Results 1 to 6 of 6
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23-03-2007, 10:48 PM #1
capacity control for 100% fresh air dx system
hi
I would like to assemble a DX system with 100% fresh air.
I know that I have to use some capacity control system.
If I want to use hot gas bypass, which electronic controller I should use,
and what will be my controlling parameter? (limiting suction pressure, setting leaving air temperature from the coil ...??) and how??
Best regards
Coskun
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24-03-2007, 11:45 AM #2
Re: capacity control for 100% fresh air dx system
Suction pressure is the way to go.
As for the application, I would install a self regulated hot gas bypass, without any electronics. Sporland, Danfoss and other have it in the their catalogue.
I would prefer chilled water, anyway.
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24-03-2007, 07:01 PM #3
Re: capacity control for 100% fresh air dx system
Self regulating hot gas bypass is ok but
I want high precision controll of set point as well
If I chose electronic controlle one what shall I do??
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25-03-2007, 12:53 AM #4
Re: capacity control for 100% fresh air dx system
If you want high precision, you need a very fast modulating bypass valve and will cost an arm and a leg. Been there, done that, doesn't satisfy. Electronic control is not a guarantee of good control.
I would go with chilled water coil.
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26-03-2007, 03:50 AM #5
Re: capacity control for 100% fresh air dx system
Try here: http://www.rawal.com/ these will give you precision control.
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26-03-2007, 07:52 PM #6
Re: capacity control for 100% fresh air dx system
I checked the site, it looks like ordinary hot gas bypass valve. what is the benefit or difference?