JPS6148066B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an absorption refrigerator that utilizes solar heat, uses low-temperature water as the main heat source, and steam or other high-temperature heat sources as an auxiliary heat source.It fully utilizes solar heat and is stable even under partial load. The purpose is to control the capacity so that it can be operated.

Generally, in a single/double effect absorption chiller that uses low-temperature water generated by solar heat as a heating source and a high-temperature heat source such as steam or combustion gas, the steam control valve is controlled depending on the chilled water outlet temperature, but low-temperature water generated by solar heat is also input. When it is added as heat, it is desirable to maximize the use of low-cost solar-heated low-temperature water by reducing the supply of high-temperature heat sources by an amount equivalent to the heat input.

The present invention has been made in view of the above points, and an embodiment shown in the drawings will be described below.

The present invention will be described below with reference to embodiments shown in the drawings. 1 is a low-temperature heat source generator that uses solar hot water as a heat source to heat and separate the refrigerant from the dilute liquid; 2 is a high-temperature generator that uses steam as a heat source to heat and separate the refrigerant from the primary intermediate liquid; 3 is the high-temperature generator that separates the refrigerant from the primary intermediate liquid by heating. A low-temperature generator that reheats the secondary intermediate liquid using refrigerant vapor as a heat source and further heats and separates the refrigerant; 4 is each of the generators 1, 2,
A condenser 6 cools and condenses the refrigerant flowing in from the condenser 4 with a cooler 5, and a condenser 6 obtains cold water for air conditioning from a water cooler 7 by using the latent heat when dispersing and vaporizing the liquid refrigerant from the condenser 4. The evaporator 8 includes the low-temperature heat source generator 1, the high-temperature generator 2, and the low-temperature generator 3.
Absorbers 9 and 10 are capable of maintaining the inside of the evaporator 6 at a low pressure and continuously supplying cold water by scattering a concentrated liquid in which the refrigerant is appropriately separated and absorbing the refrigerant vapor inside the container. is a low-temperature and high-temperature solution heat exchanger;
4. A dilute liquid pipe line 16 having a dilute liquid pump 15, a primary intermediate liquid pipe line 18 having an intermediate liquid pump 17, a secondary intermediate liquid pipe line 19, and a concentrated liquid pipe line 20 are connected to form an absorption refrigeration cycle. are doing.

The solar hot water supply circuit 21 that heats the low temperature heat source generator 1 is provided with a hot water three-way valve 22, and the steam supply circuit 23 that heats the high temperature generator 2 is provided with a steam control valve 24. A heat recovery device 25 for the generated steam drain is disposed in the low temperature heat source generator 1.

The hot water three-way valve 22 is connected to the solar hot water supply circuit 21
hot water temperature regulator 2 that operates according to the hot water inlet temperature of
6 and is also controlled by a cold water temperature regulator 28 which operates according to the cold water outlet temperature of the water cooler 7 via a control switch 27.

The steam control valve 24 is controlled by a cold water temperature regulator 29 that is operated according to the cold water outlet temperature of the water cooler 7, and the steam control valve 24 is controlled by a hot water temperature regulator 30 that is operated according to the hot water inlet temperature of the hot water supply circuit 21. The valve 24 is compensated.

Next, we will explain the operation of an absorption chiller designed to have a solar hot water temperature of 90°C and a chilled water outlet temperature of 10°C at maximum load.

(a) Single-duplex combined operation and dual-effect operation Normally, the opening degree of the steam control valve 24 is determined by the chilled water outlet temperature, so when the maximum load is 10°C, the operation of the steam control valve 24 is as shown in Figure 2. controlled by. Therefore, when the cold water outlet temperature is 9.5°C, the opening degree of the steam control valve 24 is 75%.

Therefore, if the steam control valve 24 is compensated by the hot water inlet temperature of the hot water supply circuit 21 by 10%, when the hot water inlet temperature is 80°C, the maximum opening of the steam control valve is set to 50%, and according to the line in Figure 2, The opening degree of the steam control valve 24 is controlled. In this case, single and double operation will be performed using solar hot water and steam as heat sources.

