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Heatgeek
@heatgeek
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Joined: Dec 16, 2024
Last seen: May 29, 2025
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Topics: 1 / Replies: 116
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Reply
RE: Performance of Heat Pumps in Mild Weather

@robs Regarding the November operation as attached, the DT is increased to 8C to get 9kW at the flow of 16 l/min with both compressors. Mitsubishi o...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@robs Thank you. Interesting! I presume that the switch from 20 l/min to 15 l/min was made automatically by the heat pump, and not manually, to effec...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@robs Thank you for this. I attach a graph from the change you made. It is very interesting that you have reduced the flow to broaden the DT as this ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

@trebor12345 I will give you a quick simple explanation using the same diagram in non-defrost mode. Heat pumps work by extracting energy from the ai...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

@trebor12345 @jamespa I do not know your timing sequences but I will try and venture an opinion here. I think that the unit is doing a two phase defr...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@agentgeorge I also have UFH with 4kW HP unit. I agree with your sentiments. UFH is the only way to go. Radiators just complicate things and it is w...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

Theoretically there should be no penalty if there is no power surge on initiation. However, both Samsung and Daikin appear to have a designed-in perio...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@jamespa Talking about Mitsubishi, the @RobS post early on in this thread re 8kW R290 Mitsubishi is interesting as this unit is achieving constant 2k...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@old_scientist Apologies for the late reply. My 500,000 mile check-up was due with the quack. There are three DT’s to consider. Room-to-outside, emi...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

I need to temper my previous statement. This Daikin is running a very high room temperature of 23C which means the flow temperature is too high for a ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa These COP curves might explain something else that was puzzling me. Although the Daikin is running continuously at 1.6kW, its COP is not as g...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance of Heat Pumps in Mild Weather

@jamespa @robs @trebor 12345 Attached is a more detailed power table. CAP and IPT are nominal integrated capacity and input power with defrost corre...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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