CN115451618A - Heat control method of ground source heat pump - Google Patents
Heat control method of ground source heat pump Download PDFInfo
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- CN115451618A CN115451618A CN202211083670.5A CN202211083670A CN115451618A CN 115451618 A CN115451618 A CN 115451618A CN 202211083670 A CN202211083670 A CN 202211083670A CN 115451618 A CN115451618 A CN 115451618A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 25
- 238000007710 freezing Methods 0.000 claims abstract description 8
- 230000002528 anti-freeze Effects 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 38
- 238000012546 transfer Methods 0.000 claims description 21
- 230000005855 radiation Effects 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 239000005357 flat glass Substances 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000809 air pollutant Substances 0.000 abstract description 2
- 231100001243 air pollutant Toxicity 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 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
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- 239000003345 natural gas Substances 0.000 description 1
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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
Abstract
The invention provides a heat control method of a ground source heat pump, which comprises the following steps of firstly, constructing an underground heat exchanger model according to the temperature change of an anti-freezing solution flowing through an underground heat exchanger U-shaped pipeline in the ground source heat pump device when the ground source heat pump device works; secondly, an indoor comfortable temperature model is constructed 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 is started to work; and when the temperature of the closed space is within the comfortable temperature range, the ground source heat pump device stops working. Therefore, the intermittent operation mode can effectively relieve the electricity utilization pressure of a city or a factory, and can greatly reduce the consumption of energy 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 deal with the increasing climate problem, the vigorous development of distributed renewable energy has become the development direction of the future power system, and the energy problem is now prominent due to various reasons such as severe international situation. While a considerable portion of the energy consumed is used for space heating and cooling, in this respect, conventional natural gas heating and electric air conditioning are widely used, but they consume a lot of energy and also increase the emission of greenhouse gases. Therefore, more efficient and environmentally friendly equipment is needed to heat/cool residential and commercial users, and the ground source heat pump system is highlighted. Because the ground source heat pump takes the earth surface and the underground soil as energy supply, the temperature of the underground soil is basically kept constant all year round, and is higher than the environmental temperature in winter, heat can be supplied to the indoor space through the indoor and outdoor high temperature difference; the indoor heat dissipation is realized through indoor and outdoor high temperature difference when the temperature is lower than the environmental temperature in summer, 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 cooling 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 of the ground source heat pump system is low in pollution, and if the ground source heat pump system is used for replacing heating 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 indoor temperature of the ground source heat pump system and the working principle of the ground source heat pump system in detail, so that a ground source heat pump operation method considering indoor temperature control is urgently needed to be studied.
Disclosure of Invention
The invention aims to: based on the preset indoor comfortable model and the underground heat exchanger model, the temperature of the closed space is controlled within the preset comfortable temperature range by controlling the heat in the closed space.
