KR20190115694A - Hybrid heating system using absorption chiller/heater - Google Patents

Abstract

The present invention relates to an absorption chiller-heater and, more specifically, relates to a hybrid heating system using an absorption chiller-heater, which is operated with a cooling cycle in case of heating, and uses waste heat and geothermal heat to input water at 12°C into an evaporator to raise a temperature of refrigerant. Moreover, cooling water at about 45°C discharged to a cooling tower in a condenser via an absorber is supplied to an indoor unit to perform heating. Therefore, the whole COP is more than 1.8 (180%) in which 0.9 COP of the waste heat and the geothermal heat is added to 0.9 COP of gas heat to maximize energy efficiency.

Description

HYBRID HEATING SYSTEM USING ABSORPTION CHILLER / HEATER}

The present invention relates to an absorption type cold and hot water heater, and in particular, is operated in a cooling cycle during heating. The waste heat and geothermal heat is used to inject water at 12 ° C. into an evaporator to raise the refrigerant, and then discharge the condenser from the condenser to the cooling tower. Hybrid heating using absorption type hot and cold water heater that maximizes energy efficiency because the total COP is 1.8 (180%) by adding waste heat and geothermal COP 0.9 to COP 0.9 of gas heat by heating by supplying cooling water of ℃ to indoor unit. It's about the system.

Generally, absorption type cold and hot water machine refers to a system for cooling and cooling a room through cooling and cooling cycles of absorption liquid and water using LPG, LNG, and diesel as fuel.

As shown in FIG. 1, the conventional absorption chiller water heater 10 includes a gas burner 11, a regenerator 12, a condenser 13, an absorber 14, and an evaporator 15. An air conditioner or fan coil unit installed in the indoor unit 16, a conveying pump 18 provided in the circulation pipe 17 connecting the evaporator 15 and the indoor unit 16, and a condenser ( It consists of a cooling tower 19 for cooling the cooling water discharged from 13) is supplied to the absorber 14 and circulated.

The absorption type cold and hot water heater 10 vaporizes a portion of the absorption solution in the regenerator 12 by using the gas burner 11 to cool it, and vaporizes the vaporized refrigerant vaporized in the regenerator 12 in the condenser 13 during cooling. And a refrigerant circulation cycle for evaporating the liquefied refrigerant condensed in the condenser 13 at low pressure, and absorbing the gas refrigerant evaporated in the evaporator 15 in the absorber 14, and circulating with the evaporation heat generated in the evaporator 15. The cooling water of the pipe 17 is cooled.

The cooling water of the circulation pipe 17 cooled by the evaporator 15 is circulated to the indoor unit 16 installed in the room by the operation of the conveying pump 18 to perform the cooling of the room.

As shown in FIG. 2, the absorption cold / hot water heater 10 directly sends the refrigerant vapor heated to a high temperature in the regenerator 12 to the evaporator 15 through the opening of the cooling / heating switching valve V during heating. The heating water of the furnace circulation pipe 17 is heated, and the heated water thus circulated to the indoor unit 16 along the circulation pipe 17 by the operation of the conveying pump 18 to perform the heating of the room. Done.

However, the absorption type cold and hot water heater has a problem in that energy efficiency is lowered because COP (Coefficient Of Performance) is 0.9 or less since heating is performed by gas heat generated from a gas burner.

In this regard, a hybrid absorption type cold and hot water machine was developed, which was registered in Korea Patent Publication No. 10-1699905 (absorption refrigeration system having a fuel cell), No. 10-1634345 (absorption cooling system using waste heat of a compression refrigerator), No. 10-0971179 (Hot water supply and hot water heating apparatus using a mixture of the regenerator exhaust heat of the absorption type cold and hot water heater and the heat source of the steam boiler) and the like are disclosed.

However, such a hybrid type of cold and hot water heater also has a problem that the energy efficiency is lowered because the COP (Coefficient Of Performance) is 0.9 (90%) or less since heating is performed by the gas heat generated from the gas burner during heating.

