KR20020013337A - The combined Compact Refrigerative / Regenerative Heat-Pump System - Google Patents

Abstract

PURPOSE: A small cold/heat accumulation type composite heat pump system is provided to achieve an improved use convenience and reduce facility cost by performing cooling operation and heating operation through a single system. CONSTITUTION: A system comprises a condensing unit(400) as an outdoor unit which includes a gas compressor(410) and a heat exchanger(430); a heat accumulation unit(500) for icing the water stored in a heat accumulator(510) and deicing and using the deiced water for a cooling operation during a refrigerating cycle, and heating the water stored in the heat accumulator and using the heated water for a heating operation during the reverse refrigerating cycle; and an air conditioner(600) as an indoor unit which includes a fan coil unit(610) installed in the indoor area so as to perform a heating/cooling operation through a heat exchanging action. The condensing unit includes a four-way valve(420) for controlling flow direction of refrigerant by the refrigerating or reverse refrigerating cycle. The heat accumulator has an auxiliary tank(550) installed inside of the heat accumulator so as to feed the circulating water. The auxiliary tank has an auxiliary heater(552) installed inside of the auxiliary tank so as to heat the circulating water.

Description

Small Combined Refrigeration / Regenerative Heat-Pump System

The present invention relates to the application of a small ice storage heat pump system using a midnight power, and more particularly, by combining the ice storage heat cooling system by the refrigeration cycle and the shrinkage heat heating system by the reverse cycle to be used for cooling and heating alternately according to the season. The present invention relates to a small heat storage and heat storage complex heat pump system.

In general, ice storage equipment is a device that operates the freezer by using the surplus electricity of the late-night time to generate ice and store the ice in the heat storage tank, and then to cool by using the ice of the heat storage tank when the load due to cooling increases.

1 is a schematic diagram of a conventional small ice heat storage heat pump system, and as shown, the small ice heat storage heat pump system includes an outdoor unit 100, a heat storage system 200, and an indoor unit 300. Generally, the circulating water is accommodated in the heat storage tank 210 of the small ice heat storage heat pump system by a predetermined level, and the refrigerant cooled in the outdoor unit passes through the heat exchange coil 211 installed in the heat storage tank 210 at night and accumulates the coil. Ice is formed on the outside, and during the day, the cold water that thawed the ice outside the coil is sent to the indoor unit to achieve indoor cooling. The circulating water used for cooling is recovered to the heat storage tank 210 through the recovery pipe 220, and the refrigerant used to cool the circulating water in the heat storage tank 210 is recovered to the outdoor unit through a recovery pipe, heat exchanged, and then cooled again. You will go through the process.

FIG. 2 is an overall configuration diagram of the heat storage system of FIG. 1, and FIG. 3 is a state diagram of piping inside the heat storage tank 210 of FIG. 2. As shown in the drawing, a water supply valve 212 is provided at an upper side of the heat storage tank 210. The water supply pipe 213 is connected and installed, and a plurality of heat exchange coils 211 having a "⊂" shape along the water depth are formed in the heat storage tank 210 in a state where they are spaced apart from each other. One end of the 211 is connected to a refrigerant supply pipe 214 provided with a filter and a dryer 219. The other end of the heat exchange coil 211 is connected to all of the recovery pipes 215 for integrally recovering the refrigerant moving along each line, and the recovery pipe 215 has a recovery pipe 216 for finally recovering the refrigerant. ) Is connected to draw out to the outside of the heat storage tank (210).

On the other hand, one side bottom surface of the heat storage tank 210 is provided with a circulation pump 217, the circulation pump 217 is connected to the upper portion of the heat storage tank 210 and the connection pipe 218, the corresponding The lower side of the other side is provided with a recovery pipe 220 having a control valve 221 is connected to the interior of the heat storage tank (210). The discharge part of the circulation pump 217 is connected to the indoor unit via a supply pipe 240 for supplying the circulation water, and the indoor unit 230 collects the recovery pipe 230 to recover the circulating water for cooling to the heat storage tank 210. It is connected to the recovery pipe 220 through the).

Conventional small ice heat storage heat pump system can achieve the purpose of indoor cooling by supplying the indoor water through the supply pipe the cold water thawed during the day by freezing the circulating water in the heat storage tank by the operation of the refrigeration cycle using the late-night power. However, in winter there were inconveniences of having to install a separate heating facility for indoor heating and cost problems due to the additional equipment.

