KR100421320B1 - A regenerative heat-pump-system having the function of withdrawing waste heats - Google Patents

Abstract

The present invention relates to a waste heat recovery heat storage type heat pump system that enables a heat recovery operation for recovering and reusing domestic waste heat and industrial waste heat as well as cooling and heating operations. The known compressor 310, a condenser 320, The evaporator 330 and the liquid separator 340 are piped through the refrigerant pipe 350, and the refrigerant pipe 350 includes a check valve 353 for blocking the backflow of the refrigerant, and the refrigerant at low temperature and low pressure. An indoor unit 300 having expansion valves 354 and 356 for expanding in a state; A heat exchanger 410 having a heat exchange coil 412 that allows heat exchange with the external air while flowing through the refrigerant from the indoor unit 300, and is provided on one side of the heat exchanger 410 to exchange heat of the refrigerant. In the heat storage type heat pump system consisting of: an outdoor unit (400) consisting of a heat unit (420) for collecting a heat source of the external air, the refrigerant pipe 350 is a plurality of openings or closing the flow path of the refrigerant according to each operation mode The two-way valve 352 is provided, one side of the evaporator 330 waste heat supply source 610 for supplying a waste heat source to the evaporator 330, and a waste heat outlet for discharging the waste heat source from the evaporator 330 ( 620 is provided, the waste heat supply source 610 and waste heat outlet 620 by providing a waste heat recovery heat storage type heat pump system, characterized in that connected to the evaporator 330 via the respective pipes (630, 631). Energy when operating the system It will have to achieve cost efficiency and increase the feeling.

Description

A regenerative heat-pump-system having the function of withdrawing waste heats}

The present invention relates to a heat storage heat pump system, and more particularly, to a heat recovery heat storage heat pump system capable of performing a heat recovery operation for recovering and reusing living waste heat and industrial waste heat as well as cooling and heating operation.

In recent years, the air conditioning of buildings is often required due to the proliferation of office automation equipment and the supply of large-scale computing equipment.In the case of industrial companies, it is necessary to supply cold and hot water all year round to meet the environmental conditions in the process. to be. In accordance with this trend, refrigeration and air conditioning equipment has been developed and distributed for various purposes, and energy-saving devices have been widely used to reduce the rapidly increasing energy consumption.

However, if the waste heat of buildings or industrial sites, especially hot water waste heat sources such as baths, sauna rooms, and lodging facilities can be recovered and recycled, it will greatly contribute to energy saving, but these technologies are not universalized yet.

The conventional heat storage heat pump system performs cooling of a building or an air conditioning space in the summer with one unit, and performs heating in the winter. 1 is a view illustrating a configuration and an operation cycle of a conventional heat pump system 1, and is mainly composed of an indoor unit 100 and an outdoor unit 200 to form a structure in which they are connected to each other.

The indoor unit 100 is provided with a compressor 110, a first heat exchanger 120, and a liquid separator 130 are interconnected via a refrigerant pipe 140, the four-way valve in the refrigerant pipe 140 150, a plurality of expansion valves 162 and 164, and a plurality of check valves 170 are provided. On the other hand, the outdoor unit 200 is composed of a second heat exchanger 210 in which the heat exchange coil 212 is incorporated, and a heat unit 220 provided on one side of the second heat exchanger 210.

In the conventional heat storage type heat pump system 1 having the above configuration, as shown by the arrow “…>” of FIG. 1 during heating operation, the refrigerant gas of the high temperature and high pressure compressed by the compressor 110 is connected to the refrigerant pipe 140. While flowing through the four-way valve 150 is introduced into the first heat exchanger 120, the refrigerant gas in the first heat exchanger 120 is provided via the water pipe 530 from the water supply source 510 While heat-exchanging with water, the temperature of the water is raised to about 45 ° C. In this process, the refrigerant gas is condensed and phase-changed into the refrigerant liquid. Thereafter, the heated water is again transported through the water pipe 531 to supply hot water to the required place through the water supply valve 520.

Meanwhile, the refrigerant liquid condensed in the first heat exchanger 120 expands into the refrigerant liquid of low temperature and low pressure while passing through the expansion valve 164, and continues to flow to the second heat exchanger 210 of the outdoor unit 200. Inflow. In the second heat exchanger 210, the refrigerant liquid is evaporated while being heat-exchanged with the external air collected by the heat unit 220 to phase change into a refrigerant gas of low temperature and low pressure, and the refrigerant gas is separated by the liquid separator 130. After the gas-liquid separation, the gas enters the compressor 110 again and repeats the compression process.

