JP2005326089A - Absorption refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new composition not needing a radiator for reducing manufacturing costs and miniaturizing the device. <P>SOLUTION: A refrigerant is absorbed by an absorber 5, a bypass pipe 11A wherein an opening and closing valve 9 is intervened is provided such that one part of absorbent conveyed from the absorber 5 to a regenerator 1 by operation of an absorbent pump 8 bypasses a heat exchanger 6 and flows into the high temperature regenerator 1, and a controller 30 is provided for controlling opening and closing of the opening and closing valve 9 on the basis of a temperature of an evaporator outlet side of cold water measured by a temperature sensor 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an absorption refrigerator that uses exhaust heat generated from other equipment as a heat source of a regenerator that evaporates and separates a refrigerant by heating an absorption liquid.

  As this type of apparatus, for example, an absorption refrigerator 100X having the configuration shown in FIG. 4 is well known (for example, see Patent Document 1). In this absorption refrigerator 100X, the refrigerant vapor generated by heating in the high-temperature regenerator 1A dissipates heat and condenses into the cooling water that has passed through the absorber 5 and the condenser 3, and is recirculated as a refrigerant liquid to the high-temperature regenerator 1A. The exhaust heat 35 is provided, and exhaust heat (in this case, high-temperature exhaust gas is supplied) from other equipment (not shown) such as a co-generation system to the high-temperature regenerator 1A through the exhaust heat fluid supply pipe 15 In particular, the refrigerant that is supplied without controlling the amount of heat and is generated by heating in the high-temperature regenerator 1A even if exhaust heat with a heat amount larger than the load of the absorption refrigerator 100X is supplied from the exhaust heat fluid supply pipe 15 to the high-temperature regenerator 1A. This can be dealt with by the steam dissipating heat to the cooling water by the radiator 35.

  In the figure, 1B is a low-temperature regenerator, 2 is a burner that functions as a heat source for the high-temperature regenerator 1A, 4 is an evaporator, 6A is a low-temperature heat exchanger, 6B is a high-temperature heat exchanger, 7 is a refrigerant pump, and 8 is absorbing. A liquid pump, 16 is a cold water pipe through which cold water as brine flows, and 17 is a cooling water pipe.

  However, the absorption refrigerator 100X has a configuration in which excess heat of the exhaust heat is discarded by the separately installed radiator 35, so that the installation cost of the radiator 35 is excessive or a space for that is required. There was a problem that the miniaturization was not possible.

Therefore, in Patent Document 1, the condenser 3 and the absorber 5 are connected via a refrigerant pipe provided with a flow control valve so that the refrigerant liquid condensed in the condenser 3 can be supplied to the absorber 5 or condensed. The refrigerant liquid condensed in the condenser 3 is connected to the low temperature regenerator 1B through a refrigerant pipe provided with a flow control valve so that the refrigerant liquid condensed in the condenser 3 can be supplied to the low temperature regenerator 1B. The condenser 3 and the evaporator 4 are connected via a refrigerant pipe provided with a flow control valve so as to be supplied to the evaporator 4, or the refrigerant liquid in the refrigerant liquid pool of the evaporator 4 is supplied to the absorber 5. Various absorption refrigerators have been proposed in which the evaporator 4 and the absorber 5 are connected through a refrigerant pipe provided with a control valve.
JP 2001-208443 A

  The absorption refrigerator proposed in Patent Document 1 makes it unnecessary to install a radiator. As a result, it has become possible to reduce manufacturing costs and reduce the size of the equipment, but in order to respond to the diverse requirements of customers, the card has as many configurations as possible that do not require the installation of a radiator. It was a problem to be solved.

  In order to solve the above-described problems of the prior art, the present invention is an absorption refrigerator that supplies exhaust heat of other equipment as a heat source to a regenerator that is connected to a condenser, an evaporator, an absorber, etc. to constitute a refrigeration cycle. An absorption liquid heat exchanger for exchanging heat between the absorption liquid flowing from the regenerator to the absorber and the absorption liquid flowing from the absorber to the regenerator is provided, and the absorption liquid flowing from the regenerator to the absorber from the absorber The main feature is that an absorption liquid pipe is provided so that at least one of the absorption liquid flowing into the regenerator can circulate around the absorption liquid heat exchanger.

  In the present invention, when the amount of exhaust heat of other equipment supplied to the regenerator is larger than the amount of heat used in the heat load, the entire apparatus is increased by increasing the amount of absorption liquid circulating around the absorption liquid heat exchanger. The heat efficiency is reduced, and the amount of input heat and the amount of heat consumed are balanced, so that it is not necessary to install a radiator for discarding heat.

