JPH0762568B2 - Double-effect absorption chiller / heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a double-effect absorption chiller-heater having a refrigerant storage chamber in a condenser.

[Conventional technology]

The conventional structure will be described with reference to FIG. High temperature regenerator 1 having a heating source for heating a dilute solution, and this high temperature regenerator 1
The dilute solution heated in 1st refrigerant vapor 2 and intermediate concentration solution 3
And a low-temperature regenerator 7 for separating the intermediate-concentration solution 3 into a second refrigerant vapor 5 and a concentrated solution 6 by using the first refrigerant vapor 2 as a heat source to heat the intermediate-concentration solution 3 Then, the first liquid refrigerant 8 which is a condensate of the first refrigerant vapor used as a heating source of the intermediate concentration solution 3 flows through the low temperature regenerator 7, and the second refrigerant vapor 5
A condenser 9 for condensing the refrigerant, a refrigerant storage chamber 11 provided in the condenser 9 into which a part of the second liquid refrigerant 10 that is a condensed liquid of the second refrigerant vapor 5 flows, and a balance of the second liquid refrigerant 10. And the first
The liquid refrigerant 8 is mixed and introduced from the first line 12 formed of the overflow pipe, and the liquid refrigerant in the refrigerant storage chamber 11 is introduced from the second line 14 via the refrigerant proportional valve 13 from both lines 12 and 14. By the evaporator 15 in which the introduced liquid refrigerant absorbs heat from cold water to evaporate, and the concentrated solution 6 introduced from the low temperature regenerator 7, the refrigerant vapor flowing from the evaporator 15 is absorbed to form a dilute solution 16. It comprises an absorber 17 and a circulation means 18 consisting of a pump for pumping the dilute solution 16 to the high temperature regenerator 1. The refrigerant proportional valve 13 is provided for adjusting the concentration of the absorbing solution, and the amount of liquid refrigerant flowing from the refrigerant storage chamber 11 to the evaporator 15 is adjusted depending on the opening / closing amount. The opening / closing operation of the refrigerant proportional valve 13 is controlled based on a temperature detection signal from a temperature sensor (not shown) provided in the evaporator 15. That is, when the temperature of the cooling water is low, the temperature of the absorber 17 drops, and the temperature inside the evaporator 15 also drops accordingly. This low temperature state means that the refrigerant vapor generated in the evaporator 15 can be absorbed in a large amount in the absorber 17, the valve opening becomes large, and conversely the temperature in the evaporator 15 is high. In this case, the valve opening is automatically controlled so as to be small. Then, when the valve opening is large in the operating state, the temperature of the absorbing solution becomes rare, and conversely, when the valve opening is small, a large amount of liquid refrigerant is stored in the refrigerant storage chamber 11, so that the absorption The concentration of the solution becomes thicker, and the solution is adjusted to the optimum concentration according to the temperature change of the cooling water that radiates the heat in the refrigerator to the outside air.

[Problems to be Solved by the Invention]

In the conventional structure, the first refrigerant vapor 2 is used as a heating source of the intermediate concentration solution 3 in the low temperature regenerator 7, and the first liquid refrigerant 8 condensed by the first refrigerant vapor 2 is not introduced into the refrigerant storage chamber 11 but directly. It was introduced at the bottom of the condenser 9. The liquid refrigerant flowing into the refrigerant storage chamber 11 is a part of the second refrigerant vapor generated in the low temperature regenerator 7. That is, the amount of refrigerant flowing into the refrigerant storage chamber 11 is about 10% of the total amount of refrigerant, and the remaining about 90% of the refrigerant is the first liquid refrigerant 8 and the second liquid refrigerant 10.
Of these, those that do not flow into the refrigerant storage chamber 11 are combined and introduced to the bottom of the condenser 9.

With the above structure, the rated refrigerating capacity (10
There was a problem that a lot of time was required until the occurrence.
In order to generate the rated refrigerating capacity, it is necessary to increase the concentration of the absorbing solution, and therefore the refrigerant storage chamber 11 must store a predetermined amount of liquid refrigerant. However, since the conventional structure is a structure in which only a part of the second liquid refrigerant 10 flows into the refrigerant storage chamber 11, the increase rate of the storage amount is slow,
It took a long time until the rated refrigerating capacity (100%) occurred.

Also, when the operation is switched from high (Low) to low (Low) and from low to stop (OFF), the amount of concentrated solution flowing into the absorber changes from High flow rate to Low flow rate and Low flow rate at the same time as switching. Although the flow rate instantly switches from the flow rate to the stop, the refrigerant liquid requires a phase change of evaporation and condensation, so that there is a time delay until it reaches the refrigerant flow rate suitable for the solution flow rate, and most of the time lag of the refrigerant is the first. Since the liquid refrigerant 8 flows through the flow path, there is a problem that it cannot be effectively recovered and is lost as an ineffective refrigerant.

An object of the present invention is to provide a double-effect absorption chiller-heater capable of shortening the time until the rated refrigerating capacity is generated at the start of the cooling operation and recovering the invalid refrigerant at the time of switching the operation mode.

