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Last seen: Sep 19, 2024
@jamespa I am surprised that the school did not opt for GSHP's, since they are much quieter, can be installed inside,and probably would be more effi...
Don't panic. It was a hypothetical answer that I supplied, since the required conditions are not possible to achieve even using a modeling tool. I a...
I performed the test that was requested, which was 12 hours @ 10C, then 12 hours @ 20C. I'm not certain what was the purpose of the test or its useful...
@jamespa I can assure you that I was not being combative, merely having some fun, otherwise I would have given my usual warning 'that I don't take p...
You required a modeling tool to answer the questions. IAT 10 Avg. 15 20 PI 10644 74262 ...
@cathoderay 250kWh was chosen because it provides a believable fall in IAT when the heat pump is stopped. I have tried various values and 250kWh see...
Let me try to explain the various problems, and then you can decide whether to explore this matter further. The 'Initial Data' sheet contains the da...
I was merely stating that without some form of recovery boost, the time required for IAT to reach the desired value may be lengthy. A further determin...
I think that you will find that the modeling tool already takes account of the variation of COP with load, also with OAT and LWT, by extrapolating the...
When using the modeling tool it is first necessary to calculate the reference conditions, which in this case was 24 hour running at an OAT of 10C, giv...
@cathoderay There is no 'black box', there are no hidden cells, everything is open to view. If you don't understanding what you are seeing then plea...
@jamespa I think that you will find that degree days don't work well with heat pumps, because the COP varies quite considerably with OAT.
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Degrees of Separation
Latest Posts
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Not a problem; that’s why I left it as it was. The pers...
By Majordennisbloodnok , 10 hours ago
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 19 hours ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 2 days ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
D'oh - of course. I shouldn't post before my brain is f...
By Old_Scientist , 2 days ago
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RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 2 days ago
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RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 2 days ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 2 days ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 3 days ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 3 days ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 3 days ago
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RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 4 days ago
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 5 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 5 days ago
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 6 days ago
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