The present invention is to improve the above problems, it is possible to switch the cooling or heating according to the season by combining the ice storage heat cooling system by the refrigeration cycle using the late-night power and the shrinkage heat heating system by the reverse cycle The present invention is to provide a small heat storage and heat storage complex heat pump system having an auxiliary tank and an auxiliary heater so that hot water can be used by hot water circulating water when necessary.

1 is a system diagram of a conventional small ice heat storage heat pump system

2 is an overall configuration diagram of the heat storage system of FIG.

3 is a view illustrating the piping inside the heat storage tank of FIG.

Figure 4 is a system diagram of a small heat storage, heat storage composite heat pump system of the present invention

5 is an overall configuration diagram of the heat storage system of FIG.

6 is a diagram illustrating a connection state between the heat storage tank and the recovery pipe of FIG. 5;

* Description of the symbols for the main parts of the drawings *

210,510: heat storage tank

211,511: Heat Exchanger Coils

215,220,580,591: Recovery pipe

216,230,570,590: recovery pipe

212,512: Water supply valve

213,513: water pipe

214,240,530,560: Supply Pipe

217,520: circulation pump

218,521 connection pipe

219,543: Filters and Dryers

221,621: Control valve

431,620: Splitter

400: condensing unit

410 gas compressor

420: 4-way valve

430: heat exchanger

432: strainer

433,542: Check valve

434 Cooling Fan Assembly

435 speed control

440: low pressure switch

450: high pressure switch

460: Accumulator

470: Silencer

480: dual pressure controller

530a, 540: double pipe

541: expansion valve

550: auxiliary tank

551: through hole

552: auxiliary heater

553: hot water supply valve

610: heat coil unit

600: air conditioner

The present invention for achieving the above object, the refrigerating cycle and its reverse cycle can realize both the outdoor unit and the condensing unit 400 including the gas compressor 410 and the heat exchanger 430, during the operation of the refrigeration cycle The heat storage system 500 configured to freeze and then thaw water stored in the heat storage tank 510 to use it for cooling, and to heat the water stored in the heat storage tank 510 to use it for heating during reverse cycle operation. The condensing unit 400 is a composite system of an ice storage heat cooling system and a shrinkage heat heating system, each of which includes an indoor unit, which is an air conditioner 600 composed of a fan coil unit 610, which is installed to promote cooling and heating by heat exchange. Is characterized in that it comprises a four-way valve 420 for controlling the flow direction of the refrigerant in each cycle during the operation of the refrigeration cycle or reverse cycle.

In addition, an auxiliary tank 550 for hot water supply of the circulating water is provided on one side of the heat storage tank 510.

In addition, the auxiliary heater 552 is installed on the inner upper end of the auxiliary tank 550 for hot water supply.

In addition, the refrigerant supply pipe 530 of the heat storage system 500 is provided with a double pipe 540 for controlling the flow direction of the refrigerant according to the refrigeration cycle and the reverse cycle, the expansion of one side of the double pipe 540 A valve 541 is provided and the check valve 542 is provided on the other side of the double pipe 540.

In addition, the refrigerant supply pipe 530 connected to the heat exchanger 430 is provided with a double pipe 530a, a distributor for distributing the refrigerant liquid recovered from the heat storage tank 510 in one pipe of the double pipe 530a. 431 and a strainer 432 for filtering impurities in the refrigerant liquid, and a check valve 433 for preventing back flow of the refrigerant liquid supplied from the heat exchanger 430 is provided at the other side pipe. It is characterized by.

In addition, the heat storage system 500 is characterized in that a plurality of auxiliary heat storage tank can be installed in the heat storage tank 510 to sufficiently heat the heating amount for heating.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a schematic diagram of a small heat storage and heat storage complex heat pump system according to the present invention. As shown in FIG. 4, an outdoor unit, a heat storage tank 510, and a pipe (condensing unit 400) capable of realizing both a refrigeration cycle and a reverse cycle thereof are illustrated. 530, 590, and the indoor unit, which is installed in the room and the air conditioner 600 including the coil unit 610 to be installed in the room to achieve cooling and heating by heat exchange action is composed of a complex system. .

