Defrost design of air-cooled heat pump unit

Air-cooled Heat pump unitDefrost design:
Shanghai Han cold air heat Pump Unit defrost principle:
A. Use the most advanced and effective "hot gas reverse" method defrost; B. The coil is not necessarily frost-bound, there is frost will not be in line with economic benefits; C. After the research and test report proved that the coil tube frosting 50%~60% began to cream, the most consistent with the economy of use; D. The shorter the cream, the better. The logic of the defrosting mode is realized by the microcomputer control software developed by our company. A. Temperature detection; B. Frost temperature detection on the surface of the coil; C. Setting and controlling of the defrosting cycle; D. Time detection of the defrosting process; E. After the surface of the coil is finished, the temperature is detected; F. Control of fan stop and start; G. Rongshui of ice or water vapor after defrosting; H. Monitoring of refrigerant pressure during defrosting; I. Restoration of instantaneous protection of heating The measure of the compressor torsion;

The main characteristics of Shanghai Han cold air cooling and heat pump unit defrosting technology:
A. Defrost start and end process of compressor without downtime (by micro-computer program control), so that the compressor Kai-stop than other defrost way to reduce more than 60%, increase the service life of the compressor, increase the heating time of the unit, improve the use efficiency of the unit.
B. Defrost at the end of the first to start the blower blow dry coil, the technology can avoid defrosting when the melting water in the coil on the icing, can greatly extend the unit's defrost cycle.
Defrost period is greater than 60 minutes, general Air heat pump unit defrost cycle in about 45 minutes, Shanghai Han-cold company in the years of research and development based on the use of computer control system of accurate detection, as well as the adoption of bypass measures, and the blow drying technology, so that defrost cycle greatly extended.
C. Shorten the defrost time, using scientific detection methods, and the coil tube row, so that defrost speed is accelerated. General defrost time is not less than 3 minutes.
D. Because of the above, the energy loss of defrosting of air-cooled heat pump unit is greatly reduced. General heat pump unit, defrost energy loss of about 10~15% (defrost cycle is greater than 60 minutes, defrost time 70-90 seconds), and the Han cold air heat pump unit defrost energy loss of about 7%.