JPH06241600A - Single/double absorption cold/hot water supply machine - Google Patents

Abstract

PURPOSE:To suppress an abrupt temperature drop of heat medium at the time of starting an operation by controlling a discharge amount of a solution pump for supplying dilute solution to a heat medium regenerator at the time of starting the operation. CONSTITUTION:Flow control means 30 for controlling a flow rate of a solution pump 5 for supplying dilute solution to a heat medium regenerator 7 is provided, and the pump 5 is controlled by an operation control program of an absorption hot water machine. A liquid level of a second liquid reservoir 7A of the regenerator 7 at the time of starting an operation is controlled by so controlling the pump 5 as to approach the ideal line lately as compared with a normal case. In this case, an inverter control for converting a frequency upon lapse of a time from the time of starting the operation conducts a frequency conversion upon lapse of the time from the time of starting the operation. A star-delta control for switching wirings of a motor for driving the pump 5 to star-delta connection conducts to approach the ideal line by switching at intervals of several tens seconds. Thus, the liquid level of the reservoir of the regenerator is smoothly raised, and heat exchanging is slowly conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller-heater having a heat-medium regenerator, and more particularly to a single-dip absorption chiller-heater which suppresses a sudden decrease in the temperature of the heat medium at the start of operation.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional single-double absorption water heater.
Will be described with reference to. The single double absorption cold water heater shown
High temperature regenerator 1 and separator 2 connected to high temperature regenerator 1
A high temperature solution heat exchanger 3 having a heating fluid inlet connected to the separator 2, a low temperature regenerator 6 connected to the heating fluid outlet of the high temperature solution heat exchanger 3 via an intermediate concentrated solution pipe 20, and a low temperature regeneration Condenser 8 connected to the condenser 6 via a refrigerant vapor passage 7D
An evaporator 9 connected to the bottom of the condenser 8 via a liquid refrigerant pipe 22 having a U-shaped liquid sealing portion, an absorber 10 arranged in the same container as the evaporator 9, and an absorber. Solution pump 5 having its suction side connected to the bottom of 10, low temperature solution heat exchanger 4 having the discharge side of solution pump 5 connected to the inlet side of the fluid to be heated, and the fluid to be heated of low temperature solution heat exchanger 4 The valve B12 on the outlet side and the valve A11 interposed in the pipe communicating the heated fluid inlet side of the high temperature solution heat exchanger 3, and the low temperature solution heat exchanger 4
Of the low temperature regenerator 6 and a branch pipe 25 which communicates with the low temperature regenerator 6.

A first liquid pool 6B partitioned by a partition wall 6A is formed in the low temperature regenerator 6, and a heating coil 6C is arranged in the first liquid pool 6B. Heating coil 6C
Has one end connected to the separator 2 and opening to the gas phase side, and the other end opening to the adjacent condenser 8.

A heat medium regenerator 7 is provided above the low temperature regenerator 6. A second liquid pool 7A is provided above the heating coil 6C of the low temperature regenerator 6, and the hot water coil 7 that allows the heat medium to pass therethrough.
B is arranged in the second liquid pool 7A, and an opening 7C is provided at the bottom of the second liquid pool 7A so that the liquid in the second liquid pool 7A can be dripped into the first liquid pool 6B. . The opening 7C transfers the liquid in the second liquid pool 7A to the first liquid pool 6B without using power. In this figure, the lower end of the opening 7C is the bottom position of the second liquid pool 7A, but the lower end position is not necessarily the bottom position of the second liquid pool 7A. It suffices if it is below the heat transfer surface of the hot water coil 7B arranged at. Hot water coil 7B
Both ends of are connected to a heat medium supply source (not shown). The end opening of the intermediate concentrated solution pipe 20 on the low temperature regenerator 6 side is arranged above the heating coil 6C, and the intermediate concentrated solution flowing out from the end opening flows into the first liquid pool 6B.

Further, a valve C13 is provided on a branch pipe 25 which connects the outlet side of the fluid to be heated of the low temperature solution heat exchanger 4 and the liquid pool of the low temperature regenerator 6, and a valve D1 is provided on the branch pipe 25 on the inlet side of the valve C13.
4 is provided so that the end of the branch pipe 26 is opened above the hot water coil 7B so that the dilute solution can be introduced into the second liquid pool 7A. The valve A11 is adjustable in opening.

