Re: [TRNSYS-users] Type 927 (Water to Water Heat Pump)

["Matt Duffy" <duffy@tess-inc.com>]

Dear Andrey,

I briefly took a look at your *.tpf and saw many flaws that need
correction. The heat pump needs a controller. The heat pump/tank loop
needs a pump. You also do not want the outlet of the solar collector being
the inlet of you heat pump - you usually want the outlet of your solar
collector going to the top of your tank, and if there is no solar, then
turn on your heat pump for auxiliary energy.

Best regards,

Matt Duffy

----- Original Message -----
From: "Andrey Vyshnepolsky" <andrey.vyshnepolsky@rwth-aachen.de>
Sent: Thu, January 6, 2011 11:17
Subject:[TRNSYS-users] Type 927 (Water to Water Heat Pump)


Hello,

I am simulating a DHW-System where the heat is provided by a flat plate solar
collector. Between the collector circle and the water tank circle I have
put in a
water-to-water heat pump (Type 927). The main idea behind this is to
replace the
auxiliary heater of the water tank. Sadly the heat pump doesn't work right:

The plotter shows a value of nearly zero for the gain heat of the
collector and the
heat transfer to the load circle of the heat pump is lower than the
supplied power
to the pump. But for me the heat pump shall follow this equation: Heat_source
(=Heat_coll) + Power_pump = Heat_load.

A further question is: is it allowed to change the temprature and mass
flow values
in the performance data files of the heat pump?

For a better understanding I have attached the working file.

Thank you very much for any kind of help in advance.

With best regards,

Andrey

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----- End of original message -----