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Thread: Controlling head-pressure
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24-03-2010, 03:25 AM #1
Controlling head-pressure
I'd like to investigate & debate the various methods used to control head-pressure in rhvac systems.
The simple ones first:
1. Fan speed control for air-cooled condensers;
2. Water flow control for water-cooled condensers.
There are number of others. I'd be interested in exploring the merits of the various methods, in terms of effectiveness, ease-of-control, stability, reliability, energy usage, cost.
A few questions to kick off:
a. What happens if the ambient temperature is very cold & cools the condenser too much, resulting in a low discharge pressure at startup?
b. Can head-pressure control result in rapid swings in condensing temperature/pressure?
c. What happens if a temp/pressure sensor controlling water pump speed, is overly sensitive?
d. What happens if the water pump cavitates - what effect does this have on the condenser?Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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