CN115451618B - Heat control method of ground source heat pump - Google Patents
Heat control method of ground source heat pump Download PDFInfo
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- CN115451618B CN115451618B CN202211083670.5A CN202211083670A CN115451618B CN 115451618 B CN115451618 B CN 115451618B CN 202211083670 A CN202211083670 A CN 202211083670A CN 115451618 B CN115451618 B CN 115451618B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 19
- 230000002528 anti-freeze Effects 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000012546 transfer Methods 0.000 claims description 24
- 230000005855 radiation Effects 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 13
- 239000005357 flat glass Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000007710 freezing Methods 0.000 claims 1
- 239000000809 air pollutant Substances 0.000 abstract description 2
- 231100001243 air pollutant Toxicity 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- 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
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- 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
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Abstract
The invention provides a heat control method of a ground source heat pump, which comprises the steps of firstly, constructing an underground heat exchanger model according to temperature change when an antifreezing solution flows through a U-shaped pipeline of an underground heat exchanger in the ground source heat pump device when the ground source heat pump device works; and secondly, an indoor comfortable temperature model is built based on the change of heat in the closed space, and the ground source heat pump device controls the temperature of the closed space in a comfortable temperature interval by controlling the heat of the closed space. When the temperature of the closed space is not in the comfortable temperature range, the ground source heat pump device starts to work; when the temperature of the closed space is in the comfortable temperature range, the ground source heat pump device stops working. Thus, the intermittent operation mode not only can effectively relieve the voltage consumption of cities or factories, but also can greatly reduce the consumption of energy sources and the emission of air pollutants.
Description
Technical Field
The invention relates to the field of ground source heat pumps, in particular to a heat control method of a ground source heat pump.
Background
In order to cope with the increasingly serious climate problems, the development of distributed renewable energy sources has become a development direction of future power systems, and the energy problems are very prominent at present because of various reasons such as severe international situation. While a significant portion of the energy consumed is used for space heating and cooling, conventional natural gas heating and electric air conditioning applications are widespread in this regard, but they consume significant energy and also increase greenhouse gas emissions. There is a need for more efficient and environmentally friendly equipment for heating/cooling residential and commercial users, the role of which is highlighted by the ground source heat pump system. Because the ground source heat pump takes the earth surface and the underground soil as energy sources for supplying, the temperature of the underground soil is kept constant basically all the year round and is higher than the ambient temperature in winter, and at the moment, heat can be supplied to the room through the indoor and outdoor high temperature difference; the heat is radiated from the room through the indoor and outdoor high temperature difference when the temperature is lower than the ambient temperature in summer, and the energy conversion efficiency of the ground source heat pump system is very high and is far higher than that of the traditional cooling and heating equipment, so that a good refrigerating or heating effect can be achieved by consuming a small amount of electric energy, and a heating pipe network, a boiler, a central air conditioner and the like with high energy consumption can be replaced. In addition, the emission pollution of the ground source heat pump system is low, and if the ground source heat pump system is used for replacing heat supply equipment such as a boiler, the emission of greenhouse gases is greatly reduced.
The ground source heat pump improves the energy use efficiency, is efficient and environment-friendly, and has very wide development prospect. However, the existing work only roughly introduces the operation performance of the ground source heat pump and the advantages of the ground source heat pump in terms of cost and greenhouse gas emission, and does not study the change of the ground source heat pump system to the indoor temperature and the working principle thereof in detail, so that a ground source heat pump operation method considering the indoor temperature control needs to be studied.
