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Setback savings - fact or fiction?

 
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Air Source Heat Pumps (ASHPs)
Last Post by BobTSkutter 2 days ago
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 BobTSkutter
(@bobtskutter)
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569 kWhs
Joined: 2 months ago
Posts: 91
15/03/2025 6:33 pm  

Posted by: @jamespa
↑

However others have said that 5C

The lower the DT the higher the flow rate.

The lower the DT on the heating water side, the hotter the average temperature of the heat emitter, so the the heat emitter can be smaller.  You did mention this. = cheaper.

The higher the flow rate the more noise.

The higher the flow rate the higher the heat transfer coefficient in the plate exchanger in the ASHP so the smaller the plate can be = cheaper.

The higher the flow rate the easier it is to get the flow to split equally at t junctions, because the flow will be be in the turbulent regime at all points in the system.  Which makes the pipework installation easier, in theory, therefore faster to install therefore cheaper.

If the plate exchanger is too small it might not be able to condense all the refrigerant so that could lead to energy being wasted over the depressuring valve.

Just some random thoughts

Bob

(my typing is really bad tonight, i hope my ramblings make some sort of sense)

This post was modified 2 days ago by BobTSkutter

   
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