In order to achieve the purpose, the invention provides the following technical scheme:
the scheme provides a heat control method of a ground source heat pump, which is based on a preset indoor comfortable model and an underground heat exchanger model, and realizes the control of the temperature of a closed space in a preset comfortable temperature interval by controlling the heat in the closed space according to the following steps S1 to S6
Therein, whereinTWherein the lower limit value of the comfortable 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 in an enclosed space 0 If, if
Step S2-1, refrigerating the closed space by the ground source heat pump device; if T is 0 ＜TStep S2-2 is entered, the ground source heat pump device heats the closed space; if it is
Step S6 is entered;
step S2-1: starting the refrigeration work by 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 refrigerating the enclosed space
Then, the step S3 is carried out;
step S2-2: starting heating work by a ground source heat pump device, heating antifreeze in the ground source heat pump device when flowing through an underground heat exchanger U-shaped pipeline in the ground source heat pump device, and calculating the antifreeze on the basis of a preset underground heat exchanger modelThe temperature change in the U-shaped pipe of the underground heat exchanger is described, and then the heat output by the ground source heat pump device when the ground source heat pump device heats the closed space is calculated
Then, the step S3 is carried out;
and step S3: absorbing heat when the ground source heat pump device is in refrigeration operation
Or heat released during heating operation
Converted into heat input into a closed space by a ground source heat pump device
In the cooling state
Is negative, in the heating state
If the value is positive, then the step S4 is carried out;
and step S4: inputting heat of a closed space based on a ground source heat pump device according to a preset indoor comfortable temperature model
Increased heat when other indoor electric appliances work
Heat from indoor to outside
Calculating the change of the temperature in the enclosed space according to the change of the heat in the enclosed space, and calculating the change of the temperature in the enclosed space according to the temperature T at the previous moment in the enclosed space t-1 Calculating the current temperature T in the enclosed space t Then, go to step S5;
step S5: calculating the current temperature T in the closed space calculated in the step S4 t Upper and lower limit values of comfortable temperature range
TIn comparison, if
Step S2-1 is entered, the ground source heat pump device refrigerates the closed space; if T is t ＜TStep S2-2 is carried out, the ground source heat pump device heats the closed space; if it is
Step S6 is entered;
step S6: when the temperature of the closed space is within a preset comfortable temperature range, the ground source heat pump device stops working, and the temperature in the closed space is measured at a preset time interval to obtain T t Then, the process proceeds to step S7;
step S7: if it is
Then the process returns to step S6, if
Step S2-1 is entered, the ground source heat pump device refrigerates the closed space; if T t ＜TAnd S2-2, heating the closed space by the ground source heat pump device.
As a preferred technical solution, in the steps S2-1 and S2-2, based on the temperature change of the anti-freezing solution 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 magnitude of the heat output by the ground source heat pump device to the enclosed space is calculated according to the following underground heat exchanger model
Or
In the formula:
is the heat output to the closed space by the ground source heat pump device during the heating operation,
the heat quantity T output to the closed space when the ground source heat pump device operates in refrigeration t in The temperature of the antifreeze liquid injected into the U-shaped pipe of the underground heat exchanger; t is t out The temperature of the antifreeze flowing out of the U-shaped pipe of the underground heat exchanger; c. C f The specific heat capacity of the antifreeze solution; m is f Is the mass flow rate of the antifreeze.
As a preferred technical scheme, the temperature T of the antifreeze liquid injected and flowed out of the U-shaped pipe of the underground heat exchanger t in 、T t out The underground heat exchanger U-shaped pipe is divided into 50 sections according to the underground heat exchange process of the ground source heat pump device
Respectively representing temperature nodes of liquid flowing downwards and upwards in the J-th section of underground heat exchanger U-shaped pipe at the moment t;
respectively representing temperature nodes of grouting areas beside the J-th section of underground heat exchanger U-shaped pipe at the moment t;
the earth temperature node outside the U-shaped pipe of the j section underground heat exchanger at the time t; based on each temperature sectionThe temperature transfer relationship between points in the same cross-sectional plane, and the temperature transfer relationship in the longitudinal direction. The antifreeze temperature injected into and flowing out of the U-shaped pipe can be expressed as:
the model of temperature transfer in the U-shaped tube is as follows:
in the formula: Δ x is the height of each section of the underground heat exchanger; v is the antifreeze flow rate in the underground heat exchanger; Δ t is the time interval; hp f The heat capacity of the antifreeze solution; r is sx Is the thermal resistance, R, between the antifreeze solutions b Is the thermal resistance between the antifreeze and the grouting area;
in the formula: r bb Thermal resistance between grouting areas; r g Is the thermal resistance between the grouting area and the ground bottom; hp b Heat capacity of a grouting area of the underground heat exchanger;
in the formula: hp g Is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the temperature T of the antifreeze injected and flowed into and out of the U-shaped pipe of the underground heat exchanger at any moment can be calculated by using the model t in 、T t out 。
In the step S3, the heat output by the ground source heat pump device during the refrigerating operation is converted into the heat
Or heat output during heating operation
Converted into heat input into room by ground source heat pump device
The formula used is as follows:
in the formula:
inputting the heat of the house for the ground source heat pump device; z t Is a variable of 0 to 1, Z t When the heat pump is 0, the ground source heat pump device is in a refrigerating state, the heat in the closed space is reduced, and Z t When the heat quantity is 1, the heat quantity in the closed space is increased when the ground source heat pump device is in a heating state.