(Prior art 01) Domestic Patent Publication No. 10-1699905 (Advanced Technology 02) Domestic Patent Publication No. 10-1634345 (Advanced Technology 03) Domestic Patent Publication No. 10-0971179

The present invention is to solve the above problems, while operating in a cooling cycle during heating, by using the waste heat and geothermal heat to 12 ℃ water to the evaporator to increase the temperature of the refrigerant, through the absorber and discharged from the condenser to the cooling tower It is an object of the present invention to provide a hybrid heating system using an absorption cold / hot water machine to supply 45 ° C. cooling water to an indoor unit to perform heating.

Features of the present invention for achieving the above object,

Transfer unit installed in the gas unit, the regenerator, the condenser, the absorber, the evaporator, the indoor unit comprising an air conditioner or a fan coil unit installed in the room, and a circulation pipe connecting the evaporator and the indoor unit. In an absorption type hot and cold water heater comprising a pump and a cooling tower for cooling the cooling water discharged from the condenser and supplying and circulating the cooling water to the absorber, one end is heat exchanged inside the regenerator, and the refrigerant is filled therein and the refrigerant is circulated by the circulation pump. A circulation circulation pipe for heating; An underground heat exchanger tube installed in the ground to heat and circulate the refrigerant in the heating circulation pipe by geothermal heat; A waste heat heat exchanger tube installed in a wastewater tank in which building wastewater is collected and configured to heat and circulate the refrigerant of the heating circulation pipe by waste heat; A heating water supply pipe configured to supply the cooling water discharged from the condenser to the cooling tower to the indoor unit to perform heating; A heating water recovery pipe for supplying cooling water discharged from the indoor unit to the absorber; A first three-way valve installed between the heating water supply pipe and the indoor unit to change a flow path during cooling and heating; And a second three-way valve installed between the heating water recovery pipe and the indoor unit to change a flow path during cooling and heating.

Here, the hybrid heating system using the absorption cold and hot water heater is operated in a cooling cycle during heating, the circulation pump is operated to raise the refrigerant at 7 ℃ to 12 ℃ by using waste heat and geothermal heat to put into the evaporator to circulate, A conveying pump is operated, and the first and second three-way valves are opened and closed to form a flow path of cooling water from the condenser through the indoor unit to the absorber to supply 45 ° C. cooling water discharged from the condenser to the cooling tower to the indoor unit. Heating is performed, and 40 ° C. cooling water discharged from the indoor unit is supplied to the absorber to circulate the cooling water heated to 45 ° C. while passing through the absorber and the condenser.

Here, the heating water recovery pipe is installed at the rear end of the conveying pump so that the cooling water discharged from the indoor unit is circulated by the conveying pump.

Here, in the hybrid heating system using the absorption chiller, the circulation pump is inoperative when the air is cooled, and the first and second three-way valves are opened and closed to form the absorber via the cooling tower in the condenser and operate in a cooling cycle.

According to the hybrid heating system using the absorption type cold and hot water heater of the present invention configured as described above, while operating in a cooling cycle during heating, by using the waste heat and geothermal heat 12 ℃ water is introduced into the evaporator to increase the refrigerant, and through the absorber cooling tower in the condenser By supplying the cooling water of about 45 ℃ discharged to the indoor unit to perform the heating, the total COP is more than 1.8 (180%) of COP 0.9 of the gas heat plus waste heat and COP 0.9 of geothermal heat can be maximized.

1 and 2 is a system diagram showing the configuration of a conventional absorption chiller.
3 is a system diagram showing the configuration of a hybrid heating system using an absorption type cold and hot water heater according to the present invention.
4 is an operation explanatory diagram for explaining the operation during heating of the hybrid heating system using the absorption type cold and hot water heater according to the present invention.
5 is an operation explanatory diagram for explaining the operation during cooling of the hybrid heating system using the absorption chiller according to the present invention.

Hereinafter, the configuration of the hybrid heating system using the absorption type cold and hot water heater according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

3 is a system diagram showing the configuration of a hybrid heating system using an absorption type cold and hot water heater according to the present invention.

Referring to FIG. 3, the hybrid heating system 1 using the absorption chiller according to the present invention includes an absorption chiller 10, a heating circulation tube 20, a geothermal heat exchanger 30, and a waste heat exchanger 40. ), A heating water supply pipe 50, a heating water recovery pipe 60, and a first three-way valve 70 and a second three-way valve 80.

