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Last seen: Sep 14, 2026
Posted by @jamespa It would be interesting at some point to develop a list and estimates for all of them. Below I've considered the impact of t...
Posted by: @jamespa At this point its probably worth pointing out, for future reference, that degree days are not exactly the same as an offset ave...
@jamespa I just worked on the last post as you were also doing so. Good to see that we are on the same page. Your explanation captures exactly what ...
@cathoderay Well I managed to make a mistake with this myself! However, a simple thought experiment convinced me of the correct formulation. Cons...
We have a 6.56kW solar PV system (16x 410W panels) installed in March 2023. It uses a LuxPower 5kW hybrid inverter, which can provide up to 8kW output...
A refinement of the degree-day method The degree day method of heat loss calculation is very useful because it only requires smart meter data on dai...
@cathoderay Most of the time our hot water heating runs every 48 hours rather than every 24, since with relatively low use it takes that long for t...
Posted by: @cathoderay I'm not too worried about the DHW tank losses, the tank is like yours in an airing cupboard, but the airing cupboard is in th...
@cathoderay @jamespa Unfortunately, there was a slip up in my working in some of the earlier posts. When plotting measured power output vs. temp...
@cathoderay I'm pleased to see that your cleaned up data gives consistent results. It's great to see this analysis working in practice. Plotting ...
@judith Thanks for the advice on an air leakage test. It's definitely on the list for the two reasons that you suggest: finding leaks and also havi...
@cathoderay @jamespa I think a positive y-axis intercept is not necessarily an indication that something is wrong when the x-axis values are degree...
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Degrees of Separation
Latest Posts
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RE: Next steps on my ASHP journey: Radiators and Pipework
If you have a flowmeter and two temperature probes, the...
By bobflux , 40 minutes ago
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RE: Who's your electricity provider and what's your tariff?
@old_scientist id not thought about agile export bef...
By Papahuhu , 1 hour ago
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RE: Is it the house or the equipment?
@springswood Gas connection / disconnection is the re...
By Rob of York , 2 hours ago
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RE: Starting Our Heat Pump Journey: 1962 build 3 bed detached house
@ian-s One interesting difference between your two q...
By Rob of York , 6 hours ago
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RE: Siting of the external sensor on a heatpump
@jamespa Absolutely. Even if the same mistake was mad...
By Batpred , 8 hours ago
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RE: Recommendations in Ely (Cambs) area for Full setup checks on Nibe HP setup for House.
In fairness all heating has cost a lot to run in recent...
By JamesPa , 1 day ago
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RE: Navigating the World of Refrigerants In Heat Pumps: A Guide for Homeowners
Indeed we are invvestigating AC at present and are havi...
By Toodles , 2 days ago
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No, but the heat pump must be capable of delivering a S...
By JamesPa , 3 days ago
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RE: Daikin ESPAltherma and Home Assistant installation
It's laziness lol The PV system is very chatty, meter...
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RE: Problems with sizing a replacement for a Viessmann Vitocal 200-S
R (The R Project for Statistical Computing, I use it wi...
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RE: Vaillant Arotherm Plus 7KW need a service on it
booked it with Vaillant. will use them until i can find...
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RE: Adventures in heat loss calculations
I have seen it stated that the declared calorific value...
By JamesPa , 4 days ago
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RE: Two heating zones to one zone
@transparent Many thanks. The garage is fairly well ...
By Profzarkov , 4 days ago
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