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Re: Desuperheaters
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Posted by Robert Gammon on Thursday, 24 April 2008, at 7:55 a.m.,
in response to Re: Desuperheaters, posted by canuckmx5
I have to agree. They MUST warn people of the erosion effect. When average folks see the 0.4 GPM per ton and say "Wow, what will this thing do if I put 3 GPM per ton thru it just like the primary loop?"
One, that takes ALOT of pump power to do, head loss at 3GPM per ton is very high
Two, erosion will perforate something in the desuperheater in a matter of months. Leaks will result, and desuperheater performance will suffer.
Bottom line, we do not know what GPM rate above 0.4GPM per ton will be safe. Water temp will drop with increased flow rate, but total heat transferred should go up. 0.5, 0.6 GPM should be safe. Above 1 GPM per ton, and we may be in dangerous operational territory.
Depending on what total head loss thru the desuperheater, the external piping, and the DHW tank is, a UP 15-100 COULD push MORE than 1 GPM per ton thru the desuperheater on heat pumps smaller than 6T.
A diligent installer might measure the desuperheater flow rate at install time, and at each service interval, and suggest various things (descaling, UP 15-100 pump with flow control valve...extra head for the pump to work against) to put things back to spec
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