KR101005231B1 - Control system for thermal energy storage in aquifer - Google Patents

Abstract

PURPOSE: A control system for thermal energy storage in an aquifer is provided to use an aquifer thermal mass as the heat exchange medium of a heat pump by diving heat-exchanged water into a cold part and a hot part and storing them the aquifer. CONSTITUTION: In a control system for thermal energy storage in an aquifer, a cold water gad(10) is formed in an underground aquifer. Cold stored underground water with low temperate is pumped from the cold water gad. The temperature of the underground water is stored in the cold water gad. A heat stored underground water is pumped from the hot water gad(20) in winter season.

Description

Aquifer Regenerative Control System {CONTROL SYSTEM FOR THERMAL ENERGY STORAGE IN AQUIFER}

The present invention relates to aquifer heat storage control system. Specifically, the present invention relates to an aquifer heat storage control system that utilizes cold / hot heat storage of aquifer for cooling and heating by using an underground aquifer as a cold heat storage body.

Geothermal heat storage heat pump system is being developed to secure the heat source required for cooling and heating through heat exchange using geothermal heat with constant temperature even with seasonal changes.

Patent documents include a heat storage type geothermal heat pump unit of Korean Patent No. 530259, a geothermal heat pump system of Korean Patent No. 949888, and the like. These conventional patent documents are a closed loop geothermal heat pump system that circulates to pump and recover underground groundwater in one groundwater hole, and is used for cooling and heating by storing a heat medium of cold or heat in a separate heat storage tank.

That is, in these conventional patent documents, the heat is stored in a heat storage tank about 5 to 10 ° C. through heat exchange in a heat pump using a constant geothermal heat at about 15 ° C. or heat storage in a heat storage tank about 45 to 60 ° C. As the basic heat source of heat storage for cooling and heating is geothermal heat constant around 15 ℃ to obtain the target heat storage temperature of the heat pump capacity or load is high.

The present invention is to solve the above-mentioned problems, without using geothermal heat around 15 ℃ as the primary heat source for the heat storage for direct cooling and heating, the groundwater heat exchanged by the operation of the heat pump divided into cold and warm heat again the underground aquifer It is to provide a more efficient heat storage heat pump system using the underground aquifer heat storage body by realizing a closed loop heat storage control system that is recovered and regenerated in the underground aquifer and using the heat accumulating underground aquifer heat storage body as a heat exchange heat source of the heat pump.

In order to achieve the above object, according to one aspect of the present invention, the cold water crystal is formed in the underground aquifer, the cold water is stored in the cold storage heat storage during the cooling of the summer and the ground water is deprived of heat during the heating in winter cold storage heat storage; A hot water well formed in the underground aquifer and spaced apart by a predetermined distance limited to cold water crystals and thermal interference, and pumped underground water that has been thermally heated during winter heating and absorbed heat during summer cooling; A groundwater pipe for supplying groundwater pumped from cold and hot water wells to a heat pump, and recovering groundwater heat exchanged from the heat pump and injecting the hot water and cold water wells; A heat pump transferring the cold heat of the cold heat groundwater pumped from the cold water well to the storage heat medium, and transferring the heat of the hot water ground pumped from the hot water well to the storage heat medium; A heat storage tank connected to the heat pump and the heat medium pipe, and storing a storage heat medium of cold or warm heat received from the heat pump through the heat medium pipe; And a controller for automatically controlling the operation of the heat pump and the groundwater pumping from the cold and hot water wells and the groundwater injection into the cold and hot water wells according to the set cooling or heating mode. An aquifer heat storage control system using an underground aquifer as a cold / hot heat storage body is proposed.
Preferably, the depth of the cold water well is formed to the upper portion of the underground aquifer, the depth of the hot water well to reach the bottom of the underground aquifer, so that the depth of the cold water well and the hot water well is hydraulically isolated by the impermeable layer.
Preferably, the submersible motor pump is installed in each of the cold water well and hot water well, the cooling and thermally stored groundwater, and the heated and thermally stored groundwater at the time of heating, respectively, the submersible motor pump to supply to the groundwater pipe; And a first circulation pump installed on the heat medium pipe and discharging the storage heat medium to the heat pump. It further comprises.
Preferably, it is installed on the groundwater pipeline, and under the control of the controller, the groundwater supply pipe connected to the pumping stopped submersible motor pump and the groundwater recovery pipe to the cold or hot water pump being pumped and at the same time pumping the underwater motor pump Shut-off valves for opening the groundwater supply pipe connected to the ground and the groundwater recovery pipe to the pumped cold water or hot water well; A cooling and heating conduit for circulating heat storage heat medium of cold storage or heat storage of the heat storage tank to exchange heat with the building air conditioning equipment; And a second circulation pump installed on the air conditioning pipe and discharging the storage heat medium to the building air conditioning equipment. It further comprises.
Preferably, the heat medium pipe direction control valve for controlling the flow direction of the heat medium pipe according to the control of the controller so that the storage heat medium heat exchanged with the heat pump is returned to the bottom of the heat storage tank during the summer cooling, and to the top of the heat storage tank during the winter heating. In addition, the heat storage is made so that the storage heat medium stored in the heat storage tank is gradually uniform after stratification.
In addition, the heating and cooling pipe directional control valve is installed on the air-conditioning pipe, and discharged from the lower part of the heat storage tank during cooling and returned to the upper part of the heat storage tank, and is discharged from the upper part of the heat storage tank when heating and returns to the lower part of the heat storage tank. It includes more.

Preferably, the controller controls the shutdown and restart of the heat pump and the stop and re-pump of groundwater pumping from the cold and hot water wells according to the temperature of the storage heat medium stored in the heat storage tank.

Preferably, the controller stops the operation of the heat pump, the first circulation pump and the submersible motor pump when the temperature of the storage heat medium of the heat storage tank reaches a predetermined target temperature, and the stored storage heat medium after the operation stops the predetermined temperature of the target temperature. If out of range, the heat pump, the first circulation pump, and the submersible motor pump during operation are controlled to be restarted.
Preferably, the controller controls the groundwater pumping flow rate, or the circulation flow rate of the storage heat medium, or the groundwater pumping flow rate and the circulation flow rate of the storage heat medium, depending on the temperature of the storage heat medium of the heat storage tank and the temperature of the ground water.