[Means for Solving the Problems]

In order to achieve the above object, the double-effect absorption chiller-heater according to the present invention uses a high temperature regenerator that heats a dilute solution and a dilute solution heated by the high temperature regenerator as a first refrigerant vapor and an intermediate concentration solution. A separator for separating, a low temperature regenerator for heating the intermediate concentration solution by the first refrigerant vapor introduced from the separator to separate it into a second refrigerant vapor and a concentrated solution, and a first refrigerant passing through the low temperature regenerator. A first liquid refrigerant, which is a condensed liquid of vapor, flows in and a condenser that condenses the second refrigerant vapor, and a portion of a second liquid refrigerant, which is a condensed liquid of the second refrigerant vapor, is provided in the condenser. The refrigerant storage chamber and the liquid refrigerant inside the condenser are the first
An evaporator that is introduced from a line and the liquid refrigerant in the refrigerant storage chamber is introduced from a second line via a refrigerant proportional valve, and the liquid refrigerant introduced from both lines absorbs heat from cold water to evaporate, and the low temperature regeneration. A doubler equipped with an absorber that absorbs the refrigerant vapor flowing from the evaporator into a dilute solution by the concentrated solution introduced from the evaporator, and a circulation means that sends the dilute solution produced in the absorber to the high temperature regenerator. In the effect absorption chiller / heater, the first liquid refrigerant that has passed through the low temperature regenerator is introduced into the refrigerant storage chamber.

[Action]

Since the first liquid refrigerant that has passed through the low-temperature regenerator is directly introduced into the refrigerant storage chamber, the rate of increase in the amount of refrigerant in the refrigerant storage chamber at the start of the cooling operation is fast, and the concentration of the absorbing solution can be increased in a short time. The rated refrigerating capacity can be generated in a short time. Further, most of the time lag of the refrigerant at the time of switching the operation mode flows into the refrigerant storage chamber, so that it can be effectively recovered.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.
The same parts as those of the conventional structure are designated by the same reference numerals, and the description thereof will be omitted. The first refrigerant vapor 2 separated by the separator 4 is used as a heating source of the intermediate concentration solution 3 in the low temperature regenerator 7 and is condensed to become the first liquid refrigerant 8. This first liquid refrigerant 8 is the refrigerant. The outlet of the flow path of the first liquid refrigerant 8 is directly connected to the inside of the coolant storage chamber 11 so as to flow into the storage chamber 11.
Next, the operation will be described. At the start of the cooling operation, when the refrigerant storage amount in the refrigerant storage chamber 11 is small, it is necessary to immediately increase the amount to thicken the concentration of the absorbing solution. Since the first liquid refrigerant 8 condensed after passing through the low temperature regenerator flows into the refrigerant storage chamber 11, the total amount of generated refrigerant is about 7%.
Of the refrigerant can be made to flow into the refrigerant storage chamber 11, and the amount of refrigerant stored can be increased in a short time.
%) Is shortened compared to the conventional structure.
Further, as shown in FIG. 2, when the operation mode is switched, that is, when the cooling load is switched from High to Low, the amount of the absorbing solution and the refrigerant proportional valve opening are also switched, but the refrigerant generation is changed. The amount is delayed in response. According to the present invention, the time lag of the refrigerant is collected and stored in the refrigerant storage chamber 11. Similarly, when the operation mode is switched from Low to OFF, the time lag of the refrigerant is recovered. Therefore, it is possible to effectively utilize the time lag of the refrigerant that has been lost as an ineffective refrigerant in the related art, and it is possible to perform efficient operation.

〔The invention's effect〕

According to the present invention, since the liquid refrigerant, which is the condensed liquid of the refrigerant vapor condensed in the low temperature regenerator, is allowed to directly flow into the refrigerant storage chamber, the time until the rated refrigerating capacity is generated at the start of the cooling operation is shortened. be able to. Furthermore, the time lag of the refrigerant at the time of switching the operation mode can be recovered without making it an invalid refrigerant, and the absorption chiller-heater with high efficiency can be provided over the entire load region.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a double-effect absorption chiller / heater according to the present invention, FIG. 2 is a time chart explaining recovery of a time lag of a refrigerant at the time of switching operation modes, and FIG. 3 is a configuration diagram of a conventional example. Is. 2 ... First refrigerant vapor, 3 ... Medium concentration solution, 5 ... Second
Refrigerant vapor, 6 ... Concentrated solution, 7 ... Low temperature regenerator, 8 ... First liquid refrigerant, 9 ... Condenser, 10 ... Second liquid refrigerant, 11 ...
… Refrigerant storage room, 13 …… Refrigerant proportional valve.

Claims (1)

[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 first refrigerant vapor and an intermediate concentration solution, and a first refrigerant introduced from the separator. A low-temperature regenerator that heats the intermediate-concentration solution with steam to separate it into a second refrigerant vapor and a concentrated solution, and a first liquid refrigerant that is a condensate of the first refrigerant vapor that has passed through this low-temperature regenerator flow in A condenser for condensing the second refrigerant vapor, a refrigerant storage chamber provided in the condenser into which a part of the second liquid refrigerant that is a condensed liquid of the second refrigerant vapor flows, and a liquid refrigerant in the condenser are the first. An evaporator that is introduced from a line and the liquid refrigerant in the refrigerant storage chamber is introduced from a second line via a refrigerant proportional valve, and the liquid refrigerant introduced from both lines absorbs heat from cold water to evaporate, and the low temperature regeneration. The concentrated solution introduced from the vessel In the double-effect absorption chiller-heater equipped with an absorber that absorbs the refrigerant vapor flowing from the reactor to form a dilute solution, and a circulation means that sends the dilute solution produced in the absorber to the high-temperature regenerator, the low-temperature regeneration A double-effect absorption chiller-heater characterized in that the first liquid refrigerant that has passed through the container is introduced into the refrigerant storage chamber.