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What is the use of hot gas bypass valve?

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Question ajoutée par Sijin Kalathil CRPEP certified category C Mechanical Engineer , QA QC Inspector Mechanical , Delta Construction W. L. L
Date de publication: 2016/04/30
syed tahmul ullah hussaini
par syed tahmul ullah hussaini , SENIOR MECHANICAL ENGINEER , SAUDI BINLADIN GROUP

A hot gas valve is installed behind  the expansion valve of  the low side of gas line and is used during defrost conditions heating of liquid before it again enters the evaporator.

MUDATHER MOSTAFA  ABOTALEB
par MUDATHER MOSTAFA ABOTALEB , MEP Construction Manager-(PMP®) , Giza Systems

When diminishingloads force a refrigeration system tooperate at unstable conditions,compressor and evaporator capacitiesbalance at ever lower suction pressuresand temperatures. Unchecked, theeventual result is coil frosting andcompressor flooding

 to prevent condensate from freezing on the surface of the evaporator coil when the system is operating at extremely low load conditions.

Sahuri Muchtar
par Sahuri Muchtar , Senior MEP Engineer , SHIMIZU CORPORATION, General Contractor

Hot Gas Bypass is a control system that is used must be able to keep the engine operating at the level of the most economical to regulate consumption of energy used at the time adapted to the needs of the load. E.g. consumption of water, fuel or electricity consumed at the time of air conditioning load drops below its nominal design. For the compressor must be equipped with a capacity control system for example by using a tool called: Hot Gas Bypass, Auto Unloader and multispeed compressors or compressor parallel.

 

Control system using control devices called Hot Gas Bypass Valve. In this system, a bypass valve installed between the high pressure side compressor (discharge line) and the low pressure side (suction line). This valve set will open its valve when the difference between the high pressure and low pressure has reached a certain price point suitable valve arrangement of its (setting). Valve opens when the pressure reached a low point evaporation dangerous, and will close when the suction pressure has gone up back at the price of safety. In this system, to reduce the capacity of the compressor, hot gas from the compressor directly channeled into the evaporator through a bypass channel controlled by solenoid stop valve and modulating hot gas bypass valve.

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