A cooling water coil 8A and a cooling water coil 10A are arranged in the condenser 8 and the absorber 10, respectively. An evaporation coil 9A is arranged in the evaporator 9, and an evaporator of the liquid refrigerant pipe 22 is arranged. A liquid-refrigerant spraying means (not shown) is arranged at the end on the 9th side so that the liquid-coolant supplied from the liquid-refrigerant pipe 22 is sprayed onto the evaporation coil 9A. Also,
The evaporation coil 9A is connected to a cold load (not shown).

The bottom of the compartment adjacent to the first liquid pool 6B of the low temperature regenerator 6 with the partition wall 6A communicated with the heating fluid inlet of the low temperature solution heat exchanger 4 by the concentrated solution pipe 21, and the low temperature solution heat exchange. A concentrated solution pipe 24 is connected to the heated fluid outlet of the vessel 4. The other end of the concentrated solution pipe 24 is provided with an opening arranged above the cooling water coil 10A in the absorber 10, and the concentrated solution flowing out from the opening is sprayed to the cooling water coil 10A. Further, a liquid pipe that branches from the concentrated solution pipe 24 and supplies the concentrated solution via the valve F16 is provided at the bottom of the absorber 10.

One end of the branch pipe 25 is connected to a pipe connecting the heated fluid outlet of the low temperature solution heat exchanger 4 and the inlet of the valve B12, and the other end is connected to the bottom portion of the first liquid pool 6B via a valve C13. Has been done. The heated fluid outlet of the high temperature solution heat exchanger 3 communicates with the high temperature regenerator 1.

The operation of the refrigerant and the absorbing liquid in the single-effect operation mode (hereinafter referred to as the S mode) in the apparatus having the above structure will be described first. In the S mode, the valves B12 and C13 are closed and the valve D14 is opened, the heating source of the high temperature regenerator 1 is stopped, and hot water for heating is circulated in the hot water coil 7B. The diluted solution sucked and pumped by the solution pump 5 is fed to the low-temperature solution heat exchanger 4 on the heated fluid side, the branch pipe 2
5, 26, and the valve D14, and flows into the second liquid pool 7A in the heat medium regenerator 7 and is heated by the hot water in the hot water coil 7B. By the heating, a refrigerant vapor is generated from the dilute solution, and the refrigerant vapor flows into the condenser 8 through the refrigerant vapor passage 7D. The refrigerant vapor flowing into the condenser 8 is cooled and condensed by the cooling water flowing in the cooling water coil 8A arranged in the condenser 8 to become the liquid refrigerant, and passes through the liquid refrigerant pipe 22 to the evaporation coil 9
Sprayed on A. In addition, the cooled and condensed liquid refrigerant is
It may be stored in the liquid pool 8B and sprayed on the evaporation coil 9A of the evaporator 9 via the liquid refrigerant pipe 23 and the valve E15.
The liquid refrigerant sprayed on the evaporation coil 9A is
The heat of the fluid in A is taken away to evaporate, and again becomes refrigerant vapor and flows into the absorber 10. On the other hand, the dilute solution obtained by evaporating the refrigerant in the second liquid pool 7A becomes a concentrated solution and flows down into the first liquid pool 6B through the opening 7C, and then overflows beyond the partition wall 6A to form a concentrated solution pipe. 21 and the heating fluid side of the low temperature solution heat exchanger 4 and the concentrated solution pipe 24, and then flows into the absorber 10. The concentrated solution that has flowed into the absorber 10 is sprayed onto the cooling water coil 10A inside the absorber 10, and the concentrated solution that has been sprayed onto the cooling water coil 10A flows from the evaporator 9 into the absorber 10. It absorbs the refrigerant vapor and becomes a dilute solution. The absorption heat generated in the dilute solution formation process is removed by the cooling water flowing in the cooling water coil 10A. The produced dilute solution is the absorber 1
It collects at the bottom of 0 and is sucked and pumped by the solution pump 5, and the above cycle is repeated. The fluid deprived of heat in the evaporation coil 9A, usually water, is sent to the cold load as a low temperature source and used.

Next, the operation of the refrigerant and the absorbing liquid in the double-effect operation mode (hereinafter referred to as D mode) will be described. In this mode, the valves A11, B12, C13 are set to open and the valve D14 is set to close, and the flow of hot water into the hot water coil 7B is stopped.

