CN105937823B - A kind of earth source heat pump control method and system - Google Patents
A kind of earth source heat pump control method and system Download PDFInfo
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- CN105937823B CN105937823B CN201610200872.1A CN201610200872A CN105937823B CN 105937823 B CN105937823 B CN 105937823B CN 201610200872 A CN201610200872 A CN 201610200872A CN 105937823 B CN105937823 B CN 105937823B
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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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Abstract
The present invention relates to a kind of earth source heat pump control method and systems.The earth source heat pump control method includes: to obtain the greenhouse temperature value of the historical juncture of multiple preset time periods；The predicted value of greenhouse temperature is obtained according to the greenhouse temperature value of the multiple historical juncture and greenhouse temperature grey forecasting model；The frequency controlling value of the earth source heat pump is obtained according to the predicted value of the greenhouse temperature and given temperature；The frequency of the earth source heat pump is adjusted according to the frequency controlling value.Earth source heat pump control method and system provided by the invention, the a part for replacing real-time temperature values to input as controller using the predicted value of greenhouse temperature, realize Prior Control, earth source heat pump start-stop time and control valve flow, which are controlled, with traditional oepration at full load is lost to realize temperature control in greenhouse compared to reducing unit, gray prediction has preferably been fitted greenhouse temperature variation tendency, has saved the energy.
Description
Technical field
The present invention relates to frequency conversion control technique field more particularly to a kind of earth source heat pump control methods and system.
Background technique
Ground-source heat pump system utilizes clean renewable energy, and no pollution to the environment, and energy-efficient belongs to green ring
Protect technology and equipment.The experimental results showed that ground source heat pump control system saves 2/3 or more electric energy than grill pan stove heating, than
Fuel boiler saves about 1/2 energy；The refrigeration of earth source heat pump, heating efficiency are up to 3.5~4.4, with traditional air source heat pump
It compares, is higher by 40% or so, and operating cost is the 50%~60% of ordinary central air-conditioner.In current ground-source heat pump system
In, many designs are simultaneously not reasonable, do not have variable working condition regulatory function, cause to be constantly in the state of operating at full capacity, waste of energy.
There are two main classes for existing earth source heat pump control method: the first kind according to different workload demands by control valve come
Carry out the control of flow, temperature etc..But that there are starting currents is big for this control mode, mechanical shock is big, electic protection characteristic is poor
The disadvantages of.Second class carries out frequency control by PID to heat pump, there are also introducing fuzzy rule to improve PID, using fuzzy
Rules modification PID coefficient；Or introduce genetic algorithm, neural network etc. to the membership function of fuzzy control and control rule sets into
Row improves.But the above control mode belongs to subsequent control, and the control amount of next step is determined according to Current Temperatures and given temperature.
Due to room temperature there are big inertia and it is non-linear the features such as, above-mentioned subsequent control cannot predict future temperature variation tendency, mention
Before make control decision, cause the waste of the energy to a certain extent.
Summary of the invention
The technical problems to be solved by the present invention are: existing earth source heat pump control method mechanical shock is big, frequency control
The problem of inaccuracy.
In order to solve the above technical problems, the invention proposes following technical solutions:
A kind of earth source heat pump control method, comprising:
Obtain the greenhouse temperature value of the historical juncture of multiple preset time periods；
Greenhouse temperature is obtained according to the greenhouse temperature value of the multiple historical juncture and greenhouse temperature grey forecasting model
Predicted value；
The frequency controlling value of the earth source heat pump is obtained according to the predicted value of the greenhouse temperature and given temperature；
The frequency of the earth source heat pump is adjusted according to the frequency controlling value.
Optionally, the greenhouse temperature value of the historical juncture for obtaining multiple preset time periods includes:
The greenhouse temperature value for obtaining the historical juncture of multiple preset time periods is gone through according to equal-dimension and new-info model to the multiple
The history moment, corresponding greenhouse temperature value was updated.
Optionally, described to be obtained according to the greenhouse temperature value and greenhouse temperature grey forecasting model of the multiple historical juncture
The predicted value of greenhouse temperature includes:
The column vector of the greenhouse temperature value of the multiple historical juncture is
X0=(x(0)(1),x(0)(2),…,x(0)(n))T,n≥4；
Cumulative to the greenhouse temperature value of the multiple historical juncture
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；With linear dynamic model to X1It is fitted and approaches,
Greenhouse temperature grey forecasting model is established, the predicted value of greenhouse temperature is obtained；
Wherein, x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)It (n) is that preceding n are gone through
The accumulation result of the greenhouse temperature value at history moment,
Optionally, the predicted value and given temperature according to the greenhouse temperature obtains the frequency control of the earth source heat pump
Value processed includes:
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For system
The temperature upper limit of setting,For the temperature upper limit value of default.