Further, more preferably, the heat storage target temperature of the storage heat medium of the heat storage tank is in the range of 5 to 10 ° C during summer cooling, and in the range of 45 to 55 ° C, preferably 45 to 50 ° C during winter heating.

는 냉방시 +(4~7)℃, 바람직하게는 +(4~6)℃ 이고, 난방시 -(4~7)℃, 바람직하게는 -(4~6)℃ 이다.

또 바람직하게는, 제어기기의 제어조건이 되는 저장 열매체의 온도는 축열조에서 유입온도 및 배출온도의 차이 또는 측정온도 및 목표온도의 차이이다. 또한, 제어기기의 제어조건이 되는 지하수의 온도는 축열된 후 펌핑되는 지하수의 온도, 또는 펌핑되는 지하수와 주입되는 지하수의 온도 차이이다.
Further more preferably, the above-mentioned predetermined allowable range

Is + (4-7) ° C at cooling, preferably + (4-6) ° C, and-(4-7) ° C at heating, preferably-(4-6) ° C.

Further, preferably, the temperature of the storage heat medium, which is a control condition of the controller device, is a difference between the inlet temperature and the discharge temperature in the heat storage tank or the difference between the measurement temperature and the target temperature. In addition, the temperature of the groundwater which is the control condition of the controller is the temperature of the groundwater to be pumped after the heat storage, or the temperature difference between the pumped groundwater and the groundwater to be injected.

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Preferably, the controller described above controls the groundwater pumping flow rate and / or the circulation flow rate of the storage heating medium in accordance with the difference in temperature in the storage heating medium or the temperature of the groundwater in the above-described embodiments, together with the processing capacity of the heat pump. To control.

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Also, preferably, the aquifer heat storage control system further comprises a flow regulating valve installed on the ground water supply line for supplying the ground water pumped by the heat pump, and the aforementioned controller is an underwater motor pump, a flow regulating valve, or The submersible motor pump and the flow regulating valve are controlled to control the groundwater pumping flow rate from the cold or hot water well, and the controller controls the first circulation pump to adjust the circulation flow rate of the storage heating medium.

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Preferably, according to another aspect of the present invention, the target temperature of the cold water crystal used as the heat storage body as the heat storage body is in the range of 5 to 10 ° C., and the target temperature of the hot water crystal as the heat storage body is 20 to 30 ° C., preferably It is in the range of 25 to 30 ° C.

Although not explicitly mentioned as one preferred aspect of the present invention, it is apparent that embodiments according to various possible combinations of the above-mentioned technical features can be implemented.

According to the aspect of the present invention, instead of using geothermal heat around 15 ° C as a basic heat source for heat storage for direct heating and cooling as in the prior art, the groundwater heat-exchanged according to the operation of the heat pump is divided into cooling heat and heat and recovered to the underground aquifer. By heat storage in the underground aquifer, the underground aquifer heat accumulator divided into cold heat and heat is used as a heat exchange heat source of the heat pump, thereby implementing a more efficient aquifer heat storage control system using the underground aquifer heat accumulator.

It is apparent that various effects not directly mentioned in accordance with various embodiments of the present invention may be derived by those skilled in the art from various configurations according to embodiments of the present invention.

1 is a schematic diagram of an aquifer heat storage system applied to an embodiment of the present invention.
2 is a schematic system diagram of an aquifer heat storage control system according to an embodiment of the present invention.
3 is a schematic block diagram showing a control state of the aquifer storage control system according to another embodiment of the present invention.
4 is a schematic view showing a heat pump of the aquifer storage control system according to another embodiment of the present invention.

Embodiments of the present invention for achieving the above object are described with reference to the accompanying drawings. In describing the embodiments, the same reference numerals refer to the same configuration, and additional descriptions that may overlap or limit the meaning of the invention may be omitted in describing the embodiments of the present invention.

1 is a schematic diagram of an aquifer heat storage system applied to an embodiment of the present invention, and FIG. 2 is a schematic system diagram of an aquifer heat storage control system according to an embodiment of the present invention. 3 is a schematic block diagram showing a control state of the aquifer storage control system according to another embodiment of the present invention.

The present invention relates to an aquifer heat storage control system using an underground aquifer as a cold heat storage body, and a specific embodiment will be described with reference to FIGS. 1 to 3.

According to one embodiment, the aquifer heat storage control system comprises a cold water tank 10, a hot water tank 20, groundwater pipeline 30, heat pump 50, heat storage tank 70 and the controller 40. .

The cold water well 10 and the hot water well 20 are formed in an underground aquifer and are spaced apart by a predetermined distance d, which is limited to thermal interference. Each of the cold water well 10 and the hot water well 20 may be one well, preferably at least one well, and preferably each of a plurality of wells. Preferably, the number of wells is determined in consideration of the quantity of pumpable water and the capacity of the heater pump 50 from day to day over a period of time from each well.