The dilute solution generated in the absorber 10 and sucked and pumped by the solution pump 5 passes through the heated fluid side of the low temperature solution heat exchanger 4, and a part of the diluted solution is branched pipe 25 and valve C1.
Through 3 into the first liquid pool 6B in the low temperature regenerator 6,
The remaining portion is heated through the valves A11, B12 and the heated fluid side of the high temperature solution heat exchanger 3, and then flows into the high temperature regenerator 1. The diluted solution flowing into the high temperature regenerator 1 is heated in the high temperature regenerator 1 by combustion heat, heat transfer, etc., and separated into a refrigerant vapor and an intermediate concentrated solution by the separator 2. The separated intermediate concentrated solution passes through the heating fluid side of the high temperature solution heat exchanger 3, heats the dilute solution passing through the heated fluid side of the high temperature solution heat exchanger 3, and then passes through the intermediate concentrated solution pipe 20 to reach a low temperature. After flowing into the first liquid pool 6B of the regenerator 6, the first liquid pool 6B is passed through the valve C13.
It is mixed with the dilute solution flowing into the.

On the other hand, the refrigerant vapor separated by the separator 2 flows into the heating coil 6C arranged in the first liquid pool 6B of the low temperature regenerator 6. The refrigerant vapor flowing into the heating coil 6C heats the mixture of the dilute solution and the intermediate concentrated solution in the first liquid pool 6B when passing through the heating coil 6C to generate new refrigerant vapor. The new refrigerant vapor becomes a gas-liquid two-phase flow in which a part is condensed and liquefied, and then passes through the refrigerant vapor passage 7D to the condenser 8
Flow into. The refrigerant that becomes the gas-liquid two-phase flow and flows into the condenser 8 is cooled and condensed by the cooling water coil 8A together with the refrigerant vapor that flows into the condenser 8 through the heating coil 7B and becomes all liquid refrigerant.

The liquid refrigerant is supplied to the evaporator 9 by the liquid refrigerant pipe 22.
To the evaporation coil 9A
The heat of the fluid in A is taken to evaporate, and becomes a refrigerant vapor again and flows into the adjacent absorber 10. On the other hand, the first liquid pool 6
The mixture of the dilute solution and the intermediate concentrated solution in which the refrigerant is evaporated in B is concentrated and overflows from the first liquid pool 6B over the partition wall 6A to become a concentrated solution, which is a heating fluid for the low temperature solution heat exchanger 4. The dilute solution flowing on the heated fluid side of the low temperature solution heat exchanger 4 is heated while flowing through the side, and the absorber 10 is passed through the concentrated solution pipe 24.
Flow into. The concentrated solution flowing into the absorber 10 is absorbed by the absorber 1
The coolant vapor that has been sprayed on the cooling water coil 10A inside 0 and flows from the evaporator 9 into the absorber 10 becomes a dilute solution. The absorbed heat generated in the dilute solution generation stage is removed by the cooling water flowing in the cooling water coil 10A. The generated dilute solution is sucked and pumped by the solution pump 5, and the above cycle is repeated. The fluid deprived of heat in the evaporation coil 9A, usually water, is used as a low temperature source under cold load.

Next, single-duplex operation mode (hereinafter SD
The operation of the refrigerant and the absorbing liquid in the mode) will be described.
In this mode, valves B12 and D14 are open and valve C is
13 is closed and the valve A11 is set to a required opening degree, and hot water for heating the low temperature heat exchanger is circulated to the hot water coil 7B. The diluted solution sucked in and pumped by the solution pump 5 is heated through the heated fluid side of the low temperature solution heat exchanger 4, and then a part of the diluted solution is passed through the branch pipes 25 and 26 and the valve D14 to generate the heat medium regenerator 7. It flows into the second liquid pool 7A inside, and the rest flows through the valves A11 and B12 and the heated fluid side of the high temperature solution heat exchanger 3 and is further heated, and then flows into the high temperature regenerator 1.
The dilute solution that has flowed into the high temperature regenerator 1 is heated in the high temperature regenerator 1 and separated in the separator 2 into a refrigerant vapor and an intermediate concentrated solution.
The separated intermediate concentrated solution passes through the heating fluid side of the high temperature solution heat exchanger 3, heats the dilute solution passing through the heated fluid side of the high temperature solution heat exchanger 3, and then low temperature regeneration is performed through the intermediate concentrated solution pipe 20. It flows into the first liquid pool 6B of the container 6. On the other hand, the dilute solution that has flowed into the second liquid pool 7A is heated by the hot water flowing in the hot water coil 7B to generate new refrigerant vapor,
It becomes an intermediate concentrated solution, flows down to the first liquid pool 6B, and is mixed with the intermediate concentrated solution flowing into the first liquid pool 6B through the intermediate fluid pipe 20 and the heating fluid side of the high temperature solution heat exchanger 3. To be done. That is, the low temperature heat exchanger 4 is provided in the first liquid pool 6B.
A part of the dilute solution that has exited and the intermediate concentrated solution separated by the separator 2 flow in. On the other hand, the refrigerant vapor separated by the separator 2 flows into the condenser 8 via the heating coil 6C, but while passing through the heating coil 6C, the intermediate concentrated solution in the first liquid pool 6B is heated to generate a new refrigerant. Generates steam. The new refrigerant vapor flows into the condenser 8 via the refrigerant vapor passage 7D together with the refrigerant vapor generated in the second liquid pool 7A, and together with the refrigerant vapor flowing into the condenser 8 via the heating coil 6C, inside the cooling water coil 8A. Is cooled and condensed by the cooling water of FIG. The dispersed liquid refrigerant deprives the heat of the fluid in the evaporation coil 9A and evaporates, and becomes a refrigerant vapor and flows into the adjacent absorber 10.