The outdoor unit includes a gas compressor 410 for compressing the evaporated gas refrigerant, and a refrigerant recovered from the heat storage tank 510 such that the gas compressor 410 and the entire cycle become the refrigeration cycle and the reverse cycle, respectively, during the refrigeration cycle and the reverse cycle operation. Or a four-way valve 420 for controlling the flow direction of the refrigerant supplied to the heat storage tank 510, and a heat exchanger 430 to plan the heat exchange of the refrigerant recovered from the heat storage tank 510. The low pressure switch 440 for controlling the lower limit pressure of the refrigerant gas on the left side of the gas compressor 410, the high pressure switch 450 for controlling the upper limit pressure of the refrigerant gas on the right side of the gas compressor 410, and the low pressure switch. An accumulator 460 is provided on the left side of the 440 to prevent the refrigerant liquid from entering the gas compressor 410, and a silencer 470 is provided on the left side of the high pressure switch 450. The supply pipe 530 connecting the heat storage tank 510 and the heat exchanger 430 is provided with a double pipe 530a, and a distributor for distributing the refrigerant liquid recovered from the heat storage tank 510 in one pipe of the double pipe 530a. 431 and a strainer 432 for filtering impurities contained in the refrigerant liquid, and a check valve 433 for preventing reverse flow of the refrigerant liquid supplied from the heat exchanger 430 in the other side pipe. Is provided, the cooling fan assembly 434, the fan speed controller 435 for controlling the speed of the cooling fan opposed to the heat exchanger 430, and a dual pressure controller 480 is provided.

The heat storage system 500 is composed of a heat storage tank 510 in which a plurality of heat exchange coils 511 are formed so that water is filled at a predetermined level and the refrigerant gas flows, and a circulation pump 520 for sending the circulating water to the indoor unit. The supply pipe 530 for supplying the refrigerant to the heat storage tank 510 is provided with a double pipe 540 for controlling the flow of the refrigerant according to the refrigerating cycle and its reverse cycle, and on one side of the double pipe 540 is expanded. A valve 541 is provided and the check valve is provided on the other side.

The indoor unit is an air conditioner 600 installed inside the air conditioner 600 having a coil unit 610 to substantially cool and heat by a heat exchange effect, and the cooling or heating circulation water discharged from the heat storage tank 510 is distributed through the distributor 620. It flows into the indoor unit. The introduced circulating water undergoes a heat exchange by the heat coil unit 610, thereby cooling and heating, and then passes through a circulation path recovered to the heat storage tank 510.

When the entire cycle is operated as a refrigeration cycle, the heat exchanger 430 of the condensing unit 400 is used as a condensation coil for condensing and liquefying the high-temperature and high-pressure gas refrigerant discharged from the gas compressor 410 with water or air at room temperature, The heat exchange coil 511 of the heat storage tank 510 is directly refrigerated by the low temperature low pressure refrigerant liquid condensed in the heat exchanger 430 of the condensing unit 400 absorbing heat from the object to be cooled and changing to a low temperature low pressure gas refrigerant. It is used as an evaporator to realize this.

As shown by an arrow (→) in FIG. 4, the gas refrigerant compressed by the gas compressor 410 has a close intermolecular distance, so that the condensation of liquid gas is easily achieved even when a small amount of heat is removed from the condenser during operation of the refrigeration cycle. Pressure and temperature rise simultaneously. When the condensing unit 400 operates in a refrigeration cycle, the compact heat storage / heat storage complex heat pump system of the present invention functions as a condensation coil through the four-way valve 420 of the high-temperature and high-pressure refrigerant gas compressed by the gas compressor 410. After reaching the heat exchanger 430, which is cooled by the heat exchanger 430, is converted into a refrigerant liquid of low temperature and low pressure, and passes through the check valve 433, the heat storage tank 510 functions as an evaporator. As the heat is introduced into the heat exchange coil 511, the heat is absorbed from the object to be cooled and is converted into a gas refrigerant having a low temperature and low pressure to gradually freeze water stored in the heat storage tank 510 from around the heat exchange coil 511. During the day when the temperature rises, the indoor air is exchanged with ice in the heat storage tank 510 to form a channel, and as shown by an arrow ⇒ in FIG. 4, the melted water is pumped by the circulation pump 520 to form a channel. After circulating through the water channel and heat exchanged by each coil unit 610 of the air conditioner 600 installed in the room, the cooling effect is realized and then returned to the heat storage tank 510. On the other hand, the refrigerant gas used to freeze the water in the heat storage tank 510 passes through the four-way valve 420, the refrigerant liquid is filtered from the accumulator 460, and then flows back to the gas compressor 410.

