KR102375212B1 - District heating and cooling system using constant temperature waste heat - Google Patents

Abstract

The present invention relates to a district cooling and heating facility system using constant temperature waste heat. According to one aspect of the present invention, a heat producer that produces heat to supply a heat source to a first demander is returned from the first consumer to the heat producer. a heat pump that supplies heat to a second consumer by using return water, supplies heat to the second consumer, and transfers the recovered heat to the heat producer; and a desiccant cooling device that receives heat transferred from the heat pump to the heat producer and transfers the heat to a third consumer.

Description

District cooling and heating system using constant temperature waste heat

The present invention relates to a district cooling/heating facility system using constant temperature waste heat, which is efficiently and stably operated using constant temperature waste heat, and is an invention for a district cooling and heating facility system using constant temperature waste heat using heat storage.

A district heating and cooling system is a system in which a group energy supplier supplies group energy to a large number of individual users. Therefore, the district cooling/heating system is a system capable of supplying energy from a heat source facility at once even if a large number of heat receiving destinations, such as residential, commercial and industrial areas, do not have developed heating and cooling facilities.

On the other hand, there is a district cooling and heating system that produces heat of medium temperature (eg, 60°C to 80°C) by using a heat pump to recover waste heat from a data sensor or a site such as a subway station that can use constant-temperature waste heat. Such a district heating and cooling system can increase the temperature of the return water of the collective energy facility by utilizing the waste heat, and also can supply energy to the surrounding medium and low temperature heat demanding places, thereby securing a low heat supply unit cost. In addition, there is an effect of improving the thermal efficiency of the collective energy facility, and at the same time, there is an advantage in that it is possible to secure the amount of heat at a constant temperature throughout the year.

However, in the case of using waste heat to produce medium-temperature heat, it cannot be used in the summer, so a separate heat demand source is required. Also, when the return water is heated in a system that applies cogeneration, the power generation efficiency of cogeneration is rather reduced. There is a problem that can be degraded.

Republic of Korea Patent Registration No. 10-0984831 (2010.09.27)

Embodiments of the present invention were invented in the background as described above, and in order to efficiently and stably operate a collective energy-linked system by using constant temperature waste heat, the surplus heat produced in summer is supplied to additional consumers, and also a separate heat storage tank To provide a district cooling and heating system using constant temperature waste heat in connection with

According to one aspect of the present invention, cold air is supplied to a second consumer by using the return water returned from the first consumer to the heat producer as a heat producer to produce heat in order to supply a heat source to the first consumer, and the a heat pump that transfers heat generated by supplying cold air to a second consumer to the heat producer; and a dehumidification/cooling device receiving the heat transferred from the heat pump to the heat producer and producing and supplying cool air to a third consumer.

It may further include a heat storage tank for receiving and storing at least a portion of the heat transferred from the heat pump to the heat generator.

The heat storage tank may receive and store a portion of the heat supplied to the dehumidifying and cooling device in summer.

The heat storage tank may supply heat stored in the third consumer in winter.

The heat storage tank may store the heat discharged from the heat pump in the changing season.

The desiccant cooling device may receive heat from the heat pump in summer and use latent heat of water to produce and supply cool air to the third consumer.

The heat pump may supply a portion of the heat transferred to the heat producer in winter to the third consumer.

The heat pump may produce and supply a predetermined amount of cold air so that the second consumer can maintain a constant temperature.

According to embodiments of the present invention, compared to the existing collective energy supply system, it is possible to secure a low-cost heat source through a producer capable of producing the same temperature and the same amount of heat throughout the year.

In addition, it can be used as a dehumidifying cooling device in summer or a heat storage heat source in winter, so that the entire system can be efficiently operated by utilizing a heat source that was previously discarded.

Moreover, as the temperature of the return water is increased, there is an effect of reducing the fuel cost of the heat supply facility.

1 is a diagram illustrating a district cooling/heating system using waste heat.
2 is a diagram illustrating a district cooling and heating system according to an embodiment of the present invention.
FIG. 3 is a view for explaining a dehumidifying cooling device for supplying cold air to an added demand point of the district cooling and heating system according to an embodiment of the present invention.
4 is a view for explaining when the district cooling and heating system according to an embodiment of the present invention is used in winter.

Hereinafter, specific embodiments for implementing the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, when it is said that a component is 'connected', 'supported', 'connected', 'supplied', 'transferred', or 'contacted' to another component, it is directly connected, supported, connected, It should be understood that supply, delivery, and contact may occur, but other components may exist in between.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, the expressions of the upper side, the lower side, the side, etc. are described with reference to the drawings, and it is to be noted in advance that if the direction of the corresponding object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

1 to 4, the district cooling and heating system 10 using the constant temperature waste heat of the present invention will be described. The district cooling and heating system 10 uses a heat pump 300 for a customer that requires heat for cooling. The district heating/cooling system 10 includes a heat producer 100 , a first consumer 200 , a heat pump 300 , a data sensor, a heat storage tank 500 , and a third consumer 600 .