Disclosure of Invention
The invention aims at: based on a preset indoor comfort model and an underground heat exchanger model, the temperature of the closed space is controlled within a preset comfort temperature interval by controlling the heat in the closed space.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The scheme provides a heat control method of a ground source heat pump, which is based on a preset indoor comfort model and an underground heat exchanger model, and comprises the following steps S1 to S6, wherein the heat in a closed space is controlled to control the temperature of the closed space in a preset comfort temperature range In which T is the lower limit value of the comfort temperature interval,/>Is the upper limit value of the comfortable temperature interval; the method comprises the following steps:
step S1: measuring the initial temperature T 0 in the enclosed space if S2-1, refrigerating the closed space by a ground source heat pump device; if T 0 is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
Step S2-1: the method comprises the steps that the ground source heat pump device starts refrigeration, antifreeze in the ground source heat pump device is cooled when flowing through a U-shaped pipeline of a ground heat exchanger in the ground source heat pump device, temperature change of the antifreeze in the U-shaped pipeline of the ground heat exchanger is calculated based on a preset ground heat exchanger model, and then heat output by the ground source heat pump device when the ground source heat pump device performs refrigeration operation on a closed space is calculated Then enter step S3;
Step S2-2: the method comprises the steps that a ground source heat pump device starts heating work, antifreeze in the ground source heat pump device is heated when flowing through a U-shaped pipeline of a ground heat exchanger in the ground source heat pump device, temperature change of the antifreeze in the U-shaped pipeline of the ground heat exchanger is calculated based on a preset ground heat exchanger model, and then heat output by the ground source heat pump device when the ground source heat pump device heats a closed space is calculated Then enter step S3;
step S3: heat absorbed by the ground source heat pump device during refrigeration operation Or heat evolved during heating operation/>Conversion to heat input into a closed space by a ground source heat pump device/>In a refrigerating state/>Is negative and in the heating state/>Positive value, then go to step S4;
step S4: according to a preset indoor comfortable temperature model, heat input into the closed space based on the ground source heat pump device Increased heat/>, when other appliances are operated in the roomHeat transfer from the interior to the outsideAccording to the change of the heat in the closed space, and according to the temperature T t-1 at the last moment in the closed space, the current temperature T t in the closed space is calculated, and then the step S5 is carried out;
Step S5: the current temperature T t in the closed space calculated in the step S4 and the upper limit value and the lower limit value of the comfortable temperature interval are calculated T comparison, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
Step S6: the temperature of the closed space is in a preset comfortable temperature interval, the ground source heat pump device stops working, the temperature in the closed space is measured at preset time intervals to obtain T t, and then step S7 is carried out;
Step S7: if it is Then return to step S6, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, the step S2-2 is entered, and the ground source heat pump device heats the enclosed space.
As a preferable technical scheme, in the steps S2-1 and S2-2, the heat quantity output by the ground source heat pump device to the closed space is calculated according to the following underground heat exchanger model based on the temperature change when the antifreeze in the ground source heat pump device flows through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump deviceOr/>
Wherein: heat output to the closed space during heating operation of the ground source heat pump device The heat output by the ground source heat pump device to the closed space during refrigeration operation is T t in which is the temperature of the antifreeze injected into the U-shaped pipe of the underground heat exchanger; t t out is the temperature of the antifreeze fluid flowing out of the U-shaped pipe of the underground heat exchanger; c f is the specific heat capacity of the antifreeze; m f is the mass flow rate of the antifreeze.