When the entire cycle is operated as a reverse cycle, the heat exchange coil 511 of the condensing unit 400 is used as an evaporator for converting the refrigerant liquid from the heat storage tank 510 into a gas refrigerant of low temperature and low pressure by collecting heat from the outside air. The heat exchange coil 511 of 510 is used as a condensation coil to condense and liquefy the gas refrigerant of high temperature and high pressure discharged from the gas compressor 410, in which the temperature of the heat storage tank 510 is raised.

As shown by the arrows (...>) of FIG. 4, in the reverse cycle operation, the refrigerant liquid from the heat storage tank 510 is distributed in the distributor 431 and the impurities are filtered by the strainer 432, and then the condensing unit ( After reaching the heat exchanger 430 in 400 and being cooled by the heat exchanger 430 acting as an evaporator and changing into a refrigerant liquid of low temperature and low pressure, the flow direction is controlled by the four-way valve 420. Passing through the accumulator 460, the coolant liquid is filtered in the accumulator 460, and only the gas refrigerant is introduced into the gas compressor 410. The gas refrigerant compressed by the gas compressor 410 is close to the distance between the molecules, so that the condensation can be easily condensed even if a little heat is taken out of the condenser during reverse cycle operation, and the temperature and pressure of the gas are increased at the same time, When the condensing unit 400 operates in a reverse cycle, the high temperature and high pressure refrigerant gas passing through the gas compressor 410 passes through the four-way valve 420 to exchange heat with the heat exchange coil 511 of the heat storage tank 510. Inflow to the inside of the heat storage tank 510 to raise the temperature. As shown by the arrow ⇒ in FIG. 4, the heated water in the heat storage tank 510 is pumped by a circulation pump 520 installed at one side of the heat storage system and circulated through the supply pipe 560 and installed in the room. After heat exchanged by each of the coil units 610 of the conditioner 600 to realize a heating effect, it is returned back to the heat storage tank 510 through the recovery pipe 570. Meanwhile, the refrigerant gas used to heat up the water in the heat storage tank 510 is sent back to the heat exchanger 430 of the condensing unit 400 through the check valve 542.

In the heat storage tank 510 of the small heat storage and heat storage composite heat pump system of the present invention, an auxiliary tank 550 is installed to temporarily store the circulated water recovered through the recovery pipe 570 to use the hot water. The auxiliary tank 550 has a through hole 551 formed at an upper portion thereof so as to communicate with the heat storage tank 510. In the auxiliary tank 550, the auxiliary tank 550 directly heats the circulating water obtained through the recovery pipe 570 to instantly increase the temperature. Auxiliary heater 552 is installed to make. The circulating water heated by the auxiliary heater 552 is discharged to the outside through the hot water supply valve 553 drawn out from the auxiliary tank 550 to be used as hot water.

FIG. 5 is an overall configuration diagram of the heat storage system 500 of FIG. 4, wherein a water supply pipe 513 having a water supply valve 512 is connected to an upper side of the heat storage tank 510, and water is stored in the heat storage tank 510. A plurality of heat exchange coils 511 having a "⊂" shape along the water depth are installed to move along each individual line in a state where they are spaced apart from each other, and one end of each heat exchange coil 511 is provided in one distribution pipe. All are connected, and the center of this distribution pipe is connected with the refrigerant supply pipe for supplying refrigerant. The other end of the heat exchange coil 511 corresponding to the distribution pipe is all connected to a recovery pipe 591 for integrally recovering the refrigerant moving along each line, and the recovery pipe 591 finally receives the refrigerant. It is connected to the recovery pipe 590 for recovery, and this recovery pipe 590 is comprised so that it may be drawn out of the heat storage tank 510. Meanwhile, a circulation pump 520 is installed at one bottom surface of the heat storage tank 510, and the circulation pump 520 is connected to the upper portion of the heat storage tank 510 via a connection pipe 521. The lower side of the other side is provided with a recovery pipe 580 having a control valve is connected to the interior of the heat storage tank (510). The discharge part of the circulation pump 520 is connected like an indoor unit through a supply pipe 560 for supplying the circulation water, and the indoor unit recovers the circulation water for cooling to the heat storage tank 510. 570 is connected to the recovery pipe 580 via a medium.