First, the absorption chiller 10 is composed of a gas burner 11, a regenerator 12, a condenser 13, an absorber 14, and an evaporator 15 in the same configuration as that shown in FIG. , An indoor unit 16 including an air conditioner or a fan coil unit installed indoors, a conveying pump 18 installed in a circulation pipe 17 connecting the evaporator 15 and the indoor unit 16, It consists of a cooling tower 19 for cooling the cooling water discharged from the condenser 13 to supply to the absorber 14 to circulate. At this time, the absorption chiller 10 may be applied to single-effect, dual-effect, one-stage, two-stage absorption chiller.

In addition, one end of the heating circulation tube 20 is installed inside the regenerator so as to exchange heat, and the refrigerant is filled therein so that the refrigerant is circulated by the circulation pump 21. In this case, water may be used as the refrigerant, or brine may be used, and the flow path of the circulation pump 21 is controlled by a controller (not shown) that controls cooling and heating.

In addition, the underground heat exchanger tube 30 is installed in the ground to raise and circulate the refrigerant in the heating circulation tube 20 by geothermal heat (ground water).

In addition, the waste heat heat exchanger tube 40 is installed in a waste water tank in which building wastewater is collected in a coil form, and heats the refrigerant of the circulation pipe 20 for heating the waste heat to circulate.

Subsequently, the heating water supply pipe 50 supplies the cooling water (ie, the heating water) discharged from the condenser 13 to the cooling tower 19 to the indoor unit 16.

Subsequently, the heating water recovery pipe 60 supplies the cooling water (that is, the heating water) discharged from the indoor unit 16 to the absorber 14. At this time, the heating water recovery pipe 60 is preferably installed at the rear end of the conveying pump 18 so that the cooling water discharged from the indoor unit 16 is circulated by the conveying pump 18.

In addition, the first three-way valve 70 is installed between the heating water supply pipe 50 and the indoor unit 16 to vary the flow path during cooling and heating. At this time, the first three-way valve 70 is controlled by the controller, the flow path is variable.

In addition, the second three-way valve 80 is installed between the heating water recovery pipe 60 and the indoor unit 16 to vary the flow path during cooling and heating. At this time, the second three-way valve 80 is controlled by the controller, the flow path is variable.

Hereinafter, the operation of the hybrid heating system using the absorption type cold and hot water heater according to the present invention will be described in detail with reference to the accompanying drawings.

"heating"

4 is an operation explanatory diagram for explaining the operation during heating of the hybrid heating system using the absorption type cold and hot water heater according to the present invention.

First, during heating, the absorption cold / hot water heater 10 is operated in a cooling cycle, and the flow path between the first three-way valve 70 and the second three-way valve 80 is controlled so that the flow path of the cooling water is transferred from the condenser 13 to the indoor unit 16. It is opened and closed so as to form an absorber 14.

At the same time, the circulation pump 21 is operated to circulate the refrigerant in the heating circulation pipe 20 so as to pass through the geothermal heat exchange tube 30 and the waste heat heat exchange tube 40 while the refrigerant having a temperature of 7 ° C. is 12 ° C. due to waste heat and geothermal heat. Increase the temperature. At this time, since the flow path is changed by the first three-way valve 70 and the second three-way valve 80 even when the conveying pump 18 installed in the circulation pipe 17 is operated, the refrigerant is not introduced into the evaporator 15 and the heat exchange is performed. This will not be done.

Meanwhile, the absorption solution is heated in the regenerator 12 using the gas burner 11 to vaporize a part thereof, and the vaporized refrigerant vaporized in the regenerator 12 is condensed in the condenser 13 and condensed in the condenser 13. Liquefied refrigerant is evaporated under low pressure.

In addition, the gas refrigerant evaporated in the evaporator 15 has a refrigerant circulation cycle that is moved to and absorbed by the absorber 14, and the refrigerant in the heating circulation pipe 20 is cooled by the evaporation heat generated by the evaporator 15.

That is, the refrigerant in the heating circulation pipe 20 moved to the evaporator 15 side is liquefied refrigerant condensed in the condenser 13 is dropped to the top of the evaporator 15, the heat exchange is cooled to 7 ℃ and continuously circulated and heated And cooling will be repeated.

