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iancalderbank
@iancalderbank
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Noble Member
Joined: Oct 17, 2022
Last seen: Jan 14, 2025
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Topics: 0 / Replies: 643
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Reply
RE: Low Loss Header is losing 1.5c from flow temperature

@sunandair DT is a phrase used too much in HP discussions, one needs to be clear about between what points the difference is being measured. Its nor...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low Loss Header is losing 1.5c from flow temperature

doesn't matter. check the datasheet 2 posts up. the higher the flowT, the worse the COP. same for any heat pump. also you are talking about loss...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low Loss Header is losing 1.5c from flow temperature

@sunandair if your sketch is accurate, and the DT on both sides is the same, and the flow rate on both sides is the same, then heat energy transfer is...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

kwh needed is the only unit that can be calculated or estimated by a system designer. although we've had a lot of debate here about how accurate (or n...

2 years ago
Forum
Introductions, Forum Rules & Updates
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RE: Say hello and introduce yourself

@amanda1 several of us are trying to politely put you on the right track, there is no misogyny here, I think I was quite polite in my previous posts. ...

2 years ago
Forum
Introductions, Forum Rules & Updates
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RE: Say hello and introduce yourself

@amanda1 from what I can see (From a quick read of their manuals), the mitsubishi "freeze stat" configuration is a form of "freeze protection function...

2 years ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Say hello and introduce yourself

@amanda1 in general there are a few concepts to try to separate and think about "defrost" = the heat pump running in reverse. to defrost itself w...

2 years ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Say hello and introduce yourself

here's a use case: I've seen the "freeze protection mode" on my (samsung) kick in during a very cold snap night in april, after a mild day. the heatin...

2 years ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: Solar panels not working correctly? what checks can I make?

@derek-m mine is the same type of system as tim's. here's snapshot of one of my panels just now (its not sunny). current is more or less the sam...

2 years ago
Forum
Solar Photovoltaic (PV)
Reply
RE: Say hello and introduce yourself

@amanda1 in general, the purpose of the anti-freeze protection function of the HP is usually for the "AND" situation: "outside air temperature below ...

2 years ago
Forum
Introductions, Forum Rules & Updates
Reply
RE: ASHP hot water vs solar PV via diverter - tank average temperature

@allyfish mm ok, there must be something else making it cut out because you should be able to go as hot as the immersions limiter, maybe grant have d...

2 years ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: ASHP hot water vs solar PV via diverter - tank average temperature

@allyfish at this time of the year if you have copious PV you can turn the immersion stat up to maximum thereby dump the max amount of free energy int...

2 years ago
Forum
Domestic Hot Water & Cylinders
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