The heat producer 100 may use combined heat and power (CHP) or a boiler. Cogeneration generates heat and electricity by using natural gas or the like as a fuel resource. Such cogeneration may have an energy efficiency of up to 90%, and energy costs may be reduced compared to a separate heat and electricity production system.

The boiler produces hot water for district heating.

The first demand 200 is a demand that uses the heat produced by the heat producer 100 , and receives the heat produced by the heat producer 100 . The first consumer 200 may be an industrial facility such as a factory where district cooling and heating is performed, or an existing general commercial facility or residential facility.

The heat pump 300 is provided to receive the return water returned from the first consumer 200 and supply it to the second consumer 400 . The heat pump 300 receives the return water returned from the first consumer 200 , and supplies cold air, which has lowered the temperature, to the second consumer 400 , raises the temperature of the return water and supplies it back to the heat producer 100 . there is.

The heat pump 300 may include an evaporator 310 , a condenser 320 , an expansion valve 330 , and a compressor 340 .

The evaporator 310 is one of the devices for exchanging heat, and includes a plurality of pipes for heat exchange with the refrigerant, and the refrigerant may circulate through the plurality of pipes. In addition, a refrigerant to be cooled is disposed outside the plurality of pipes to be cooled, and the cooled refrigerant may be supplied to the second consumer 400 .

The condenser 320 condenses the refrigerant cooled by the evaporator 310 and serves to increase the temperature of the return water by using the refrigerant supplied from the evaporator 310 through the compressor 340 .

The expansion valve 330 expands the refrigerant moving from the condenser 320 toward the evaporator 310 .

The compressor 340 compresses the refrigerant moving from the evaporator 310 to the condenser 320 .

The heat pump 300 may supply return water having a temperature of about 55° C. to the heat producer 100 by increasing the temperature to about 80° C. Accordingly, the number of return returned to the heat producer 100 may be increased from about 55°C to about 60°C.

In addition, the heat pump 300 may supply heat at a temperature of about 15° C. to the second demand source 400 , and heat of about 25° C. may be recovered from the second demand source 400 .

The second consumer 400 may use waste heat at a constant temperature, and may demand heat at a constant temperature, such as a data center or subway station.

The second consumer 400 may be a data center where a number of servers are installed and need to be continuously cooled, or a subway station where it is necessary to maintain a constant temperature. Accordingly, the second demand 400 may have a constant temperature range in all four seasons by maintaining a constant temperature throughout the year.

The heat storage tank 500 stores heat therein, and in the present embodiment, may store heat therein. The heat storage tank 500 may store heat by using water. The heat storage tank 500 may store the heat produced through solar power generation or commercial systems in the season when power demand is low. That is, the heat storage tank 500 may be a quarterly heat storage tank.

The third demand source 600 may be a group facility different from the first demand source 200 . In the case of summer, heat for dehumidification cooling may be supplied to the third consumer 600 . The third demand source 600 may receive a cooling heat source in summer, and the return water having a temperature of about 55° C. to 80° C. returned from the first demand source 200 can be utilized through dehumidification cooling. To this end, the third consumer 600 may include a desiccant cooling device 605 .

The desiccant cooling device 605 utilizes the latent heat of evaporation of water. For this purpose, the desiccant cooling device 605 may include a condenser 610 , a heat exchanger 620 , a dehumidification rotor 630 , an evaporative cooler 640 , and an evaporator 650 for dehumidification cooling.

As shown in FIG. 3, the desiccant cooling device 605 has two channels, and the first channel has an evaporative cooler 640 and an evaporator 650 installed sequentially from the bottom to the top, and the second channel The condenser 610 and the heat exchanger 620 are installed sequentially from the top to the bottom direction.

And the dehumidification rotor 630 is disposed through two channels at the bottom of the evaporative cooler 640 and the heat exchanger 620 . The first channel may be disposed on the left side, and the second channel may be disposed on the right side.

In addition, the heat exchanger 620 may receive heat from the heat pump 300 or the heat storage tank 500 , and the heat discharged from the heat exchanger 620 may be discharged to the heat producer 100 or the heat storage tank 500 side. .

Indoor air and outdoor air are supplied from the lower end of the first channel, and the air introduced into the first channel of the dehumidifying/cooling device 605 may move upward and be discharged into the room from the uppermost end.

In addition, outside air is supplied from the upper end of the second channel, and the air introduced into the second channel of the dehumidifying/cooling device 605 may move downward and be discharged to the outside at the lowermost end.

In the dehumidification cooling device 605 , high temperature and high humidity indoor air and outdoor air are sucked in for dehumidification cooling, and are dehumidified while passing through the dehumidification rotor 630 , and the high temperature and high humidity indoor air is converted into dry air. Then, the dry air passed through the evaporative cooler 640 and dried in the dehumidifying rotor 630 may be cooled to about 20°C.

