KR200257232Y1 - heat-pump type device for collecting waste heat - Google Patents

Abstract

Disclosed is a heat pump type waste heat recovery device for significantly reducing energy for making hot water by preheating newly introduced ground water by exchanging heat of waste hot water discharged from a bathroom and a factory. The present invention heat-exchanges heat of hot waste water flowing out of a bathroom or factory with heat medium circulating in the first and second freezing cycles, and exchanges the heat obtained here with cold water to increase energy efficiency. To reduce the cost of waste heat recovery.

Description

Heat-pump type device for collecting waste heat

The present invention relates to a heat pump waste heat recovery device, and in particular, by heat-exchanging the heat of waste hot water discharged from a bathroom and a factory, preheating newly introduced ground water to supply hot water, thereby dramatically reducing energy for making hot water. It relates to a heat pump waste heat recovery device for.

In general, waste water from 30-40 ℃ is used as it is in bathrooms and factories, and it consumes enormous thermal energy.In addition, it is impossible to grow microorganisms to purify water when high temperature waste water flows out. This increases the cost of wastewater treatment.

Due to this increase in treatment cost, an apparatus for recovering heat from waste hot water has been developed. Conventional apparatus for recovering heat from the waste hot water is made of a configuration for preheating the low-temperature ground water by thermally conducting hot waste hot water.

However, such a device for recovering heat from the waste hot water has a problem that the heat recovery efficiency is lowered because it has a configuration that simply conducts heat from the hot waste hot water to the low temperature groundwater.

The present invention is designed to solve the above problems, the second branched from any one heat exchanger performing the first refrigeration cycle and the first refrigeration cycle for heat-exchanging hot waste hot water flowing out of the bath or factory, etc. Through the refrigeration cycle, the liquid refrigerant temperature of 40 ~ 50 ℃ is cooled down to 0 ~ 5 ℃ to increase the density of the liquid refrigerant, improving the capacity of the expansion valve by 40 ~ 50% and absorbing a lot of heat from the evaporator to maximize heat exchange efficiency. It is an object of the present invention to provide a heat pump type waste heat recovery apparatus.

1 is a system diagram for showing a heat pump waste heat recovery device according to the present invention.

Figure 2 is a system diagram for showing another embodiment of the heat pump waste heat recovery apparatus according to the present invention.

<Description of the code | symbol about the principal part of drawing>

110: waste hot water discharge pump 112: evaporator

114: suction tube heat exchanger 116: compressor

118: condenser 120: receiver

122: auxiliary cooling heat exchanger 124: filter

126: sight window 128, 134: expansion valve

130: compact compressor 132: compact compressor

The present invention for achieving the above object,

An auxiliary cooling heat exchanger for heat-exchanging the heat medium for performing the first freezing cycle and the heat medium for performing the second freezing cycle; An expansion valve for reducing the pressure and temperature of the heat medium by receiving the heat medium of the first freezing cycle passed through the auxiliary cooling heat exchanger through a filter; An evaporator for recovering heat of the wastewater by exchanging heat with the heated medium introduced through the expansion valve and the hot wastewater introduced through the waste hot water discharge pump; A suction tube heat exchanger for preventing wet compression and supercooling of the heat medium introduced from the evaporator; A compressor for compressing the heat medium passing through the suction pipe heat exchanger at high temperature and high pressure; A condenser for discharging hot water by heat-exchanging cold water introduced through a high temperature and high pressure heat medium passing through a compressor and a water supply pump; And a first refrigeration cycle for temporarily storing a liquid heat medium passing through the condenser and circulating a receiver for introducing the stored heat medium into the suction tube heat exchanger.

A compact compressor for compressing the heat medium performing the first refrigeration cycle and the heat medium heat-exchanged in the auxiliary cooling heat exchanger; A small condenser for dissipating hot water by heat-exchanging the heat medium passing through the small compressor with cold water introduced through the feed water pump; Preheating the incoming cold water by using the heat of the wastewater by simultaneously performing a second refrigeration cycle that circulates the second expansion valve for lowering the temperature and pressure of the heat-heat exchanged heat medium through the small condenser to enter the auxiliary cooling heat exchanger. It is for.

Heat pump type waste heat recovery apparatus according to the present invention by maximizing the heat exchange efficiency to reduce the energy saving and waste hot water treatment cost.

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

1 is a system diagram for showing a heat pump waste heat recovery apparatus according to the present invention, Figure 2 is a system diagram for showing another embodiment of the heat pump waste heat recovery apparatus according to the present invention.

