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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 22, 2025
Profile Activity
Topics: 17 / Replies: 2890
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RE: What do we need to know before installing a heat pump?

You are mixing up cause and effect. The heat delivered by the heat pump to the system absolutely is equal to (mass) flow rate * specific heat capacit...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

@cathoderay Reading the above I think there is a large measure of agreement that the difference in operating conditions vs the oil boiler, and ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

One further comment occurs. We know that cycling is bad news, but we cant quantify how much effect this has when the unit is below minimum output. ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

When I asked the question I was thinking secondary. A 3 bed house may be quite a lot smaller than the designers of a 14kW unit were thinking. I have...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

@cathoderay My simple view is this: They have losses, so they increase the flow temp required at the ASHP to achieve a given flow temp at the emitter...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

Frist reactions (more considered ones later...) Indeed so. Cycling is said to be ruinous to efficiency but I have never seen the extent to w...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

As I indicated in my previous post, I simply don't believe this. I think its an apparent/real SCOP problem not house needs 3 times as much energy to ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

@cathoderay I just had a look back again and spotted this part of one of the plots you posted, where the current in (and to some extent the LWT) is ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

@cathoderay Lots of data here. Firstly I would start by reframing your question from 'why does my house take more energy to heat using ASHP tha...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

@cathoderay Lots of data here. Firstly I would start by reframing your question from 'why does my house take more energy to heat using ASHP tha...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

Completely agree here. However, reducing it to the basics which I think we know irrespective of assumptions about COP or the accuracy of data from th...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

I had understood the figures provided by @cathoderay to be measured electricity consumption (8 ish MWh/year) which he had multiplied by an assumed CO...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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