Hot gas bypass defrosting system
US5065584A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Jul 30, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B47/022
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A refrigeration system including a compressor, condenser, capillary tube and evaporator includes a hot gas bypass defrosting capability provided by a bypass means around the capillary tube. Defrosting is achieved by the use of hot, uncondensed refrigerant, without requiring a reversal of the flow of refrigerant through the system. An exemplary bypass means includes a solenoid valve and associated tubing to form an alternate, low restriction path for the refrigerant to bypass the capillary tube. When the solenoid valve is closed, refrigerant is forced through the capillary tube for normal refrigeration. However, when the solenoid valve is open, condensation of refrigerant in the condenser is inhibited, and hot refrigerant gas is delivered directly to the evaporator for defrosting. The solenoid valve is controlled in response to the total accumulated running time of the compressor for improved control of the defrosting cycles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.