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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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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...

2 months ago
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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...

2 months ago
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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 ...

2 months ago
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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...

2 months ago
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Air Source Heat Pumps (ASHPs)
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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...

2 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...

2 months ago
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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...

2 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...

2 months ago
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Air Source Heat Pumps (ASHPs)
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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...

2 months ago
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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 ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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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...

2 months ago
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Air Source Heat Pumps (ASHPs)
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