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SCOP and other install advice

hawxby · 2021-04-08T14:24:43Z

Hi, I'm new around here but looking at getting an ASHP installed to replace an oil fired combi-boiler we've been told needs to go one way or another. It's looking like we're going to need something around 12kW, tank, plumbing, etc. It's going to be quite involved. The main question I have is how reliable an indicator are SCOP values of efficiency? I know the chances of hitting the lab SCOP are very unlikely, but it's more a question of if I go for a ASHP with a higher SCOP than another is that likely to translate to the real world. Here is my rough data. Should I be focusing on Grant for improved efficiency or in the real world is that likely to be comparable to Samsung, Mitsubishi, etc? These are the quotes so far, we're waiting for 1 more to come back. Any advice would be greatly appreciated.

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Air Source Heat Pumps (ASHPs)

Last Post by Derek M 5 years ago

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bobbt9866

(@bobbt9866)

Estimable Member Member

Joined: 5 years ago

Posts: 46

14/04/2021 9:55 am

@editor

'SCOP is a new methodology that gives a better indication of expected real-life performance, using COP can be considered using the "old" scale. Seasonal efficiency gives an indication on how efficiently a heat pump operates over an entire cooling or heating season.'

This is factory produced test data which is no more relevant to an individual site than the CoP.

When I select a system I look at the performance at the lowest, realistic ambient temperatures, the correct water temperatures and then look at the other ambients that the system will generally be operating at 90% of the time. This data is freely available.

SCOP is taken at water temperatures of 35 DegC and 55 DegC to comply with EN14825 so could be used to compare manufacturers but is not that accurate for individual projects.

👍

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