As a preferred technical solution, the indoor comfortable temperature model calculates the input and output heat in the enclosed space to calculate the change of the temperature in the enclosed space in this time period, the increase of the heat in the enclosed space mainly depends on the heat input to the house by the ground source heat pump device, the solar radiation in the daytime and the heat generated by other electrical appliances in the enclosed space during use, the decrease of the heat in the enclosed space is the heat dissipated outwards through the window glass and the outer wall, and the applied formula is as follows:
in the formula
Inputting heat for the enclosed space; sigma is the solar radiation incidence coefficient;
is the solar radiation power;
self-heating quantity of the closed space;
in the formula
Heat is dissipated from the closed space; u shape W For the heat transfer coefficient of the window glass surface, U E The heat transfer coefficient of the outer wall; t is a unit of t e Is the outdoor ambient temperature; t is t E The temperature of the outer wall;
wherein, the expression of the outer wall temperature is as follows:
hp in the formula E Is the heat capacity of the outer wall;
heat capacity Hp based on outer wall E Outdoor ambient temperature T t e Solar radiation incidence coefficient sigma and window glass surface heat transfer coefficient U W And outer wall heat transfer coefficient U E Solar radiation power
Self-heating quantity of enclosed space
Setting of (1), outer wall temperature T t E 、
The heat input and output in the closed space can be calculated, so that the current temperature of the closed space in the period is calculated and obtained:
in the formula 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 by adopting the technical scheme:
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. Besides, the user can also adjust the comfortable temperature interval of different periods, reaches the effect of using electricity less when the power consumption peak, the power consumption is used more when the power consumption low ebb, can not only save the power consumption cost, can effectually alleviate city or mill's power consumption pressure moreover, simultaneously can also the consumption of the greatly reduced energy and the emission of air pollutant. The invention also researches the heat exchange process of the underground system of the ground source heat pump in detail, constructs an indoor comfortable 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
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
Aspects of the invention are described herein with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the invention are not limited to those illustrated in the drawings. It is to be understood that the invention is capable of implementation in any of the numerous concepts and embodiments described above and described in detail below, since the disclosed concepts and embodiments are not limited to any particular implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
As shown in fig. 1, the invention provides a heat control method of a ground source heat pump, based on a preset indoor comfortable temperature model and an underground heat exchanger model, solving the model to obtain a final result, and the implementation process is as follows:
step S1, measuring initial temperature T in closed space 0 Initial temperature T 0 And a preset comfortable temperature interval
In comparison, if
Step S2-1, refrigerating the closed space by the ground source heat pump device; if T is 0 ＜TStep S2-2 is entered, the ground source heat pump device heats the closed space; if it is
Then go to stepStep S6;
in this embodiment, the comfortable temperature interval of the closed area is set according to the actual requirement of the user
S2-1, starting the refrigeration work by 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 refrigerating the closed space
Then, the step S3 is carried out;
step S2-2, starting heating work by the ground source heat pump device, heating antifreeze in the ground source heat pump device when flowing through an underground heat exchanger U-shaped pipeline in the ground source heat pump device, calculating temperature change of the antifreeze in the underground heat exchanger U-shaped pipeline based on a preset underground heat exchanger model, and further calculating heat output by the ground source heat pump device when heating the closed space
Then, the step S3 is carried out;
in this embodiment, the magnitude of the heat output from the ground source heat pump device to the enclosed space
Or
Calculated as follows for the subsurface heat exchanger model:
in the formula:
is the heat output to the closed space by the ground source heat pump device during the heating operation,
the heat quantity T output to the closed space when the ground source heat pump device operates in refrigeration t in The temperature of the antifreeze injected into the U-shaped pipe of the underground heat exchanger; t is a unit of t out The temperature of the antifreeze flowing out of the U-shaped pipe of the underground heat exchanger; c. C f The specific heat capacity of the antifreeze solution; m is f Is the mass flow rate of the antifreeze.