In the present invention, the underground aquifer is a layer containing groundwater, which has pores filled with water, and the groundwater can move through the interconnected pores. In the present invention, since the underground aquifer is used as a heat storage body, it is preferable to have a hydraulic property with a large porosity and a slow flow rate. Preferably, in the present invention, the underground aquifer may be formed in the porous medium layer or the cracked rock layer. Preferably, the underground aquifer is a free faced aquifer or a confined aquifer. In the present invention, when the underground aquifer is a free-surface aquifer, the free-surface aquifer is composed of silt or clay at the top and is covered with an impervious layer through which water does not pass well, or the free surface aquifer is low. It is desirable for the top of the underground aquifer to play a role of thermally conductive and / or hydraulic protection for the underground aquifer. Preferably, the free-surface aquifer can be formed in a crushed or weathered zone, which is an alluvial layer that is a porous medium layer or a cracked rock layer. In the case of an alluvial layer, it is preferable that it consists of sand, gravel, etc. which are covered with the impermeable layer of a clay or a silt layer in the upper part, and it is preferable that it is covered with the impermeable layer of a clay or a silt layer in the upper part in the case of a crushing layer. In addition, in the present invention, when the underground aquifer is a pressured aquifer, the upper part of the pressured aquifer is covered with an impermeable layer. The pressured aquifer can be composed of porous rock or cracked rock layers. In the present invention, the impermeable layer is used in the sense of including a non-permeable layer (aquifuge) consisting of an aquiclude layer (층 水 難 透, aquiclude) and the water does not penetrate. In the present invention, the underground aquifer has a large porosity and may contain a large amount of groundwater, and it is sufficient if it is formed in a low flow rate layer. Furthermore, it is preferable that the upper part of the underground aquifer plays a thermally conductive and / or hydraulic protection role against the groundwater. desirable.

Referring to FIG. 2, a distance d limited by thermal interference refers to a distance at or above which there is no or extremely limited thermal interference from one groundwater injection well to another groundwater pumping well over a predetermined period of time. In this case, preferably, the predetermined period may be from 6 months according to the summer and winter season, preferably 3 to 5 months, which is the aquifer heat storage period according to the actual heat pump operation. Extremely limited thermal interference from one groundwater injection well to another groundwater pumping well means that the intermediate temperature transition zone formed between the groundwater heat accumulators of both wells does not form the other groundwater pumping well It is formed to be spaced apart from an appropriate distance from another groundwater pumping well. In general ground heat behavior is transmitted through convection by the flow of groundwater, conduction through the medium, and dispersion due to the nonuniformity of the medium. For example, the distance d in which thermal interference is limited can be set by numerically analyzing the thermal behavior in the ground by the heat flux calculation model proposed by Molson et al. The process of calculating the distance (d) at which thermal interference is limited is not an intrinsic scope of the present invention, and the predetermined distance (d) at which thermal interference is limited is known to those skilled in the art through enumerated copper numerical analysis models. Since the self can be easily performed, a detailed description thereof will be omitted.

The cold water well 10 and the hot water well 20 cover the upper part with a cover or a cover box so that external foreign matter does not penetrate into the well, and preferably, the groundwater pipeline 30 passes through the cover or cover box or is at the side of the upper part of the well. Through the groundwater pipe 30 to be injected into the well. Preferably, the inside of the well of the cold water well 10 and the hot water well 20 grouts the strata formed in the upper part of the underground aquifer to prevent the penetration of groundwater or foreign matter.

In the present invention, since the cold water crystal 10 and the hot water crystal 20 are used as cold / hot heat accumulators, they are preferably used within one year, more preferably at least 6 months, more preferably at least between winter and summer. There should be little or no thermal interference due to the flow of groundwater between the cold water wells 10 and the hot water wells 20 formed in the underground aquifer within approximately three to five months, the actual duration of the pump 50. Preferably, the cold water well 10 and the hot water well 20 may be hydraulically isolated by an impermeable layer such as a hard water permeable layer or a non-water permeable layer, and preferably, the depth of the cold water well 10 and the hot water well 20 Are not necessarily the same and may vary in depth.

Preferably, although not shown, the cold water well 10 and the hot water well 20 have a difference in depth, but the depth of the cold water well 10 is above the underground aquifer, and the depth of the hot water well 20 is below the underground aquifer. It is installed to be located. Further, preferably, the depths of the cold water wells 10 and the hot water wells 20 may be positioned to be hydraulically isolated or nearly isolated by an impermeable layer, such as an impermeable or non-permeable layer.

In the cold water well 10, the ground water that is cold-heated and stored during cooling in the summer is pumped, and the ground water which is deprived of heat during the heating in winter is injected and cold-heated.

In the hot water well 20, the ground-heated thermal water that is thermally heated during the winter heating is pumped, and the groundwater that absorbs the heat during the summer cooling is injected and thermally stored.

Preferably, the cold water well 10 and the hot water well 20 are provided with a temperature sensor (not shown) for sensing the temperature of the regenerated ground water. The temperature sensor (not shown) may be installed on the ground water pipe 30 that is introduced into the heat pump 50 and / or discharged from the heat pump 50 rather than the cold water well 10 and the hot water well 20. It may be.

The groundwater pipeline 30 supplies the groundwater pumped from the cold water well 10 and the hot water well 20 to the heat pump 50, and recovers the groundwater heat exchanged from the heat pump 50 to recover the hot water well 20 and the cold water. Inject into quartz (10). During cooling, the groundwater pipeline 30 supplies the cold heated groundwater pumped from the cold water well 10 to the heat pump 50, recovers groundwater heat exchanged from the heat pump 50, and injects it into the hot water well 20. During heating, the groundwater pipe 30 supplies the groundwater pumped from the hot water well 20 to the heat pump 50, recovers the groundwater heat exchanged from the heat pump 50, and injects it into the cold water well 10.

Preferably, the temperature of the groundwater recovered from the heat pump 50 and used as the heat storage body for cooling is 20 to 30 ° C., preferably 25 to 30 ° C., and is recovered from the heat pump 50 for heating and used as the heat storage body. Groundwater temperature is 5 ~ 10 ℃. That is, preferably, the temperature which thermally thermally accumulates in the hot water well 20 is 20-30 degreeC, Preferably it is 25-30 degreeC, and the temperature which cold-thermally accumulates in the cold water crystal | crystallization 10 becomes 5-10 degreeC. The temperature of the groundwater used as the heat storage body may vary depending on the heat capacity converted by the heat pump 50.

In addition, referring to Figure 2, in another embodiment of the present invention, the flow rate control valve 35 is further provided on the ground water supply pipe (30a) for supplying the ground water pumped by the heat pump (50). Preferably, the flow control valve 35 is controlled to supply an appropriate flow rate in accordance with the heat storage temperature of the heat storage tank (70). Preferably, the flow control valve 35 is composed of a remote control valve.