That is, when the cold water outlet temperature is 9.5° C., the opening degree of the steam control valve 24 is 25%.

Furthermore, when the hot water inlet temperature becomes lower than, for example, 60°C, which is lower than the temperature of the dilute liquid flowing into the low-temperature heat source generator 1, the hot water temperature controller 26 operates to close the hot water three-way valve 22, automatically relying only on the steam heat source. This results in double effect operation.

(B) Single-effect operation When the solar hot water is at 90°C or higher, the steam control valve 24 is fully closed by the operation of the hot water temperature regulator 30, resulting in single-effect operation with only the solar hot water as the heat source.

In this case, the primary intermediate liquid pump 17 is stopped by the opening signal (fully closed) of the steam control valve 24, and the control switch 27 is set to the C side, so that the chilled water temperature regulator 2
8 controls the hot water three-way valve 22 as shown in FIG.

Further, when the cold water temperature falls below a predetermined value, the cold water/hot water regulator 28 stops both the refrigerant pump 13 and the primary intermediate liquid pump 17.

Furthermore, when solar hot water is used, there are cases where the solar hot water is not available at the planning stage for the refrigeration capacity. In other words, the required refrigeration capacity is 100 refrigeration tons, and the maximum refrigeration capacity that can be obtained using solar hot water as a heat source is 50 refrigeration tons.

In this case, a single-effect operation using solar hot water as a heat source would yield 50 refrigeration tons, and a double-effect operation using steam as an auxiliary heat source would yield 100 refrigeration tons.

At this time, the control is to compensate for the hot water inlet temperature by 5%.
Therefore, when the hot water inlet temperature is 85° C., the maximum opening degree of the steam control valve is 62.5%, and the steam control valve 24 is controlled according to the line in FIG. Furthermore, in the embodiment shown in the figure, a case has been described in which a steam control valve is used as a control valve for the supply amount of a high-temperature heat source, but a flow rate control valve for fuel such as kerosene or gas may also be used as the control valve. Of course it's a good thing.

As described above, the present invention relates to a low-temperature heat source generator using solar hot water as a heat source, a high-temperature generator using steam or other high-temperature heat source as a heat source, and a low-temperature generator using refrigerant vapor separated by the generator as a heat source. In an absorption chiller that forms a refrigeration cycle by connecting a condenser, an evaporator forming a water cooler, an absorber, and a solution heat exchanger, a hot water three-way valve controlled by the chilled water outlet temperature is provided in the solar hot water supply circuit. At the same time, the supply circuit of the high-temperature heat source is provided with a flow rate control valve that is controlled by the cold water outlet temperature, and the control valve is compensated by the hot water inlet temperature. When an absorption refrigerator is operated using a high-temperature heat source as an auxiliary heat source, it is possible to make maximum use of solar heat and to perform stable and economical control even during partial load.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of an absorption chiller equipped with a control device according to the present invention, Fig. 2 is a control characteristic diagram of a steam control valve when compensation is applied based on hot water inlet temperature, and Fig. 3 is a diagram showing control characteristics based on cold water outlet temperature. It is a control characteristic diagram of a hot water three-way valve. 1...Low temperature heat source generator, 2...High temperature generator, 7
... Water cooler, 21 ... Solar hot water supply circuit, 22
...Hot water three-way valve, 23...Steam supply circuit, 24...
...Steam control valve, 30...Hot water temperature regulator, 29...
...Cold water temperature regulator.

Claims (1)

[Claims] 1. Low-temperature heat source generator that uses solar hot water as a heating source;
A high-temperature generator that uses steam or other high-temperature heat sources as a heating source, a low-temperature generator that uses refrigerant vapor separated by the generator as a heating source, a condenser, an evaporator that forms a water cooler, an absorber, and a solution heat exchanger. In an absorption chiller that connects a refrigeration cycle, the solar hot water supply circuit is equipped with a hot water three-way valve that is controlled by the cold water outlet temperature, and the high temperature heat source supply circuit is equipped with a flow rate control valve that is controlled by the cold water outlet temperature. 1. A control device for an absorption refrigerator, characterized in that the control valve is provided with compensation based on the hot water inlet temperature.