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

PCT No. PCT/DK96/00073 Sec. 371 Date May 8, 1998 Sec. 102(e) Date May 8, 1998 PCT Filed Feb. 19, 1996 PCT Pub. No. WO96/26399 PCT Pub. Date Aug. 29, 1996In a method for controlling the superheat temperature (T+E,uml u+EE ) 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 and a controllable expansion valve (4) are arranged in succession in a closed circuit. The superheat temperature (T+E,uml u+EE ) is controlled in dependence on a comparison between desired and actual values. The desired value (W2) of the superheat temperature (T+E,uml u+EE 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 (T+E,uml u+EE ). 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.