The temperature T of the antifreeze injected and flowed into and out of the U-shaped pipe of the underground heat exchanger t in 、T t out The underground heat exchanger U-shaped pipe is divided into 50 sections according to the underground heat exchange process of the ground source heat pump device
Respectively representing temperature nodes of liquid flowing downwards and upwards in the U-shaped pipe of the j section underground heat exchanger at the moment t;
respectively representing temperature nodes of grouting areas beside the J-th section of underground heat exchanger U-shaped pipe at the moment t;
an earth temperature node outside 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 section plane and the temperature transfer relationship in the longitudinal direction. The antifreeze temperature injected into and flowing out of the U-shaped pipe can be expressed as:
the model of temperature transfer in the U-shaped tube is as follows:
in the formula: Δ x is the height of each section of the underground heat exchanger; v is the antifreeze flow rate in the underground heat exchanger; Δ t is the time interval; hp f The heat capacity of the antifreeze solution; r sx Is the thermal resistance, R, between the antifreeze solutions b Is the thermal resistance between the antifreeze and the grouting area;
in the formula: r bb Thermal resistance between grouting areas; r g Is the thermal resistance between the grouting area and the ground bottom; hp b Heat capacity of a grouting area of the underground heat exchanger;
in the formula: hp g Is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the temperature T of the antifreeze injected and flowed into and out of the U-shaped pipe of the underground heat exchanger at any moment can be calculated by using the model t in 、T t out 。
S3, absorbing heat when the ground source heat pump device is in refrigerating operation
Or heat released during heating operation
Converted into heat input into a closed space by a ground source heat pump device
In the cooling state
Is negative, in the heating state
If the value is positive, then the step S4 is carried out;
in this embodiment, the heat output by the ground source heat pump device during cooling operation
Or heat output during heating operation
Converted into heat input into room by ground source heat pump device
The formula used is as follows:
in the formula:
inputting the heat of the house for the ground source heat pump device; z t Is a variable of 0 to 1, Z t When the heat pump is 0, the ground source heat pump device is in a refrigerating state, the heat in the closed space is reduced, and Z t When the heat quantity is 1, the heat quantity 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 model
Increased heat when other indoor electric appliances work
Heat from indoor to outside
Calculating the change of the temperature in the enclosed space according to the change of the heat in the enclosed space, and calculating the change of the temperature in the enclosed space according to the temperature T at the previous moment in the enclosed space t-1 Calculating the current temperature T in the enclosed space t Then, go to step S5;
in this embodiment, the increase of the heat in the enclosed space mainly depends on the heat input to the house by the ground source heat pump device, the solar radiation in the daytime, and the heat generated by other electrical appliances in the enclosed space, and the applied formula is as follows:
in the formula
Inputting heat for the enclosed space; sigma is the solar radiation incidence coefficient;
is the solar radiation power;
self-heating of the enclosed space;
the heat in the closed space is reduced by radiating heat outwards through the window glass and the outer wall, and the applied formula is as follows:
in the formula
Heat is dissipated from the closed space; u shape W For the heat transfer coefficient of the window glass surface, U E The heat transfer coefficient of the outer wall; t is t e Is the outdoor ambient temperature; t is t E The temperature of the outer wall;
wherein, the expression of the outer wall temperature is as follows:
hp in the formula E Is the heat capacity of the outer wall;
heat capacity Hp based on outer wall E Outdoor ambient temperature T t e Solar radiation incidence coefficient sigma and window glass surface heat transfer coefficient U W Outer wall heat transfer coefficient U E Solar radiation power
Self-heating quantity of enclosed space
Setting of (1), outer wall temperature T t E 、
Can calculateThe heat input and output in the closed space, and the current temperature of the closed space in the period is calculated and obtained as follows:
in the formula T t Is the temperature of the enclosed space; hp r Is the heat capacity in the enclosed space.