As a preferable technical scheme, the temperature T t in、Tt out of the antifreeze solution injected and discharged by the U-shaped pipe of the underground heat exchanger is determined by the underground heat exchange process of the ground source heat pump device, and the U-shaped pipe of the underground heat exchanger is divided into 50 sections for useRespectively representing temperature nodes of downward and upward flowing liquid in U-shaped pipes of the jth section of the underground heat exchanger at the moment t; respectively representing temperature nodes of grouting areas beside U-shaped pipes of the jth section of the underground heat exchanger at the moment t; /(I) The outer earth temperature node of the U-shaped pipe of the j-th section of the underground heat exchanger at the moment t; based on the temperature transfer relationship between the temperature nodes in the same section of the cross-sectional plane and the temperature transfer relationship in the longitudinal direction. The temperature of the antifreeze injected into and discharged from the U-shaped pipe can be expressed as:
Wherein: /(I) A temperature node for the first section of the antifreeze fluid flowing downwards for the U-shaped pipe of the underground heat exchanger;
Wherein: /(I) A temperature node for the first section of the antifreeze fluid flowing upwards for the U-shaped pipe of the underground heat exchanger;
the model of temperature transfer in the U-shaped pipe is as follows:
Wherein: Δx is the height of each section of the subterranean heat exchanger; v is the antifreeze flow rate in the underground heat exchanger; Δt is the time interval; hp f is the heat capacity of the antifreeze; r sx is the thermal resistance between the antifreeze and R b is the thermal resistance between the antifreeze and the grouting area;
Wherein: r bb is the thermal resistance between grouting areas; r g is the thermal resistance between the grouting area and the ground; hp b is the heat capacity of the grouting area of the underground heat exchanger;
Wherein: hp g is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the model is used for calculating the temperature T t in、Tt out of the antifreeze fluid injected and discharged into the U-shaped pipe of the underground heat exchanger at any moment.
In the step S3, the heat output by the ground source heat pump device during the refrigeration operation is outputOr heat output during heating operation/>Conversion to heat input to room by ground source heat pump device/>The formula used is as follows:
wherein: Inputting house heat for a ground source heat pump device; z t is a variable of 0-1, Z t is 0, the heat in the closed space is reduced when the ground source heat pump device is in a refrigerating state, and Z t is 1, the heat in the closed space is increased when the ground source heat pump device is in a heating state.
As a preferable technical scheme, the indoor comfortable temperature model calculates the change of the temperature in the closed space by calculating the heat input and output in the closed space, the heat increase in the closed space mainly depends on the heat input by the ground source heat pump device into a house, the solar radiation in the daytime and the heat generated by other electric appliances in the closed space, and the heat decrease in the closed space is the heat dissipation outwards through window glass and an outer wall, and the application formula is as follows:
In the middle of Inputting heat for the closed space; sigma is the solar radiation incidence coefficient; /(I)Is solar radiation power; /(I)Is the self-heating quantity of the closed space;
In the middle of Heat dissipation for the enclosed space; u W is the heat transfer coefficient of the surface of the window glass, and U E is the heat transfer coefficient of the outer wall; t t e is the outdoor ambient temperature; t t E is the temperature of the outer wall;
wherein, the expression of outer wall temperature is:
wherein Hp E is the heat capacity of the outer wall;
heat capacity Hp E, outdoor environment temperature T t e, solar radiation incidence coefficient sigma, window glass surface heat transfer coefficient U W, outer wall heat transfer coefficient U E and solar radiation power based on outer wall Enclosed space self-heating quantity/>Setting of the outer wall temperature T t E,/>The heat input and output in the enclosed space can be calculated, so that the current temperature of the enclosed space in the period of time can be calculated:
Wherein T t is the temperature of the enclosed space; hp r is the heat capacity in the enclosed space.
Compared with the prior art, the heat control method of the ground source heat pump has the following technical effects:
The invention designs a heat control method of a ground source heat pump, analyzes influence factors of indoor heat change, and establishes a ground source heat pump operation model considering indoor heat control based on the influence factors. The model can effectively keep the indoor temperature of each user in a comfortable interval through heat management, and the ground source heat pump device can control the ground source heat pump device to continue working or stop working by comparing the indoor temperature with the upper limit value and the lower limit value of the preset comfortable temperature interval. In addition, the user can adjust comfortable temperature intervals in different time intervals, so that the effects of less electricity consumption in electricity consumption peaks and multiple electricity consumption in electricity consumption valleys are achieved, the electricity consumption cost can be saved, the voltage consumption of cities or factories can be effectively relieved, and meanwhile, the consumption of energy sources and the emission of air pollutants can be greatly reduced. The invention also researches the heat exchange process of the underground system of the ground source heat pump in detail, constructs an indoor comfort model and an underground heat exchanger model, and is helpful for understanding the working mechanism of the ground source heat pump.