In the cooling operation, as shown by the arrow "->" of FIG. 1, the high-temperature, high-pressure refrigerant gas compressed by the compressor 310 is transported through the refrigerant pipe 140, and the outdoor unit is provided through the four-way valve 150. The second heat exchanger 210 flows into the second heat exchanger 210, and the refrigerant gas in the second heat exchanger 210 condenses heat to the outside air while condensing with the external air collected by the heat unit 220 and is condensed. Will change phase. The refrigerant liquid condensed in the second heat exchanger 210 is expanded at a low temperature and low pressure while passing through the expansion valve 162, and then flows into the first heat exchanger 120 and flows into the first heat exchanger 120. The low temperature low pressure refrigerant liquid is circulated through the load side (not shown) of the room and vaporized while exchanging heat with the returned water to phase change into a low temperature low pressure refrigerant gas. In this process, cold water of a predetermined temperature is formed and the cold water is again The cold water is supplied to the necessary place through the water supply valve 520 while flowing in the water pipe 531. On the other hand, the refrigerant gas vaporized in the first heat exchanger 120 is gas-liquid separated by the liquid separator 130, and then enters the compressor 110 in a gas state again to repeat the compression process.

For reference, in this conventional heat pump system, the flow path of the refrigerant is automatically converted by the four-way valve 150 and the check valve 170 according to each operation mode.

On the other hand, the conventional heat storage heat pump system as described above uses a single heat source of air heat source or water heat source, so there is a problem in that the economic efficiency is low due to the large consumption of energy such as power and fuel for system operation during cooling or heating operation.

The present invention has been made to solve the above-mentioned conventional problems, it is possible to use not only the air heat source or water heat source, but also the surrounding heat or industrial waste heat as an additional heat source to realize energy saving and increase the cost efficiency The purpose is to provide a waste heat recovery regenerative heat pump system.

1 is a schematic diagram showing the configuration and operation mode of a conventional heat storage type heat pump system;

Figure 2 is a system diagram showing the configuration and operation mode of the waste heat recovery heat storage heat pump system according to the present invention.

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

300: indoor unit 310: compressor

320: condenser 330: evaporator

340: liquid separator 350: refrigerant pipe

352: 2-way valve 353: Check valve

354,356: Expansion valve 400: Outdoor unit

410: heat exchanger 412: heat exchange coil

420: Unit 510: water supply source

520: water supply valve 530,531: water pipe

610: waste heat source 620: waste heat source outlet

630,631: Piping

The present invention for achieving the above object is a known compressor, the condenser, the evaporator, and the liquid separator is piped through the refrigerant pipe, the refrigerant pipe is a check valve for blocking the reverse flow of the refrigerant, An indoor unit provided with an expansion valve for expanding the refrigerant to a low temperature and low pressure state; An outdoor unit comprising a heat exchanger having a heat exchange coil configured to exchange heat with external air while flowing through the refrigerant from the indoor unit, and a heat unit provided at one side of the heat exchanger to collect a heat source of external air for heat exchange of the refrigerant; In the heat storage type heat pump system comprising a plurality of two-way valve is provided in the refrigerant pipe to open or close the flow path of the refrigerant according to each operation mode, waste heat supply source for supplying a waste heat source to the evaporator on one side of the evaporator And, there is provided a waste heat discharge port for discharging the waste heat source from the evaporator, the waste heat supply source and the waste heat discharge port provides a waste heat recovery heat storage type heat pump system, characterized in that connected to the evaporator via a pipe.

In addition, a method of operating a heat storage heat pump system, comprising: compressing a refrigerant to a high temperature and high pressure state by a compressor; The high temperature and high pressure refrigerant is introduced into a condenser to exchange heat with water to form hot water at a predetermined temperature, and at the same time, converting into a condensation liquid to change phase; Expanding the phase-changed refrigerant to a low temperature low pressure state while passing through an expansion valve; The low temperature and low pressure refrigerant is introduced into the evaporator, and the waste heat source is introduced into the evaporator from the waste heat source; In the evaporator, the low temperature and low pressure refrigerant is evaporated by heat exchange with the waste heat source, and the waste heat source used in the heat exchange is discharged through the waste heat outlet, and in this process, the waste heat source heat exchanges with water to obtain hot water at a predetermined temperature. Forming; The vaporized refrigerant is gas-liquid separated by the liquid separator and introduced to the compressor in a gaseous state again; provides a method for operating a waste heat recovery heat storage type heat pump system comprising a heat recovery operation consisting of.

