedding group of the invention adopts a plurality of sleeve-type ground pipes which are arranged in an array manner, so that heat is transferred between the inner pipe and the outer pipe more efficiently, thereby improving the heat exchange capacity of a single ground pipe embedding heat exchanger, more efficiently providing cold or heat for a building, meeting the requirements of refrigeration and heating and improving the heat exchange efficiency.
According to the invention, the rotating speeds of the indoor side circulating water pump and the underground side circulating water pump can be accurately controlled through the variable frequency control system according to the time-by-time load change of the building, so that the flow rates of the indoor side circulating liquid and the underground side circulating liquid are regulated, the system can be matched with the actual requirements of the building in real time, the waste of energy sources is avoided, and the energy source utilization efficiency is improved.
The invention can quickly respond and adjust the operation parameters for summer cold load and winter heat load, and meet the refrigerating and heating demands of the building in different seasons and different time periods.
Drawings
FIG. 1 is a schematic diagram of a mid-shallow buried pipe ground source heat pump system based on load change control according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the structure and installation of a sleeve type buried pipe of a medium-shallow layer buried pipe ground source heat pump system based on load change control according to an embodiment of the present invention;
FIG. 3 is a borehole array layout of a mid-shallow buried pipe ground source heat pump system based on load variation control according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for controlling a medium-shallow buried pipe ground source heat pump system based on load variation according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for controlling a middle-shallow buried pipe ground source heat pump system based on load change according to another embodiment of the present invention.
In the figure:
1. An end device; 2, an indoor side circulating water pump, 3, an underground side circulating water pump, 4, a heat pump unit, 5, a variable frequency control system, 6, a sleeve type buried pipe, 7, an underground side circulating liquid, 8, an inner pipe, 9, an outer pipe, 10, a backfill material, 11, a drilling hole, 12 and a geodetic layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention is described in further detail below with reference to the attached drawing figures:
As shown in fig. 1, the middle-shallow layer ground-source heat pump system based on load change control provided by the invention comprises end equipment 1, a ground-buried pipe group, an indoor side circulating water pump 2, an underground side circulating water pump 3, a heat pump unit 4 and a variable frequency control system 5, wherein the end equipment 1 is arranged in a building and is used for realizing heating and cooling in a room, the ground-buried pipe group comprises a plurality of sleeve-type ground-buried pipes 6 which are arranged in an array mode, the indoor side circulating water pumps 2 and 4 of the end equipment 1 are in indoor side circulating communication to form an indoor side circulating loop through which indoor side circulating liquid circulates, the sleeve-type ground-buried pipes 6, the underground side circulating water pump 3 and the underground side circulating water pump 4 are in underground side circulating communication to form an underground side circulating loop through which underground side circulating liquid 7 circulates, the variable frequency control system 5 is connected with the indoor side circulating water pump 2 and the underground side circulating water pump 3, and the variable frequency control system 5 controls the rotation speed of the indoor side circulating water pump 2 and the underground side circulating water pump 3 through controlling motor frequency.
In this embodiment, preferably, the buried pipe group adopts a plurality of sleeve-type buried pipes 6 arranged in an array manner, so that heat is transferred between the inner pipe and the outer pipe more efficiently, the heat exchange capacity of a single buried pipe heat exchanger is improved, the cooling capacity or the heat can be provided for a building more efficiently, the cooling and heating requirements are met, the heat exchange efficiency is improved, meanwhile, the rotating speeds of the indoor side circulating water pump 2 and the underground side circulating water pump 3 can be precisely controlled through the variable frequency control system 5 according to the time-by-time load change of the building, the flow rates of the indoor side circulating liquid and the underground side circulating liquid 7 are regulated, the actual requirement of the building can be matched in real time by the system, the waste of energy sources is avoided, and the energy utilization efficiency is improved.
