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Last seen: May 17, 2026
@gary some the trends you've posted show the LWT is at the setpoint. They also show the setpoint is changing and they show the compressor frequency ...
Hello, I confused about why this is a problem for you. Is your house not getting warm enough? Thanks Bob
@gary I'll try and help, but at the moment I'm not really sure what the problem is. <rant> On a more general note, I read threads like this...
The lower the DT the higher the flow rate. The lower the DT on the heating water side, the hotter the average temperature of the heat emitter, so th...
@jamespa I don't know where this comes from. I've heard a variety of numbers mentioned for heating design. 10C, 5C, 7C. I think it comes from ...
Hello @jamespa I've attached a spreadsheet which attempts to show how a heat pump compressor system works. The gas enters the compressor as a s...
OK, so I'm just thinking out loud here: You loose energy through the walls, roof, and draughts - anywhere else? The 10% lost energy could be going...
Hello, sorry I've been quiet for a while. In CathodeRays case the plate heat exchanger was acting as restriction in the flow of energy from the heat...
@cathoderay at constant room temperature, energy in = energy out Q = UA.DT tells you how much energy flows through an object, in this case a wall, w...
Slicing and dicing data can sometimes be fun, but it's often frustrating. I often start by asking "what do I think i'm looking for". So..."does se...
@cathoderay what would the plot look like if you used (Inside temp - Outside temp) as the x-axis? If Q = UA.DT the gradient of the trend would be UA...
@transparent, thank you. That makes sense. Much appreciated. Regards Bob
Latest Posts
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How many people are happy with their ASHP and do you believe them?
It's easy for social media to warp perception and I onl...
By Deltona , 1 hour ago
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RE: Loud noises in the night - and one for the toolbox?
I appreciate your help and when I find the cause I'll p...
By Jancold , 3 hours ago
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RE: Grant Aerona R290 (15.5kW) - How is DHW Target Temp calculated?
Just in case someone else has the misfortune to come ac...
By TaffontheTaff , 4 hours ago
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RE: UK warm homes plan - how can it be delivered?
That looks like the direction the policy makers are hea...
By Temperature_Gradient , 4 hours ago
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RE: Estimating true heat loss from twelve months of consumption data
Thanks - something to certainly consider !
By ian33a , 5 hours ago
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RE: Forum updates, announcements & issues
Yes, I got it at 10:24. But Wednesday is my "day off"...
By Transparent , 5 hours ago
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RE: Daikin Altherma 3 with Fan Coils in Puglia (Italy)… Sanity Check on System Operation
@bobflux thanks also for your insight and the +1 ! reg...
By Simon_JM , 9 hours ago
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RE: Heat Pump Operation in Summer - Valliant 7kW
Personal choice but without a doubt my heating pump cop...
By JamesPa , 11 hours ago
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RE: MCS 2.0 - Changes in January 2025
I had a few quotes and none of them says much about the...
By Batpred , 12 hours ago
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We’ve had a mention in the Financial Times. 👀 ...
By Mars , 13 hours ago
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RE: ASHP Capacity loss with aging
I see where you were also going with this, its is likel...
By ASHP-BOBBA , 17 hours ago
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RE: Renewables & Heat Pumps in the News
Interesting prompt about whether some of the solutions ...
By Jeff , 18 hours ago
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RE: Lower electric tariffs for heat pump users
I did some modelling using our real consumption figures...
By ChandyKris , 1 day ago
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RE: Sizing an ASHP; Heat loss and kW
There will be no changes internally; ground floor is al...
By GutoFfowc , 1 day ago
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OK, here's a rather off-the-wall discovery I've made th...
By Majordennisbloodnok , 1 day ago