Drawings
Fig. 1 is a flow chart of the method of the present invention.
Detailed Description
For a better understanding of the technical content of the present invention, specific examples are set forth below, along with the accompanying drawings.
Aspects of the invention are described herein with reference to the drawings, in which there are shown many illustrative embodiments. The embodiments of the present invention are not limited to the embodiments described in the drawings. It is to be understood that this invention is capable of being carried out by any of the various concepts and embodiments described above and as such described in detail below, since the disclosed concepts and embodiments are not limited to any implementation. Additionally, some aspects of the disclosure may be used alone or in any suitable combination with other aspects of the disclosure.
As shown in fig. 1, the invention provides a heat control method of a ground source heat pump, which is based on a preset indoor comfortable temperature model and a ground heat exchanger model, and the implementation process of solving the model to obtain a final result is as follows:
S1, measuring an initial temperature T 0 in a closed space, and enabling the initial temperature T 0 to be in a preset comfortable temperature interval Comparison, if/>S2-1, refrigerating the closed space by a ground source heat pump device; if T 0 is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
In this embodiment, a comfortable temperature range of the closed range is set according to the actual requirement of the user
S2-1, starting refrigeration work of the ground source heat pump device, cooling the antifreeze in the ground source heat pump device when flowing through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump device, calculating the temperature change of the antifreeze in the U-shaped pipeline of the underground heat exchanger based on a preset underground heat exchanger model, and further calculating the heat output by the ground source heat pump device when the closed space is in refrigeration operationThen enter step S3;
S2-2, starting heating work of the ground source heat pump device, heating antifreeze in the ground source heat pump device when flowing through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump device, calculating temperature change of the antifreeze in the U-shaped pipeline of the underground heat exchanger based on a preset underground heat exchanger model, and further calculating heat output by the ground source heat pump device when the ground source heat pump device heats a closed space Then enter step S3;
in this embodiment, the amount of heat output from the ground source heat pump device to the enclosed space Or/>The calculation is carried out according to the following underground heat exchanger model:
wherein: heat output to the closed space during heating operation of the ground source heat pump device The heat output by the ground source heat pump device to the closed space during refrigeration operation is T t in which is the temperature of the antifreeze injected into the U-shaped pipe of the underground heat exchanger; t t out is the temperature of the antifreeze fluid flowing out of the U-shaped pipe of the underground heat exchanger; c f is the specific heat capacity of the antifreeze; m f is the mass flow rate of the antifreeze.
The temperature T t in、Tt out of the antifreeze solution injected into and discharged from the U-shaped pipe of the underground heat exchanger is determined by the underground heat exchange process of the ground source heat pump device, and the U-shaped pipe of the underground heat exchanger is divided into 50 sections for useRespectively representing temperature nodes of downward and upward flowing liquid in U-shaped pipes of the jth section of the underground heat exchanger at the moment t; /(I)Respectively representing temperature nodes of grouting areas beside U-shaped pipes of the jth section of the underground heat exchanger at the moment t; /(I)The outer earth temperature node of the U-shaped pipe of the j-th section of the underground heat exchanger at the moment t; based on the temperature transfer relationship between the temperature nodes in the same section of the cross-sectional plane and the temperature transfer relationship in the longitudinal direction. The temperature of the antifreeze injected into and discharged from the U-shaped pipe can be expressed as:
Wherein: /(I) A temperature node for the first section of the antifreeze fluid flowing downwards for the U-shaped pipe of the underground heat exchanger;
Wherein: /(I) A temperature node for the first section of the antifreeze fluid flowing upwards for the U-shaped pipe of the underground heat exchanger;
the model of temperature transfer in the U-shaped pipe is as follows:
Wherein: Δx is the height of each section of the subterranean heat exchanger; v is the antifreeze flow rate in the underground heat exchanger; Δt is the time interval; hp f is the heat capacity of the antifreeze; r sx is the thermal resistance between the antifreeze and R b is the thermal resistance between the antifreeze and the grouting area;
Wherein: r bb is the thermal resistance between grouting areas; r g is the thermal resistance between the grouting area and the ground; hp b is the heat capacity of the grouting area of the underground heat exchanger;
Wherein: hp g is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the model is used for calculating the temperature T t in、Tt out of the antifreeze fluid injected and discharged into the U-shaped pipe of the underground heat exchanger at any moment.