A kind of ground source heat pump control system, comprising:
Greenhouse temperature value acquiring unit, the greenhouse temperature value of the historical juncture for obtaining multiple preset time periods；
Temperature prediction value acquiring unit, for the greenhouse temperature value and greenhouse temperature grey according to the multiple historical juncture
The predicted value of prediction model acquisition greenhouse temperature；
Frequency controlling value acquiring unit, for obtaining described ground source according to the predicted value and given temperature of the greenhouse temperature
The frequency controlling value of heat pump；
Frequency adjustment unit, for adjusting the frequency of the earth source heat pump according to the frequency controlling value.
Optionally, the greenhouse temperature value acquiring unit is further used for obtaining the historical juncture of multiple preset time periods
Greenhouse temperature value, corresponding greenhouse temperature value of the multiple historical juncture is updated according to equal-dimension and new-info model.
Optionally, the temperature prediction value acquiring unit, is further used for the greenhouse temperature to the multiple historical juncture
Value adds up
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；With linear dynamic model to X1It is fitted and approaches,
Greenhouse temperature grey forecasting model is established, the predicted value of greenhouse temperature is obtained；
Wherein, the column vector of the greenhouse temperature value of the multiple historical juncture is X0=(x(0)(1),x(0)(2),…,x(0)
(n))T,n≥4；x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)(n) for preceding n history
The accumulation result of the greenhouse temperature value at moment,
Optionally, the frequency controlling value acquiring unit, is further used for
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For system
The temperature upper limit of setting,For the temperature upper limit value of default.
A kind of ground source heat pump control system, comprising:
Host computer, slave computer, temperature transmitter, frequency converter and earth source heat pump；
The greenhouse temperature is sent to the slave computer for acquiring greenhouse temperature by the temperature transmitter；
The slave computer is used to the greenhouse temperature received being sent to the host computer；
The host computer is used for the greenhouse temperature value and greenhouse temperature grey of the historical juncture according to multiple preset time periods
Prediction model obtains the predicted value of greenhouse temperature, and obtains described ground source according to the predicted value of the greenhouse temperature and given temperature
The frequency controlling value of heat pump；
The frequency converter is used to adjust the frequency of the earth source heat pump according to the frequency controlling value.
Earth source heat pump control method and system provided by the invention replace real-time temperature values using the predicted value of greenhouse temperature
As controller input a part, realize Prior Control, with traditional oepration at full load control earth source heat pump start-stop time and
Control valve flow has preferably been fitted greenhouse temperature to realize temperature control in greenhouse compared to unit loss, gray prediction is reduced
Variation tendency has saved the energy.
Detailed description of the invention
The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, and attached drawing is schematically without that should manage
Solution is carries out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the flow diagram of the earth source heat pump control method of one embodiment of the invention；
Fig. 2 shows the schematic illustrations of earth source heat pump control method of the present invention；
Fig. 3 shows the structural schematic diagram of the ground source heat pump control system of one embodiment of the invention；
Fig. 4 shows the configuration diagram of the ground source heat pump control system of one embodiment of the invention；
Fig. 5 shows the interface schematic diagram of host computer in the ground source heat pump control system of one embodiment of the invention；
Fig. 6 is shown not using the working frequency of the frequency converter of earth source heat pump control method；
Fig. 7 shows the working frequency of the frequency converter of the earth source heat pump control method of one embodiment of the invention.
Specific embodiment
Below in conjunction with attached drawing, embodiments of the present invention is described in detail.
Fig. 1 shows the flow diagram of one embodiment of the invention.As shown in Figure 1, the method for the embodiment, packet
It includes:
S11: the greenhouse temperature value of the historical juncture of multiple preset time periods is obtained；
S12: greenhouse temperature is obtained according to the greenhouse temperature value of the multiple historical juncture and greenhouse temperature grey forecasting model
The predicted value of degree；
S13: the frequency controlling value of the earth source heat pump is obtained according to the predicted value of the greenhouse temperature and given temperature；
S14: the frequency of the earth source heat pump is adjusted according to the frequency controlling value.
The earth source heat pump control method of the present embodiment replaces real-time temperature values as control using the predicted value of greenhouse temperature
A part of device input, realizes Prior Control, controls earth source heat pump start-stop time and control valve with traditional oepration at full load
Flow has preferably been fitted greenhouse temperature variation and has become to realize temperature control in greenhouse compared to unit loss, gray prediction is reduced
Gesture has saved the energy.