Specific:
As shown in fig. 2-3, in the above-described embodiments, preferably a plurality of casing pipes 6 are each installed in a corresponding borehole 11. In actual construction, the plurality of drilling holes 11 are dug in the earth rock layer 12 in a rectangular array, the longitudinal spacing and the transverse spacing of the plurality of drilling holes 11 are 5-10m, and the arrangement mode can effectively utilize the ground area. The outer sides of the corresponding sleeve-type buried pipes 6 in the plurality of drill holes 11 are uniformly filled with backfill materials 10, wherein the backfill materials 10 are formed by combining bentonite, fine sand and cement, and are uniformly backfilled in the gaps of the drill holes 11.
In the above embodiment, the sleeve-type buried pipe 6 is preferably composed of the outer pipe 9 and the inner pipe 8 sleeved inside the outer pipe, wherein a liquid inlet region for downward flow is formed inside the inner pipe 8, and a backflow region for upward flow is formed between the inner pipe 8 and the outer pipe 9. In actual assembly, the backflow areas of the sleeve type buried pipes 6 are connected in parallel and then connected with the inlet end of the underground side circulating water pump 3, the outlet end of the underground side circulating water pump 3 is connected with the underground side inlet end of the heat pump unit 4, and the underground side outlet end of the heat pump unit 4 is respectively connected with the liquid inlet areas of the sleeve type buried pipes 6.
In the above embodiment, the installation depth of the casing pipe 6 is preferably 200-500m.
In the above embodiment, the outer tube 9 is preferably a stainless steel tube for fixing the buried pipe, and the inner tube 8 is a high-density polyethylene tube having superior heat conduction capability, compression resistance and corrosion resistance.
In the above embodiment, it is preferable that the water inlet ends of the plurality of terminal devices 1 are connected in parallel and then connected to the outlet end of the indoor circulating water pump 2, the water return ends of the plurality of terminal devices 1 are connected in parallel and then connected to the indoor inlet end of the heat pump unit 4, and the indoor outlet end of the heat pump unit 4 is connected to the inlet end of the indoor circulating water pump 2.
In the above embodiment, the heat pump unit 4 is preferably used for heat transfer between the underground side circulating liquid 7 and the indoor side circulating liquid.
In the above embodiment, it is preferable that the indoor side circulation liquid circulates between the terminal equipment 1 and the heat pump unit 4, heat obtained from the heat pump unit 4 is released to the indoor in winter, heat in the indoor is absorbed in summer and then transferred to the refrigerant of the heat pump unit 4, the underground side circulation liquid 7 is pure water, circulates between the sleeve-type buried pipe 6 and the heat pump unit 4, heat is transferred to the refrigerant of the heat pump unit 4 after absorbing heat from the underground in winter, and heat in the indoor is transferred to the underground side circulation liquid 7 through the refrigerant in summer.
In the above embodiment, the variable frequency control system 5 may calculate and obtain the time-by-time load of the building according to the outdoor weather parameters and the indoor temperature requirements.
In the above-described embodiments, preferably, valves are provided on the connecting branches of each of the casing pipes 6 in order to control the number of casing pipes 6 to be fed into the pipe string.
As shown in fig. 4, the method for controlling the middle-shallow buried pipe ground source heat pump system based on load change according to the present invention is applied to the middle-shallow buried pipe ground source heat pump system, and includes:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
In step S2, the variable frequency control system 5 controls the rotational speeds of the indoor side circulating water pump 2 and the underground side circulating water pump 3 by controlling the motor frequency based on the obtained time-by-time load, so as to adjust the flow rates of the indoor side circulating liquid and the underground side circulating liquid 7.
