A METHOD FOR CONTROLLING A SUPPLY OF REFRIGERANT TO AN EVAPORATOR INCLUDING CALCULATING A REFERENCE TEMPERATURE
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Oct 8, 2015
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Dec 12, 2014
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Abstract
A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1) is disclosed. During a system identification phase an opening degree (12) of the expansion valve (3) is alternatingly increased and decreased, and a maximum temperature difference, (S4−S2)max, between temperature, S4, of air flowing away from the evaporator (2) and temperature, S2, of refrigerant leaving the evaporator (2) is determined. During normal operation, the supply of refrigerant to the evaporator (2) is controlled by calculating a reference temperature, S2,ref, based on the monitored temperature, S4, and the maximum temperature difference, (S4−S2)max, determined during the system identification phase. The supply of refrigerant to the evaporator (2) is controlled in order to obtain a temperature, S2, of refrigerant leaving the evaporator (2) which is substantially equal to the calculated reference temperature, S2,ref.
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