CONTROL APPARATUS AND METHOD OF CONTROLLING HEAT PUMP AND REFRIGERATION SYSTEMS

摘要

A control apparatus performs incremental approach of the set point of overheating of the evaporator of a refrigeration or heat pump system toward the MSS characteristic curve starting with characteristics stored in a storage means, the energy balance of the evaporator being permanently monitored. Instability is identified by evaluating the gradient of the temperature variation at the output of the evaporator. As a reaction to instability the respective set point is incrementally increased. As soon as the actual value for a predetermined time interval is within a tolerance, the system is detected as being stable again, wherein the new set point is stored in the characteristics.