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METHOD FOR CONTROLLING LEVEL OF LIQUID WITHIN AN EVAPORATOR AND A SYSTEM THEREOF
METHOD FOR CONTROLLING LEVEL OF LIQUID WITHIN AN EVAPORATOR AND A SYSTEM THEREOF
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机译:蒸发器内液位控制方法及其系统
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摘要
A method controls the level of liquid within an evaporator of a flooded-type chiller without level sensors. The flooded-type chiller includes at least one compressor, a condenser, an expansion valve and an evaporator. A number of sensors positioned in the system measures a number of first parameter information values. A controller calculates a number of second parameter information values based on the measured first parameter information values and further determines a virtual refrigerant level as a control signal based on the second parameter information values. Based on the determined virtual refrigerant level, the controller opens, closes or holds the expansion valve with respect to a dead zone for maintaining a pre-defined target refrigerant level so as to provide the desired refrigerant level and oil in the evaporator.
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