Waste heat recovery apparatus according to the present invention, as shown in Figure 1, so as to heat-exchange the hot waste water discharged from the bath or factory, etc. with the evaporator 112 performing the first refrigeration cycle through the waste hot water discharge pump 110 It is composed. In the first freezing cycle, the heat medium heat-exchanged with the waste hot water through the evaporator 112 is introduced into the suction tube heat exchanger 114 to be first supercooled, and the heat medium passing through the suction tube heat exchanger 114 is introduced into the compressor 120. , The heat medium introduced into the compressor 120 is compressed to high temperature and high pressure, receives cold water through the water supply pump 119 while passing through the condenser 118, and heat-exchanges the heat medium and cold water compressed at high temperature and high pressure, such as a bathroom or a factory. Is configured to supply the necessary hot water. The heat medium in the liquid state passing through the condenser 118 is temporarily stored in the receiver 120 for temporarily storing the liquefied heat medium and recovering and storing the refrigerant when the device is stopped.

The heat medium firstly cooled while passing through the suction tube heat exchanger 114 is introduced into the auxiliary cooling heat exchanger 122 to be secondly subcooled, and is configured to exchange heat with the heat medium that performs the second freezing cycle.

As the secondary cooling heat exchanger (122) flows in, the thermal medium that has exchanged heat with the heating medium for performing the second freezing cycle passes through the filter (124) and the sight glass (126) to maximize the heat absorption capacity and at the same time, In response to the change is configured to flow into the evaporator 112 through an expansion valve 128 for adjusting the appropriate refrigerant flow rate.

The second refrigeration cycle for circulating the heat medium separately from the first refrigeration cycle is configured such that the heat medium passing through the auxiliary cooling heat exchanger 122 heat-exchanged with the heat medium performing the first refrigeration cycle passes through the small compressor 130. The heat medium flowing into the compressor 130 is compressed at high temperature and high pressure, and passes through the small condenser 132 to exchange heat with the cold water introduced through the water supply pump 119 with the heat medium compressed at high temperature and high pressure, thereby requiring hot water in a bathroom or a factory. It is supplied so that the heat medium exchanged with the cold water is configured to be input back to the auxiliary cooling heat exchanger 122 through the second expansion valve (134).

Since the first refrigeration cycle is branched from the sub-cooling heat exchanger 122 to perform a separate refrigeration cycle, the first refrigeration cycle has a higher degree of cooling than the supercooling of the first refrigeration cycle, and the hot water at a higher temperature during the heat exchange with the cold water is supplied. It can be created. Therefore, the waste heat recovery apparatus of the present invention can have increased thermal efficiency.

In addition, when the waste heat recovery apparatus according to the present invention is used for the use of the bath as shown in FIG. Branching the heat medium through the valve (V) which can be opened and closed between the expansion valve (128) and the evaporator (112) to install a separate cold water supply heat exchanger (140), if necessary, opens the valve (V) By bypassing the heat medium passing through the expansion valve 128 to the cold water supply heat exchanger 140, the heat medium is introduced into the suction pipe heat exchanger 114, the cold water of the bath heat exchanged with the cold water supply heat exchanger 140 to The cooling water can be further reduced.

The heat pump type waste heat recovery apparatus according to the present invention configured as described above is circulated by introducing 30-35 ° C. high temperature wastewater discharged from a bathroom or a factory by the operation of waste hot water discharge pump 110 into the evaporator 112. Heat exchange with the heat medium. The heat medium heat-exchanged with the high temperature wastewater is changed to a state of high temperature and low pressure, and is heat-exchanged through the suction tube heat exchanger 114 for adjusting wet compression prevention and subcooling and entering the compressor 116.

The heat medium introduced into the compressor 116 is compressed to a high temperature and high pressure and flows into the condenser 118, and the cold water introduced from the condenser 118 through the feed water pump 119 and the heat medium compressed to high temperature and high pressure exchange heat. Hot water is supplied from the back.

The heat medium changed into a liquid state by heat exchange with cold water through the condenser 118 is stored in the receiver 120. The receiver 120 is a high pressure container for temporarily storing the heat medium liquefied in the condenser 118 and recovering and storing the refrigerant when the device is stopped. The heat medium passing through the receiver 120 passes through the suction tube heat exchanger 114 again, and heat-exchanges with the heat medium passing through the evaporator 112 to be first supercooled and introduced into the auxiliary cooling heat exchanger 122.

