End of year report, Project impossible.
Graham Hendra
Heat Pump Subject Matter Expert, Refrigeration and Air conditioning lecturer
happy new year everyone.
Its the last day of 2023 so ive been reading the meters at my sons house, home of project impossible. Where we connected a heat pump to an old heating system with no modifications at all to rads pipework etc. Just a new tank (sun amp) and a heat pump.
The figures are in.
We started with an old gen 5, R32 Samsung heat pump, it was a low temperature unit. In its short life 1/4/23 to 12/7/23, 102 days, it produced 1300 kWhrs of heat and used 425 kWhrs of electricity. That's a COP of 2.8.
It was not a great success, it could only produce water at 50C so we didn't get very good results, i.e. not enough hot water in the Sunamp.
On the 12/7/23 it was replaced by a new gen 6 HIGH TEMPERATURE (60C) heat pump, we reprogrammed it to run at 60C in hot water (easy if you know how) and weather comp in heating, immediately the hot water shortages went away.
The new unit has now been running for 171 days. Its running off the old rads with TRVs, no header, no buffer, 1 pump, using the stat in the Samsung controller to drive it. It runs 24/7 at 18C in the hallway.
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The hallway is cold, it has a vented floor and no carpet, its still being refurbed. The rest of the house which has been refurbed (plastered and painted) is much warmer, 21C.
Despite being a high temperature unit it has never needed to operate at more than 51C flow temperature in heating. Even in the very cold snap lasting a few days at the end of November.
In its 171 days of life its produced 3640 kWhrs of heat, its consumed 1151 kWhrs of electricity which is a cop of 3.2. but this is all academic heat pump geek bullshit.
The interesting bit is the energy cost. From January 2023 to July 2023 my son paid a direct debit of ￡248 a month for gas and electricity.
He now pays ￡171 a month for electricity, the gas has been ripped out. Oh and he's got an electric car too, which he charges at night.
So there we have it, the house is hotter all the time, its cheaper to run, all the time, we didn't have to destroy the house to do the installation. Heat pumps are easy, cheap and hot.
Some one get the telegraph on the phone.
happy new year.
Strategy with a Difference
10 个月Interesting case study! The myths about #heatpumps are gradually dismantling, including, "heat pumps cost a fortune to run", or "heat pumps don't work in cold weather", or "heat pumps only work if you've got top quality insulation".. and so on. Trouble is that the vitriol being directed against heat pumps is nothing to do with the facts and everything to do with prejuduce, ideology, and politics
Brilliant and cuts through all the conjecture
Managing Director
11 个月This is really interesting stuff. What is the age/type of construction of the house? It seems the high temperature pumps have cracked the issues with the older lower temperature units.
This is REALLY interested Graham Hendra. Gives me some hope that a heat pump is deployable at home at some point in the future. Our existing single pipe gas system is fit for the bin, and a new system will need all the floors up, hence not having done it yet, but this is giving my the confidence that it might be the way to go. Is there a next stage of roll out?
Director at Subcooled Air Conditioning Ltd
11 个月What was wrong with the oil boiler?