Fig. 2 shows the schematic illustrations of earth source heat pump control method of the present invention.As shown in Fig. 2, being carried out to greenhouse temperature
X is sampled, is input in gray prediction module and establishes model, be computed rear output temperature forecasting sequenceThen with input target temperature
Spend x*It is compared, the control amount u needed, to control earth source heat pump, the x value for exporting system future is met the requirements.
In a kind of optional embodiment, the greenhouse temperature value packet of the historical juncture for obtaining multiple preset time periods
It includes:
The greenhouse temperature value for obtaining the historical juncture of multiple preset time periods is gone through according to equal-dimension and new-info model to the multiple
The history moment, corresponding greenhouse temperature value was updated.
Since research object is to continue to develop variation, although the historical information of system has certain work to research system
With, but it is more valuable to the characteristic of research system with the closer new breath (new information) of predicted time, it therefore, can constantly will be new
Breath data, which are enriched, establishes GM (1,1) model in original series.Meanwhile to avoid model from tending to huge influence system-computed amount,
While supplementing a new breath, remove an old data, keeps sequence dimension constant, GM (1, the 1) model thus established claims
GM (1,1) model is ceased for equal reforms.
For example, if the data sequence at a certain moment are as follows:
X0=(x(0)(1),x(0)(2),…,x(0)(n))T；
Then the data sequence of next sampling instant becomes:
X0=(x(0)(2),x(0)(3),…,x(0)(n+1))T。
Further, the greenhouse temperature value of the historical juncture according to the multiple preset time period and greenhouse temperature ash
Color prediction model obtain greenhouse temperature predicted value include:
The column vector of the greenhouse temperature value of the multiple historical juncture is
X0=(x(0)(1),x(0)(2),…,x(0)(n))T,n≥4；
Cumulative to the greenhouse temperature value of the multiple historical juncture
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；With linear dynamic model to X1It is fitted and approaches,
Greenhouse temperature grey forecasting model is established, the predicted value of greenhouse temperature is obtained；
Wherein, x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)It (n) is that preceding n are gone through
The accumulation result of the greenhouse temperature value at history moment,
It should be noted that claiming the inverse process of abstract system (to determine mould by the behavior of system in gray system theory
Type) it is gray model, also known as GM.Usual GM is expressed as GM (M, N) expression, and M indicates the order of model equation, the representative model side N
The number of Cheng Bianliang.In general, calculation amount is exponentially increased with the increase of M and N；But precision of prediction might not mention
It is high.
The establishment process of greenhouse temperature Grey models GM (1,1) is as follows:
If the temperature data column vector measured by sensor is
X0=(x(0)(1),x(0)(2),…,x(0)(n))T,n≥4 (1)
Subscript 0 indicates that the data are initial data in formula, and n is the serial number of initial data, and T is matrix transposition.
Accumulation process is carried out to original data sequence to obtain
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4 (2)
Wherein,
Subscript 1 indicates that one-accumulate generates to obtain.
It adds up to initial data, is for influence of the random disturbances to measured temperature signal in Weakened System.
It is fitted and is approached, form with cumulative data of the linear dynamic model to generation are as follows:
Wherein a, u are the parameter for needing to obtain by modeling.A is development coefficient, and u is grey actuating quantity.
(3) solution of formula is
T represents a certain moment in formula；T0 is initial time.
To its periodic sampling, discrete value is then
K is k-th of discrete point in formula.
Coefficient a, u of the differential equation can be found out with least square method, vector form are as follows:
Y=[x(0)(2),x(0)(3),…,x(0)(n)]T (8)
X in formula(1)(t) for by the single order cumulative data of Raw Data Generation；
It obtains
In formulaFor the single order cumulative data calculated according to the differential equation.
According toInverse accumulated generating reduction, obtains prediction data after calculating.
Utilize predicted valueAs system feedback, system control decision is participated in.
Further, the frequency that the earth source heat pump is obtained according to the predicted value and given temperature of the greenhouse temperature
Controlling value includes:
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For system
The temperature upper limit of setting,For the temperature upper limit value of default.