In addition, 45 ° C. cooling water discharged from the condenser 13 is used as heating water, and 45 ° C. cooling water discharged from the condenser 13 is heated through the heating water supply pipe 50 and the first three-way valve 70. Cooling water supplied to the unit 16, the cooling water discharged from the indoor unit 16, that is, the heating water is supplied to the absorber 14 and heat-exchanged while passing through the absorber 14 and the condenser 13 to raise the temperature to 45 ℃ Allow it to circulate. At this time, the cooling tower 19 is inoperative to save energy.

In addition, the reason why the cooling water at 45 ℃ can be used as the heating water is because the cooling rate is the same as in the past due to the improvement of insulation performance of the insulation materials and windows, but the heating rate is gradually decreasing. Also can bear enough heating load.

"cooling"

5 is an operation explanatory diagram for explaining the operation during cooling of the hybrid heating system using the absorption type cold and hot water heater according to the present invention.

When cooling, the circulation pump 21 is inoperative, and the first and second three-way valves 70 and 80 are opened and closed to form the absorber 14 through the cooling tower 19 in the condenser 13 to operate in the same cooling cycle as in the prior art. Let's do it.

That is, the absorption solution in the regenerator 12 is heated using the gas burner 11 to vaporize a part thereof, and the vaporized refrigerant vaporized in the regenerator 12 is condensed in the condenser 13, and condensed in the condenser 13. The liquefied refrigerant evaporated under low pressure, and has a refrigerant circulation cycle for absorbing the gas refrigerant evaporated in the evaporator 15 in the absorber 14, the cooling water of the circulation pipe 17 by the evaporation heat generated in the evaporator 15 To cool.

The cooling water of the circulation pipe 17 cooled by the evaporator 15 is circulated to the indoor unit 16 installed in the room by the operation of the conveying pump 18 to perform the cooling of the room.

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

10: absorption cold and hot water heater 20: heating circulation pipe
30: geothermal heat exchanger tube 40: waste heat exchanger tube
50: heating water supply pipe 60: heating water recovery pipe
70, 80: first and second three-way valve

Claims (4)

Carrier installed in the gas burner, the regenerator, the condenser, the absorber, the evaporator, the indoor unit comprising an air conditioner or fan coil unit installed in the room, and the circulation pipe connected between the evaporator and the indoor unit. In the absorption type cold water heater comprising a pump and a cooling tower for cooling the cooling water discharged from the condenser to supply to the absorber and circulate.
A heating circulation tube installed at one end of the regenerator to exchange heat, and having a refrigerant filled therein to circulate the refrigerant by a circulation pump;
An underground heat exchanger tube installed in the ground to heat and circulate the refrigerant of the heating circulation tube by geothermal heat;
A waste heat heat exchanger tube installed in a wastewater tank in which building wastewater is collected and configured to heat and circulate the refrigerant in the heating circulation pipe by waste heat;
A heating water supply pipe for supplying cooling water discharged from the condenser to the cooling tower to the indoor unit to perform heating;
A heating water recovery pipe for supplying cooling water discharged from the indoor unit to the absorber;
A first three-way valve installed between the heating water supply pipe and the indoor unit to change a flow path during cooling and heating; And
And a second three-way valve installed between the heating water recovery pipe and the indoor unit to change a flow path during cooling and heating. The method of claim 1,
Hybrid heating system using the absorption chiller,
While operating in a cooling cycle during heating, the circulation pump is operated to raise the refrigerant at 7 ° C. to 12 ° C. by using waste heat and geothermal heat, inject it into the evaporator to circulate, and the conveying pump is operated. A valve is opened and closed to form a flow path of cooling water through the indoor unit through the indoor unit to the absorber, thereby supplying 45 ° C. cooling water discharged from the condenser to the cooling tower to the indoor unit to perform heating, and discharged from the indoor unit. And 40 ° C. cooling water is supplied to the absorber to circulate the cooling water heated to 45 ° C. while passing through the absorber and the condenser. The method of claim 1,
The heating water recovery pipe,
And a cooling water discharged from the indoor unit is installed at a rear end of the conveying pump such that the cooling water is circulated by the conveying pump. The method of claim 1,
Hybrid heating system using the absorption chiller,
The circulation pump is inoperative during cooling, the first and second three-way valve is opened and closed so as to form the absorber through the cooling tower in the condenser is operated in a cooling cycle, characterized in that the hybrid heating system using the absorption chiller.