Examples:
Taking 2000m 2 office building as an example, the cooling time is 3 months (6 months 15 days to 9 months 15 days) per year, the heating time is 4 months (11 months 15 days to 3 months 15 days of the next year), because the ground source heat pump system is intermittently operated, namely, the operation time period is 8:00 a.m. to 18:00 a.m. per day, the outdoor design temperature in summer is 31.3 ℃, the indoor design temperature is 26 ℃, the variation range of the cold load is 0-246kW, the outdoor design temperature in winter is-7 ℃, the indoor design temperature is 18 ℃, the variation range of the heat load is 0-172kW, and the specific example implementation method is as follows:
1) When the summer cooling load changes, the method specifically comprises the following steps:
acquiring time-by-time cooling load of a building;
Setting the temperature difference delta t of indoor side circulating liquid entering and exiting the heat pump unit 4 to be 5 ℃, and setting the temperature difference delta t of underground side circulating liquid 7 entering and exiting the heat pump unit 4 to be 5 ℃;
Calculating the time-by-time flow of the indoor side circulating liquid according to a heat calculation formula q1=cm Δt, wherein Q1 is the time-by-time cooling load, c is the specific heat capacity of the indoor side circulating liquid, m is the time-by-time flow of the indoor side circulating liquid, and Δt is the temperature difference value of the indoor side circulating liquid entering and exiting the heat pump unit 4;
controlling the rotating speed of the indoor circulating water pump 2 according to the time-by-time flow rate of the indoor circulating liquid;
Calculating the time-by-time flow of the circulating liquid at the underground side according to a heat calculation formula Q2 = Q+W, wherein Q2 is the heat released to the underground by the circulating liquid 7 at the underground side, Q1 is the time-by-time cooling load, and W is the time-by-time power consumption of the heat pump unit 4;
the rotation speed of the underground side circulating water pump 3 is controlled according to the time-by-time flow rate of the underground side circulating liquid 7.
2) When the winter heat load changes, the method specifically comprises the following steps:
Acquiring time-by-time heat load of a building;
setting the temperature difference delta t of indoor side circulating liquid entering and exiting the heat pump unit 4 to be 5 ℃, and setting the temperature difference delta t of underground side circulating liquid 7 entering and exiting the heat pump unit 4 to be 4 ℃;
calculating the time-by-time flow of the indoor circulating liquid according to a heat calculation formula q3=cm Δt;
Wherein Q3 is time-by-time heat load, c is specific heat capacity of indoor circulating liquid, m is time-by-time flow of indoor circulating liquid, and Deltat is temperature difference value of indoor circulating liquid entering and exiting the heat pump unit 4;
controlling the rotating speed of the indoor circulating water pump 2 according to the time-by-time flow rate of the indoor circulating liquid;
Calculating the time-by-time flow of the underground side circulating liquid 7 according to a heat calculation formula q4=q3-W;
wherein Q4 is the underground heat absorbed by the underground side circulating liquid 7, Q3 is the time-by-time heat load, and W is the time-by-time power consumption of the heat pump unit 4;
the rotation speed of the underground side circulating water pump 3 is controlled according to the time-by-time flow rate of the underground side circulating liquid.
As shown in fig. 5, the method for controlling the middle-shallow buried pipe ground source heat pump system based on load change according to the present invention is applied to the middle-shallow buried pipe ground source heat pump system, and includes:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
and step S2, calculating the proportion of the peak load occupied by the acquired time-by-time load to obtain a proportion value, wherein in the step S2, the peak load is acquired through simulation of Dest software.
And S3, controlling the number of the sleeve type buried pipes 6 put into operation in the buried pipe group according to the calculated proportion value.
The method comprises the following steps:
1) For summer cooling load, specifically include:
acquiring time-by-time cooling load of a building;
calculating the proportion of the peak cold load occupied by the acquired time-by-time cold load to obtain a proportion value;
When the ratio value is not more than 0.75, only opening the sleeve type buried pipe 6 at the outermost layer in the buried pipe group;
when the ratio value is larger than 0.75, sequentially opening the multi-layer sleeve type buried pipes 6 in the buried pipe group from outside to inside;
2) For winter thermal load, specifically include:
Acquiring time-by-time heat load of a building;
Calculating the proportion of the peak heat load occupied by the acquired time-by-time heat load to obtain a proportion value;
When the ratio value is not more than 0.75, only opening the sleeve type buried pipe 6 at the outermost layer in the buried pipe group;
when the ratio value is larger than 0.75, the multi-layer sleeve type buried pipes 6 in the buried pipe group are sequentially opened from outside to inside.