Fig. 3 shows the structural schematic diagram of the ground source heat pump control system of one embodiment of the invention.As shown in figure 3, should
The ground source heat pump control system of embodiment, comprising:
Greenhouse temperature value acquiring unit 31, the greenhouse temperature value of the historical juncture for obtaining multiple preset time periods；
Temperature prediction value acquiring unit 32, for greenhouse temperature value and the greenhouse temperature ash according to the multiple historical juncture
The predicted value of color prediction model acquisition greenhouse temperature；
Frequency controlling value acquiring unit 33, for being obtained describedly according to the predicted value and given temperature of the greenhouse temperature
The frequency controlling value of source heat pump；
Frequency adjustment unit 34, for adjusting the frequency of the earth source heat pump according to the frequency controlling value.
Further, the greenhouse temperature value acquiring unit, specifically for obtaining the historical juncture of multiple preset time periods
Greenhouse temperature value, corresponding greenhouse temperature value of the multiple historical juncture is updated according to equal-dimension and new-info model.
Further, the temperature prediction value acquiring unit, when specifically for history to the multiple preset time period
The greenhouse temperature value at quarter adds up
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；With linear dynamic model to X1It is fitted and approaches,
Greenhouse temperature grey forecasting model is established, the predicted value of greenhouse temperature is obtained；
Wherein, the column vector of the greenhouse temperature value of the multiple historical juncture is X0=(x(0)(1),x(0)(2),…,x(0)
(n))T,n≥4；x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)(n) for preceding n history
The accumulation result of the greenhouse temperature value at moment,
The frequency controlling value acquiring unit, is further used for
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For system
The temperature upper limit of setting,For the temperature upper limit value of default.
Ground source heat pump control system described in the present embodiment can be used for executing above method embodiment, principle and technology
Effect is similar, and details are not described herein again.
Fig. 4 shows the configuration diagram of the ground source heat pump control system of one embodiment of the invention.As shown in figure 4, should
The ground source heat pump control system of embodiment includes:
Host computer 41, slave computer 42, temperature transmitter 43, frequency converter 44 and earth source heat pump 45；
The greenhouse temperature is sent to 42 slave computers for acquiring greenhouse temperature by temperature transmitter 43；
Slave computer 42 is used to the greenhouse temperature received being sent to host computer 41；
Host computer 41 is used for pre- according to the greenhouse temperature value and greenhouse temperature grey of the historical juncture of multiple preset time periods
The predicted value that model obtains greenhouse temperature is surveyed, and the ground source heat is obtained according to the predicted value of the greenhouse temperature and given temperature
The frequency controlling value of pump；
Frequency converter 44 is used to adjust the frequency of earth source heat pump 45 according to the frequency controlling value.
Fig. 5 shows the interface schematic diagram of host computer in the ground source heat pump control system of one embodiment of the invention.Such as Fig. 5
Shown, using Green Lake farm's attached-greenhouse in the village on Haidian District, Beijing City, as experimental subjects, computer uses Visual as host computer
Basic writes upper computer software.Ceiling temperature sets greenhouse temperature upper limit value, when real time temperature is higher than ceiling temperature, ground source
Heat pump unit stops working.Lower limit temperature sets greenhouse temperature lower limit value, when real time temperature is lower than lower limit temperature, earth source heat pump
Starting.Real time temperature shows current greenhouse temperature, and running frequency shows current earth source heat pump working frequency, and start button starts this
Ground source heat pump control system.
Before non-Frequency Conversion Modification, system is run with full load condition, and setting control system lowest temperature is 5 DEG C, in temperature
7 DEG C are limited to, using half an hour as the sampling time, records earth source heat pump frequency converter working frequency, as shown in Figure 6.
It introducing temperature gray prediction and carries out Frequency Conversion Modification, setting control system lowest temperature is 5 DEG C, and temperature upper limit is 7 DEG C,
Using half an hour as the sampling time, earth source heat pump frequency converter working frequency is recorded, as shown in Figure 7.
By the comparison of Fig. 6 and Fig. 7 it is found that earth source heat pump control method of the invention and system, more intelligent adjusting frequency converter
Power, saved the energy.
Earth source heat pump control method and system provided by the invention replace real-time temperature values using the predicted value of greenhouse temperature
As controller input a part, realize Prior Control, with traditional oepration at full load control earth source heat pump start-stop time and
Control valve flow has preferably been fitted greenhouse temperature to realize temperature control in greenhouse compared to unit loss, gray prediction is reduced
Variation tendency has saved the energy.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case where bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (6)
1. a kind of earth source heat pump control method characterized by comprising
Obtain the greenhouse temperature value of multiple historical junctures of preset time period；
The prediction of greenhouse temperature is obtained according to the greenhouse temperature value of the multiple historical juncture and greenhouse temperature grey forecasting model
Value；
The frequency controlling value of the earth source heat pump is obtained according to the predicted value of the greenhouse temperature and given temperature；
The frequency of the earth source heat pump is adjusted according to the frequency controlling value；
The frequency controlling value that the predicted value and given temperature according to the greenhouse temperature obtains the earth source heat pump includes:
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For default
Temperature upper limit,For the temperature upper limit value of default.
