Ishiko, Hideo;

Absorption refrigerating apparatus control method

To eliminate great increases in regeneration temperature and pressure and prevent the stoppage of an absorption refrigerating apparatus for safety upon a rise in the temperature of cooling water as well as to prevent crystallization and reduce fuel costs upon a reduction in the temperature of cooling water, the absorption refrigerating apparatus comprises a controller 34 which is constituted such that the opening of a fuel control valve 21 is controlled to a range of 0 to 100% to control the amount of heating in a high-temperature regenerator 1 when the inlet temperature T2 of cooling water is between a variable low-temperature set value and a variable high-temperature set value.

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What is claimed is:

1. A method for controlling the amount of heating in a regenerator of an absorption refrigerating apparatus having an absorber and an evaporator, wherein the amount of heating in the regenerator is dependent upon the opening of a fuel control valve, and wherein cooling water is supplied to the absorber and cold water is removed from the evaporator, said method comprising the steps of:

determining a maximum value for the opening of the fuel control valve based upon the inlet temperature of cooling water supplied to the absorber; and

controlling the amount of heating in the regenerator by controlling the opening of the fuel control valve based upon the outlet temperature of cold water removed from the evaporator, independent of the inlet temperature of cooling water supplied to the absorber, until the opening of the fuel control valve reaches the maximum value, at which point the opening of the fuel control valve is limited to the maximum value.

2. The method as defined in claim 1, wherein said step of determining a maximum value for the opening of the fuel control valve comprises the steps of:

setting a low-temperature value for the inlet temperature of cooling water supplied to the absorber;

setting a high-temperature value for the inlet temperature of cooling water supplied to the absorber;

determining that the maximum value for the opening of the fuel control valve is 100% when the inlet temperature of cooling water supplied to the absorber is between the low-temperature value and the high-temperature value; and

determining that the maximum value for the opening of the fuel control valve is decreased from 100% when the inlet temperature of cooling water supplied to the absorber falls below the low-temperature value or exceeds the high-temperature value.

3. The method as defined in claim 2, wherein said step of determining that the maximum value for the opening of the fuel control valve is decreased from 100% when the inlet temperature of cooling water supplied to the absorber falls below the low-temperature value or exceeds the high-temperature value comprises the steps of:

determining that the maximum value for the opening of the fuel control valve is decreased by approximately 10/9% for every 1.degree. C. decrease in the inlet temperature of cooling water supplied to the absorber when the inlet temperature of cooling water supplied to the absorber is lower than the low-temperature value; and

determining that the maximum value for the opening of the fuel control valve is decreased by approximately 10% for every 1.degree. C. increase in the inlet temperature of cooling water supplied to the absorber when the inlet temperature of cooling water supplied to the absorber is higher than the low-temperature value.

4. A method for controlling the amount of heating in a regenerator of an absorption refrigerating apparatus having an absorber and an evaporator, wherein cooling water is supplied to the absorber and cold water is removed from the evaporator, said method comprising the steps of:

determining a maximum value for the amount of heating in the regenerator based upon the inlet temperature of cooling water supplied to the absorber; and

controlling the amount of heating in the regenerator based upon the outlet temperature of cold water removed from the evaporator, independent of the inlet temperature of cooling water supplied to the absorber, until the amount of heating in the regenerator reaches the maximum value, at which point the amount of heating in the regenerator is limited to the maximum value.

5. The method as defined in claim 4, wherein said step of determining a maximum value for the amount of heating in the regenerator comprises the steps of:

setting a low-temperature value for the inlet temperature of cooling water supplied to the absorber;

setting a high-temperature value for the inlet temperature of cooling water supplied to the absorber;

determining that the maximum value for the amount of heating in the regenerator is 100% when the inlet temperature of cooling water supplied to the absorber is between the low-temperature value and the high-temperature value; and

determining that the maximum value for the amount of heating in the regenerator is decreased from 100% when the inlet temperature of cooling water supplied to the absorber falls below the low-temperature value or exceeds the high-temperature value.

6. The method as defined in claim 5, wherein said step of determining that the maximum value for the amount of heating in the regenerator is decreased from 100% when the inlet temperature of cooling water supplied to the absorber falls below the low-temperature value or exceeds the high-temperature value comprises the steps of:

determining that the maximum value for the amount of heating in the regenerator is decreased by approximately 10/9% for every 1.degree. C. decrease in the inlet temperature of cooling water supplied to the absorber when the inlet temperature of cooling water supplied to the absorber is lower than the low-temperature value; and

determining that the maximum value for the amount of heating in the regenerator is decreased by approximately 10% for every 1.degree. C. increase in the inlet temperature of cooling water supplied to the absorber when the inlet temperature of cooling water supplied to the absorber is higher than the low-temperature value.