On the other hand, the intermediate concentrated solution obtained by evaporating the refrigerant in the first liquid pool 6B becomes a concentrated solution and becomes the first liquid pool 6B.
Overflows over the partition wall 6A and flows into the heating fluid side of the heat medium solution heat exchanger 4. The concentrated solution obtained by heating the dilute solution flowing through the heated fluid side of the low temperature solution heat exchanger 4 while flowing through the heated fluid side of the low temperature solution heat exchanger 4 passes through the concentrated solution pipe 24 and the cooling water coil 10A in the absorber 10 Sprinkled on top.
The concentrated solution sprinkled on the cooling water coil 10A is the evaporator 9
It absorbs the refrigerant vapor flowing in from and becomes a dilute solution. The absorption heat generated in the dilute solution generation stage is the cooling water coil 10A.
It is removed by the cooling water flowing inside. The diluted solution thus produced is sucked and pumped by the solution pump 5, and the above cycle is repeated.

In this operation mode, the second liquid pool 7A
The absorption liquid concentrated in 1. and the absorption liquid concentrated in the first liquid pool 6B are separately taken out and mixed in a pipe, so that heat of absorption is generated during mixing because the concentrations of both are different,
The heat may cause evaporation in the tube. If evaporation occurs in the pipe, the flow of the liquid in the pipe is obstructed, and stable operation of the device cannot be maintained. Therefore, the absorption liquid concentrated in the second liquid pool 7A is transferred to the first liquid pool 6B, where the heat of mixing is released and sent into the pipe as a concentrated solution.

[0017]

The conventional absorption chiller-heater having the refrigerant regenerator 7 shown in FIG. 4 has the second liquid pool 7A for storing the dilute solution, and the low-temperature dilute solution is stored in the initial stage of the operation. In a short time, the predetermined liquid level of the second liquid pool 7A is reached, and the hot water coil 7B is sufficiently immersed in the dilute solution to increase the heat transfer area. The temperature difference between the inlet and outlet of 7B rapidly increases, and a temporary overload occurs. In a system that uses engine exhaust heat, the temperature at which the heat medium returns to the engine is determined, and if the temperature of the heat medium drops too much, the heat balance of the system will be lost.

Further, there is a method of controlling the flow rate of the heat medium pump in order to prevent an overload at the start-up, as disclosed in Japanese Patent Laid-Open No. 58-203358. A heat medium pump must be installed and controlled for each chiller / heater, which complicates the system configuration and piping.

An object of the present invention is to suppress a sharp temperature drop of the heat medium at the start of operation in a single-double-effect absorption chiller-heater equipped with a heat medium regenerator using solar heat or exhaust heat as a heat source. is there.