In the above-described embodiments, the casing pipes 6 located in the same layer are preferably opened in a counter-clockwise sequence, which opening sequence reduces the thermal interference between the different borehole casing pipes 6.
In the above embodiment, it is preferable that the opening number of the casing pipe type buried pipes 6 is 1/16 of the proportional value.
Examples:
Taking 2000m 2 office building as an example, there are 16 sleeve type ground buried pipes 6, and the 16 sleeve type ground buried pipes 6 are arranged in a rectangular array, wherein the outermost layer C1 layer has 12 drilled holes, and the secondary outer layer C2 layer close to the outermost layer C1 layer has 4 drilled holes. In the cooling stage in summer, the flow rate of the single-borehole underground side circulating liquid 7 is set to be 2.5m 3/h, and in the heating stage in winter, the flow rate of the single-borehole underground side circulating liquid 7 is set to be 1.8m 3/h. The indoor circulating liquid can be adjusted according to the variable flow rate.
1) And the peak value of the summer cold load is 246kW, when the proportion of the time-by-time cold load to the peak value cold load is less than or equal to 0.75, only the C1 layer is started, and when the proportion of the time-by-time cold load to the peak value cold load is more than or equal to 0.75, the C1 layer and the C2 layer are started. As to how many boreholes are opened, the number of occupied ratios is divided by 0.0625 (1/16), and the whole number is taken.
2) The peak value of the heat load in winter is 172kW, when the proportion of the heat load at time intervals is less than or equal to 0.75 of the peak value heat load, only the C1 layer is started, and when the proportion of the heat load at time intervals is more than or equal to 0.75 of the peak value heat load, the C1 layer and the C2 layer are started. As to how many boreholes are opened, the number of occupied ratios is divided by 0.0625 (1/16), and the whole number is taken.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A mid-shallow buried pipe ground source heat pump system based on load change control, comprising a plurality of end devices arranged in a building, characterized by further comprising:
The system comprises a ground pipe burying group, a pipeline connecting device and a pipeline connecting device, wherein the ground pipe burying group comprises a plurality of sleeve type ground pipes which are arranged in an array manner;
An indoor circulating water pump, wherein the plurality of terminal devices, the indoor circulating water pump and the indoor side of the heat pump unit are in circulating communication to form an indoor circulating loop for circulating indoor circulating liquid;
the underground side circulating water pump is used for circularly communicating the sleeve type buried pipes, the underground side circulating water pump and the underground side of the heat pump unit to form an underground side circulating loop for circulating underground side circulating liquid;
the variable frequency control system is connected with the indoor side circulating water pump and the underground side circulating water pump.
2. A mid-shallow buried pipe ground source heat pump system according to claim 1, wherein a plurality of the sleeve-type buried pipes are respectively installed in corresponding drilling holes, the plurality of the drilling holes are arranged in a rectangular array, and backfill materials are uniformly filled in the plurality of the drilling holes corresponding to the outer sides of the sleeve-type buried pipes;
the longitudinal spacing and the transverse spacing of the plurality of drilling holes are both 5-10 m.
3. A mid-shallow buried pipe ground source heat pump system according to claim 1, wherein the sleeve type buried pipe is composed of a stainless steel outer pipe and a high-density polyethylene inner pipe sleeved inside the stainless steel outer pipe, a liquid inlet area with downward flow is formed inside the high-density polyethylene inner pipe, and a backflow area with upward flow is formed between the high-density polyethylene inner pipe and the stainless steel outer pipe;
The reflux areas of the sleeve type buried pipes are connected in parallel and then are connected with the inlet end of the underground side circulating water pump, the outlet end of the underground side circulating water pump is connected with the underground side inlet end of the heat pump unit, and the underground side outlet end of the heat pump unit is respectively connected with the liquid inlet areas of the sleeve type buried pipes.
