JPS5834732B2 - Single and double effect absorption refrigerator - Google Patents

Description

Detailed Description of the Invention The present invention relates to a single-double effect absorption refrigerator, which uses a low-temperature heat source such as solar hot water as the main heat source and a high-temperature heat source such as steam as an auxiliary heat source. The purpose is to select the operating mode of the refrigerator, to aim for effective use of energy, and to perform efficient operation.

In other words, enough solar heat can be obtained for one absorption refrigerator,
Single-effect operation is performed when hot water at a high temperature (85°C to 90°C) is supplied, and when the hot water temperature drops and an auxiliary heat source is added, single- and dual-effect operation is performed, and operation is disabled when the hot water temperature is low. When possible, dual-effect operation is performed using an auxiliary heat source without the need for valve switching operations.

The present invention will be described below with reference to embodiments shown in the drawings.

1 is a low-temperature heat source generator that heats and separates a refrigerant from a dilute liquid using solar hot water as a heat source; 2 is a high-temperature generator that heats and separates a refrigerant from a primary intermediate liquid using high-temperature steam as a heat source; 3 is a high-temperature generator that separates the refrigerant from a primary intermediate liquid by heating. A low-temperature generator 4 uses the generated refrigerant vapor as a heat source to reheat the secondary intermediate liquid and further heat and separate the refrigerant. 4 is a condenser that cools and condenses the refrigerant flowing from each of the generators 1, 2 and 3 in a cooler 5. 6 is an evaporator that obtains cold water for air conditioning from a water cooler 7 by using latent heat when the refrigerant liquid from the condenser 4 is dispersed and vaporized; 8 is an evaporator that uses the low temperature heat source generator 1 and the high temperature The refrigerant is appropriately separated by the generator 2 and the low-temperature generator 3, and the concentrated liquid is dispersed to absorb the refrigerant vapor inside the container, thereby maintaining the inside of the evaporator 6 at a low pressure and continuously supplying cold water. Absorbers 9 and 10
is a low-temperature and high-temperature solution heat exchanger, which includes a refrigerant vapor pipe 11°, a refrigerant liquid down-flow pipe 12, a refrigerant circuit 14 with a refrigerant pump 13, a mixed pipe 16 with a dilute liquid pump 15, and an intermediate liquid pump 17. A primary intermediate liquid pipe 18, a secondary intermediate liquid pipe 19, and a concentrated liquid pipe 20 are connected to form an absorption refrigeration cycle.

The low-temperature heat source generator 1 and the low-temperature generator 3 are separated by a partition plate 21 to prevent their liquids from mixing, and are arranged so that the pressure level is the same, and the low-temperature heat source generator 1 and the absorber 8 A side pipe 22 is provided between the absorber 8 and the side pipe 22, which is liquid-sealed with an absorbing liquid during double-effect operation, which will be described later, and which can directly supply the absorbent concentrated in the low-temperature heat source generator 1 to the absorber 8 during single-effect operation. The inlet end of the pipe opens at a position slightly higher than the liquid level of the low temperature heat source generator 1 during dual effect operation.

A solar hot water supply circuit 2 that heats the low temperature heat source generator 1
3 is provided with a hot water three-way valve 24, and a steam supply circuit 25 for heating the high temperature generator 3 is provided with a steam control valve 26, and a heat recovery device 2 for the steam drain generated in the high temperature generator 2 is provided.
7 is arranged in the low temperature heat source generator 1.

Reference numeral 28 denotes a temperature control switch, which is used when the temperature of the solar hot water detected by the hot water temperature detector 29 provided in the solar hot water supply circuit 23 is higher than or close to the set value (including both, it is called near the set value). ) is a steam control valve 26 which is closed on the hot junction H side and which is provided in the steam supply circuit 25 in response to a signal from another hot water temperature detector 30 which is provided in the hot water supply circuit 23.
and when the temperature of the solar hot water is considerably lower than the set value, the temperature control switch 28 closes to the cold junction C side, and the temperature control switch 28 closes to the cold junction C side, and the temperature control switch 28 closes to the cold water temperature sensor 31 provided on the outlet side of the water cooler 7. Adjust steam control valve 26.

Next, the operating state will be explained.

Single-effect operation using Inno solar hot water In this case, sufficient solar hot water is obtained for the load, so the operation of the intermediate liquid pump 17 is stopped.