  In an absorption chiller that supplies exhaust heat from other equipment as a heat source to a regenerator that is connected to a condenser, evaporator, absorber, etc. to constitute a refrigeration cycle, absorption liquid and absorption that flow into the absorber from the regenerator An absorption liquid heat exchanger for exchanging heat with the absorption liquid flowing into the regenerator from the regenerator, and at least one of the absorption liquid flowing into the absorber from the regenerator and the absorption liquid flowing into the regenerator from the absorber However, it is possible to circulate the absorption liquid heat exchanger so that it can be circulated, and to further reduce the flow rate of the absorption liquid that circulates around the absorption liquid heat exchanger. The absorption refrigerator which provided the control means to control based on the temperature of the brine discharged from.

  A first embodiment of the present invention will be described with reference to FIGS. The absorption refrigerator 100 illustrated in FIG. 1 is a low-temperature water absorption refrigerator that can circulate and supply cold water as brine to a heat load (not shown), water as a refrigerant, and lithium bromide (LiBr) as an absorption liquid. An aqueous solution is used. In order to facilitate understanding, in these drawings, parts having the same functions as those described with reference to FIG.

  1 is a regenerator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, 6 is a heat exchanger, 7 is a refrigerant pump, 8 is an absorption liquid pump, 9 is an on-off valve, and 10 is a three-way valve. , 11 and 12 are absorption liquid pipes, 11A is a bypass pipe, 13 and 14 are refrigerant pipes, 15 is a waste heat fluid supply pipe through which waste heat fluid supplied from other equipment such as a cogeneration system flows, 16 Is a chilled water pipe through which chilled water that is circulated and supplied to a cooling load (not shown) flows, and 17 is a chilled water pipe through which the chilled water flows and are connected to each other as shown in FIG.

  Further, 30 controls the opening / closing of the open / close valve 9 based on the temperature of the cold water measured by the temperature sensor 21 provided on the evaporator outlet side of the cold water pipe 16, and is provided downstream of the three-way valve of the exhaust heat fluid supply pipe 15. It is a controller for controlling the flow path of the three-way valve 10 based on the temperature of the exhaust heat fluid measured by the temperature sensor 22 provided.

  In the absorption refrigerator 100 of the present invention configured as described above, the cooling water is supplied to the absorber 5 and the condenser 3 via the cooling water pipe 17, and the cogeneration system is supplied to the regenerator 1 via the exhaust heat fluid supply pipe 15. When supplying high-temperature exhaust heat fluid such as hot water from other equipment (not shown), the refrigerant vapor evaporated and separated from the rare absorbent and the refrigerant vapor are separated and regenerated, and the concentrated absorption is increased in concentration. The liquid is obtained in the regenerator 1.

  The high-temperature refrigerant vapor generated by evaporating and separating from the absorption liquid in the regenerator 1 enters the condenser 3 provided in parallel with the regenerator 1, and is cooled and condensed by the cooling water flowing in the cooling water pipe 17. It enters the evaporator 4 via the tube 13.

  The refrigerant liquid that has entered the evaporator 4 and accumulated in the refrigerant liquid reservoir is sprayed by the refrigerant pump 7 on the heat transfer pipe 4 </ b> A connected to the cold water pipe 16, and exchanges heat with water supplied through the cold water pipe 16. The water flowing through the heat transfer tube 4A is cooled.

  The refrigerant evaporated in the evaporator 4 enters the absorber 5 and is heated by warm water in the regenerator 1 to evaporate and separate the refrigerant. The absorbed liquid having an increased absorption liquid concentration, that is, the absorption liquid pipe 12 passes through the heat exchanger 6. And is absorbed by the concentrated absorbent dispersed from above.

  The absorption liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 5, that is, the rare absorption liquid, is sent from the absorption liquid pipe 11 to the regenerator 1 via the heat exchanger 6 by the operation of the absorption liquid pump 8.

  When the absorption refrigerator 100 is operated as described above, the cold water cooled by the heat of vaporization of the refrigerant in the heat transfer pipe 4A piped inside the evaporator 4 becomes a cooling load (not shown) via the cold water pipe 16. Since it can be circulated, cooling operation such as cooling can be performed.

  In the absorption refrigerator 100 of the present invention, the flow of the three-way valve 10 is adjusted so that the temperature of the exhaust heat fluid measured by the temperature sensor 22 during the cooling operation falls within a predetermined set temperature, for example, 70 ± 0.5 ° C. The path is controlled by the control means 30.

  That is, for example, as shown in FIG. 2, when the temperature of the exhaust heat fluid measured by the temperature sensor 22 is higher than 70.5 ° C., the three-way valve 10 is opened (the exhaust heat fluid flows through the regenerator 1). The flow path state is opened, and the flow path state that flows without going through the regenerator 1 is closed.) When the temperature is lower than 69.5 ° C., the control means 30 controls the three-way valve 10 to be closed. .

  Further, the opening / closing valve 9 is controlled by the control means 30 so that the temperature of the cold water measured by the temperature sensor 21 falls within a predetermined set temperature, for example, 7 ± 0.5 ° C. That is, for example, as shown in FIG. 3, the on-off valve 9 is closed when the temperature of the cold water measured by the temperature sensor 21 is higher than 7.5 ° C., and the on-off valve 9 is opened when the temperature is lower than 6.5 ° C. Controlled.

  Therefore, for example, since the cooling load is small, the temperature of the cold water recirculated to the evaporator 4 through the cold water pipe 16 is low, and is cooled by the heat of vaporization taken away from the surroundings when the refrigerant evaporates and discharged from the evaporator 4. When the temperature of the cold water measured by the sensor 21 becomes lower than the predetermined 6.5 ° C., the on-off valve 9 is opened, and the flow of the absorbing liquid flowing into the regenerator 1 from the absorber 5 via the bypass pipe 11A. As a result, the amount of heat that is heated by the heat exchanger 6 and flows into the regenerator 1 decreases, so that the temperature of the entire absorbing liquid that flows into the regenerator 1 from the absorber 5 decreases.

  Therefore, the heat is supplied to the regenerator 1 via the exhaust heat fluid supply pipe 15 where the absorption liquid is heated to evaporate and separate the refrigerant, and the temperature of the exhaust heat fluid discharged from the regenerator 1 by regenerating the absorption liquid is lowered. Therefore, the temperature of the exhaust heat fluid measured by the temperature sensor 22 also decreases. For this reason, the three-way valve 10 is opened by the control means 30, and the amount of heat that heats the absorbing liquid by the regenerator 1 to dissipate heat increases.

  That is, in the absorption refrigerator 100 of the present invention, the exhaust heat fluid is reduced by increasing the amount of the absorption liquid that bypasses the heat exchanger 6 and flows into the regenerator 1 from the absorber 5 and decreases the overall thermal efficiency. Since the amount of heat radiated by the regenerator 1 can be increased, the regenerator of the exhaust heat fluid supplied via the exhaust heat fluid supply pipe 15 because the heat load for circulating and supplying the cold water via the cold water pipe 16 is small. 1 is small, and the temperature of the exhaust heat fluid measured by the temperature sensor 22 is higher than a predetermined temperature of 70.5 ° C., the on-off valve 9 opens to bypass the heat exchanger 6 from the absorber 5. The temperature of the exhaust heat fluid measured by the temperature sensor 22 can be lowered to a predetermined temperature range by increasing the amount of the absorbing liquid flowing into the regenerator 1 and reducing the thermal efficiency.

  In addition, since this invention is not limited to the said embodiment, various deformation | transformation implementation is possible in the range which does not deviate from the meaning as described in a claim.

  For example, the on-off valve 9 interposed in the bypass pipe 11A may be a flow rate control valve instead of the on-off valve. When the flow control valve is provided in the bypass pipe 11A instead of the on-off valve, the controller 30 opens the flow control valve so that the temperature of the cold water measured by the temperature sensor 21 becomes a predetermined temperature (for example, 7 ° C.). Configured to control the degree.

  Further, the bypass pipe 11 </ b> A provided with the opening / closing valve 9 may be provided in the absorption liquid pipe 12 so that a part of the absorption liquid flowing into the absorber 5 from the regenerator 1 flows around the heat exchanger 6. .

  Moreover, the absorption refrigerator provided with the high temperature regenerator and the low temperature regenerator, the high temperature heat exchanger, and the low temperature heat exchanger like the absorption refrigerator disclosed by patent document 1 may be sufficient.

  Further, it is possible to provide an open / close valve or a flow control valve in place of the three-way valve 10 at an appropriate portion of the exhaust heat fluid supply pipe 15.

It is explanatory drawing of the absorption refrigerator of this invention. It is explanatory drawing which shows the example of control of a three-way valve. It is explanatory drawing which shows the example of control of an on-off valve. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Regenerator 3 Condenser 4 Evaporator 4A Heat transfer pipe 5 Absorber 6 Heat exchanger 7 Refrigerant pump 8 Absorbent liquid pump 9 On-off valve 10 Three-way valve 11, 12 Absorbent liquid pipe 11A Bypass pipe 13, 14 Refrigerant pipe 15 Exhaust heat fluid Supply pipe 16 Cold water pipe 17 Cooling water pipe 21, 22 Temperature sensor 30 Controller 35 Radiator 100, 100X Absorption refrigerator

Claims (2)

  In an absorption chiller that supplies exhaust heat from other equipment as a heat source to a regenerator that is connected to a condenser, evaporator, absorber, etc. to constitute a refrigeration cycle, absorption liquid and absorption that flow into the absorber from the regenerator An absorption liquid heat exchanger for exchanging heat with the absorption liquid flowing into the regenerator from the regenerator, and absorbing at least one of the absorption liquid flowing into the absorber from the regenerator and the absorption liquid flowing into the regenerator from the absorber An absorption refrigerator, wherein an absorption liquid pipe is provided so that the liquid can circulate around the absorption liquid heat exchanger.   A control means is provided for controlling the flow rate of the absorption liquid circulating around the absorption liquid heat exchanger based on the temperature of the brine discharged from the evaporator after being cooled by the vaporization heat. The absorption refrigerator according to claim 1.

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