[0020]

The above object is to provide a high temperature regenerator for heating a dilute solution, a separator for separating the dilute solution heated by the high temperature regenerator into a refrigerant vapor and an intermediate concentrated solution, and the separator. The first liquid in which the intermediate concentrated solution separated in step (3) is heated by the refrigerant vapor from the high temperature regenerator to generate the refrigerant vapor to generate the concentrated solution and the heat transfer surface is immersed in the dilute solution that does not flow into the high temperature regenerator. The high temperature regenerator has a pool and a heat transfer surface which is disposed above the first liquid pool and which heats a liquid branched from a pipe of a dilute solution which does not flow into the high temperature regenerator by another heat source to generate a refrigerant vapor. Of a dilute solution that does not flow into the heat medium regenerator having a second liquid pool having an opening at its bottom and a refrigerant vapor generated in the heat medium regenerator and / or the separator. A condenser that condenses and liquefies the separated refrigerant vapor into a liquid refrigerant, and the liquid An evaporator that evaporates the medium to remove the heat of vaporization from the low-temperature medium to cool it, an absorber that absorbs the refrigerant vapor generated in the evaporator into the concentrated solution to form a dilute solution, and an absorber formed in the absorber. In a single-double absorption chiller-heater equipped with a solution pump that pressure-feeds a dilute solution to the high temperature regenerator and / or the heat medium regenerator, a solution pump for supplying the dilute solution to the heat medium regenerator at the start of operation. This is achieved by providing means for controlling the discharge amount. The above object is achieved by the means for controlling the discharge amount of the solution pump being an inverter control device for controlling the rotation of an electric motor for driving the solution pump. The above purpose is
The means for controlling the discharge rate of the solution pump is achieved by a switching control device that switches the connection of the electric motor that drives the solution pump to star-delta.

The above object can be achieved by that the means for controlling the discharge amount of the solution pump is a flow control valve provided in the discharge side pipe of the solution pump.

[0022]

According to the above construction, by controlling the flow rate of the dilute solution supplied to the heat medium regenerator, the liquid level of the second liquid pool of the heat medium regenerator is gradually raised, and the heat transfer of the hot water coil is performed. Since the area gradually increases and the heat exchange is also performed slowly, it is possible to suppress a rapid temperature drop of the heat medium at the start of the operation.

[0023]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a flow diagram showing the configuration of the embodiment of the present invention.

The parts denoted by the same reference numerals as those in FIG. 4 showing the prior art are the same as those in the prior art, and the description thereof will be omitted. The difference between the present embodiment and the prior art shown in FIG. 4 is that the heat medium regenerator 7 is provided with the flow rate control means 30 for controlling the flow rate of the solution pump 5, and the solution pump 5 is controlled. Is incorporated into the operation control program of the absorption chiller-heater.

FIG. 2 is a chart showing the liquid level rising pattern of the heat medium regenerator according to the embodiment of the present invention.

FIG. 2 shows the second part of the heat medium regenerator 7 at the start of operation.
The liquid level rising pattern of the liquid pool 7A is shown, and the dotted line is a conventional liquid level generation line, which normally rises to the rated liquid level in about 2 minutes.
However, in the control in the present embodiment, the solid line is the ideal line with a guideline of about 5 minutes. The solution pump 5 is controlled so that the liquid level control at the start of operation is close to the ideal line.

In the inverter control for controlling the number of revolutions of the electric motor for driving the solution pump 5, frequency conversion is performed with the passage of time from the operation start time as shown by the alternate long and short dash line.

In the star-delta control for switching the connection of the electric motor for driving the solution pump 5 to the star-delta, the control is performed at intervals of several tens of seconds as shown by the chain double-dashed line so as to be close to the ideal line.

The on-off control is also a possible method like the star-delta control.

The solution pump 5 is controlled only when the operation of the absorption chiller-heater is started (single double effect or single effect), and normal operation is performed when a certain time has elapsed after the start. In addition to the control of the solution pump 5, a solution flow rate adjusting valve may be used to adjust the flow rate of the dilute solution to the heat medium regenerator 7.

FIG. 3 is a flow diagram showing the configuration of another embodiment of the present invention.

As shown in FIG. 3, a flow rate adjusting valve G17 is provided in the discharge side pipe of the solution pump 5.

Since the temperature of the dilute solution is low at the beginning of the operation, the larger the heat exchange area between the hot water coil 7A and the dilute solution, the more severe the rate of decrease in the temperature of the heat medium outlet from the cold / hot water machine. With such a configuration, when the amount of the dilute solution flowing into the heat medium regenerator 7 is adjusted at the start of operation of the absorption chiller-heater, the solution gradually accumulates in the second liquid pool 7A of the heat medium regenerator 7, The heat exchange amount in the heat medium regenerator 7 can be suppressed,
It is possible to prevent an increase (overload) in the inlet / outlet temperature difference of the heat medium. Further, since the solution is circulated at that time, stable operation can be started for the absorption chiller-heater.

