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JamesPa
JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Oct 4, 2026
Profile Activity
Topics: 27 / Replies: 5447
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Reply
RE: Two heating zones to one zone

Or lock them both open by turning up the stats, then adjust the weather compensation curve and if necessary balance to get the house temperature righ...

4 weeks ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Adventures in heat loss calculations

At this point its probably worth pointing out, for future reference, that degree days are not exactly the same as an offset average OAT. There is a...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

I might argue that this is chicken before egg and that HTC is defined by L/DT not the other way round, but otherwise hopefully your example will help ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Adventures in heat loss calculations

Perhaps best to go back to the basic equation: L (total loss) = HTC x DT = PP + PO   PP is a function of DT, PO,we are assuming, is a cons...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Books For Beginners: The Ultimate Guide to Heat Pumps, Bodge Buster, From Zero To Heat Pump Hero & Britain's Heat Pump Shitshow

Interesting also to see his comment on the heating industry more generally which of course you alude to in the book.

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

Again it depends on what you are calculating from what starting point. For example in this calculation The multiplication correctly calculates...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

Great work. Have you subtracted the fixed contribution from the final figure. Remember the loss is what the house loses to the outside world, the h...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat Pump Books For Beginners: The Ultimate Guide to Heat Pumps, Bodge Buster, From Zero To Heat Pump Hero & Britain's Heat Pump Shitshow

I bought it, read it, enjoyed it. Despite my earlier comments I think it should be compulsory reading for everyone in the industry, and everyone who ...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

Agree with the first paragraph (I said roughly the same above). Average indoor temp probably about 20-21C but I cant be absolutely sure. The data w...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adventures in heat loss calculations

Because the plot is against degrees days not OAT, with an assumed base of 15.5, this is most likely an indication that my house has a base a bit highe...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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