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

The same reference numerals are given to the same components as those of the prior art, and the new reference numerals are given only to the new components, and detailed description of the same components is omitted.

2 is a view illustrating a configuration and an operation mode of a waste heat recovery regenerative heat pump system according to the present invention. As shown in FIG. 2, an indoor unit 300 which is a heat generation source for realizing a heating or cooling cycle using a refrigerant. ), And an outdoor unit 400 which makes the refrigerant used in the cooling / heating cycle in the indoor unit 300 exchangeable with external air to make it reusable.

The indoor unit 300 includes a compressor 310 for compressing a refrigerant at a high temperature and high pressure state, a condenser 320 for condensing and liquefying a refrigerant gas of high temperature and high pressure compressed by the compressor 310, and heat from outside air. Absorbs and vaporizes the refrigerant liquid condensed by the condenser 320 to vaporize the refrigerant liquid into a refrigerant gas of low temperature and low pressure, and gas-liquid separation so that the liquid component contained in the refrigerant gas does not enter the compressor 310. It consists of a liquid separator 340 for filtering the refrigerant liquid, these components are interconnected by the refrigerant pipe (350).

The refrigerant pipe 350 includes a plurality of two-way valves 352 configured to open and close the refrigerant passage according to each operation mode such as heating, cooling, and heat recovery operation, and expansion for expanding the refrigerant to low temperature and low pressure according to each operation mode. Valves 354 and 356 are provided, and at the front and rear ends of the two-way valve 352, when the operation mode is changed, the refrigerant flows backward due to the pressure difference inside the refrigerant pipe 350 so that the two-way valve 352 is damaged. In order to prevent this, check valves 353 are provided respectively.

The outdoor unit 400 includes a heat exchanger 410 and a heat unit 420 provided at one side of the heat exchanger 410 to collect heat from external air, and the heat exchanger 410 includes an indoor unit ( The heat exchanger coil 412 is configured to realize heat exchange with external air while the refrigerant transferred from 300 flows through, and the heat exchange coil 412 has one side of the liquid separator 340 via the refrigerant pipe 350. And is connected to the compressor 310, the other side is connected to the evaporator 330 via the refrigerant pipe (350).

On the other hand, the condenser 320 and the evaporator 330 are respectively connected to the room via the water pipes 530, 531, the water supply source 510 is connected to one side of the water pipe 530, the water pipe ( One side of the 531 is provided with a water supply valve 520 for using hot or cold water. In addition, one side of the evaporator 330 is a waste heat supply source 610 for supplying a heat source of the general waste heat discharged from the bath or sauna room or the industrial waste heat discharged from the building or factory, and the evaporator 330 is completed The waste heat discharge port 620 is provided to discharge the waste heat source, and the pipe 630 drawn out from the waste heat source 610 is introduced into the evaporator 330 and the pipe 631 drawn out from the evaporator 330 is provided. It is connected to the waste heat outlet (620).

In the heat storage type heat pump system 2 of the present invention having such a configuration, as shown by the arrow “…>” of FIG. 2 during the heating operation, the refrigerant gas compressed at a high temperature and high pressure in the compressor 310 is condenser 320. ) Is introduced into the water supply source 510 is heated to a predetermined temperature to make hot water, this hot water is supplied to the necessary place in the room through the water supply valve 520 while flowing through the water pipe (531).

Meanwhile, the refrigerant gas heat-exchanged with water in the condenser 320 is converted into a refrigerant liquid by condensing liquid, and the refrigerant liquid is expanded at a low temperature and low pressure while passing through the expansion valve 354, and then the outdoor unit 400 It is introduced into the heat exchanger 410 of the). The refrigerant liquid of low temperature and low pressure introduced into the heat exchanger 410 is vaporized while exchanging heat with the external air collected by the heat unit 420, and is changed into a refrigerant gas again. The refrigerant gas is a liquid separator 340. While passing through the gas-liquid separation, the refrigerant liquid is introduced into the compressor 310 in a filtered pure gas state, and is compressed again to a high temperature and high pressure state.

In the cooling operation, as shown by the arrow "->" of FIG. 2, the refrigerant gas of the high temperature and high pressure compressed by the compressor 310 flows through the refrigerant pipe 350 to heat exchanger of the outdoor unit 400. In the heat exchanger 410, the refrigerant gas is condensed while exchanging heat with the external air collected by the heat unit 420 to change into a refrigerant liquid. The refrigerant liquid flows through the refrigerant pipe 350, expands to a low temperature low pressure state by the expansion valve 356, and then flows into the evaporator 330. In this evaporator 330, the low temperature low pressure refrigerant liquid is the water. Heat exchanged with the water supplied from the source 510 to create a cold water of a predetermined temperature, the cold water is supplied to the necessary place in the room through the water supply valve 520 while flowing through the water pipe 531.

