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JamesPa
@jamespa
Member
Noble Member
4228 kWhs
Joined: Apr 3, 2023
Last seen: May 15, 2024
Profile Activity
Topics: 4 / Replies: 689
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Reply
RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

I find increasingly staggering that the MCS rules don't require that the heat loss estimated by GIGO spreadsheet be compared with actual consumption, ...

51 mins ago
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Air Source Heat Pumps (ASHPs)
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RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

To give yourself more confidence, look back over the past 3 years and work out the rolling average consumption over (eg) 3 hrs, 6hrs and 24hrs, for ea...

1 hour ago
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Air Source Heat Pumps (ASHPs)
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RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

No your demand cant be 14.3kW. My annual gas usage is 18-20MWh and my measured consumption 7.5, max 8kW. Sadly this appears to be 'situation normal...

4 hours ago
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Air Source Heat Pumps (ASHPs)
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RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

Most mcs contractors I have encountered refuse to take into account measured data, but there are exceptions. Oversized heat pumps can be inefficient....

22 hours ago
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Air Source Heat Pumps (ASHPs)
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RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

Unfortunately sizing heat pumps for a retrofit is very far from a replicable process because the engineer must make assumptions about the fabric which...

24 hours ago
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Air Source Heat Pumps (ASHPs)
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RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?

Mitsubishi 11.2kW is within the pd size limits. Check LG and Panasonic also. Re nobody can get pp, is this for a heat pump or more generally. ...

1 day ago
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Air Source Heat Pumps (ASHPs)
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RE: Heat Pump Truth or Myth#2 - Cycling uses a lot of power and ruins your COP

I understand that A2A heat pumps have better turndown than A2W thus sizing is less critical. I haven't seen the proof that this is true however.

1 week ago
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Air Source Heat Pumps (ASHPs)
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RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore

I don't think that ot is necessarily the case that you buy a HT pump for it's HT capability or that the expectation is to run a HT pump at ht. Manu...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore

It's questionable whether zoning saves money with a heat pump. The saving in lost energy is quite small, and because you need a higher ft as a result...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: New ASHP system - choices

Thats precisely the same conclusion as I have reached. I have challenged MCS on the method they promote. Their response was that they are aware of...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: New ASHP system - choices

My property is 200sq m. Two MCS surveys each taking 3hrs came out at 16kW. They ignored fabric upgrades I told them about and double counted room to...

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP Advice: High Temperature vs. Low Temperature Heat Pump For Microbore

As an example I checked the specs for the 6kW R32 (medium temp) and R290 (HT) Ecodans. They have the same claimed scop at 55C. Obviously there wil...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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