Method for controlling the superheat temperature of the refrigerant in an evaporator arrangement of a refrigeration system or heat pump system, and a device for implementing the method
US6018959A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a method for controlling the superheat temperature (T.sub.u) 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.sub.u) is controlled in dependence on a comparison between desired and actual values. The desired value (W.sub.2) of the superheat temperature (T.sub.u is varied automatically in dependence on the difference (d) from a reference value (W.sub.1) of a periodically determined function (S) of a number of sampled values of a temperature (T.sub.1 ; T.sub.2) of the refrigerant with the aim of a stable control of the superheat temperature (T.sub.u). 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 (T.sub.2) of the refrigerant at the output of the evaporator arrangement (4) about a mean value of the sampled values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.