JPS6179962A - Absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an absorption refrigerator that can be operated by utilizing low-temperature waste heat, etc., which has not been available in the past.

[Prior art]

An example of a conventional device will be explained based on FIGS. 4 and 5.

1 is a regenerator, 2 is a condenser, 3 is an evaporator, 4 is an absorber, 5
is a heat exchanger, 6 is the heating fluid of the regenerator 1, 7 is the cooling water of the condensation mold 2 and the absorber 4, 8 is the cold water cooled by the evaporator 3, 9 is the diluted liquid that has absorbed the refrigerant, 10 is a concentrated solution obtained by separating the refrigerant from seafood.

Reference numeral 11 indicates high temperature refrigerant vapor separated in the regeneration M1, and reference numeral 12 indicates refrigerant vapor evaporated in the evaporator 3. After being exchanged and condensed and liquefied, it is depressurized and enters the evaporator 3. Here, the cold water is cooled and vaporized by heat exchange with the cold water 8, becomes refrigerant vapor 11, enters the absorber 4, and is absorbed by the concentrated solution 1o. The dilute solution 9, which has absorbed the refrigerant and has become diluted in concentration, exchanges heat with the concentrated solution 10 from the regenerator 1 in the heat exchanger 5, enters the regenerator 1, is heated again, and repeats the above cycle.

The above shows the cycle of the d-heavy-effect absorption freezing rock, and its pressure-temperature diagram is shown in Figure 5.

a is the state of a dilute solution of one volume of the regenerator 9. b is the state of the concentrated solution at the outlet of the regenerator 1, c is the state of the concentrated solution at the outlet of the absorber 4, d is the state of the dilute solution at the outlet of the absorber 4, 0. e is the state of the refrigerant in the condenser 2, r is the state of the refrigerant in the evaporator 3, XI and X2
The concentrations of a dilute solution 9 and a concentrated solution 10 are shown, respectively, and these are taken as an example of a lithium bromide-water system.

Generally, in air conditioning, the temperature at point f is TE = 5°C (outlet temperature of chilled water 8), and the temperature at points e and d is TC = 40°C (outlet temperature of cooling water 7). Concentration X1
is determined, and the temperature Thl of a is determined.

At this time, in order to establish an absorption refrigeration cycle, the temperature b (
It is necessary that the outlet temperature of the heat source flow KG) Th is higher than the temperature Thl of a, and in the case of lithium bromide-water system, Th is 575°C ~
It is 85°C.

[Problems to be solved by the invention] As mentioned above, the conventional lithium bromide-water absorption refrigerator requires a Th of 575°C to 85°C.
For example, it has been impossible to operate using low-temperature exhaust heat of 75°C to 85°C or less.

[Means for solving problems]

The present invention includes a heat pump that raises the temperature of a low-temperature heat source, and uses the heat source heated by the heat pump as a heating source for a regenerator.

[For production]

By raising the temperature of a heat source such as low-temperature waste heat to the temperature mentioned above using a heat pump and using this as the heating source for the regenerator,
It is possible to operate using 1 degree Celsius waste heat, which was previously unavailable.

〔Example〕

1 and 2 show one embodiment of the present invention, and 1 to 12 in FIG. 1 are the same as those of the prior art described above, and their explanation will be omitted.

In this embodiment, as shown in FIG. 1, a heat recovery device 13° compression@14. A heater 15 used as a heating source for the regenerator 1. Aperture I6
Configure the heat pump accordingly.

A heater 15 is disposed within the regenerator 1 so that the heat pump recovers heat from the low-temperature heat source 17, heats it up, and uses it as a heat source for the regenerator 1.

The heating medium 17 of the heat pump is heated and evaporated by a low-temperature heat source 18 in a heat recovery device 13, and then compressed and heated in a compressor 14 to become superheated steam. Condenses and liquefies.

As a result, the solution is heated and refrigerant vapor 11 is separated and generated, and this refrigerant vapor 11 is circulated as described above.

The heating medium 17 condensed and liquefied as described above reaches the heat recovery device 13 through the throttle 16, and the above cycle is repeated.

Figure 2 shows the P-I of the heating medium in the heat pump cycle.
In the diagram, the compressor 14 compresses the liquid to the state h, the heater 15 heats the +8 liquid to form the state I, and the throttle 16 reduces the pressure to the state J, then the heat recovery device 13, the heat is recovered from the low 1'Fjn heat source 18 and becomes 1 bear in the shape of g.

At this time, Tg)Th, and the heating temperature during reproduction ds1 becomes higher than the temperature of the heat source 18.

Therefore, it becomes possible to operate using a low-temperature heat source, which has been unavailable for a long time in conventional books.

Fig. 3 shows an example of application to a double-effect absorption refrigerator, where 1a is a high-pressure regenerator, 5a is a high-temperature heat exchanger, and 10a is a medium-temperature solution.
It is the same as the previous embodiment except that the heating source is used as a heating source.

〔effect〕

As is clear from the above, according to the present invention, it is possible to operate using a low-temperature heat source, which was impossible with conventional absorption chillers, and it is possible to effectively utilize energy.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a P I fjX diagram of a heat pump used therein. FIG. 3 is a block diagram showing another embodiment, FIG. 4 is a block diagram of a conventional one, and FIG. 5 is a pressure-temperature diagram thereof. 1: Regenerator, Ia two-high voltage regeneration word, 2: @Inaki. 3: Evaporator, 4: Absorber, 13: Heat sink collector, 14: Compressor, 15: Heater, 16: Calibrator, 17: Heating medium. 18: Low temperature heat source. Fang 1 Imperial Rice 20 Spear 32 Ice 4 Fang 50

Claims (1)

[Claims] An absorption refrigerator comprising a heat pump consisting of a heat recovery device, a compressor, a heater, and a throttle, the heat pump raising the temperature of a low-temperature heat source, and using this as a heat source for a regenerator.