Adaptive defrost system
US4884414A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1987 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Aug 26, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2700/14
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A defrost system adapted for use with refrigeration or heat pump systems wherein an evaporator coil defrost cycle is adaptively modified in response to changing environmental conditions. Under normal conditions, a defrost operation is effected at the end of a period of frost accumulation. The period of frost accumulation is adjusted in accordance with deviation from a desired defrost time of the time required to raise the temperature of the coil from a first predetermined temperature to a second predetermined temperature. If a predetermined maximum defrost period is exceeded, the frost accumulation period is set to a predetermined value. During the frost accumulation period, the differential between the temperature of the coil and ambient temperature is determined, and the frost accumulation period terminated and a defrost operation initiated if temperature differential exceeds a target differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.