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stuartornum
@stuartornum
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Joined: Jan 18, 2024
Last seen: Feb 12, 2025
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Topics: 2 / Replies: 18
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Here is some actual data we can discuss (link to data): Hypothesis: does reducing the flow rate on a DHW cycle increase the dT, allowing more time f...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

I have an NRG Zone and the DHW circuit is taken off one of the "zones". This "zone" has a dedicated circulation pump which I have reduce the speed on....

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Lets prove it with a fairly simple test. We do a lot of talking about this stuff in this industry, yet I do not see much empirical evidence... anywher...

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

I have temp sensors on the flow and return of the DHW circuit. I've reduced the pump speed from 3 to 1 for todays cycle/test (roughly 23L/min to 10L/m...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

This is a very valid point, one that could be modelled out quite easily

6 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Here you go: GitHub It works for my Riello NHXM, which should be identical to the Midea M-Thermal, Clivet Edge, Bosch CS2000AWF... Please don't ju...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

First of all, let me set the scene for our "average" customer who wants a HP (South Devon): HP's still costs significantly more than a direct replac...

7 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Great point to clarify, thank you for commenting! I'm absolutely not wanting to be associated with being 3x oversized, that is just insane. We're cu...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Hi James, firstly - thank you for contributing to this discussion, it's very much appreciated and quite enjoying the challenging of the ideas/concepts...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Yes, this is what I believe to be the case. The theory has two principles. 1. Ignoring pure weather compensation, instead run the HP in its most o...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Yep, can’t disagree with that. I must admit, I was highly motivated by performance and everything else was an afterthought.

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

I would like to agree with you, I really would. However, the data (my HP) shows otherwise. Oversizing is not as detrimental as people are led to belie...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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