Zhe,
The answer to your question depends on the way that your system is
designed. In the real (as opposed to the simulation) world,
typically, single stage heat pumps do not have any internal control
over their outlet temperature. Their compressors are either on or
off and the outlet temperature is dependent only on the inlet and
the environmental conditions. Any control on outlet temperature
would be done using thermostats, diverting valves, tempering valves,
etc. Type941 models a single stage heat pump so any outlet
temperature control should be done using other Types so as to match
the design of the system.
In recent years, multistage heat pumps and (at least in one
manufacturer's case) variable speed compressor heat pumps have come
on the market. These do have some control on outlet temperature. If
you are trying to model the performance of a heat pump that has a
variable speed compressor in it, you won't be very well served by
using Type941 I am afraid. I wrote a model of such a heat pump that
is available from a specific manufacturer and would be happy to
correspond with you about it directly if you are interested.
Kind regards,
David
On 7/6/2012 05:29, Zhe Li wrote:
Dear Trnsys user,
Thanks for your time.
I am currently using air-water heat pump
(type 941) for my model. I understand this is a relatively new
component in Trnsys, Would be possible if anybody can let me
know how to set a limit temperature for the exiting fluid from
the heat pump?
Thank you very much in advance,
Zhe Li
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David BRADLEY
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Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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