As described above, according to the present embodiment, the single-double-effect absorption chiller-heater, the system including the single-effect absorption chiller-heater and the system utilizing the engine exhaust heat, or the steam-fired absorption chiller-heater is included. Thus, a smooth system operation can be performed without causing a sudden temperature drop of the heat source medium at the start of operation of the chiller-heater.

Further, in addition to the single-double-effect absorption chiller-heater described in this embodiment, a single-effect absorption chiller-heater and a steam-fired absorption chiller-heater also have similar effects.

[0037]

According to the present invention, by controlling the flow rate of the dilute solution supplied to the heat medium regenerator, the liquid level of the second liquid pool of the heat medium regenerator is gradually raised and heat exchange is also performed. Since the operation is performed slowly, the effect of suppressing a rapid temperature drop of the heat medium at the start of operation can be obtained.

[Brief description of drawings]

FIG. 1 is a flow diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a chart showing a liquid level rising pattern of a heat medium regenerator according to an embodiment of the present invention.

FIG. 3 is a flow diagram showing the configuration of another embodiment of the present invention.

FIG. 4 is a flow diagram showing the configuration of a conventional single-double absorption cold / hot water machine.

[Explanation of symbols]

 1 High Temperature Regenerator 2 Separator 3 High Temperature Solution Heat Exchanger 4 Low Temperature Solution Heat Exchanger 5 Solution Pump 6 Low Temperature Regenerator 6A Partition Wall 6B First Liquid Pool 6C Heating Coil 7 Heat Medium Regenerator 7A Second Liquid Pool 7B Hot water coil 7C Opening 7D Refrigerant vapor passage 8 Condenser 8A Cooling water coil 9 Evaporator 9A Evaporating coil 10 Absorber 10A Cooling water coil A11 valve B12 valve C13 valve D14 valve E15 valve F16 valve G17 Flow control valve 20 Intermediate concentrated solution pipe 21 Concentrated solution pipe 22 Liquid refrigerant pipe 23 Liquid refrigerant pipe 24 Concentrated solution pipe 25 Branch pipe 26 Branch pipe 30 Flow control means

Claims (4)

[Claims] 1. A high temperature regenerator for heating a dilute solution, a separator for separating the dilute solution heated by the high temperature regenerator into a refrigerant vapor and an intermediate concentrated solution, and an intermediate concentrated solution separated by the separator. A first liquid pool in which a heat transfer surface that is heated by the refrigerant vapor from the high temperature regenerator to generate a refrigerant vapor to generate a concentrated solution is immersed in a dilute solution that does not flow into the high temperature regenerator, and the first liquid. A concentrated solution of a dilute solution that does not flow into the high temperature regenerator having a heat transfer surface that is disposed above the pool and that heats the liquid branched from the pipe of the dilute solution that does not flow into the high temperature regenerator by another heat source to generate refrigerant vapor. A heat medium regenerator having a second liquid pool having an opening at the bottom thereof, and a refrigerant vapor generated in the heat medium regenerator and / or a refrigerant vapor separated in the separator is condensed and liquefied. And a condenser that serves as a liquid refrigerant, and a liquid refrigerant that evaporates the An evaporator that takes away the heat of evaporation to cool it, an absorber that absorbs the refrigerant vapor generated in the evaporator in the concentrated solution to produce a dilute solution, and a high temperature regenerator that dilutes the diluted solution produced in the absorber. And / or a single double absorption chiller-heater equipped with a solution pump for pressure-feeding the heat medium regenerator, a means for controlling the discharge rate of the solution pump for supplying the dilute solution to the heat medium regenerator at the start of operation. A single / double absorption cold / hot water machine characterized by being provided. 2. The single double absorption cold temperature according to claim 1, wherein the means for controlling the discharge amount of the solution pump is an inverter control device for controlling the rotation of an electric motor for driving the solution pump. Water machine. 3. The means for controlling the discharge amount of the solution pump is configured to connect a wire of an electric motor for driving the solution pump.
The single double absorption cold / hot water machine according to claim 1, wherein the single / double absorption cold / hot water machine is a switching control device for switching to a delta. 4. The single-double absorption chiller-heater according to claim 1, wherein the means for controlling the discharge amount of the solution pump is a flow control valve provided in the discharge side pipe of the solution pump. .