The heat medium flowing into the auxiliary cooling heat exchanger 122 is heat-exchanged with the heat medium performing the second refrigeration cycle, and the heat medium performing the second refrigeration cycle is introduced into the small compressor 130 and compressed at a high temperature and high pressure. While passing through 132, the cold water introduced through the feed water pump 119 is heat-exchanged with the heat medium compressed at high temperature and high pressure to supply hot water necessary in a bathroom or a factory. The heat medium exchanged with the introduced cold water is again inputted to the auxiliary cooling heat exchanger 122 through the second expansion valve 134.

At this time, since the second refrigeration cycle branched from the auxiliary cooling heat exchanger 122 performs a separate refrigeration cycle, the second refrigeration cycle has a cooling degree superior to that of the first refrigeration cycle, and has a higher heat quantity when heat exchanged with cold water being supplied. Can create.

The heat medium of the first freezing cycle, which flows into the auxiliary cooling heat exchanger 122 and heat exchanges with the heat medium that performs the second freezing cycle, passes through the filter 124 and the sight glass 126, and passes through the expansion valve 128. 112).

Therefore, another waste heat recovery apparatus according to the present invention performs the first refrigeration cycle and the second refrigeration cycle by using the heat of the waste water, and receives the cold water from the condenser 118 and the small condenser 132 and raises it above a predetermined temperature. Therefore, the cost of fuel consumption and temperature reduction of waste hot water is reduced.

And, when the waste heat recovery apparatus according to the present invention is used in the bath as shown in FIG. The heat medium branches into the cold water supply heat exchanger 140 through the valve V which can be opened and closed between the expansion valve 128 and the evaporator 112, and if necessary, opens the valve V to expand the expansion valve 128. By passing through the heat medium passing through the cold water supply heat exchanger (140) to the inlet pipe heat exchanger (114), the cold water in the bath heat exchanged with the cold water supply heat exchanger (140) to cool the water further reduced the temperature Can supply

As described above, heat with hot waste hot water flowing out of the bath or factory according to the present invention is heat-exchanged with the heat medium circulating in the first freezing cycle and the second freezing cycle, and the heat obtained therefrom is exchanged with cold water. This increases the efficiency of energy and reduces the cost of waste heat recovery.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited thereto and may be improved or modified by those skilled in the art within the scope of the technical idea of the present invention.

Claims (2)

An auxiliary cooling heat exchanger 122 for heat-exchanging the heat medium for performing the first freezing cycle and the heat medium for performing the second freezing cycle; An expansion valve (128) for receiving the heat medium of the first freezing cycle passed through the auxiliary cooling heat exchanger (122) through a filter (124) and a pressure regulating valve (126) to lower the pressure and temperature of the heat medium; An evaporator 112 for recovering heat of the waste water by heat exchange with the heat medium introduced through the expansion valve 128 and the hot waste water introduced through the waste hot water discharge pump 110; A suction pipe heat exchanger (114) for adjusting the wet compression prevention and supercooling degree of the heat medium introduced from the evaporator (112); A compressor (120) for compressing the heat medium passing through the suction pipe heat exchanger (114) at high temperature and high pressure; A condenser 118 for dissipating hot water by heat-exchanging the high temperature and high pressure heat medium passing through the compressor 120 and the cold water introduced through the feed water pump 119; And a first refrigerating cycle for temporarily storing a liquid heat medium passing through the condenser 118 and circulating the receiver 120 for introducing the stored heat medium into the suction tube heat exchanger 114. A small compressor (130) for compressing the heat medium for performing the first freezing cycle and the heat medium heat exchanged through the auxiliary cooling heat exchanger (122); A small condenser 132 for dissipating hot water by heat-exchanging the heat medium passing through the small compressor 130 with the cold water introduced through the feed water pump 119; By simultaneously performing a second refrigeration cycle to circulate the second expansion valve 134 for flowing into the auxiliary cooling heat exchanger 122 by dropping the temperature and pressure of the heat medium heat exchanged with cold water through the small condenser 132 Heat pump waste heat recovery system for preheating the cold water introduced by using the heat of waste water. The method of claim 1, wherein between the expansion valve 128 and the evaporator 112, a cold water supply heat exchanger 140 for supplying cooling water by heat exchange with the heat medium bypassed through the valve (V) that can be opened and closed is formed Heat pump waste heat recovery device characterized in that the.