4. The shallow-and-medium-layer ground-buried pipe ground-source heat pump system according to claim 1, wherein the water inlet ends of the plurality of terminal devices are connected in parallel and then connected with the outlet end of the indoor circulating water pump, the water return ends of the plurality of terminal devices are connected in parallel and then connected with the indoor inlet end of the heat pump unit, and the indoor outlet end of the heat pump unit is connected with the inlet end of the indoor circulating water pump.
5. A method of a mid-shallow buried pipe ground source heat pump system based on load variation control, which is applied to the mid-shallow buried pipe ground source heat pump system according to any one of claims 1 to 4, comprising:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
and S2, controlling the rotating speeds of the indoor side circulating water pump and the underground side circulating water pump by the variable frequency control system based on the obtained time-by-time load so as to regulate the flow of indoor side circulating liquid and underground side circulating liquid.
6. A method of a mid-shallow buried pipe ground source heat pump system according to claim 5, characterized in that it comprises, in particular, when the summer cooling load varies:
acquiring time-by-time cooling load of a building;
Calculating the time-by-time flow of indoor circulating liquid according to a heat calculation formula q1=cm Δt, wherein Q1 is time-by-time cooling load, c is the specific heat capacity of the indoor circulating liquid, m is the time-by-time flow of the indoor circulating liquid, and Δt is the temperature difference value of the indoor circulating liquid entering and exiting the heat pump unit;
Controlling the rotating speed of the indoor circulating water pump according to the time-by-time flow of the indoor circulating liquid;
Calculating the time-by-time flow of the circulating liquid at the underground side according to a heat calculation formula Q < 2 > = Q+W, wherein Q < 2 > is the heat released to the underground by the circulating liquid at the underground side, Q < 1 > is the time-by-time cooling load, and W is the time-by-time power consumption of the heat pump unit;
and controlling the rotating speed of the underground side circulating water pump according to the time-by-time flow of the underground side circulating liquid.
7. A method of a mid-shallow buried pipe ground source heat pump system according to claim 5, characterized in that it comprises, in particular, when the winter thermal load varies:
Acquiring time-by-time heat load of a building;
Calculating the time-by-time flow of the indoor side circulating liquid according to a heat calculation formula Q3=cm delta t, wherein Q3 is the time-by-time heat load, c is the specific heat capacity of the indoor side circulating liquid, m is the time-by-time flow of the indoor side circulating liquid, and delta t is the temperature difference value of the indoor side circulating liquid entering and exiting the heat pump unit;
Controlling the rotating speed of the indoor circulating water pump according to the time-by-time flow of the indoor circulating liquid;
calculating the time-by-time flow of the circulating liquid at the underground side according to a heat calculation formula Q4 = Q3-W, wherein Q4 is the underground heat absorbed by the circulating liquid at the underground side, Q3 is the time-by-time heat load, and W is the time-by-time power consumption of the heat pump unit;
and controlling the rotating speed of the underground side circulating water pump according to the time-by-time flow of the underground side circulating liquid.
8. A method of a mid-shallow buried pipe ground source heat pump system based on load variation control, which is applied to the mid-shallow buried pipe ground source heat pump system according to any one of claims 1 to 4, comprising:
Step S1, simulating and obtaining time-by-time load of a building through Dest software;
S2, calculating the proportion of the peak load occupied by the acquired time-by-time load to obtain a proportion value;
and S3, controlling the number of the sleeve type buried pipes put into operation in the buried pipe group according to the calculated proportion value.
