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Type 941 (air-to-water heat pump) - problem with exiting fluid temperature control

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Topic starter

Dear All,

I am a novice TRNSYS user and I am modelling a system with an air-to-water heat pump (type 941) with a buffer tank (type 534) and a heat receiver in the form of a low-temperature radiator (type 1231). The system would operate over a temperature range of -10°C to 15°C.

I would like to use weather control, whereby the temperature of the fluid exiting the heat pump would increase as the outside temperature decreases. Regardless of the control I use, I cannot achieve the desired effect and the opposite happens - the temperature at the exit of the heat pump keeps rising as the outside temperature increases.
 
I would be grateful for any help.
This topic was modified 3 months ago by AOtrnsyspl
1 Answer
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@aotrnsyspl

Type941 models an on/off heat pump whose compressor can only run at one speed. In order to vary the outlet fluid temperature, a heat pump needs to have a variable speed compressor. There are models of variable speed compressor heat pumps available in the updated (v18) TESS HVAC library.

kind regards,

 David

 

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