Furthermore, referring to FIG. 2, a filtering device 37 is further provided on the ground water supply line 30a for supplying ground water pumped to the heat pump 50. The filtering device 37 filters foreign matter contained in the groundwater. The filtering device 37 is installed between the flow control valve 35 and the heat pump 50. As the flow rate control valve 35 is controlled, the flow rate of the groundwater supply to the heat pump 50 is adjusted, and preferably, the control of the submersible motor pumps 11 and 21 installed in the cold water well 10 and the hot water well 20 is performed. Controlled together, the groundwater supply flow rate is regulated. Also preferably, a pressure pump 39 is further provided on the ground water supply line 30a for supplying ground water pumped to the heat pump 50.

In the embodiment of the present invention, the heat pump 50 transfers the cold heat of the cold heat ground water pumped from the cold water well 10 to the storage heat medium 71, and stores the heat of the warm ground water pumped from the hot water well 20 to the storage heat medium. To 71. The configuration of the heat pump 50 will be described with reference to FIG. 4.

4, the heat pump 50 in the embodiment of the present invention is the first heat exchanger 51, the second heat exchanger 53, the compressor 55, expansion valve 57 and the heat pump direction control It comprises a valve (59). Furthermore, preferably, the heat pump 50 further includes an accumulator 52, an oil separator 54, a receiver 56, a filter drier 58, and a liquid level gauge 60. It is done by

The first heat exchanger 51 acts as a condenser during summer cooling and as an evaporator during winter heating to heat the refrigerant with the pumped groundwater.

The second heat exchanger 53 acts as an evaporator during summer cooling, and acts as a condenser during winter heating to heat-exchange the refrigerant and the storage heat medium 71 to accumulate cold heat and heat with the storage heat medium 71.

In addition, as shown in Figure 4, the temperature sensor (66a, 66b) for detecting the temperature of the refrigerant is installed on the inlet side and the discharge side of the first heat exchanger 51, the second exchanger 53 Temperature sensors 65a and 65b are installed on the inflow side and the discharge side to detect the temperature of the refrigerant The temperature of the refrigerant measured by the temperature sensors 65a, 65b, 66a and 66b is controlled by the heat pump in the controller 40. It is used as information for controlling 50.

The compressor 55 compresses the refrigerant and discharges the refrigerant to a heat exchanger serving as a condenser. Preferably, referring to FIG. 4, the high pressure gauge 63 is installed on the pipeline discharged from the compressor 55, and the low pressure gauge 64 is installed on the pipeline flowing into the compressor 55. 62 is installed to protect the compressor 55 and the heat pump 50 by shutting off the hip pump relay power (not shown) when the pressure of the refrigerant is too high or low. Also, preferably, a temperature sensor is installed at the inflow side to the compressor 55 and the discharge side conduit from the compressor 55 to measure the temperature of the refrigerant flowing into or out of the compressor 55.

The expansion valve 57 expands the refrigerant passing through the heat exchanger acting as a condenser and sends it to the heat exchanger acting as an evaporator. Preferably, two expansion valves 57a are operated when the first heat exchanger 51 acts as a condenser and two expansion valves 57b are operated when the second heat exchanger 53 acts as a condenser.

The heat pump direction control valve 59, preferably the four-way solenoid valve, controls the flow direction of the refrigerant so that the first heat exchanger 51 and the second heat exchanger 53 alternately act as condensers and evaporators. Referring to FIG. 4, when the first heat exchanger 51 acts as a condenser, the heat pump direction control valve 59 sends the refrigerant discharged from the compressor 55 to the first heat exchanger 51. When the second heat exchanger 53 acts as a condenser, the heat pump direction control valve 59 has a refrigerant flow direction to direct the refrigerant discharged from the compressor 55 to the second heat exchanger 53. Is switched.

The liquid separator 52 is installed before the compressor 55 and protects the compressor 55 by preventing liquid back to the compressor 55. The oil separator 54 is installed after the compressor 55 to return oil contained in the refrigerant discharged from the compressor 55 to the compressor 55.

In addition, a receiver 56 is provided between the heat exchanger serving as a condenser and the expansion valve 57. The receiver 56 temporarily stores the refrigerant liquid condensed in the condenser and sends only the refrigerant required by the evaporator to the expansion valve 57, and serves as a kind of safety device.

A filter drier 58 and a sight glass 60 installed after the receiver 56 are installed. The filter drier 58 filters out various foreign matters inside the system. Through the liquid level gauge 60, the injection amount and state of the refrigerant can be directly checked.

Preferably, the temperature information detected by the temperature sensors 65a, 65b, 66a, 66b installed on the first or / and second heat exchanger 51 side and / or the temperature sensors installed on the compressor 55 side. Based on the control unit 40 controls the heat pump 50. Preferably, the compression capacity of the compressor 55 and / or the condensation of the first or second heat exchangers 51 and 53 based on the temperature information detected by the temperature sensors installed in the heat pump 50 and / or The processing capacity of the heat pump 50 can be controlled by controlling the evaporation capacity, the refrigerant speed in the expansion valve 57, and the like. The compression capacity of the compressor 55 and / or the condensation and / or evaporation capacities of the first or second heat exchangers 51, 53 are transferred to the compressor 55 or / and the first and second heat exchangers 51, 53. It can be controlled by controlling the provided RPM controllable inverter motor (not shown).

In FIG. 4, reference numeral 61 denotes a check valve.

