JPS5832301B2 - absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an absorption refrigerator from which cold water or brine can be selectively extracted.

By making it possible to selectively take out cold water or brine at different temperatures from an absorption chiller, it is possible to take out cold water or brine from the absorption chiller at any time while the absorption chiller is making ice and cooling/heating. It is possible to obtain an absorption refrigerator that can extract cold water at a constant temperature even if the temperature of heated waste water decreases.

The present invention aims to provide an absorption refrigerator that can selectively take out cold water or brine having different temperature levels.

To achieve that purpose, an absorption refrigerator consists of a generator and a condenser, a first absorber and a first evaporator, a second absorber and a second evaporator, The evaporator and the second evaporator are each provided with an outlet for liquid such as cold water and/or brine, and the unvaporized refrigerant in the first evaporator on the high temperature side is transferred to the second evaporator on the low temperature side. A driving heat source such as hot water evaporates the refrigerant from the generator, the refrigerant is condensed in a condenser, and the refrigerant is evaporated in the first and second evaporators. The heat of vaporization during this process is used to cool liquids such as water and/or brine.

Embodiments of an absorption refrigerator according to the present invention will be described with reference to the drawings.

In this embodiment, as shown in FIG. A so-called first type heat pump that obtains hot water 7 from a pipe flowing through an absorber 2 and a condenser 3, a driving heat source that heats the dilute absorption liquid of a generator 11, and an evaporator 14 as shown in FIG. The refrigerant pump 1 uses heated waste water 15 as a heating source and sends refrigerant from the condenser 13 to the evaporator 14.
7, the temperature of the absorber 12 can be adjusted to the temperature of the generator 1.
1, and the temperature of the evaporator 14 is higher than that of the condenser 13.
A so-called second type heat pump is used, which is capable of operating at a temperature higher than .

A lithium bromide aqueous solution (H2O-LiBr) or lithium bromide-methyl alcohol (CH30HLiBr) is used as the refrigerant/absorbing liquid for these heat pumps.

In the present invention, for convenience, the first type of heat pump will be referred to as an absorption refrigerator, and the second type of heat pump will be referred to as an absorption heat pump in the following description.

2 to 4 are explanatory diagrams showing a first embodiment of the refrigeration system according to the present invention, and 9 is an explanatory diagram showing a first embodiment of the refrigeration system according to the present invention, in which the absorption refrigerator shown in FIG. The upper one is a first absorber 2a for cold water, the first evaporator 4a1 and the lower one is a second absorber 2 for brine.
b and the second evaporator 4b, and 19 is the second evaporator 4b.
This is the absorption heat pump shown in the figure.

5 is high-temperature water for driving the absorption chiller 9, 15 is heated waste water in factories, etc., 8, 18 is cooling water such as river water, cooling tower water, or sea water, and 21, 22, and 24.25 are cold water and brine. The inlet and outlet are shown, and 23 and 26 are the cold water pump and brine pump.

Regarding the operation of the refrigeration system, approximately 60°C heated waste water 15 flowing from a heated waste water source is used as an absorption heat pump 19.
Cooling water 18 at approximately 25°C flowing from a cooling water source such as seawater is disposed of after flowing into the evaporator 14 and generator 11 of or be discarded.

Then, high-temperature water 5 at about 80° C. is taken out from the absorber 12.

In the absorption refrigerator 9, the high temperature water 5 obtained from the absorption heat pump 19 is circulated as a driving heat source for the generator 1, and the gaseous refrigerant generated here is converted into a liquid refrigerant in the condenser 3, and the first In order to efficiently absorb the refrigerant vaporized in the evaporator 4a, the cooling water 8 at about 25° C. flowing from the cooling water source is returned through the first absorber 2a and the condenser 3.

As a result, the first evaporator 4a is cooled, and cold water at about 6° C. is taken out from the first evaporator 4a.

Further, in order to efficiently absorb the refrigerant vaporized by the second evaporator 4b, the unvaporized refrigerant in the first evaporator 4a is used for cooling the second absorber 2b and then refluxed.

This cools the second evaporator 4b, and cold brine at about -13°C is removed from the second evaporator.

The one shown in Fig. 3 is a cold water/brine extraction switching type of a cold water ice making cycle using an absorption refrigerator, and the purpose is to extract either cold water or brine. By turning off the brine pump 26, cold water can be taken out automatically while other equipment remains on.Also, when taking out brine, turn off the cold water pump 23 and turn off other equipment.
By setting the temperature to N, the low temperature brine can be automatically taken out.

Alternatively, if the generator inlet temperature is high, the cold water outlet 2
It is also possible to create a cycle in which cold water for air conditioning is obtained from 2, and low-temperature brine is obtained from the brine outlet 25 to produce ice for cold storage.

In addition, the valve opening degrees of the pumps 23 and 26 of the cold water inlet 21 and brine inlet 24 described above are adjusted, and when the generator inlet temperature decreases, the cold water extraction for the load can be switched to the brine side. This allows the temperature of the cold water taken out to be kept substantially constant.

In the cold water ice-making cycle described above, depending on the temperature of each evaporator, both the cold water and the brine can be either cold water or both brine.

Also, as shown in FIG. 5, compared to the one in FIG. 3, except for the cold water inlet, outlet and cold water pump 21.22.23, the brine inlet, outlet and brine pump 24.
It is also possible to use only 25.26 and a brine extraction type for exclusive use of the ice making cycle using an absorption refrigerator.

[Brief explanation of drawings]

FIG. 1 is a diagrammatic explanatory diagram of a first type heat pump, FIG. 2 is a diagrammatic explanatory diagram of a second type heat pump, and FIG. 3 is a diagrammatic explanatory diagram of a first embodiment of an absorption refrigerator according to the present invention. Figure 4 is an explanatory diagram of the refrigeration system including the absorption refrigerator shown in Figure 3, and Figure 5 is
The figure shows a diagrammatic illustration of a second embodiment of an absorption refrigerator according to the invention. 1... Generator, 2... Absorber, 2a.
...First absorber, 2b...Second absorber,
3... Condenser, 4... Evaporator, 4a.
...first evaporator, 4b...second evaporator,
5...High temperature water, 9...Absorption refrigerator, 1
1... Generator, 12... Absorber, 13
...Condenser, 14...Evaporator, 17.
... Refrigerant pump, 19 ... Absorption heat pump, 21 ... Cold water inlet, 22 ...
・Cold water outlet, 23...Cold water pump, 24...
...Brine inlet, 25...Brine outlet, 26...Brine pump.

Claims (1)

[Claims] 1 Consists of a generator, a condenser, two absorbers, and two evaporators, and sends the concentrated absorption liquid from which the refrigerant has been separated in the generator to the second absorber on the low temperature side via the first absorber on the high temperature side, An evaporator on the high temperature side that absorbs vaporized refrigerant in each absorber and circulates it back to the generator, and communicates the refrigerant separated in the generator and liquefied in the condenser to the first absorber; Second
The refrigerant is vaporized in the evaporator on the low temperature side communicating with the absorber, while the unvaporized refrigerant in the evaporator on the high temperature side is used to cool the second absorber on the low temperature side, and each of the above evaporators has a cooling An absorption refrigerator characterized by having an outlet for taking out the liquid.