When the condensing unit 400 of the outdoor unit is operated in a refrigeration cycle, as shown by an arrow (→) in FIG. 5, the refrigerant liquid passes through an expansion valve 541 and a filter / dryer 543 through a refrigerant supply pipe. After being supplied to each heat exchange coil 511 in 510 and recovered through the recovery pipe 590, when the condensing unit 400 of the outdoor unit is operated in a reverse cycle, as shown by arrows (...>) in FIG. Likewise, the refrigerant liquid is supplied along the recovery pipe 590 and supplied to each heat exchange coil 511 in the heat storage tank 510 and then recovered through the check valve through the refrigerant supply pipe.

6 is a view illustrating a connection state between the heat storage tank 510 and the recovery pipe 590 of FIG. 5, as shown in FIG. 6, according to the refrigerant supply pipe 530 of the heat storage system 500 according to a refrigeration cycle and its reverse cycle. A double pipe 540 is provided to control the flow of the coolant, and one pipe of the double pipe 540 is thermally insulated to a low temperature and low pressure state by throttling the refrigerant liquid of high temperature and high pressure, and at the same time to the evaporator load. And an expansion valve 541 and a filter / dryer 543 for adjusting to maintain an appropriate amount of refrigerant supply, and the other pipe is provided in one direction to prevent backflow of the refrigerant liquid recovered from the heat storage tank 510. A check valve is provided to allow only flow.

In the heat storage system 500 of the small heat storage and heat storage complex heat pump system according to the present invention, a plurality of natural heat flow type auxiliary heat storage tanks (not shown) are connected to the heat storage tank 510 to sufficiently store heat for heating. Can be installed. By storing the circulating water heated by using the midnight electric power in a plurality of auxiliary heat storage tanks, it is advantageous to be able to secure enough heat for heating and to be used for emergency heating.

By using the small heat storage and regenerative composite heat pump system of the present invention, summer cooling and winter heating can be performed in one system, thereby making it easy to use and reducing equipment investment costs.

Claims (6)

Both the refrigeration cycle and its reverse cycle can be realized and the outdoor unit, which is the condensing unit 400 including the gas compressor 410 and the heat exchanger 430, and water stored in the heat storage tank 510 during the refrigeration cycle operation. The heat storage system 500 is configured to thaw and use it for cooling and to heat up the water stored in the heat storage tank 510 during the reverse cycle operation, and to use it for heating. A combined system of an ice storage heat cooling system and a shrinkage heat heating system having an indoor unit as an air conditioner 600 composed of a unit 610, wherein the condensing unit 400 is operated at each cycle during the operation of a refrigeration cycle or a reverse cycle. A compact heat storage and heat storage complex heat pump system comprising a four-way valve (420) for controlling the flow direction of the refrigerant. The method of claim 1, Small heat storage, heat storage complex heat pump system characterized in that it comprises an auxiliary tank (550) for hot water supply of circulating water in one side of the heat storage tank (510). The method of claim 2, Small heat storage, heat storage complex heat pump system, characterized in that the auxiliary heater 552 is installed on the inner upper end of the auxiliary tank (550) for hot water supply of circulating water. The method of claim 1, The refrigerant supply pipe 530 of the heat storage system 500 is provided with a double pipe 540 for controlling the flow direction of the refrigerant according to the refrigerating cycle and the reverse cycle, an expansion valve (one side of the double pipe 540) 541) is provided, and the other side of the double pipe (540) is a small heat storage, heat storage composite heat pump system, characterized in that the check valve is provided with 542. The method according to claim 1 or 4, The refrigerant supply pipe 530 connected to the heat exchanger 430 is provided with a double pipe 530a, and a distributor 431 for distributing the refrigerant liquid recovered from the heat storage tank 510 in one pipe of the double pipe 530a. And a strainer 432 for filtering impurities in the refrigerant liquid, and a check valve 433 for preventing a reverse flow of the refrigerant liquid supplied from the heat exchanger 430 in the other side pipe. A compact heat storage and heat storage complex heat pump system. The method of claim 1, The heat storage system 500 is a small heat storage, heat storage type composite heat pump system, characterized in that a plurality of auxiliary heat storage tank can be installed in the heat storage tank (510) in order to sufficiently heat the heating amount for heating.