Looking at the flow of the refrigerant in the heat pump 50 in detail with reference to Figure 4, during the summer cooling, the heat pump direction control valve 59, for example, the four-way valve through the compressor 55, 1 is controlled to flow to the heat exchanger (51). The high temperature and high pressure refrigerant passes through the condenser, which is the first heat exchanger 51, gives heat of condensation to the cold heat ground pumped from the cold water crystal 10, and becomes a low temperature and high pressure condensation state. The condensed low temperature high pressure refrigerant is depressurized through the expansion valve 57a, and then vaporized in the evaporator, which is the second heat exchanger 53, to absorb the heat of vaporization from the storage heat medium 71. The vaporized refrigerant passes through the compressor 55 again, becomes a high temperature and high pressure, and circulates. Groundwater obtained by the heat of condensation in the condenser, which is the first heat exchanger 51, is recovered to the hot water well 20, and the aquifer of the hot water well 20 is thermally thermally stored. The storage heat medium 71 from which the heat of vaporization is deprived by the evaporator which is the 2nd heat exchanger 53 turns into a cold heat storage heat storage state, and is used for cooling.
During the winter heating, the heat pump direction control valve 59, for example, the four-way valve is directional control so that the high temperature and high pressure refrigerant passing through the compressor 55 flows to the second heat exchanger 53. The high temperature and high pressure refrigerant passes through the condenser, which is the second heat exchanger 53, gives heat to the storage heat medium 71 and becomes a condensation state of the low temperature and high pressure. The refrigerant in the condensed low temperature and high pressure state is reduced in pressure through the expansion valve 57b, and then vaporized in the evaporator, which is the first heat exchanger 51. In the first heat exchanger 51, the refrigerant absorbing the vaporization heat from the groundwater pumped from the hot water well 20 is circulated again through the compressor 55. Groundwater from which the heat of vaporization is removed from the first heat exchanger (51) is recovered by the cold water crystal (10), and the aquifer of the cold water crystal (10) side is regenerated by cold heat. Since the storage heat medium 71 which obtained the condensation heat from the condenser which is the 2nd heat exchanger 53 turns into a heat storage heat storage state, it is used for heating.

In addition, in the embodiment of the present invention, the heat storage tank 70 is connected to the heat pump 50 and the heat medium pipe 80, and the storage heat medium 71 of cold or warm heat received from the heat pump 50 through the heat medium pipe 80. Save). Preferably, the storage heat medium 71 is water. The heat medium pipe 80 is formed to circulate the storage heat medium 71 between the heat storage tank 70 and the heat pump 50.

Also preferably, the heat medium pipe 80 is formed such that the storage heat medium 71 heat-exchanged with the heat pump 50 is returned to the lower portion of the heat storage tank 70 during the summer cooling and to the top of the heat storage tank 70 during the winter heating. do.

Preferably, in one embodiment, the heat storage target temperature of the heat storage tank 70 is in the range of 5 to 10 ° C. during summer cooling, and is in the range of 45 to 55 ° C., preferably 45 to 50 ° C. during winter heating.

In the embodiment of the present invention, the controller 40 operates the heat pump 50 and pumps ground water from the cold water well 10 and the hot water well 20 and the cold water well 10 according to the set cooling or heating mode. The groundwater injection into the hot water well 20 is automatically controlled.

With reference to Figures 2 to 3 looks at one embodiment of the present invention.

Preferably, in one embodiment, the controller 40 stops and restarts the heat pump 50 according to the temperature of the storage heat medium 71 stored in the heat storage tank 70, and the cold water crystal 10 and the ON. Groundwater pumping stops and repumps from the crystal 20 are controlled.

In the present invention, the temperature of the storage heat medium 71 stored in the heat storage tank 70 is stored in the heat storage tank 70 as well as the storage heat medium 71 in a state of being stored in the heat storage tank 70, unless otherwise described, from the heat storage tank 70. It should be understood to include the temperature of the storage heating medium 71 to be discharged or discharged. Therefore, in various embodiments of the present invention, the temperature of the storage heat medium 71 stored in the heat storage tank 70 is discharged to the heat storage tank 70, the discharge side of the heat storage tank 70 to the heat medium pipe 80, and the heat storage tank 70. It can be measured at the inlet side of the side heat medium pipe 80, or the heat medium pipe 80 to the heat pump 50. Preferably, it can be measured by the temperature sensor 85a provided in the discharge side heat medium pipe 80 from the heat storage tank 70, and / or the inlet side heat medium pipe 80 to the heat pump 50. Preferably, the temperature of the storage heat medium 71 stored in the heat storage tank 70 is not the temperature of the relative low temperature of the cold heat storage heat medium 71 which is injected and stored in the heat storage tank 70 during the summer cooling, and is a heat pump in the heat storage tank 70. It is the temperature of the relatively high temperature storage heat medium 71 to be discharged or discharged to the 50, and the temperature of the relatively low temperature storage heat medium 71 to be discharged or discharged from the heat storage tank 70 to the heat pump 50 during the winter heating. .

Preferably, in one embodiment, the temperature of the circulating storage heat medium 71 is circulated to the discharge side heat medium pipe 80 from the heat storage tank 70 and / or to the inlet side heat medium pipe 80 to the heat pump 50. It is measured by the temperature sensor 85a provided and the temperature sensor 85b provided in the discharge side heat medium piping 80 from the heat pump 50, and / or the inflow side heat medium piping 80 to the heat storage tank 70. .

Also preferably, referring to FIG. 2, the aquifer storage control system further includes submersible motor pumps 11 and 21 and a first circulation pump 81.

The submersible motor pumps 11 and 21 are installed in the cold water well 10 and the hot water well 20, respectively. Preferably, the submersible motor pumps 11 and 12 are motor pumps in which an inverter is installed to enable RPM control. It is possible to adjust the pumping flow rate by controlling the RPM of the submersible motor pump (11, 21). Under the control of the controller 40, the submersible motor pumps 11 and 21 installed in the cold water well 10 and the hot water well 20 are alternately operated in accordance with cooling and heating. The submersible motor pump 11 installed in the cold water crystal pump 10 pumps the ground-heat accumulated cold water at the time of cooling, and the submersible motor pump 21 installed in the hot-water well 20 pumps the ground-heat accumulated thermal water at the time of heating. The submersible motor pumps 11 and 21 pump ground water to supply the groundwater pipe 30.