9. A method of mid-shallow buried pipe ground source heat pump system according to claim 8, characterized in that for summer cooling load, it comprises in particular:
Acquiring a time-by-time cooling load of the building;
calculating the proportion of the peak cold load occupied by the acquired time-by-time cold load to obtain a proportion value;
when the ratio value is not more than 0.75, only opening the sleeve type buried pipe at the outermost layer in the buried pipe group;
When the ratio value is greater than 0.75, sequentially opening the multi-layer sleeve type buried pipes in the buried pipe group from outside to inside;
For winter thermal loads, specifically including:
acquiring a time-by-time heat load of the building;
Calculating the proportion of the peak heat load occupied by the acquired time-by-time heat load to obtain a proportion value;
when the ratio value is not more than 0.75, only opening the sleeve type buried pipe at the outermost layer in the buried pipe group;
When the ratio value is larger than 0.75, sequentially opening the multi-layer sleeve type buried pipes in the buried pipe group from outside to inside.
10.A method of a mid-shallow buried pipe ground source heat pump system according to claim 9, wherein the sleeve type buried pipes located at the same layer are sequentially opened in a counterclockwise direction;
The opening quantity of the sleeve type buried pipes is 1/16 of the proportional value.
CN202411417425.2A 2024-10-11 2024-10-11 Medium-shallow buried pipe ground source heat pump system and method based on load change control Pending CN119103755A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202411417425.2A CN119103755A (en) 2024-10-11 2024-10-11 Medium-shallow buried pipe ground source heat pump system and method based on load change control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202411417425.2A CN119103755A (en) 2024-10-11 2024-10-11 Medium-shallow buried pipe ground source heat pump system and method based on load change control

Publications (1)

Publication Number Publication Date
CN119103755A true CN119103755A (en) 2024-12-10

Family

ID=93713747

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202411417425.2A Pending CN119103755A (en) 2024-10-11 2024-10-11 Medium-shallow buried pipe ground source heat pump system and method based on load change control

Country Status (1)

Country Link
CN (1) CN119103755A (en)

Similar Documents

Publication Publication Date Title
CN102099577B (en) Thermal energy systems and methods of operation
KR101124361B1 (en) Hybrid form Subterranean-heat of Heat pump system
KR101524821B1 (en) Geothermal energy system and method of operation
KR101524820B1 (en) Geothermal energy system and method of operation
KR101124359B1 (en) Subterranean heat of Heat pump system use Heat exchanger
Momin Experimental investigation of geothermal air conditioning
KR101124358B1 (en) ubterranean heat of Heat pump system use Air heat pump and Well pump
CN2800177Y (en) Underground reservoir type geothermal energy transforming device
Dincer et al. A unique borehole thermal storage system at University of Ontario Institute of Technology
Sarbu et al. Solar-assisted heat pump systems
CN119103755A (en) Medium-shallow buried pipe ground source heat pump system and method based on load change control
CN1840984A (en) Buried reflux casing type circulating geothermal heat exchanger and use thereof
GB2482435A (en) Geothermal energy system and method of operation
GB2482437A (en) Geothermal energy system and method of operation
GB2482436A (en) Geothermal energy system and method of operation
KR101124357B1 (en) Subterranean heat of Heat pump system use Heat exchanger and Well pump
KR101124360B1 (en) Heat source storage type geothermal heat pump system using core pump
KR101124356B1 (en) Subterranean heat of Heat pump system use Air heat pump
He et al. Study of geothermal seasonal cooling storage system with energy piles
CN113343444A (en) Structural design method of double-U-shaped cold and hot dual-purpose ground heat exchanger
CN207162702U (en) With reference to the earth source heat pump heat exchanger system of house pile foundation
CN117073097A (en) Single-well multi-buried underground pipe air conditioning system and its cooling and heating methods
Zosseder Scenario Catalogue
CN107726503A (en) A kind of ground source pipe laying constant temperature system using conduction oil as heat transfer medium
CN115540107A (en) Stratum energy storage ground source heat pump air conditioning system and operation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination