KR101167800B1 - Absorption type refrigerating machine - Google Patents

Abstract

[PROBLEMS] To provide an absorption chiller that can operate stably even when the temperature of the cooling water is low.
[Resolution] A high temperature regenerator 5, a low temperature regenerator 6, an evaporator 1, a condenser 7 and an absorber 2 are provided, and the high temperature regenerator 5 and the condenser 7 are connected to the low temperature regenerator 6; A flow path resistance means 41 for connecting a flow path resistance to the coolant pipe 31 and a bypass pipe 42 for bypassing the flow path resistance means 41. In the absorption type refrigerator (100) in which the on-off valve (43) is provided in the bypass pipe (42), the cooling water pipe (15) for circulating the cooling water in the absorber (2) and the condenser (7) in turn is provided. And a valve control means for installing a coolant temperature sensor 62 for measuring the temperature of the coolant at the absorber inlet side of the coolant pipe 15 and controlling the on / off valve 43 according to the measurement result of the coolant temperature sensor 62 ( 50).

Description

Absorption Chiller {ABSORPTION TYPE REFRIGERATING MACHINE}

The present invention relates to an absorption chiller having a damper in a refrigerant pipe for sending refrigerant from a high temperature regenerator to a condenser.

Background Art [0002] An absorption chiller has been known in which a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber are provided, and pipes are connected to each other to form circulation paths of the absorbent liquid and the refrigerant (see, for example, Patent Document 1). In this absorption chiller, the high temperature regenerator and the condenser are connected by a heat exchanger pipe connected to the absorption liquid holding part of the low temperature regenerator and a refrigerant pipe via the refrigerant drain heat recovery machine. The refrigerant vapor heated in the high temperature regenerator and separated from the absorbent liquid is condensed in the process of circulating the refrigerant pipe to form the refrigerant liquid, and the refrigerant liquid moves in the refrigerant tube by the differential pressure between the high temperature regenerator and the condenser. In order to lower the flow rate of the refrigerant flowing through the refrigerant pipe and to sufficiently heat the absorbent liquid in the low temperature regenerator or the rare absorbent liquid from the absorber by the heat of the refrigerant vapor from the high temperature regenerator, the refrigerant pipe is provided on the downstream side of the refrigerant drain heat recovery machine. Flow resistance means, such as a flow control valve or an orifice, which provides flow resistance, is provided.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2003-287315

By the way, the absorption chiller improves the COP (Coefficient Of Performance) as the temperature (cooling water inlet temperature) of the cooling water supplied to the absorption chiller decreases. However, when the cooling water inlet temperature is lower than the arbitrary temperature, the differential pressure between the high temperature regenerator and the condenser decreases due to the pressure drop of the high temperature regenerator. Therefore, when the flow path resistance means is provided as in the conventional absorption chiller, the fluidity of the refrigerant Lowers. When the fluidity of the coolant liquid decreases, the coolant liquid gathers near the low temperature regenerator of the coolant tube, or the coolant liquid passes through the low temperature regenerator in the coolant tube. This becomes unstable, and furthermore, there is a fear that hunting at which the temperature at the outlet side of the brine to be supplied to the heat load is changed up and down repeatedly occurs.

This invention is made | formed in view of the above-mentioned situation, and an object of this invention is to provide the absorption type refrigerator which can operate stably even if the temperature of cooling water is low.

In order to achieve the above object, the present invention includes a high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, and connects the high temperature regenerator and the condenser in a refrigerant pipe via the low temperature regenerator, and provides flow resistance to the refrigerant pipe. In an absorption chiller provided with a flow path resistance means for bypassing the flow path resistance means, and a bypass tube provided with an on-off valve in the bypass pipe, a cooling water pipe for circulating coolant sequentially to the absorber and the condenser. And a coolant temperature sensor for measuring the temperature of the coolant at the inlet side of the coolant pipe, and having valve control means for controlling the on / off valve according to the measurement result of the coolant temperature sensor. .

In the above configuration, the valve control means may develop the on-off valve when the temperature measured by the coolant temperature sensor is equal to or less than the first temperature.

In the above configuration, the valve control means may close the on / off valve when the temperature measured by the coolant temperature sensor reaches a second temperature higher than the first temperature.

And a heat input amount control valve for controlling the heat input amount of the high temperature regenerator in the above configuration, wherein the valve control means is adapted to the measurement result of the coolant temperature sensor and the opening degree of the heat input value control valve. The on-off valve may be controlled accordingly.

In the above configuration, the refrigerant pipe downstream of the low temperature regenerator is provided with a refrigerant drain heat recovery device for performing heat exchange between the refrigerant flowing through the refrigerant pipe and the rare water flowing through the rare absorbing liquid pipe extending from the absorber. The high temperature regenerator is provided with a pressure sensor for detecting the pressure in the high temperature regenerator, and a refrigerant temperature sensor for measuring the temperature of the coolant at the outlet of the coolant drain heat recovery unit of the coolant pipe is installed. The on-off valve may be controlled according to the measurement result of the sensor, the detection result of the pressure sensor, and the measurement result of the refrigerant temperature sensor.

According to the present invention, a coolant pipe for circulating the coolant in turn is installed in the absorber and the condenser, and a coolant temperature sensor for measuring the temperature of the coolant is installed on the absorber inlet side of the coolant pipe, and is opened and closed according to the measurement result of the coolant temperature sensor. Since the valve control means for controlling the valve is provided, for example, when the coolant temperature is low, the on / off valve is controlled so as to increase the amount of refrigerant flowing through the bypass pipe, so that the refrigerant in the refrigerant pipe can be easily flowed. The absorption chiller can be operated stably.

1 is a schematic configuration diagram of an absorption chiller according to a first embodiment of the present invention.
2 is a view for explaining the control of the on-off valve.
3 is a schematic configuration diagram of an absorption chiller according to a third embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

[First Embodiment]

1 is a schematic configuration diagram of an absorption chiller according to a first embodiment.

The absorption chiller 100 is a dual-efficiency absorption chiller that uses water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorption liquid. As shown in FIG. 1, the absorption chiller 100 includes an evaporator 1, an absorber 2 provided in the evaporator 1, and an evaporator absorber body in which these evaporators 1 and an absorber 2 are accommodated. (3), a high temperature regenerator 5 having a gas burner 4, a low temperature regenerator 6, a condenser 7 provided in the low temperature regenerator 6, these low temperature regenerators 6 and a condenser Low temperature regenerator condenser body (8), low temperature heat exchanger (12), high temperature heat exchanger (13), refrigerant drain heat recovery unit (16), rare water pump (P1), I) The absorption liquid pump P2 and the refrigerant pump P3 are provided, and each of these devices is connected to each other through the absorption liquid pipes 21 to 25, the refrigerant pipes 31 to 35, and the like.

Reference numeral 14 denotes a cold / hot water pipe for circulating and supplying brine heat-exchanged with the refrigerant in the evaporator 1 to a heat load (for example, an air conditioner) (not shown). The heat exchanger tube 14A formed in a part of is disposed in the evaporator 1. The temperature sensor 61 which measures the temperature of the brine which distribute | circulates the inside of the said cold / hot water pipe 14 is provided in the heat-transfer pipe 14A downstream of the cold / hot water pipe 14. Reference numeral 15 denotes a cooling water pipe for circulating the cooling water sequentially in the absorber 2 and the condenser 7, and each of the heat transfer pipes 15A and 15B formed in a part of the cooling water pipe 15 are respectively the absorber 2 and the condenser ( 7) is arranged in. Reference numeral 50 denotes a controller in charge of controlling the entire absorption type refrigerator 100. The temperature sensor 61 outputs the measurement result to the control device 50 under the control of the control device 50.

The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorbent liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. In the lower part of the absorber 2, a rare absorbing liquid pool 2A in which the rare absorbing liquid diluted with the refrigerant vapor is accumulated is formed, and the rare absorbing liquid pool 2A is controlled in a variable frequency by an inverter 51. One end of the rare water absorption pipe 21 provided with the rare water absorption pump P1 is connected. The rare water absorbing liquid pipe 21 branches into the first rare water absorbing liquid pipe 21A and the second rare water absorbing liquid pipe 21B on the downstream side of the rare water absorbing liquid pump P1, and the first rare water absorbing liquid pipe 21A is a refrigerant drain heat recovery. Via the group 16, the second rare water absorbing tube (21B) is again joined via the low temperature heat exchanger (12). The other end of the rare water absorbing tube 21 is branched into the third rare water absorbing tube 21C and the fourth rare water absorbing tube 21D, and the third rare water absorbing tube 21C passes through the high temperature heat exchanger 13. Subsequently, the base layer portion 5B positioned above the heat exchanger portion 5A formed in the high temperature regenerator 5 is opened, and the fourth rare water absorbing liquid tube 21D is the base layer portion 6A formed at the upper portion of the low temperature regenerator 6. ) Is open.

The lower part of the high temperature regenerator 5 is provided with an igniter 4A for igniting with a fuel such as city gas, for example, and a fuel control valve (heat input value control valve) 4B for controlling the fuel amount to vary the heat source amount. The gas butter 4 is accommodated. When the gas burner 4 receives the combustion signal output from the control device 50, the gas burner 4 burns the gas, and the opening degree of the fuel control valve 4B is measured by the temperature sensor 61 by the control device 50. It is controlled according to. In the high temperature regenerator 5, a heat exchanger 5A is formed above the gas burner 4 to heat-regenerate the absorbing liquid using the flame of the gas burner 4 as a heat source. The exhaust path 17 through which the exhaust gas combusted by the gas burner 4 flows is connected to the heat exchange part 5A, and the heat exchange part is heated and regenerated by the heat exchange part 5A on the side of the heat exchange part 5A. The concentrated absorbent liquid 5C in which the concentrated absorbent liquid flowed out from the part 5A is formed. In the concentrated absorbent liquid pool 5C, a liquid level sensor 52 for detecting the liquid level of the desorbed absorbent liquid is provided in the concentrated absorbent liquid pool 5C (in the high temperature regenerator 5).

One end of the concentrated absorbent liquid tube 22 is connected to the lower end of the concentrated absorbent liquid 5C, and the other end of the concentrated absorbent liquid tube 22 extends from the low temperature regenerator 6 through the high temperature heat exchanger 13. Join the tube (24). The high temperature heat exchanger 13 heats the absorbent liquid flowing through the third rare absorbent liquid tube 21C by the high temperature of the high temperature absorbent liquid flowing out from the concentrated absorbent liquid reservoir 5C, and thereby burns the gas burner 4 in the high temperature regenerator 5. To reduce fuel consumption. Moreover, the high temperature heat exchanger 13 upstream and the absorber 2 of the concentrated absorption liquid pipe 22 are connected by the absorption liquid pipe 23 which the opening-closing valve V1 interposes.

The low temperature regenerator 6 heats and regenerates the absorbent liquid accumulated in the absorbent liquid holding part 6B formed below the base layer portion 6A by using the refrigerant vapor separated by the high temperature regenerator 5 as a heat source. The heat transfer pipe 31A formed in a part of the refrigerant pipe 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the condenser 7 is disposed. By passing the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transferred to the absorption liquid accumulated in the absorption liquid pool 6B through the heat transfer tube 31A, and the absorption liquid is concentrated.

One end of the intermediate absorbent liquid tube 24 is connected to the absorbent liquid holding part 6B of the low temperature regenerator 6, and the other end of the intermediate absorbent liquid tube 24 joins the concentrated absorbent liquid tube 22 to provide a concentrated absorbent liquid tube 25. ) The concentrated absorbent liquid pipe 25 is connected to the concentrated liquid diffuser 2C provided above the base portion 2B of the absorber 2 through the concentrated absorbent liquid pump P2 and the low temperature heat exchanger 12. The low temperature heat exchanger 12 is a second rare absorbent liquid due to the heat of the concentrated absorbent liquid flowing out from the concentrated absorbent liquid holding part 5C of the high temperature regenerator 5 and the intermediate absorbent liquid flowing out from the absorbent liquid holding part 6B of the low temperature regenerator 6. The rare absorbent liquid flowing through the pipe 21B is heated. In addition, bypass pipes 25A and 25B for bypassing the concentrated absorbent liquid pump P2 and the low temperature heat exchanger 12 are provided on the upstream side of the concentrated absorbent liquid pump P2, and the operation of the concentrated absorbent liquid pump P2 is performed. When this is stopped, the concentrated absorbent liquid flowing out from the concentrated absorbent liquid holding part 5C of the high temperature regenerator 5 and the intermediate absorbent liquid flowing out from the absorbent liquid holding part 6B of the low temperature regenerator 6 are bypass pipes 25A and 25B. ) Is supplied into the absorber 2 without passing through the low temperature heat exchanger 12.

As described above, the refrigerant liquid holding part 7A formed at the base layer 5B of the high temperature regenerator 5 and the bottom of the condenser 7 is a heat transfer pipe piped to the absorbing liquid holding part 6B of the low temperature regenerator 6. 31A) and a refrigerant pipe 31 via the refrigerant drain heat recovery unit 16 are connected. The coolant pipe 31 is provided with a damper (flow resistance means) 41 for imparting a flow path resistance downstream of the coolant drain heat absorber 16, and flows through the coolant pipe 31 by the damper 41. The flow rate of the coolant decreases, so that heat exchange is sufficiently performed between the coolant vapor in the coolant tube 31 and the absorbent liquid in the low temperature regenerator 6, and the coolant vapor in the coolant tube 31 and the first rare absorption liquid pipe 21A. Heat exchange is sufficiently performed between the rare water in the column).

The upstream side of the heat transfer pipe 31A of the coolant pipe 31 and the base layer portion 2B of the absorber 2 are connected by a coolant pipe 32 interposed between the opening and closing valves V2. Moreover, 7 A of refrigerant | liquid liquid holding | maintenance parts of the condenser 7, and 1 A of base layer parts of the evaporator 1 are connected by the refrigerant pipe 33 through which 33 A of U seal parts are interposed. In addition, a coolant liquid holding part 1B is formed below the evaporator 1, where the liquefied refrigerant accumulates, and the spreader disposed above the coolant liquid holding part 1B and the base layer part 1A of the evaporator 1. 1C is connected by the refrigerant pipe 34 through which the refrigerant pump P3 is interposed. The coolant pump P3 downstream of the coolant pipe 34 and the absorbent liquid holding part 2A of the absorber 2 are connected by the coolant pipe 35 through the on-off valve V3. In addition, the outlet side of the array pipe 14A of the cold / hot water pipe 14 with the outlet side of the heat transfer pipe 15B of the cooling water pipe 15 is connected by a communication pipe 36 through which the opening / closing valve V4 is interposed.

The absorption chiller 100 performs a cooling operation for taking out cold water from the cold / hot water pipe 14 under the control of the controller 50. During the cooling operation, the temperature (temperature measured by the temperature sensor 61) of the evaporator 1 outlet side of the brine (for example, cold water) circulated and supplied to a heat load (not shown) through the cold / hot water pipe 14 is predetermined. The amount of heat input to the absorption chiller 100 to be a set temperature, for example, 7 ° C, is controlled by the controller 50. Specifically, the control device 50 starts all the pumps P1 to P3, and also burns the gas in the gas burner 4, and the temperature of the brine measured by the temperature sensor 61 reaches a predetermined temperature of 7 ° C. The fire power of the gas burner 4 is controlled to be. In the cooling operation, the on-off valves V1 to V4 are closed.

The rare absorbent liquid returned from the absorber 2 to the high temperature regenerator 5 by the rare absorbent liquid pump P1 through the rare absorbent liquid tube 21 is flamed by the gas burner 4 in the high temperature regenerator 5, Since it is heated by the combustion gas, the refrigerant in the rare water is evaporated off. The concentrated absorbent liquid whose concentration is increased by evaporating and separating the refrigerant from the high temperature regenerator 5 is concentrated through the high temperature heat exchanger 13 by the concentrated absorbent pump P2 of the concentrated absorbent liquid pipe 25 through the concentrated absorbent liquid pipe 22. It flows into the absorption liquid pipe 25.

The rare water absorbed from the absorber 2 through the rare water absorbing pipe 21 to the low temperature regenerator 6 by the rare water absorbing pump P1 is supplied from the high temperature regenerator 5 through the coolant pipe 31 to transfer the heat transfer pipe ( Heated by the high temperature refrigerant vapor flowing into 31A), the refrigerant in the rare water is evaporated off. The intermediate absorbent liquid whose concentration is increased by evaporating and separating the refrigerant in the low temperature regenerator 6 flows through the intermediate absorbent liquid tube 24 and merges in the concentrated absorbent liquid flowing through the concentrated absorbent liquid tube 22 and the concentrated absorbent liquid tube 25. The concentrated absorbent liquid is sent to the absorber 2 via the low temperature heat exchanger 12, and is scattered from the upper part of the concentrate spreader 2C.

On the other hand, the refrigerant separated and generated in the low temperature regenerator 6 enters the condenser 7 and condenses and accumulates in the refrigerant liquid holding part 7A. When a large amount of refrigerant liquid accumulates in the refrigerant liquid holding portion 7A, the refrigerant liquid flows out of the refrigerant liquid holding portion 7A, enters the evaporator 1 via the refrigerant pipe 33, and the refrigerant pump P3. ) Is lifted through the refrigerant pipe 34 and spread from the spreader 1C onto the heat transfer pipe 14A of the cold / hot water pipe 14.

Since the refrigerant liquid scattered over the heat pipe 14A takes vaporization heat from the brine passing through the inside of the heat pipe 14A and evaporates, the brine passing through the inside of the heat pipe 14A is cooled, so that the brine that lowers the temperature is a cold / hot water pipe. It is supplied to heat load from 14, and cooling operation, such as cooling, is performed.

The refrigerant evaporated in the evaporator 1 enters the absorber 2, is supplied from the high temperature regenerator 5 and the low temperature regenerator 6, and is absorbed into the concentrated absorbent liquid scattered from the upper side. The circulation conveyed to the high temperature regenerator 5 by the rare water-absorbing liquid pump P1 is repeated at the pregnant woman 2A. In addition, the heat generated when the absorbent liquid absorbs the refrigerant is cooled by the heat transfer pipe 15A of the cooling water pipe 15 disposed in the absorber 2.

However, in the absorption chiller 100, as the temperature (cooling water inlet temperature) of the cooling water supplied to the absorption chiller 100 decreases, the performance (COP) is improved. Normally, the cooling water inlet temperature is set at about 32 ° C., and if the cooling water inlet temperature is lower than an arbitrary concentration (for example, 17 ° C.), the high temperature regenerator 5 and the high temperature regenerator 5 are accompanied by a drop in pressure of the high temperature regenerator 5. The differential pressure with the condenser 7 becomes small. Since the damper 41 is provided in the refrigerant pipe 31, when the differential pressure between the high temperature regenerator 5 and the condenser decreases, the fluidity of the refrigerant decreases. As a result, the coolant liquid accumulates near the low temperature regenerator 6 of the coolant tube 31, or the coolant liquid passes through the low temperature regenerator 6 in the coolant tube 31 (hereinafter, simply referred to as 'retention state'). ), And furthermore, there is a fear that hunting that causes fluctuations in the outlet temperature of the brine supplied to the heat load is repeated up and down.

So, in this embodiment, the bypass pipe 42 which bypasses the damper 41 provided in the refrigerant pipe 31, the opening-closing valve 43 provided in this bypass pipe 42, and the cooling water pipe 15 A control device (valve control means) installed at the inlet side of the absorber 2 and controlling the on / off valve 43 in accordance with the measurement result of the coolant temperature sensor 62 and the coolant temperature sensor 62 for measuring the coolant inlet temperature. (50) is configured. As described above, the retention of the refrigerant is attributable to the differential pressure between the high temperature regenerator 5 and the condenser 7. In this embodiment, the differential pressure between the high temperature regenerator 5 and the condenser 7 corresponds to the cooling water inlet temperature. .

The on-off valve 43 is an operation valve configured to be openable and fully closed, and is operated by the control of the control device 50. The coolant temperature sensor 62 outputs the measurement result to the control device 50 under the control of the control device 50.

As shown in FIG. 2, when the temperature measured by the coolant temperature sensor 62 becomes equal to or less than the first temperature T1, the control device 50 opens the on / off valve 43. Here, the first temperature T1 is a cooling water inlet temperature immediately before the differential pressure between the high temperature regenerator 5 and the condenser 7 shown in FIG. 1 becomes small and the operation of the absorption chiller 100 starts to become unstable. It acquires by experiment etc. and is set to 15 degreeC in this embodiment. Thereby, even if the cooling water inlet temperature is equal to or lower than the first temperature T1 (15 ° C.) and the differential pressure between the high temperature regenerator 5 and the condenser 7 becomes small, the bypass pipe that the refrigerant liquid bypasses the damper 41. Since 42 is distributed, retention of the refrigerant can be prevented, and as a result, the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved.

On the other hand, as shown in FIG. 2, when the temperature measured by the cooling water temperature sensor 62 becomes equal to or higher than the second temperature T2, the control device 50 turns off the closing valve 43. Here, the second temperature T2 is a cooling water inlet temperature when the differential pressure between the high temperature regenerator 5 and the condenser 7 shown in FIG. 1 increases, and the operation of the absorption chiller 100 is stabilized. In this embodiment, the temperature is set to 20 ° C, which is 5 ° C higher than the first temperature T1. As a result, when the cooling water inlet temperature becomes equal to or higher than the second temperature T2 (20 ° C) and the pressure difference between the high temperature regenerator 5 and the condenser 7 becomes large, the refrigerant liquid does not flow through the bypass pipe 42. The flow rate of the refrigerant flowing through the refrigerant pipe 31 is reduced by the damper 41, and the absorption liquid in the low temperature regenerator 6 and the first rare water absorption liquid tube 21A are caused by the heat of the refrigerant vapor from the high temperature regenerator 5. The rare absorbent liquid can be heated sufficiently.

Thus, in this embodiment, the bypass pipe 42 which bypasses the damper 41 is provided in the absorption chiller 100 which has the damper 41, and the opening-closing valve 43 is provided in this bypass pipe 42. FIG. It is possible to correspond to the absorption chiller 100 of the low-temperature cooling water in a simple structure that is installed. In addition, since a relatively expensive pressure detecting means for detecting the pressure in the high temperature regenerator 5 or the condenser 7 is not required, an increase in cost by controlling the on-off valve 43 can be suppressed. In addition, since the cooling water temperature sensor 62 is provided at the intake side of the absorber 2 of the cooling water pipe 15, for example, the outlet of the absorber 2 of the cooling water pipe 15 and the outlet of the condenser 7 are provided. Compared with the case where it is installed on the side, a stable temperature can be measured without being influenced by inverter control of a cooling water pump (not shown), heat exchange in the absorber 2 or the condenser 7, and as a result, the opening / closing valve 43 Can be controlled more accurately.

As described above, according to the present embodiment, the coolant pipe 15 through which the coolant is sequentially distributed to the absorber 2 and the condenser 7 is provided, and the concentration of the coolant is set at the absorber inlet side of the coolant pipe 15. The cooling water temperature sensor 62 to be measured is provided, and the control apparatus 50 which controls the opening-and-closing valve 43 according to the measurement result of the cooling water temperature sensor 62 was comprised. According to this configuration, for example, when the coolant inlet temperature is low, the on / off valve 43 is controlled to increase the amount of refrigerant flowing through the bypass pipe 42, so that the refrigerant in the refrigerant pipe 31 can be easily flowed. Therefore, the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved.

Moreover, according to this embodiment, when the temperature measured by the cooling water temperature sensor 62 is below 1st temperature T1, it was set as the structure which opens and closes the valve 43. This configuration makes it possible to easily flow the refrigerant in the refrigerant pipe 31 when the cooling water inlet temperature is lower than or equal to the first temperature T1, so that the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved.

Moreover, according to this embodiment, the control apparatus 50 turns on / off the valve 43 when the temperature measured by the coolant temperature sensor 62 reached the 2nd temperature T2 higher than the 1st temperature T1. It was made to be totally closed. With this configuration, when the coolant inlet temperature is equal to or higher than the second temperature T2, since the refrigerant liquid does not flow through the bypass pipe 42, the refrigerant flowing through the coolant pipe 31 by the damper 41 The flow rate decreases, and the absorption liquid in the low temperature regenerator 6 and the rare absorption liquid in the first rare absorption liquid tube 21A can be sufficiently heated by the heat of the refrigerant vapor from the high temperature regenerator 5.

Second Embodiment

In the first embodiment, the control device 50 controls the on / off valve 43 according to the measurement result of the coolant temperature sensor 62. In the second embodiment, the on / off valve 43 is controlled by the coolant temperature sensor 62. The control is performed according to the measurement result and the opening degree of the fuel control valve 4B.

The retention of the refrigerant is caused by the amount of refrigerant vapor generated in the high temperature regenerator 5 in addition to the differential pressure between the high temperature regenerator 5 and the condenser 7, and the opening degree of the fuel control valve 4B is the high temperature regenerator 5. There is a roughly proportional relationship with the ratio of the amount of refrigerant vapor generated in the open city to the maximum amount of refrigerant vapor generated in Therefore, in the present embodiment, the differential pressure between the high temperature regenerator 5 and the condenser 7 is made to correspond to the cooling water inlet temperature, and the amount of refrigerant vapor generated is made to correspond to the opening degree of the fuel control valve 4B.

When the opening degree of fuel control valve 4B is more than predetermined opening degree, as for the control apparatus 50, as shown in FIG. 2, the temperature measured by the cooling water temperature sensor 62 is below 1st temperature T1 (15 degreeC). In this case, the on-off valve 43 of the bypass pipe 42 is developed. The predetermined opening degree is the opening degree just before the operation of the absorption type refrigerator 100 becomes unstable when the amount of refrigerant vapor generated in the high temperature regenerator 5 is relatively high and the differential pressure between the high temperature regenerator 5 and the condenser 7 is small. In this embodiment, the amount of refrigerant vapor is set to 50% when the amount of refrigerant vapor generated is maximum. As a result, the coolant inlet temperature is the first temperature T1 (15) when the opening degree of the fuel control valve 4B is equal to or larger than a predetermined opening degree (50%) and the amount of refrigerant vapor generated in the high temperature regenerator 5 is relatively high. Or less, and even if the differential pressure between the high temperature regenerator 5 and the condenser 7 becomes small, the refrigerant liquid flows through the bypass pipe 42 that bypasses the damper 41, thereby preventing the refrigerant from remaining. As a result, the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved.

On the other hand, when the opening degree of the fuel control valve 4B is more than predetermined opening degree (50%), the control apparatus 50 shows the temperature measured by the cooling water temperature sensor 62 as 2nd temperature T2, as shown in FIG. (20 degreeC) or more, the opening-closing valve 43 will be fully closed. As a result, the coolant inlet temperature of the fuel control valve 4B is higher than the predetermined opening degree (50%), and the amount of refrigerant vapor generated in the high temperature regenerator 5 is relatively high. Or higher), and the differential pressure between the high temperature regenerator 5 and the condenser 7 increases, the refrigerant liquid does not flow through the bypass pipe 42, so that the refrigerant flowing through the refrigerant pipe 31 by the damper 41 The flow rate decreases, and the absorption liquid in the low temperature regenerator 6 and the rare absorption liquid in the first rare absorption liquid pipe 21A can be sufficiently heated by the heat of the refrigerant vapor from the high temperature regenerator 5.

Moreover, even if the temperature measured by the coolant temperature sensor 62 is below the 1st temperature T1 (15 degreeC), when the opening degree of the fuel control valve 4B becomes less than predetermined opening degree (50%), The on-off valve 43 is made fully closed. That is, in this embodiment, both the conditions which the temperature measured by the coolant temperature sensor 62 is below the 1st temperature T1 (15 degreeC), and the conditions where the opening degree of the fuel control valve 4B are more than predetermined opening degree (50%) are Opening and closing valve 43 is opened only when satisfied. Thus, even if the cooling water inlet temperature is equal to or lower than the first temperature T1 (15 ° C.) and the differential pressure between the high temperature regenerator 5 and the condenser 7 is small, the opening degree of the fuel control valve 4B is a predetermined opening degree (50%). When the amount of the refrigerant vapor generated in the high temperature regenerator 5 is less than that, the refrigerant liquid does not flow through the bypass pipe 42. Therefore, the flow rate of the refrigerant flowing through the refrigerant pipe 31 by the damper 41 is increased. By lowering the temperature of the refrigerant vapor from the high temperature regenerator 5, the absorption liquid in the low temperature regenerator 6 can be sufficiently heated.

As described above, in this embodiment, in addition to the differential pressure between the high temperature regenerator 5 and the condenser 7, the open / close valve 43 is controlled in accordance with the amount of refrigerant vapor generated in the high temperature regenerator 5. Even if the pressure difference between the regenerator 5 and the condenser 7 is small, the amount of refrigerant vapor generated in the high temperature regenerator 5 is small, and in the case where it is difficult to generate the refrigerant, the opening and closing valve 43 can be prevented from opening. The fall of the performance of the absorption chiller 100 can be suppressed.

As described above, according to the present embodiment, the fuel control valve 4B for controlling the heat input amount of the high temperature regenerator 5 is provided, and the control device 50 includes the measurement result of the coolant temperature sensor 62 and the fuel. The on-off valve 43 was controlled in accordance with the opening degree of the control valve 4B. With this configuration, for example, when the cooling water inlet temperature is low and when the opening degree of the fuel control valve 4B is large, the on / off valve 43 is increased so as to increase the amount of refrigerant flowing through the bypass pipe 42. By controlling, the refrigerant in the refrigerant pipe 31 can be easily flowed, so that the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved. In addition, since the generation amount of the refrigerant vapor generated in the high temperature regenerator 5 is small and the refrigerant is hardly generated, the opening / closing valve 43 can be prevented from opening, thereby improving the COP of the absorption chiller 100. Can be.

[Third Embodiment]

3 is a schematic configuration diagram showing an absorption chiller according to a third embodiment. The absorption chiller 200 of the present embodiment includes a pressure sensor 53 for detecting pressure in the high temperature regenerator 5 and a refrigerant for measuring the temperature of the refrigerant at the outlet of the refrigerant drain heat recovery 16 of the refrigerant pipe 31. The structure is different from the above-mentioned absorption refrigerator 100 in that the temperature sensor 63 is provided. Since the other structure is the same as the absorption type refrigerator 100, the same code | symbol is attached | subjected and description is abbreviate | omitted.

In the first embodiment, the control device 50 controls the on / off valve 43 in accordance with the measurement result of the coolant temperature sensor 62. In the present embodiment, the measurement result of the coolant temperature sensor 62 and the pressure sensor The on-off valve 43 is controlled in accordance with the detection result of 53 and the measurement result of the refrigerant temperature sensor 63.

As described above, the retention of the refrigerant is attributable to the differential pressure between the high temperature regenerator 5 and the condenser 7. In this embodiment, the differential pressure between the high temperature regenerator 5 and the condenser 7 is determined by the cooling water inlet temperature and the high temperature regenerator. It corresponds to the pressure of (5). In addition, when the coolant stays, that is, when the flow velocity of the coolant flowing through the coolant pipe 31 becomes slow, the amount of heat exchange in the low temperature regenerator 6 and the coolant drain heat recoverer 16 increases, resulting in a coolant drain heat recoverer ( 16) Since the refrigerant temperature (refrigerant outlet temperature) on the outlet side becomes low, the retention of the refrigerant can be detected also by this refrigerant outlet temperature. Therefore, in the present embodiment, the flow velocity of the refrigerant is made to correspond to the temperature of the refrigerant at the outlet side of the refrigerant drain heat recovery unit 16 of the refrigerant pipe 31.

The pressure sensor 53 detects the pressure in the high temperature regenerator 5 under the control of the control device 50, and outputs the detection result to the control device 50. In addition, the coolant temperature sensor 63 outputs the measurement result to the control device 50 under the control of the control device 50.

When the pressure detected by the pressure sensor 53 is less than the predetermined pressure and the temperature measured by the coolant temperature sensor 63 is equal to or less than the predetermined temperature, the controller 50 shows the coolant temperature sensor 62. When the temperature measured by) becomes less than or equal to the first temperature T1 (15 ° C), the opening / closing valve 43 of the bypass pipe 42 is developed. The predetermined pressure is low in the high temperature regenerator 5, the differential pressure between the high temperature regenerator 5 and the condenser 7 becomes small, and the high temperature regenerator 5 immediately before the operation of the absorption chiller 100 becomes unstable. As internal pressure, it acquires beforehand by experiment etc. In this embodiment, it is set to 20 kPa on an absolute pressure basis. In general, the pressure in the high temperature regenerator 5 is about 80 kPa on an absolute pressure basis. The predetermined temperature is a coolant which indicates that the flow rate of the coolant flowing through the coolant pipe 31 is low, and thus the low temperature regenerator 6 and the coolant drain heat recovery unit 16 perform heat exchange more than usual and thus the coolant temperature is low. As outlet temperature, it acquires previously by experiment etc., and is set to 30 degreeC in this embodiment. In addition, the refrigerant outlet temperature is usually about 40 ° C.

As a result, the inlet of the coolant in the state where the pressure in the high temperature regenerator 5 is lower than the predetermined pressure (20 kPa) and the temperature at the outlet side of the coolant drain heat recovery unit 16 of the coolant pipe 31 is lower than or equal to the predetermined temperature (30 ° C). Even if the temperature becomes below the first temperature T1 (15 ° C.) and the differential pressure between the high temperature regenerator 5 and the condenser 7 becomes small, the refrigerant liquid flows through the bypass pipe 42 that bypasses the damper 41. Therefore, it is possible to prevent the refrigerant liquid from accumulating in the low temperature regenerator 6 in the refrigerant pipe 31, and as a result, the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved.

On the other hand, the control device 50 controls the fuel when the pressure detected by the pressure sensor 53 is less than the predetermined pressure (20 kPa) and the temperature measured by the refrigerant temperature sensor 63 is equal to or less than the predetermined temperature (30 ° C). When the opening degree of the valve 4B is more than a predetermined opening degree (50%), as shown in FIG. 2, when the temperature measured by the cooling water temperature sensor 62 becomes more than 2nd temperature T2 (20 degreeC), it opens and closes The valve 43 is made fully closed. As a result, when the pressure in the high temperature regenerator 5 is lower than the predetermined pressure (20 kPa) and the refrigerant outlet temperature is lower than or equal to the predetermined temperature (30 ° C), the cooling water inlet temperature is higher than or equal to the second temperature (T2) (20 ° C). When the differential pressure between the high temperature regenerator 5 and the condenser 7 becomes large, the refrigerant liquid does not flow through the bypass pipe 42, so that the flow rate of the refrigerant flowing through the refrigerant pipe 31 is reduced by the damper 41. The absorption liquid in the low temperature regenerator 6 and the rare absorption liquid in the first rare absorption liquid tube 21A can be sufficiently heated by the heat of the refrigerant vapor from the high temperature regenerator 5.

Moreover, even if the temperature measured by the coolant temperature sensor 62 is below the 1st temperature T1 (15 degreeC), the control apparatus 50 will make the pressure which the pressure sensor 53 detected more than predetermined pressure (20 Pa), or Alternatively, when the temperature measured by the refrigerant temperature sensor 63 becomes higher than the predetermined temperature (30 ° C.), the on-off valve 43 is made totally closed. That is, in this embodiment, the temperature measured by the coolant temperature sensor 62 is below the 1st temperature T1 (15 degreeC), the condition which the pressure detected by the pressure sensor 53 is less than predetermined pressure (20 Pa), and a coolant. The on-off valve 43 is opened only when the temperature measured by the temperature sensor 63 satisfies all of the conditions below the predetermined temperature (30 ° C.). Thus, even if the cooling water inlet temperature is equal to or lower than the first temperature T1 (15 ° C.) and the differential pressure between the high temperature regenerator 5 and the condenser 7 is small, the pressure in the high temperature regenerator 5 is equal to or higher than the predetermined pressure (20 kPa). When the coolant outlet temperature is higher than the predetermined temperature (30 ° C.), the coolant liquid does not flow through the bypass pipe 42. Therefore, the flow rate of the coolant flowing through the coolant pipe 31 by the damper 41 is increased. By lowering the temperature of the refrigerant vapor from the high temperature regenerator 5, the absorption liquid in the low temperature regenerator 6 and the rare water absorption liquid in the first rare water absorption tube 21A can be sufficiently heated.

As described above, in the present embodiment, since the differential pressure between the high temperature regenerator 5 and the condenser 7 corresponds to both the cold and hot water inlet temperature and the pressure in the high temperature regenerator 5, the high temperature regenerator 5 and the condenser 7 The differential pressure can be detected reliably. In addition, since the on-off valve 43 is controlled in accordance with the differential pressure between the high temperature regenerator 5 and the condenser 7 and the refrigerant outlet temperature, even if the differential pressure between the high temperature regenerator 5 and the condenser 7 is small, the refrigerant pipe When the flow rate of the coolant circulating 31 is high and the retention of the coolant is difficult to occur, the opening and closing valve 43 can be prevented from being opened, thereby reducing the performance of the absorption chiller 100. In addition, since a relatively expensive pressure detecting means for detecting the pressure in the condenser 7 is not required, an increase in cost by controlling the on-off valve 43 can be suppressed.

As described above, according to the present embodiment, the refrigerant pipe 31 downstream of the low temperature regenerator 6 includes a refrigerant flowing through the refrigerant pipe 31 and a first rare absorbing liquid extending from the absorber 2. A coolant drain heat recovery unit 16 for exchanging heat is provided, and a high pressure regenerator 5 is provided with a pressure sensor 53 for detecting a pressure in the high temperature regenerator 5, and a coolant drain heat recovery of the coolant pipe 31 is provided. A coolant temperature sensor 63 for measuring the temperature of the coolant at the outlet side of the machine 16 is provided, and the control device 50 includes a measurement result of the coolant temperature sensor 62, a detection result of the pressure sensor 53, The on-off valve 43 was controlled in accordance with the measurement result of the coolant temperature sensor 63. By this configuration, for example, when the temperature of the cooling water is low, when the pressure in the high temperature regenerator 5 is low, and when the temperature of the refrigerant drain heat recovery 16 exit side of the refrigerant is high, By controlling the opening / closing valve 43 to increase the amount of refrigerant flowing through the pass pipe 42, the refrigerant in the refrigerant pipe 31 can easily flow, so that the absorption chiller 100 can be stably operated. Therefore, since low-temperature cooling water can be used, the COP of the absorption chiller 100 can be improved. In addition, when the flow rate of the coolant flowing through the coolant pipe 31 is high, and the retention of the coolant is hard to occur, the opening / closing valve 43 can be prevented from being opened, thereby improving the COP of the absorption refrigerator 100. have

However, the said embodiment is a kind of this invention, and can be changed suitably in the range which does not deviate from the meaning of this invention.

For example, in the said embodiment, although the structure provided with the gas burner 4 which burns fuel gas and heats as heating means for heating an absorption liquid in the high temperature regenerator 5 was demonstrated, it is not limited to this, It is good also as a structure provided with the burner which burns kerosene and A heavy oil, and the structure heated using heat, such as steam and exhaust gas.

In addition, in the said embodiment, although the flow path resistance means was demonstrated as the damper 41, the flow path resistance means is not limited to this, For example, a flow control valve or an orifice may be sufficient.

In the above embodiment, the absorption chiller 100 includes a so-called parallel flow cycle in which a rare water absorbing tube 21 extending from the absorber 2 branches into two parts of the high temperature regenerator 5 and the low temperature regenerator 6. Although not limited to this, for example, a so-called series flow cycle for supplying the absorbent liquid discharged from the high temperature regenerator to the low temperature regenerator, or the so-called reverse flow for supplying the absorbent liquid discharged from the low temperature regenerator to the high temperature regenerator You may apply this invention to the absorption chiller formed by the cycle.

Moreover, in the said embodiment, although an absorption chiller is a dual utility type, it cannot be overemphasized that this invention can be applied to the absorption chiller and water heater and absorption type heat pump apparatus of the single use dual use type and the triple use type and triple use type types.

1 evaporator 2 absorber
48 Fuel control valve (heat control valve) 5 High temperature regenerator
6 Low Temperature Regenerator 7 Condenser
15 Cooling water pipe 16 Refrigerant drain heat recovery machine
21A No. 1 Rare Absorption Tube (Respiratory Tube) 31 Refrigerant Tube
41 Damper (Euro Resistance) 42 Bypass Pipe
43 Valve 50 control device (valve control means)
53 Pressure sensor 62 Coolant temperature sensor
63 Refrigerant Temperature Sensor 100 Absorption Chiller

Claims (5)

A high temperature regenerator, a low temperature regenerator, an evaporator, a condenser and an absorber, and the high temperature regenerator and the condenser are connected in a refrigerant pipe via the low temperature regenerator, and a flow path resistance means for imparting a flow path resistance to the refrigerant pipe, In an absorption chiller in which a bypass pipe for bypassing is provided and an on-off valve is provided in the bypass pipe,
Cooling water pipes for circulating the cooling water in turn to the absorber and the condenser,
A coolant temperature sensor for measuring the temperature of the coolant is installed at the absorber inlet side of the coolant pipe,
And a valve control means for controlling the on-off valve in accordance with the measurement result of the coolant temperature sensor. The method according to claim 1,
And the valve control means expands the on / off valve when the temperature measured by the coolant temperature sensor is equal to or less than a first temperature. The method according to claim 2,
And the valve control means closes the open / close valve when the temperature measured by the coolant temperature sensor reaches a second temperature higher than the first temperature. The method according to claim 1,
It is provided with a heat input amount control valve for controlling the heat input amount of the high temperature regenerator,
And the valve control means controls the on-off valve according to the measurement result of the coolant temperature sensor and the opening degree of the heat input control valve. The method according to claim 1,
The refrigerant pipe downstream of the low temperature regenerator is provided with a refrigerant drain heat recovery unit for performing heat exchange between the refrigerant flowing through the refrigerant pipe and the rare water flowing through the rare absorbing liquid tube extending from the absorber.
The high temperature regenerator is provided with a pressure sensor for detecting the pressure in the high temperature regenerator,
A refrigerant temperature sensor for measuring the temperature of the refrigerant is installed at the outlet of the refrigerant drain heat recovery unit of the refrigerant pipe,
And the valve control means controls the on / off valve according to the measurement result of the coolant temperature sensor, the detection result of the pressure sensor, and the measurement result of the refrigerant temperature sensor.

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