S3, absorbing heat during refrigeration operation of the ground source heat pump deviceOr heat evolved during heating operation/>Conversion to heat input into a closed space by a ground source heat pump device/>In a refrigerating state/>Is negative and in the heating state/>Positive value, then go to step S4;
in this embodiment, the heat output by the ground source heat pump device during the cooling operation is used Or heat output during heating operation/>Conversion to heat input to room by ground source heat pump device/>The formula used is as follows:
wherein: Inputting house heat for a ground source heat pump device; z t is a variable of 0-1, Z t is 0, the heat in the closed space is reduced when the ground source heat pump device is in a refrigerating state, and Z t is 1, the heat in the closed space is increased when the ground source heat pump device is in a heating state.
S4, inputting heat of the closed space based on the ground source heat pump device according to a preset indoor comfortable temperature modelIncreased heat/>, when other appliances are operated in the roomHeat transfer from the interior to the outsideAccording to the change of the heat in the closed space, and according to the temperature T t-1 at the last moment in the closed space, the current temperature T t in the closed space is calculated, and then the step S5 is carried out;
in this embodiment, the heat increase in the enclosed space mainly depends on the heat input into the house by the ground source heat pump device, the solar radiation during the daytime, and the heat generated when other electric appliances in the enclosed space are used, and the applied formulas are as follows:
In the middle of Inputting heat for the closed space; sigma is the solar radiation incidence coefficient; /(I)Is solar radiation power; /(I)Is the self-heating quantity of the closed space;
The heat in the closed space is reduced by radiating the heat outwards through the window glass and the outer wall, and the application formula is as follows:
In the middle of Heat dissipation for the enclosed space; u W is the heat transfer coefficient of the surface of the window glass, and U E is the heat transfer coefficient of the outer wall; t t e is the outdoor ambient temperature; t t E is the temperature of the outer wall;
wherein, the expression of outer wall temperature is:
wherein Hp E is the heat capacity of the outer wall;
heat capacity Hp E, outdoor environment temperature T t e, solar radiation incidence coefficient sigma, window glass surface heat transfer coefficient U W, outer wall heat transfer coefficient U E and solar radiation power based on outer wall Enclosed space self-heating quantity/>Setting of the outer wall temperature T t E,/>The heat input and output in the enclosed space can be calculated, so that the current temperature of the enclosed space in the period of time can be calculated:
Wherein T t is the temperature of the enclosed space; hp r is the heat capacity in the enclosed space.
S5, the current temperature T t in the closed space calculated in the step S4 and the upper limit value and the lower limit value of the comfortable temperature interval are calculatedT comparison, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
S6, stopping the ground source heat pump device when the temperature of the closed space is in a preset comfortable temperature interval, measuring the temperature in the closed space at preset time intervals to obtain T t, and then entering into the step S7;
s7, if so Then return to step S6, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, the step S2-2 is entered, and the ground source heat pump device heats the enclosed space.