S5, calculating the current temperature T in the closed space calculated in the step S4 t Upper and lower limit values of comfortable temperature range
TIn comparison, if
Entering the step S2-1, refrigerating the closed space by the ground source heat pump device; if T is t ＜TStep S2-2 is carried out, the ground source heat pump device heats the closed space; if it is
Step S6 is entered;
s6, if the temperature of the closed space is within a preset comfortable temperature range, stopping the operation of the ground source heat pump device, and measuring the temperature in the closed space at a preset time interval to obtain T t Then, the process proceeds to step S7;
step S7, if
Then the process returns to step S6, if
Step S2-1 is entered, the ground source heat pump device refrigerates the closed space; if T t ＜TAnd S2-2, heating the closed space by the ground source heat pump device.
In this embodiment, after the ground source heat pump device is turned on, the initial temperature T of the enclosed area is measured first 0 Will T 0 Upper and lower limit values of preset comfortable temperature interval
TIn comparison, if
The ground source heat pump device is not started temporarily, and the actual temperature in the closed space is measured again at preset time intervals to obtain T t Will T t Upper and lower limit values of preset comfortable temperature interval
TComparison until T t When the temperature exceeds the preset comfortable temperature interval, the ground source heat pump device starts to work, the underground heat exchanger model and the indoor comfortable temperature model are used for monitoring the heat change of the closed space in real time while working, 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 interval
TAnd comparing, 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 recovered to the comfortable temperature interval, suspending the operation of the ground source heat pump device, and entering a cycle process of measuring the actual temperature in the closed space at preset time intervals. The ground source heat pump device not only greatly reduces the power consumption, but also can relieve the power consumption pressure in the peak period through the intermittent working mode.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be defined by the appended claims.
Claims (5)
1. A heat control method of a ground source heat pump is characterized by comprising the following steps: based on presettingsThe indoor comfortable model and the underground heat exchanger model are controlled according to the following steps from S1 to S6, and the temperature of the closed space is controlled within a preset comfortable temperature range by controlling the heat in the closed space
Therein is shown inTWherein the lower limit value of the comfortable temperature interval,
is the upper limit value of a comfortable temperature interval;
step S1: measuring initial temperature T in enclosed space 0 If, if
Step S2-1, refrigerating the closed space by the ground source heat pump device; if T 0 ＜TStep S2-2 is entered, the ground source heat pump device heats the closed space; if it is
Step S6 is entered;
step S2-1: starting the refrigeration work of the ground source heat pump device, cooling the anti-freezing solution in the ground source heat pump device when the anti-freezing solution flows through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump device, calculating the temperature change of the anti-freezing solution 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 ground source heat pump device refrigerates the enclosed space
Then, the step S3 is carried out;
step S2-2: starting a heating work by a ground source heat pump device, heating antifreeze in the ground source heat pump device when flowing through an underground heat exchanger U-shaped pipeline in the ground source heat pump device, calculating the temperature change of the antifreeze in the underground heat exchanger U-shaped pipeline based on a preset underground heat exchanger model, and further calculating the output of the ground source heat pump device when heating a closed spaceHeat of
Then, the step S3 is carried out;
and step S3: the heat absorbed by the ground source heat pump device during the refrigeration operation
Or heat released during heating operation
Converted into heat input into the closed space by the ground source heat pump device
In the cooling state
Negative value, in the heating state
If the value is positive, then the step S4 is carried out;
and step S4: inputting heat of a closed space based on a ground source heat pump device according to a preset indoor comfortable temperature model
Increased heat generated by other indoor electric appliances during working
Heat from indoor to outside
Calculating the change of the temperature in the enclosed space according to the change of the heat in the enclosed space, and calculating the change of the temperature in the enclosed space according to the temperature T at the previous moment in the enclosed space t-1 Calculating the current temperature T in the enclosed space t Then, go to step S5;
step S5: calculating the current temperature T in the closed space calculated in the step S4 t Upper and lower limit values of comfortable temperature range
TIn comparison, if
Entering the step S2-1, refrigerating the closed space by the ground source heat pump device; if T t ＜TStep S2-2 is entered, the ground source heat pump device heats the closed space; if it is
Step S6 is entered;
step S6: when the temperature of the closed space is in a preset comfortable temperature range, the ground source heat pump device stops working, and the temperature in the closed space is measured at a preset time interval to obtain T t Then, the process proceeds to step S7;
step S7: if it is
Then the process returns to step S6, if
Step S2-1 is entered, the ground source heat pump device refrigerates the closed space; if T t ＜TAnd S2-2, heating the closed space by the ground source heat pump device.
