METHOD FOR CONTROLLING THE SUPERHEAT TEMPERATURE OF THE REFRIGERANT IN AN EVAPORATOR ARRANGEMENT OF A REFRIGERATION SYSTEM OR HEATPUMP SYSTEM, AND A DEVICE FOR IMPLEMENTING THE METHOD

摘要

In a method for controlling the superheat temperature (Tü) of the refrigerant in an evaporator arrangement (1) of a refrigeration system or heat pump system (1-4), the evaporator arrangement (1), a compressor arrangement (2), a condenser (3) and a controllable expansion valve arrangement (4) are arranged in succession in a closed circuit. The superheat temperature (Tü) is controlled in dependence on a comparison between desired and actual values. The desired value (W2) of the superheat temperature (Tü is varied automatically in dependence on the difference (d) from a reference value (W1) of a periodically determined function (S) of a number of sampled values of a temperature (T1; T2) of the refrigerant with the aim of a stable control of the superheat temperature (Tü). To achieve optimum filling and to optimize the superheating in such systems, provision is made for the said function (S) to characterize the variability of a number of sampled values of the temperature (T2) of the refrigerant at the output of the evaporator arrangement (4) about a mean value of the sampled values.