In this embodiment, after the ground source heat pump device is turned on, the initial temperature T 0 of the closed region is measured, and T 0 is compared with the upper and lower limits of the preset comfort temperature intervalT comparison, if/>The ground source heat pump device is not started temporarily, the actual temperature in the closed space is measured again at preset time intervals to obtain T t, and T t is compared with the upper limit value and the lower limit value of the preset comfortable temperature intervalT is compared, when T t exceeds a preset comfortable temperature interval, the ground source heat pump device starts to work, and the heat change of the closed space is monitored in real time by using the underground heat exchanger model and the indoor comfortable temperature model while working, and the real-time temperature of the closed space is calculated in real time through the heat change of the closed space and the upper limit value and the lower limit value/>, of the preset comfortable temperature intervalAnd comparing T, if the real-time temperature is not in the comfortable temperature interval, continuously operating the ground source heat pump device until the real-time temperature is restored to the comfortable temperature interval, suspending the operation of the ground source heat pump device, and entering a circulation process of measuring the actual temperature in the closed space at every preset time interval. Through the intermittent working mode, the ground source heat pump device not only greatly reduces the electricity consumption, but also can relieve the voltage force in the peak period.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (3)
1. A heat control method of a ground source heat pump is characterized in that: based on a preset indoor comfort model and an underground heat exchanger model, the temperature of the closed space is controlled to be in a preset comfort temperature range by controlling the heat in the closed space according to the following steps S1 to S6In which T is the lower limit value of the comfort temperature interval,/>Is the upper limit value of the comfortable temperature interval;
Step S1: measuring the initial temperature T 0 in the enclosed space if S2-1, refrigerating the closed space by a ground source heat pump device; if T 0 is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
Step S2-1: the method comprises the steps that the ground source heat pump device starts refrigeration work, antifreeze in the ground source heat pump device is cooled when flowing through a U-shaped pipeline of a ground heat exchanger in the ground source heat pump device, temperature change of the antifreeze in the U-shaped pipeline of the ground heat exchanger is calculated based on a preset ground heat exchanger model, and then heat output by the ground source heat pump device when the ground source heat pump device performs refrigeration operation on a closed space is calculated Then enter step S3;
step S2-2: the method comprises the steps that a ground source heat pump device starts heating work, antifreeze in the ground source heat pump device is heated when flowing through a U-shaped pipeline of a ground heat exchanger in the ground source heat pump device, temperature change of the antifreeze in the U-shaped pipeline of the ground heat exchanger is calculated based on a preset ground heat exchanger model, and then heat output by the ground source heat pump device when the ground source heat pump device heats a closed space is calculated Then enter step S3;
step S3: heat absorbed by the ground source heat pump device during refrigeration operation Or heat evolved during heating operation/>Conversion to heat input into a closed space by a ground source heat pump device/>In a refrigerating state/>Negative value, in the heating statePositive value, then go to step S4;
step S4: according to a preset indoor comfort model, heat input into a closed space based on a ground source heat pump device Increased heat/>, when other appliances are operated in the roomHeat transfer from the interior to the outsideAccording to the change of the heat in the closed space, and according to the temperature T t-1 at the last moment in the closed space, the current temperature T t in the closed space is calculated, and then the step S5 is carried out;
Step S5: the current temperature T t in the closed space calculated in the step S4 and the upper limit value and the lower limit value of the comfortable temperature interval are calculated T comparison, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device; if/>Step S6 is entered;
Step S6: the temperature of the closed space is in a preset comfortable temperature interval, the ground source heat pump device stops working, the temperature in the closed space is measured at preset time intervals to obtain T t, and then step S7 is carried out;
Step S7: if it is Then return to step S6, if/>S2-1, refrigerating the closed space by the ground source heat pump device; if T t is less than T, entering a step S2-2, and heating the closed space by the ground source heat pump device;
In the steps S2-1 and S2-2, based on the temperature change of the antifreeze in the ground source heat pump device when flowing through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump device, the heat quantity output by the ground source heat pump device to the closed space is calculated according to the following underground heat exchanger model Or/>
