ASHP results
ASHP results
I know we like Mick in these parts. He’s written a blog post about how his ASHP got on last winter:
https://energy-stats.uk/first-winter-wi ... heat-pump/
https://energy-stats.uk/first-winter-wi ... heat-pump/
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
6x 2.4kWh Pylontech batteries (14.4kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
3x 380W JA Solar panels (1.14kWp)
6x 2.4kWh Pylontech batteries (14.4kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Re: ASHP results
I really respect how much information Mick provides in their articles, especially when it's backed up with very useful data.
Good to see their external installation of the hot water tank has worked well too.
I'm in the middle of a refurb in one of the bedrooms here (soon to become a nursery) and I'm doing a fair bit of work to reduce heat loss, ahead of a likely heat pump next year.
Good to see their external installation of the hot water tank has worked well too.
I'm in the middle of a refurb in one of the bedrooms here (soon to become a nursery) and I'm doing a fair bit of work to reduce heat loss, ahead of a likely heat pump next year.
10x 405W JA Solar panels (4.05kWp) @ 5 degrees
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
3x 405W Longi panels (1.22kWp) @ 90 degrees
16.5kWh DIY LifePo4 battery
Solis inverter/charger
0.6kW Ripple WT
64kWh Kia E-Niro
Re: ASHP results
Surprised his cop is so low
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Re: ASHP results
I’m surprised the COP is so high. Does this include energy used to thaw the heat exchangers? Many installations include a resistive heater in the system, for very cold weather assistance, which may not be recorded/included for COP calculations
Calculations on COP are all very well, but while gas is less than a quarter of electrical energy (on standard current normal capped prices, these installations are little better than a good gas boiler system, from an economic POV. The main advantage is that, as renewables and nuclear (not at Hinkley point strike prices) reduce the amount of fossils burned, the CO2 emissions are reduced - good from a climate change POV.
I’m not yet sold on ASHP tecnology.
Calculations on COP are all very well, but while gas is less than a quarter of electrical energy (on standard current normal capped prices, these installations are little better than a good gas boiler system, from an economic POV. The main advantage is that, as renewables and nuclear (not at Hinkley point strike prices) reduce the amount of fossils burned, the CO2 emissions are reduced - good from a climate change POV.
I’m not yet sold on ASHP tecnology.
Re: ASHP results
His heat pump runs in reverse to provide defrost cycles.Oliver90owner wrote: ↑Thu Jul 27, 2023 7:06 am I’m surprised the COP is so high. Does this include energy used to thaw the heat exchangers? Many installations include a resistive heater in the system, for very cold weather assistance, which may not be recorded/included for COP calculations
Calculations on COP are all very well, but while gas is less than a quarter of electrical energy (on standard current normal capped prices, these installations are little better than a good gas boiler system, from an economic POV. The main advantage is that, as renewables and nuclear (not at Hinkley point strike prices) reduce the amount of fossils burned, the CO2 emissions are reduced - good from a climate change POV.
I’m not yet sold on ASHP tecnology.
Living the dream in Austria.
Uk property 3.75kW PV linked to 3kW inverter.
Uk property 3.75kW PV linked to 3kW inverter.
Re: ASHP results
I would say that was a slightly high COP when compared to others we hear about, but remember it was a mild winter and therefore also low gas use.
Re: ASHP results
Let's not forget he doesn't optimise for CoP! Using TRVs to have different rooms at different temperatures and running the HP harder in the cheap period might be beneficial overall but it lowers headline CoP.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
6x 2.4kWh Pylontech batteries (14.4kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
3x 380W JA Solar panels (1.14kWp)
6x 2.4kWh Pylontech batteries (14.4kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Re: ASHP results
Almost every heat pump in a heating system on the planet is sized for efficiency and not for 100% heat load at the coldest point of the year.Oliver90owner wrote: ↑Thu Jul 27, 2023 7:06 am I’m surprised the COP is so high. Does this include energy used to thaw the heat exchangers? Many installations include a resistive heater in the system, for very cold weather assistance, which may not be recorded/included for COP calculations
Calculations on COP are all very well, but while gas is less than a quarter of electrical energy (on standard current normal capped prices, these installations are little better than a good gas boiler system, from an economic POV. The main advantage is that, as renewables and nuclear (not at Hinkley point strike prices) reduce the amount of fossils burned, the CO2 emissions are reduced - good from a climate change POV.
I’m not yet sold on ASHP tecnology.
We do the latter in the UK and it's bizzare and silly.
Everywhere else they size the heat pump for use most of the year and then when it gets real cold roll out a secondary heat source.
In general terms this would mean size the pump for 6C rather (heating season average) than -3C in the UK.
You will be sold on heat pumps once the penny clicks that they allow you even when running them on electric from gas to move more heat than the energy in the gas itself contains.
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Re: ASHP results
running them on electric from gas? you have CHP?
Maybe cheaper... if you have pv or a TOU tarriff and batteries. My electricity costs over 4 times per kW compared to what gas costs
2.0 kW/4.62 MWh pa in Ripples, 4.5 kWp W-facing pv, 9.5 kWh batt
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
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Re: ASHP results
AE-NMidlands wrote: ↑Thu Jul 27, 2023 6:42 pm"running them on electric from gas?" you have CHP?
Maybe cheaper... if you have pv or a TOU tarriff and batteries. My electricity costs over 4 times per kW compared to what gas costs
2.0 kW/4.62 MWh pa in Ripples, 4.5 kWp W-facing pv, 9.5 kWh batt
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!