2. earth source heat pump control method according to claim 1, which is characterized in that described to obtain the multiple of preset time period
The greenhouse temperature value of historical juncture includes:
The greenhouse temperature value for obtaining multiple historical junctures of preset time period, when according to equal-dimension and new-info model to the multiple history
Corresponding greenhouse temperature value is carved to be updated.
3. earth source heat pump control method according to claim 1, which is characterized in that described according to the multiple historical juncture
Greenhouse temperature value and greenhouse temperature grey forecasting model obtain greenhouse temperature predicted value include:
The column vector of the greenhouse temperature value of the multiple historical juncture is
X0=(x(0)(1),x(0)(2),…,x(0)(n))T,n≥4；
Cumulative to the greenhouse temperature value of the multiple historical juncture
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；With linear dynamic model to X1It is fitted and approaches, establish
Greenhouse temperature grey forecasting model obtains the predicted value of greenhouse temperature；
Wherein, x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)(n) for preceding n history when
The accumulation result of the greenhouse temperature value at quarter,
4. a kind of ground source heat pump control system characterized by comprising
Greenhouse temperature value acquiring unit, the greenhouse temperature value of the historical juncture for obtaining multiple preset time periods；
Temperature prediction value acquiring unit, for the greenhouse temperature value and greenhouse temperature gray prediction according to the multiple historical juncture
The predicted value of model acquisition greenhouse temperature；
Frequency controlling value acquiring unit, for obtaining the earth source heat pump according to the predicted value and given temperature of the greenhouse temperature
Frequency controlling value；
Frequency adjustment unit, for adjusting the frequency of the earth source heat pump according to the frequency controlling value；
The frequency controlling value acquiring unit is further used for:
WhenWhen, f=0；
WhenWhen, f=f-5；
WhenWhen, f is constant；
WhenWhen, f=f+5；
WhenWhen, f is constant；
Wherein,For subsequent time temperature prediction value, f is earth source heat pump operating frequency value,For default
Temperature upper limit,For the temperature upper limit value of default.
5. ground source heat pump control system according to claim 4, which is characterized in that the greenhouse temperature value acquiring unit,
It is further used for obtaining the greenhouse temperature value of the historical juncture of multiple preset time periods, according to equal-dimension and new-info model to the multiple
Historical juncture, corresponding greenhouse temperature value was updated.
6. ground source heat pump control system according to claim 4, which is characterized in that the temperature prediction value acquiring unit,
It is further used for adding up to the greenhouse temperature value of the multiple historical juncture
X1=(x(1)(1),x(1)(2),…,x(1)(n))T,n≥4；
With linear dynamic model to X1It is fitted and approaches, establish greenhouse temperature grey forecasting model, obtain the pre- of greenhouse temperature
Measured value；
Wherein, the column vector of the greenhouse temperature value of the multiple historical juncture is X0=(x(0)(1),x(0)(2),…,x(0)(n))T,
n≥4；x(0)It (n) is the greenhouse temperature value of n-th of historical juncture；T is matrix transposition；x(1)(n) for the preceding n historical juncture
Greenhouse temperature value accumulation result,
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| CN107121925A (en) * | 2017-04-20 | 2017-09-01 | 株洲中车时代电气股份有限公司 | The control method and system of current transformer blower fan based on gray prediction and fuzzy control |
| CN108119990B (en) * | 2017-12-18 | 2019-02-15 | 珠海格力电器股份有限公司 | Air source heat pump and its control method and device |
| CN109816166B (en) * | 2019-01-17 | 2022-11-29 | 山东大学 | Ground source heat pump system performance prediction method |
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| CN201555314U (en) * | 2009-06-04 | 2010-08-18 | 袁谊 | Novel linkage control system for ground source heat pump and air-conditioning water circulating pump |
| CN202032705U (en) * | 2011-04-19 | 2011-11-09 | 沈阳工业大学 | Novel intelligent ground source heat pump control system |
| CN202547023U (en) * | 2012-04-26 | 2012-11-21 | 中高恒业科技（北京）有限公司 | Automatic control system for ground source heat pump |
| CN203298525U (en) * | 2013-04-28 | 2013-11-20 | 浙江陆特能源科技有限公司 | Energy-saving regulation control device suitable for ground-source heat pump system |
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