From the absorber 8 to the low temperature solution heat exchanger 9 by the diluted liquid pump 15
The diluted liquid sent to the low-temperature heat source generator 1 is heated by solar hot water in the generator, boils, generates refrigerant vapor, and is concentrated.

The concentrated absorption liquid passes through the side pipe 21 to the low-temperature solution heat exchanger 9, exchanges heat with the diluted liquid, and is then sprayed into the absorber 8.

The refrigerant vapor heated and separated by the low-temperature heat source generator 1 is liquefied in the condenser 4, sprayed in the evaporator 6, vaporized, and then absorbed in the absorber 8.

Cold water is obtained from the heat of vaporization at this time.

口) Single-duplex combined operation using solar hot water and high-temperature auxiliary heat source, and double-effect operation using high-temperature auxiliary heat source.

In these cases, the temperature of the solar hot water is low relative to the load and the heat input is insufficient, so the intermediate liquid pump 17 is also operated.

From the absorber 8 to the low temperature solution heat exchanger 9 by the diluted liquid pump 15
The diluted liquid sent to the low-temperature heat source generator 1 via the generator is heated and concentrated if solar hot water is supplied to the generator.

Next, this concentrated absorption liquid is sent to the high temperature generator 2 via the high temperature solution heat exchanger 10 by the intermediate liquid pump 17.

This absorption liquid is boiled and concentrated in the high temperature generator 2 using steam, which is an auxiliary heat source, and then sent to the low temperature generator 3 via the high temperature solution heat exchanger 10, where it is further heated and boiled, and then passed through the low temperature solution heat exchanger 9. It is dispersed into the absorber 8.

The refrigerant vapor separated in the high temperature generator 2 is condensed in the low temperature generator 3, and the refrigerant vapor separated in the low temperature generator 3 and the low temperature heat source generator 1 is condensed in the condenser 4, and then in the evaporator 6. It is vaporized and absorbed by the absorber 8.

The heat of vaporization at this time yields cold water as in case a).

As described above, the single-double effect absorption refrigerator according to the present invention includes a low-temperature heat source generator heated by a low-temperature heat source such as solar hot water, a high-temperature generator heated by a high-temperature heat source such as steam,
A low-temperature generator heated by the refrigerant vapor heated and separated by the high-temperature generator, a condenser, an evaporator, an absorber, and a solution heat exchanger are connected to form a refrigeration cycle, and a dilute liquid pump is connected from the absorber to a dilute liquid pump. The intermediate liquid pump is used to circulate the absorption solution to each of the generators, and the intermediate liquid pump is stopped during single-effect operation using a low-temperature heat source. In addition, during dual effect operation using a high-temperature heat source, the diluted liquid pump and intermediate liquid pump were operated to return the absorbed liquid concentrated in each generator to the absorber in sequence. Because of this, it is possible to operate with high thermal efficiency by making maximum use of solar hot water.

Moreover, the operation can be easily changed according to the heat source by simply turning one of the two solution pumps on and off, without requiring a valve switching operation.

In addition, since the solution flows to each generator in series, there is no need to balance the flow rate and concentration, resulting in smooth operation.

[Brief explanation of drawings]

The drawing is a block diagram of a single-double effect absorption refrigerator according to the present invention. 1...Low temperature heat source generator, 2...High temperature generator, 3...
- Low temperature generator, 8... Absorber, 15... Dilute liquid pump, 17... Intermediate liquid pump, 22゛... Side pipe.

Claims (1)

[Claims] 1. A low-temperature heat source generator heated by a low-temperature heat source such as solar hot water, a high-temperature generator heated by a high-temperature heat source such as steam, a low-temperature generator heated by refrigerant vapor thermally decomposed in the high-temperature generator, and a condenser. , an evaporator, an absorber, and a solution heat exchanger are connected to form a refrigeration cycle, and the absorbent solution is guided from the absorber to a high-temperature generator via a low-temperature heat source generator by a dilute liquid pump and an intermediate liquid pump to produce an absorbent solution. The liquid is circulated sequentially through the absorber, low-temperature heat source generator, high-temperature generator, and low-temperature generator, and during single-effect operation using a low-temperature heat source, the intermediate liquid pump is stopped and the dilute liquid pump is operated to absorb water from the low-temperature heat source generator. The concentrated absorption liquid is returned to the absorber via a side pipe, and during dual-effect operation using a high-temperature heat source, a dilute liquid pump and an intermediate liquid pump are operated, and the absorbed liquid that has been concentrated in each generator is returned to the absorber. A single-double effect absorption refrigerator characterized by returning liquid.