Meanwhile, the refrigerant gas heat-exchanged with water in the evaporator 330 vaporizes and changes into a low temperature low pressure refrigerant gas. The low temperature low pressure refrigerant gas is gas-liquid separated while passing through the liquid separator 340 so that the refrigerant liquid Compressed 310 is introduced into the filtered pure gas state and is compressed again.

In the heat recovery operation, as shown by the arrow "⇒" of FIG. 2, the refrigerant gas of the high temperature and high pressure compressed by the compressor 310 flows into the condenser 320 to exchange heat with water supplied from the water supply source 510. And the hot water is made of a constant temperature, the hot water is supplied to the necessary place of the room through the water supply valve 520 while flowing in the water pipe (531). On the other hand, the high-temperature high-pressure refrigerant gas is condensed during the heat exchange with water in the condenser 320 to phase change into a high-temperature high-pressure refrigerant liquid, the refrigerant liquid is expanded to a low temperature low pressure state while passing through the expansion valve (356) After being introduced into the evaporator 330, in the evaporator 330, the refrigerant liquid of low temperature and low pressure is evaporated while being exchanged with a heat source supplied from the waste heat supply source 610 to phase change into the refrigerant gas. The flow through the 631 is discharged to the outside through the waste heat source outlet 620. In this case, the water supplied from the water supply source 510 is heated to a predetermined temperature in the heat exchange process, and then supplies hot water to the room through the water supply valve 520. Thereafter, the refrigerant gas phase-changed in the evaporator 330 passes through the liquid separator 340 and is introduced into the compressor 310 in a pure gas state in which the refrigerant liquid is filtered, and is compressed again.

On the other hand, the temperature of the waste heat source supplied from the waste heat source 610 during the heat recovery operation may vary slightly depending on the environment around the waste heat source 610, in the present invention, the refrigerant is heat exchanged with the waste heat source in the evaporator 330 As it evaporates into the refrigerant gas, hot water at a predetermined temperature may be formed and supplied to the room.

As described above, in the conventional heat storage type heat pump system 1, the first heat exchanger 120 performs the role of a condenser during the heating operation and the role of the evaporator during the cooling operation. The refrigerant heat-exchanges with water to form hot water, and during cooling, the refrigerant heat-exchanges with water to form cold water, but the waste of power and / or fuel is severe and thermal efficiency is low. System (2) is to reduce the energy, such as power and fuel by recovering the heat source of the various waste heat discarded at home or industrial sites and to use it as an additional heat source in the heat storage heat pump system.

In this way, the present invention is compared to the conventional heat pump system performed the cooling and heating operation using only a single heat source of the air heat source or the heat source, and recovers and adds the heat source of domestic waste heat or industrial waste heat discarded at home or industrial sites. It can be reused as a heat source of energy, thereby saving energy and increasing cost efficiency.

Claims (2)

An indoor unit 300 and an outdoor unit 400 including a compressor 310, a condenser 320, an evaporator 330, expansion valves 354 and 356, and a liquid separator 340 are included. A waste heat water supply pipe 630 and a waste heat water discharge pipe 631 connected to the waste heat supply source are connected, and a pipe 530 for supplying water to each of the evaporator 330 and the condenser 320 and a pipe for discharging the supplied water. In the waste heat type heat pump system connected to (531), In the heating operation, the refrigerant circulates in the order of the compressor 310, the condenser 320, the expansion valve 354, the outdoor unit 400, the liquid separator 340, and the compressor 310, and cools. During operation, the refrigerant circulates in the order of the compressor 310, the outdoor unit 400, the expansion valve 356, the evaporator 330, the liquid separator 340, and the compressor 310, and heat recovery operation. When the refrigerant is circulated in the order of the compressor 310, the condenser 320, the expansion valve 356, the evaporator 330, the liquid separator 340 and the compressor 310 in order. ), The condenser 320, the evaporator 330, the expansion valves 354 and 356, and a refrigerant pipe 350 connecting the liquid separator 340 and the outdoor unit 400, Waste heat recovery heat storage type heat pump system comprising a plurality of valves (352, 353) connected to the refrigerant pipe 350 so that the refrigerant is circulated according to each circulation cycle during heating, cooling, and heat recovery operation. . delete