In addition, the cold air may be supplied back into the room through the evaporator 650 to supply the cold air to the third consumer 600 . At this time, the air is cooled in the evaporative cooler 640 through the heat exchanger 620 using the return water supplied from the heat pump 300 , and outside air is sucked through the dehumidification rotor 630 to remove moisture or odors. and can be ejected.

As described above, cold air may be supplied to the third consumer 600 by using the return water returned from the first consumer 200 in the summer through the dehumidifying and cooling device 605 as described above.

In the summer season, heat may be supplied to the first consumer 200 that requires some heat, and heat returned from the first consumer 200 may be recovered. In this case, when the heat is not sufficiently used in the first demand 200 , the heat may be radiated through the cooling tower.

As shown in FIG. 1 , when the second demand source 400 is connected through the heat pump 300 in the case of cooling at a constant temperature, as shown in FIG. 1 , the number of returns returned to the heat supply source. The temperature may rise by about 5°C. In this case, when the heat generating source 100 is a system such as cogeneration, power generation efficiency may be lowered, and economic feasibility may be lowered if a demand source that can be utilized is not secured even after arrangement.

Moreover, since the temperature of the return water returned from the first consumer 200 or the return water recovered from the heat pump 300 in summer is about 60° C. to 80° C., it is not easy to utilize such return water. Accordingly, as shown in FIG. 2 , the number of return may be used through the third demander 600 .

The third customer 600 may use dehumidification cooling through the desiccant cooling device 605 , and thus return water may be used as a heat source for dehumidification cooling.

In this case, when the demand for cooling from the third demand source 600 is insufficient, the remaining thermal energy may be supplied to the heat storage tank 500 and stored. In this way, the waste of heat can be minimized.

In addition, in the case of interseasonal seasons other than summer, except when some cooling demand or heating demand occurs, the heat of about 80 ℃ produced through the second demand source 400 and discharged from the heat pump 300 is stored in the heat storage tank 500 ) can be stored in In addition, the return water whose temperature is lowered in the heat storage tank 500 may be supplied to the heat producer 100 .

And in the case of the winter season, as shown in FIG. 4 , the heat of about 110 ℃ produced by the heat producer 100 is supplied to the first demand 200 , and the temperature of about 55 ℃ returned from the first demand 200 . heat can be recovered.

The third consumer 600 may receive the heat stored in the heat storage tank 500 , and when the heat in the heat storage tank 500 is insufficient, the heat produced through the heat pump 300 is transferred to the third consumer 600 . can supply And the heat recovered from the third demand source 600 may be recovered to the heat producer 100 .

In the district cooling and heating equipment system 10 in this embodiment, the size of the district heating and cooling equipment market tends to be in a trend in which facility investment is expected to be continuously input over the next several years. Therefore, it is possible to reduce the amount of energy used annually compared to the existing system. That is, it is possible to continuously supply a low-cost heat source to the second consumer 400 that consumes heat at the same temperature per year.

In addition, the district cooling and heating system 10 can be operated more efficiently by supplying a heat source that has not been used again and wasted to the third consumer 600 or storing it in the heat storage tank 500 for later use.

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed as having the widest scope according to the embodiments disclosed herein. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

10: District cooling and heating system
100: heat producer 200: first consumer
300: heat pump
310: evaporator 320: condenser
330: expansion valve 340: compressor
400: second consumer 500: heat storage tank
600: third demand
605: dehumidification cooling device 610: condenser
620: heat exchanger 630: dehumidification rotor
640: evaporative cooler 650: evaporator

Claims (8)

a heat producer that produces heat to supply a heat source to the first demand;
Heat that supplies a cooled fluid to a second consumer by using the return water returned from the first consumer to the heat generator, and transfers heat generated by supplying the cooled fluid to the second consumer to the heat generator Pump;
a dehumidification cooling device receiving the heat transferred from the heat pump to the heat producer and producing and supplying the cooled fluid to a third consumer; and
and a heat storage tank for receiving and storing at least a portion of the heat transferred from the heat pump to the heat producer;
The desiccant cooling device supplies heat generated by supplying the cooled fluid to the third demand source to one of the heat producer and the heat storage tank according to the season,
The heat storage tank supplies the heat stored in the heat storage tank to one of the heat producer and the third consumer depending on the season,
District cooling and heating system. delete The method of claim 1,
The heat storage tank receives and stores a portion of the heat supplied to the dehumidifying cooling device in the summer season,
District cooling and heating system. The method of claim 1,
The heat storage tank supplies heat stored in the third consumer in winter,
District cooling and heating system. The method of claim 1,
The heat storage tank to store the heat discharged from the heat pump in the changing season,
District cooling and heating system. The method of claim 1,
The desiccant cooling device receives heat from the heat pump in summer and supplies the cooled fluid to the third demand by using the latent heat of water.
District cooling and heating system. The method of claim 1,
The heat pump supplies a portion of the heat transferred to the heat producer in winter to the third consumer,
District cooling and heating system. The method of claim 1,
The heat pump supplies a predetermined cooled fluid so that the second demander can maintain a constant temperature,
District cooling and heating system.

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