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Replies:
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| kimmy
 |  "Re(1):Hot gas defrost systems"
, posted Sun 23 Sep 22:37  
This is a popular system in the sixties to control capacity.
Increase the pressure and engage the idle cylinders to keep the pressures in the controlled areas of their temps.
30+ years in the HVAC/R trade.
Started when equipment was repaired not replaced.
Still feel the same way.
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| Chiller guy
| "Re(1):Hot gas defrost systems" , posted Thu 26 Apr 17:09
You are talking about two different uses of the same process. Anyone who works on heat pumps probably has experience here. Hot Gas By-Pass is generally a different animal than Hot Gas Defrost. They are employed to accomplish different goals. What are you trying to accomplish? What is your question?
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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| | steveaus
| "Re(2):Hot gas defrost systems" , posted Fri 27 Apr 01:01
Just after general information regarding heat pumps.
I'm under the impression that hot gas by-pass can be used indirectly as a frost deterrent, but it's reason for being is load balancing?
Cheers for the reply.
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| | chiller guy
| "Re(3):Hot gas defrost systems" , posted Fri 27 Apr 07:30
Hot Gas By-pass can be employed to keep an evap temp at a steady state, impose a false load on a unit, or hold tight temp/humidity conditions. It is an energy hog, requires additional piping and controls, a larger refrigerant charge, and requires some expertise to set up and keep running properly. However; there are uses for it.
In todays world you will often find different frost control methods such as "off cycle" defrost. Here the compressor is cycled off while the fan continues to run until the frost is gone.
Hope this helps
All refrigerants are safe - All refrigerant are dangerous. The difference is YOU !!!
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