2. A heat control method of a ground source heat pump is characterized by comprising the following steps: in the steps S2-1 and S2-2, based on the temperature change of the antifreeze solution in the ground source heat pump device when the antifreeze solution flows through the U-shaped pipeline of the underground heat exchanger in the ground source heat pump device, the heat output from the ground source heat pump device to the closed space is calculated according to the following underground heat exchanger model
Or
In the formula:
is the heat output to the closed space by the ground source heat pump device during the heating operation,
the heat quantity T output to the closed space when the ground source heat pump device operates in refrigeration t in The temperature of the antifreeze injected into the U-shaped pipe of the underground heat exchanger; t is t out The temperature of the antifreeze flowing out of the U-shaped pipe of the underground heat exchanger; c. C f The specific heat capacity of the antifreeze solution; m is f Is the mass flow rate of the antifreeze.
3. A heat control method of a ground source heat pump is characterized by comprising the following steps: temperature T of antifreeze injected and flowed into and out of U-shaped pipe of underground heat exchanger t in 、T t out The underground heat exchanger U-shaped pipe is divided into 50 sections according to the underground heat exchange process of the ground source heat pump device
Respectively representing temperature nodes of liquid flowing downwards and upwards in the J-th section of underground heat exchanger U-shaped pipe at the moment t;
respectively representing temperature nodes of grouting areas beside the J-th section of underground heat exchanger U-shaped pipe at the moment t;
an earth temperature node outside 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 section plane and the temperature transfer relationship in the longitudinal direction. The antifreeze temperature injected into and flowing out of the U-shaped pipe can be expressed as:
the model of temperature transfer in the U-shaped tube is as follows:
in the formula: Δ x is the height of each section of the underground heat exchanger(ii) a v is the antifreeze flow rate in the underground heat exchanger; Δ t is the time interval; hp f The heat capacity of the antifreeze solution; r is sx Is the thermal resistance, R, between the antifreeze solutions b Is the thermal resistance between the antifreeze and the grouting area;
in the formula: r is bb Thermal resistance between grouting areas; r g Is the thermal resistance between the grouting area and the ground bottom; hp b Heat capacity of a grouting area of the underground heat exchanger;
in the formula: hp g Is the underground heat capacity;
the initial temperature value of each node in the model is a set value, and the temperature T of the antifreeze injected and discharged by the U-shaped pipe of the underground heat exchanger at any moment can be calculated by using the model t in 、T t out 。
4. A heat control method of a ground source heat pump is characterized by comprising the following steps: in the step S3, the heat output by the ground source heat pump device during the refrigeration operation is converted into the heat
Or heat output during heating operation
Converted into heat input into room by ground source heat pump device
The formula used is as follows:
in the formula:
inputting the heat of the house for the ground source heat pump device; z t Is a variable of 0 to 1, Z t When the heat pump is 0, the ground source heat pump device is in a refrigerating state, the heat in the closed space is reduced, and Z t When the heat quantity is 1, the heat quantity in the closed space is increased when the ground source heat pump device is in a heating state.