The first circulation pump 81 is provided on the heat medium pipe 80, and the first circulation pump 81 discharges the storage heat medium 71 stored in the heat storage tank 70 to the heat pump 50. Preferably, the first circulation pump 81 is installed on a pipe or a pipe connected to the lower portion of the heat storage tank 70.

Referring to FIG. 3, the controller 40 may include the heat pump 50, the first circulation pump 81, and the submersible motor pump when the temperature of the storage heat medium 71 of the heat storage tank 70 reaches a predetermined target temperature. 11 or 21 are shut down and the heat pump 50, the first circulation pump 81 and the submersible submersible motor pump are stopped when the stored heat medium 71 after the shutdown is out of a predetermined allowable range of the target temperature. Control to restart (11 or 21).

More preferably, the heat storage target temperature of the storage heat medium 71 of the heat storage tank 70 is in the range of 5 to 10 ° C. during summer cooling, and in the range of 45 to 60 ° C. during winter heating.

는 냉방시 +(4~7)℃, 바람직하게는 +(4~6)℃ 이고, 난방시 -(4~7)℃, 바람직하게는 -(4~6)℃ 이다.
Furthermore, preferably, a predetermined allowable range for the target temperature

Is + (4-7) ° C at cooling, preferably + (4-6) ° C, and-(4-7) ° C at heating, preferably-(4-6) ° C.

Also, referring to FIG. 3, in one preferred embodiment, the controller 40 controls the submersible motor pumps 11, 21 to adjust the groundwater pumping flow rate from the cold water well 10 or the hot water well 20. And / or, the controller 40 controls the first circulation pump 81 to adjust the circulation flow rate of the storage heat medium (71).

With reference to Figure 3 looks at an embodiment of the present invention further.
Preferably, the controller 40 may be a groundwater pumping flow rate from the cold water well 10 or the hot water well 20 or / and the heat medium piping according to the temperature of the storage heat medium 71 of the heat storage tank 70 and the temperature of the ground water. The circulation flow rate of the storage heat medium 71 to the heat storage tank 70 through 80 is controlled.

Preferably, the temperature of the storage heat medium 71 which is a control condition in the controller 40 is discharged from or discharged from the temperature of the storage heat medium 71 and the temperature of the storage heat medium 71 introduced or introduced into the heat storage tank 70. It is the difference of the temperature of the storage heating medium 71. In this embodiment, the discharge side heat medium pipe 80 from the heat pump 50 and the inflow side heat medium pipe to the heat storage tank 70 in order to measure the temperature of the storage heat medium 71 flowing into or flowing into the heat storage tank 70. A temperature sensor is provided near the inflow side of the heat medium pipe 80 in the heat storage tank 70, and preferably, the inlet side heat medium pipe 80 into the discharge side heat medium pipe 80 or / and the heat storage tank 70. The temperature sensor 86b is installed. Further, in order to measure the temperature of the storage heat medium 71 to be discharged or discharged from the heat storage tank 70, the heat storage pipe 70 of the heat storage tank 70 near the discharge side to the heat medium pipe 80 and the discharge side heat medium pipe from the heat storage tank 70 ( 80 or the inlet side heat medium pipe 80 to the heat pump 50, the temperature sensor is provided, preferably the inlet side to the discharge side heat medium pipe 80 or / and heat pump 50 from the heat storage tank 70 The temperature sensor 86a is installed in the heat medium pipe 80.

Also, preferably, the controller 40 shown in FIG. 3 may be configured from the cold water well 10 or the hot water well 20 according to the difference between the measured temperature of the storage heat medium 71 stored in the heat storage tank 70 and the set target temperature. The groundwater pumping flow rate of and / or the circulation flow rate of the storage heat medium 71 to the heat storage tank 70 through the heat medium pipe 80 is controlled. The temperature of the storage heat medium 71 stored in the heat storage tank 70 is preferably a temperature of the discharge side heat medium pipe 80 from the heat storage tank 70 and / or the inlet side heat medium pipe 80 to the heat pump 50. It is measured by the sensor 86a. In this case, the preferable heat storage target temperature of the storage heat medium 71 of the heat storage tank 70 is in the range of 5 to 10 ° C. during summer cooling, and in the range of 45 to 55 ° C., preferably 45 to 50 ° C. during winter heating.

Preferably, the temperature of the groundwater which is the control condition in the controller 40 is the temperature of the groundwater pumped from the cold water well 10 or the hot water well 20, or the temperature of the pumped groundwater and the injected groundwater. More preferably, the controller 40 of FIG. 3 is based on the temperature of the ground water pumped from the cold water well 10 or the hot water well 20 and the temperature of the ground water being injected into the hot water well 20 or the cold water well 10. It controls the flow rate of the groundwater pumping from the cold water crystal 10 or the hot water crystal 20 and the circulation flow rate of the storage heat medium to the heat storage tank 70 through the heat medium piping 80. Referring to FIGS. 3 and 4, the cold water crystal 10 is controlled. Alternatively, the temperature of the ground water pumped from the hot water well 20 may be a temperature sensor 36a installed in the inlet side ground water supply line 30a to the heat pump 50 and / or the cold water well 10 or the hot water well 20 that is being pumped. ), The temperature of the ground water injected into the hot water well 20 or the cold water well 10 is discharged from the heat pump 50, the groundwater recovery pipe 30b or / and the ground water is recovered and the cold water well in progress of the heat storage ( 10) or by temperature sensor 36b installed in hot water well 20.

Considering not only the temperature of the ground water pumped, but also the temperature difference between the incoming and outgoing storage heat medium 71 or the difference between the target temperature and the measured temperature of the storage heat medium 71, the ground water pumping flow rate and / or the storage heat medium 71 Control the circulation flow rate.