Wherein: heat output to the closed space during heating operation of the ground source heat pump device The heat output by the ground source heat pump device to the closed space during refrigeration operation is T t in which is the temperature of the antifreeze injected into the U-shaped pipe of the underground heat exchanger; t t out is the temperature of the antifreeze fluid flowing out of the U-shaped pipeline of the underground heat exchanger; c f is the specific heat capacity of the antifreeze; m f is the mass flow rate of the antifreeze;
The temperature T t in、Tt out of the antifreeze fluid injected and discharged by the U-shaped pipe of the underground heat exchanger is determined by the underground heat exchange process of the ground source heat pump device, the U-shaped pipe of the underground heat exchanger is divided into 50 sections, and the antifreeze fluid is used for Respectively representing temperature nodes of downward and upward flowing liquid in U-shaped pipelines of the jth section of the underground heat exchanger at the moment t; /(I)Respectively representing temperature nodes of grouting areas beside U-shaped pipelines of the jth section of the underground heat exchanger at the moment t; /(I)The outer earth temperature node of the U-shaped pipeline of the jth section of the underground heat exchanger at the t moment; based on the temperature transfer relationship between the temperature nodes in the same section of the cross-section plane and the temperature transfer relationship in the longitudinal direction, the temperature of the antifreeze injected into and flowing out of the U-shaped pipeline can be expressed as:
Wherein: /(I) A temperature node for the first section of the antifreeze fluid flowing downwards in the U-shaped pipeline of the underground heat exchanger;
Wherein: /(I) A temperature node for the first section of the anti-freezing liquid flowing upwards in the U-shaped pipeline of the underground heat exchanger;
the model of temperature transfer in the U-shaped pipeline is as follows:
Wherein: Δx is the height of each section of the subterranean heat exchanger; v is the antifreeze flow rate in the underground heat exchanger; Δt is the time interval; hp f is the heat capacity of the antifreeze; r sx is the thermal resistance between the antifreeze and R b is the thermal resistance between the antifreeze and the grouting area;
Wherein: r bb is the thermal resistance between grouting areas; r g is the thermal resistance between the grouting area and the ground; hp b is the heat capacity of the grouting area of the underground heat exchanger;
Wherein: hp g is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the model is used for calculating the temperature T t in、Tt out of the antifreeze fluid injected and discharged into the U-shaped pipe of the underground heat exchanger at any moment.
2. The heat control method of a ground source heat pump according to claim 1, characterized by: in the step S3, the heat output by the ground source heat pump device during the refrigeration operation is outputOr heat output during heating operation/>Conversion to heat input to room by ground source heat pump device/>The formula used is as follows:
wherein: Inputting house heat for a ground source heat pump device; z t is a variable of 0-1, Z t is 0, the heat in the closed space is reduced when the ground source heat pump device is in a refrigerating state, and Z t is 1, the heat in the closed space is increased when the ground source heat pump device is in a heating state.
3. The heat control method of a ground source heat pump according to claim 1, characterized by: the indoor comfort model calculates the change of the temperature in the closed space by calculating the heat input and output in the closed space, the heat increase in the closed space mainly depends on the heat input by the ground source heat pump device into a house, the solar radiation in the daytime and the heat generated by other electric appliances in the closed space, the heat decrease in the closed space is the heat emitted outwards through window glass and an outer wall, and the application formula is as follows:
In the middle of Inputting heat for the closed space; sigma is the solar radiation incidence coefficient; /(I)Is solar radiation power; /(I)Is the self-heating quantity of the closed space;
In the middle of Heat dissipation for the enclosed space; u W is the heat transfer coefficient of the surface of the window glass, and U E is the heat transfer coefficient of the outer wall; t t e is the outdoor ambient temperature; t t E is the temperature of the outer wall;
wherein, the expression of outer wall temperature is:
wherein Hp E is the heat capacity of the outer wall;
heat capacity Hp E, outdoor environment temperature T t e, solar radiation incidence coefficient sigma, window glass surface heat transfer coefficient U W, outer wall heat transfer coefficient U E and solar radiation power based on outer wall Enclosed space self-heating quantity/>The external wall temperature T t E、Qt GSHP can calculate the heat input and output in the closed space, thereby calculating the current temperature of the closed space in the period:
Wherein T t is the temperature of the enclosed space; hp r is the heat capacity in the enclosed space.
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