5. A heat control method of a ground source heat pump is characterized by comprising the following steps: the indoor comfortable temperature model calculates the heat input and output in the closed space, so as to calculate the change of the temperature in the closed space in the period, the heat increase in the closed space mainly depends on the heat input into the house by the ground source heat pump device, the solar radiation in the daytime and the heat generated when other electric appliances in the closed space are used, the heat reduction in the closed space is the heat emitted outwards through the window glass and the outer wall, and the applied formula is as follows:
in the formula
Inputting heat for the enclosed space; sigma is solar radiation incidence coefficient;
is the solar radiation power;
self-heating quantity of the closed space;
in the formula
Heat is dissipated from the closed space; u shape W For the heat transfer coefficient of the window glass surface, U E The heat transfer coefficient of the outer wall; t is a unit of t e Is the outdoor ambient temperature; t is a unit of t E The temperature of the outer wall;
wherein, the expression of the outer wall temperature is as follows:
hp in the formula E Is the heat capacity of the outer wall;
heat capacity Hp based on outer wall E Outdoor ambient temperature T t e Solar radiation incidence coefficient sigma and window glass surface heat transfer coefficient U W Outer wall heat transfer coefficient U E Solar radiation power
Self-heating quantity of enclosed space
Setting of (1), outer wall temperature T t E 、
The heat input and output in the closed space can be calculated, so that the current temperature of the closed space in the period is calculated and obtained:
in the formula T t Is the temperature of the enclosed space; hp r Is the heat capacity in the enclosed space.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122114A2 (en) * | 2007-04-04 | 2008-10-16 | Bardsley James E | Coaxial borehole energy exchange system for storing and extracting underground cold |
| CN106225268A (en) * | 2016-07-18 | 2016-12-14 | 河海大学 | A kind of CCHP bored concrete pile device and construction method thereof |
| WO2018014608A1 (en) * | 2016-07-18 | 2018-01-25 | 河海大学 | Novel steel-tube energy-pile for improving utilization efficiency of shallow geothermal energy, and manufacturing method therefor |
| CN112229870A (en) * | 2020-11-04 | 2021-01-15 | 安徽理工大学 | Controllable multi-factor ground source heat pump test platform and method thereof |
| CN114992731A (en) * | 2022-05-12 | 2022-09-02 | 江苏大学 | System for realizing building refrigeration by only utilizing geothermal energy and air energy and control method |
-
2022
- 2022-09-06 CN CN202211083670.5A patent/CN115451618A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122114A2 (en) * | 2007-04-04 | 2008-10-16 | Bardsley James E | Coaxial borehole energy exchange system for storing and extracting underground cold |
| CN106225268A (en) * | 2016-07-18 | 2016-12-14 | 河海大学 | A kind of CCHP bored concrete pile device and construction method thereof |
| WO2018014608A1 (en) * | 2016-07-18 | 2018-01-25 | 河海大学 | Novel steel-tube energy-pile for improving utilization efficiency of shallow geothermal energy, and manufacturing method therefor |
| CN112229870A (en) * | 2020-11-04 | 2021-01-15 | 安徽理工大学 | Controllable multi-factor ground source heat pump test platform and method thereof |
| CN114992731A (en) * | 2022-05-12 | 2022-09-02 | 江苏大学 | System for realizing building refrigeration by only utilizing geothermal energy and air energy and control method |
Non-Patent Citations (1)
| Title |
|---|
| 叶菁菁;胡海涛;丁国良;EIKEVIK TRYGVE MAGNE;: "太阳能辅助二氧化碳地源热泵系统的性能分析", 制冷技术, no. 01, 15 February 2016 (2016-02-15) * |
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