Further preferably, in one embodiment, the controller 40 of FIG. 3 is characterized in that the temperature difference in the storage heat medium 71 (the temperature difference between the storage heat medium 71 introduced and discharged) in the above-described embodiments. Or the difference between the target temperature and the measured temperature) and / or the ground water pumping flow rate and / or the circulation flow rate of the storage heat medium 71 according to the temperature of the ground water. The controller 40 controls the compression capacity of the compressor 55 and / or the condensation and / or evaporation capacity of the first or second heat exchangers 51 and 53, the refrigerant velocity in the expansion valve 57, and the like. The processing capacity of the heat pump 50 can be controlled. Preferably, the compression capacity of the compressor 55 and / or the condensation and / or evaporation capacity of the first or second heat exchangers 51, 53 can be controlled by controlling the inverter motor with RPM speed control. In this case, the inverter motor is provided in the compressor 55 and / or the first and second heat exchangers 51 and 53.

2 and 3, an embodiment of the present invention is further described.

Referring to FIG. 2, the aquifer storage control system according to an embodiment further includes a flow control valve 35 installed on the groundwater supply pipe 30a for supplying groundwater pumped by the heat pump 50. Referring to FIG. 3, the controller 40 is preferably an underwater motor pump 11, 21, or a flow regulating valve 35, or more preferably an underwater motor pump 11, 21 and a flow regulating valve ( 35 to control the groundwater pumping flow rate from the cold water well 10 or the hot water well 20 and / or the controller 40 controls the first circulation pump 81 to circulate the storage heating medium 71. Adjust the flow rate.

Also preferably, the submersible motor pumps 11 and 21 and the pressurized pump 39 shown in FIG. 2 are controlled or the submersible motor pumps 11 and 21, the flow control valve 35 and the pressurized pump 39 are controlled. To adjust the groundwater pumping flow rate.

Also, referring to FIG. 2, the aquifer heat storage control system further includes shutoff valves 31 and 33, a cooling and heating conduit 90, and a second circulation pump 91.

Shut-off valves 31 and 33 are installed on the groundwater pipe 30. The ground water pipe 30 includes a ground water supply pipe 30a for supplying ground water to the heat pump 50 and a ground water recovery pipe 30b for recovering ground water from the heat pump 50. The groundwater supply line 30a and the groundwater recovery line 30b may form independent lines up to each well 10 and 20, as shown in FIG. 2, or as illustrated in FIG. 1, an underwater motor pump ( 11, 21) can be combined with the piping. The shutoff valves 31 and 33 are installed in the groundwater supply line 30a and the groundwater recovery line 30b. The shut-off valve (s) 31 installed in the groundwater supply line 30a are groundwater supply pipes from the hot water wells 20 during the summer cooling and from the cold water wells 10 during the winter heating under the control of the controller 40. The furnace 30a is blocked. Preferably, the shutoff valve 31 installed on the ground water supply line 30a is a remote control check valve. The shut-off valve (s) 33 installed in the groundwater recovery line 30b are, under the control of the controller 40, into the groundwater recovery line to the hot water well 20 for heating and to the cold water well 10 for cooling. Block 30b. The shut-off valve (s) 33 installed on the groundwater recovery line 30b are preferably a remote control check valve.

The air conditioning and heating pipe (90) circulates the storage heat medium (71) of the cold or hot heat stored in the heat storage tank (70) to a heating and cooling facility such as a fan coil unit (FCU). Preferably, the cooling and heating pipe (90) is formed so that the storage heat medium (71) is discharged from the lower part of the heat storage tank (70) during the summer cooling, and the upper part of the heat storage tank (70) during the winter heating.

The second circulation pump 91 is installed on the cooling and heating conduit 90, and the second circulation pump 91 discharges the storage heat medium 71 stored in the heat storage tank 70 to the building air conditioning equipment side. Preferably, the second circulation pump 91 is also controlled by the controller 40. Also preferably, the second circulation pump 91 is installed on a pipe or a pipe connected to the lower portion of the heat storage tank 70. Preferably, between the heat storage tank 70 and the second circulation pump 91 is provided with a cooling and heating piping direction control valve 93, for example a four-way solenoid valve, so that the discharged position can be changed. The heating and cooling pipe direction control valve 93 controls the circulation direction of the heating and heating pipes 90 in the storage heating medium 71 to be discharged from the lower part of the heat storage tank 70 during cooling and returned to the upper part of the heat storage tank 70 when heating. Discharged from the upper portion of the 70 and to be returned to the heat storage tank 70.

2, the heat pipe direction control valve 83 is further provided. The heat medium pipe direction control valve 83 controls the heat storage medium 71 heat-exchanged with the heat pump 50 to the lower part of the heat storage tank 70 during the summer cooling, and the heat storage tank during the winter heating according to the control of the controller 40. The flow direction of the heat medium pipe 80 is controlled to be returned to the upper portion of the 70. Preferably, the heat medium pipe direction control valve 83 is a four-way solenoid valve.

The high temperature storage heat medium 71a is stored in the upper part of the heat storage tank 70, and the low temperature storage heat medium 71b is stored in the lower part, and stratified. In the hot and cold storage thermal mediums 71a and 71b to be stratified, high and low temperatures are a relative concept.

Although not shown in FIG. 2, preferably, a pressurized pump is further provided on the ground water recovery pipe line 30b for injecting the heat-exchanged ground water into the cold water well 10 and the hot water well 20, and the heat-exchanged ground water may be injected. have. Also preferably, a packer (not shown) through which the groundwater supply line 30a and the groundwater recovery line 30b pass through the groundwater surface G of the underground aquifer, respectively, of the cold water well 10 and the hot water well 20. Is installed or a cover or cover box (not shown) is installed on the top of the well so that the inside of the well is sealed except the pipeline. The packer or cover, the cover box maintains watertightness, to enable the pressurized injection of groundwater by the pressure pump.

