Sizing of heat pumps
@bobbt9866, so do Freedom make their own ASHPs? I was not aware of that if they do.
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@editor no they are just a supplier of them. Mine is coming from them, via an installer
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We have a Clivet 6.1 (12 kW). The datasheet provides output figures for OAT of 7, 2 and -7, at set water temperatures.
Is there somewhere where we can find the heating output at specific design temp (-2)/flow temps, or is it a case of querying with the manufacturers? Just wondering how installers decide the right capacity when it isn't overly clear from what I can see, even from the datasheets.
Posted by: @bensonWe have a Clivet 6.1 (12 kW). The datasheet provides output figures for OAT of 7, 2 and -7, at set water temperatures.
Is there somewhere where we can find the heating output at specific design temp (-2)/flow temps, or is it a case of querying with the manufacturers? Just wondering how installers decide the right capacity when it isn't overly clear from what I can see, even from the datasheets.
I agree it's not very helpful. Generally, the max heat output at -2C is going to be a little lower (maybe 3-5%) that the figure at -7C. That may sound counter-intuitive, but it's because of the likelihood of defrost cycles occurring at -2C, whereas the air is 'dryer' (less moisture) at -7C so less likely to encounter frosting / defrost cycles which reduce the overall amount of available heat. Anyway, the figures for 2C, -2C and -7C are not going to be a million miles apart, and if they are very close to your heat loss then you probably want to go for a larger heat pump. Most heat loss surveys are going to contain far larger variances (or errors) than the variances between manufacturers output data at 2C, -2C and -7C OATs
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