Carol,
A single-stage heat pump is either ON or OFF. There is no
variation on the speed of the compressor so the heat pumps capacity
is only a function of the inlet water conditions. In a two-stage
device, either there are two compressors or there is a single
compressor that can run at two different speeds. The heat pump's
capacity now depends upon the inlet conditions and on the speed of
the compressor. It basically has a "high heating/cooling" mode and a
"low heating/cooling" mode.
Kind regards,
David
On 8/31/2012 07:06, Pascual Ortiz,
Carol wrote:
Hi TRNSYS users,
I would like to simulate
water to water heat pump but I don’t know which type I
have to use, Type 927 or type 1221? I have read that the
difference between them is the stage number, can anyone send
me some information about parameters/inputs/outputs to know
what type fits better to my model?
Thanks in advance,
Kind Regards
Carol
Pascual
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
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d.bradley@tess-inc.com
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