In the above, the present invention has been described with reference to the preferred embodiments with reference to the accompanying drawings. The accompanying drawings and the foregoing embodiments are described by way of example to help those skilled in the art to understand the present invention. Therefore, various embodiments of the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention, the foregoing embodiments are to be considered as illustrative and not restrictive. Therefore, the scope of the present invention should be interpreted according to the invention described in the appended claims rather than the above-described embodiments, and various modifications, alternatives, and equivalents described by the person skilled in the art are described above. It is obvious that it is included in the scope of the.

g: ground surface G: groundwater level in underground aquifer
10: cold water crystal 11, 21: submersible motor pump
20: hot water well 30: underground water pipe
30a: Groundwater Supply Pipeline 30b: Groundwater Recovery Pipeline
31, 33: shutoff valve 35: flow control valve
36a, 36b, 65a, 65b, 66a, 66b, 85a, 85b: temperature sensor
40: controller
50: heat pump 70: heat storage tank
71: storage medium 80: heating medium piping
81, 91: circulation pump 83: heat medium pipe direction control valve
90: air conditioning heating pipe

Claims (15)

Cold water crystal is formed in the underground aquifer, the ground water is pumped cold cooling during summer cooling, the ground water is deprived of heat during winter heating is cold storage heat storage;
A hot water well formed in an underground aquifer and spaced apart from the cold water well by a predetermined distance, the hot water well being pumped and heated by the ground water absorbing heat during the summer cooling;
An underground water pipe for supplying ground water pumped from the cold water well and the hot water well to a heat pump, and recovering ground water heat exchanged from the heat pump to be injected into the hot water well and the cold water well;
A heat pump transferring the cold heat of the cold heated groundwater pumped from the cold water well to the storage heat medium, and transferring the heat of the heated groundwater pumped from the hot water well to the storage heat medium;
A heat storage tank connected to the heat pump and the heat medium pipe, and storing a storage heat medium of cold heat or heat received from the heat pump through the heat medium pipe;
An underwater motor pump installed in each of the cold water well and the hot water well, and pumping the ground water accumulated in the cold heat during cooling and the ground water accumulated in the heat during heating to supply to the ground water pipe;
Installed on the groundwater pipeline, and under the control of the controller, the groundwater supply pipe connected to the pumping stopped submersible motor pump and the groundwater recovery pipe to the cold water or hot water well being pumped and at the same time with the underwater motor pump being pumped Shut-off valves for opening the groundwater supply line connected to the groundwater supply line and the pumped stop of the cold or hot water well;
A first circulation pump installed on the heat medium pipe and discharging the storage heat medium to the heat pump;
The storage heat medium stored in the heat storage tank is controlled to be gradually and uniformly and accumulates after stratification, so that the storage heat medium heat-exchanged with the heat pump is returned to the lower portion of the heat storage tank during summer cooling and to the top of the heat storage tank during winter heating. A heat medium pipe direction control valve for controlling a flow direction of the heat medium pipe according to a control of an apparatus;
A cooling and heating conduit for circulating heat and storage heat medium of the heat storage tank to circulate with the building air conditioning equipment;
A second circulation pump installed on the air conditioning pipe and discharging the storage heating medium to the building air conditioning equipment;
Is installed on the cooling and heating pipe, the cooling and heating pipe for controlling the circulation direction of the storage heat medium to be discharged from the bottom of the heat storage tank and returned to the top of the heat storage tank when heating, and to return to the bottom of the heat storage tank when heating. Directional control valves; And
A controller for automatically controlling the operation of the heat pump, the groundwater pumping from the cold and hot water wells, and the groundwater injection into the cold and hot water wells according to a set cooling or heating mode; , ≪ / RTI >
The depth of the cold water well is formed to the upper portion of the underground aquifer, and the depth of the hot water well is formed to reach the bottom of the underground aquifer, the depth of the cold water well and hot water well is formed to be hydraulically isolated by the impermeable layer,
The controller stops the operation of the heat pump, the first circulation pump and the submersible motor pump when the temperature of the storage heat medium of the heat storage tank reaches a predetermined target temperature, and after the operation stops, the stored storage heat medium becomes the target temperature. If the outside of the predetermined allowable range of the heat pump, the first circulation pump and the operation of the submerged motor pump is stopped to be restarted,
The controller controls the groundwater pumping flow rate, or the circulating flow rate of the storage heat medium, or the groundwater pumping flow rate and the circulating flow rate of the storage heat medium according to the temperature of the storage heat medium of the heat storage tank and the temperature of the ground water.
Aquifer heat storage control system using underground aquifer as cold heat storage body.
delete delete The method according to claim 1,
The heat storage target temperature of the storage heat medium of the heat storage tank is 5 ~ 10 ℃ range during the summer cooling, 45 ~ 50 ℃ range during the winter heating, aquifer heat storage control system.
The method according to claim 4,
The predetermined allowable range

Is + (4 ~ 6) ℃ when cooling,-(4 ~ 6) ℃ heating is aquifer heat storage control system, characterized in that.
The method according to claim 1,
The temperature of the storage heat medium which is a control condition of the controller is a difference between an inlet temperature and an outlet temperature or a difference between a measurement temperature and a target temperature in the heat storage tank,
And the temperature of the groundwater, which is a control condition of the controller, is the temperature difference between the pumped groundwater or the temperature of the pumped groundwater and the injected groundwater after heat storage.
delete delete delete The method according to claim 1,
The controller is configured to control the groundwater pumping flow rate, or the circulation flow rate of the storage heat medium, or the groundwater pumping flow rate and the circulation heat flow of the storage heat medium, depending on the difference in temperature in the storage heat medium or the temperature of the ground water. Aquifer storage control system, characterized in that for controlling the processing capacity of the heat pump.
delete The system of claim 1, wherein the aquifer heat storage control system is:
A flow control valve installed on the ground water supply line for supplying the ground water pumped by the heat pump; It is made, including more
The controller controls the submersible motor pump, the flow regulating valve, or the submersible motor pump and the flow regulating valve to control the groundwater pumping flow rate from the cold water well or the hot water well, and the first circulation pump to control the storage Aquifer heat storage control system, characterized by adjusting the circulation flow rate of the heat medium.
delete delete The method according to any one of claims 1, 4, 5, 6, 10, 12,
The target temperature of the cold water crystal used as the heat storage body as the heat storage body is in the range of 5 to 10 ° C, and the target temperature of the hot water crystal as the heat storage body is in the range of 20 to 30 ° C.

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