Absorption refrigeration machine

Abstract

A control method of an absorption refrigerator is provided. In a current technic, in order to control a cold water temperature to be a set temperature, an opening degree of a fuel valve of a high-temperature regenerator burner is used as an operation quantity M, when the operation quantity M is controlled by PID control, a variation speed of the cold water temperature is changed based on a setting condition of the absorption refrigerator. In a condition that the variation speed is high, opening degree control of the fuel valve of the burner is also rapidly performed, and is capable of following charge variation, but even if the cold water temperature has little variation during rated operation, the opening degree control of the fuel valve of the burner is also performed, the cold water temperature is varied up and down and is instable. The invention arranges an insensitive region at a positive direction of the operation quantity M (100%) during rated operation, a width of the insensitive region is varied according to a proportion factor P, so as to largen the width of the insensitive region when the variation speed of the cold water temperature is high, and shorten the width of the insensitive region when the variation speed of the cold water temperature is low, thereby tiny variation of the cold water temperature around 100% is absorbed, the cold water temperature is stable.

Description

technical field [0001] The present invention relates to a technique for controlling the operation of an absorption refrigerator by PID control, which is control based on the sum of a proportional term, an integral term, and a differential term. Background technique [0002] In the operation control in which the output of the absorption refrigerator, that is, the cold water temperature is controlled to the set water temperature by using the fuel valve opening degree of the burner of the high-temperature regenerator as the operation amount M, the water temperature is currently quite high compared with the set water temperature. Within the range, set the operating amount M as 100%; in the range where the current water temperature is quite low, set the operating amount as 0%, and when the operating amount M is controlled in proportion to the current water temperature in the range between the above two, it has In order to solve the problem of response delay when some kind of exte...

AI Technical Summary

Problems solved by technology

When the rate of change is fast, the control of the input heat (control of the opening degree of the fuel valve of the burner) is also performed quickly, and it is possible to quickly follow the load fluctuation. , but also to control the input heat (the opening control of the fuel valve of the burner), the temperature of the cold water fluctuates up and down, and it is unstable

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