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ASHP in Hampshire

batalto · 2021-04-22T13:28:11Z

Hi all, Just wanted to talk you through our upcoming ASHP installation. We live on the south coast, just outside of Portsmouth. The house is a detached home of around 260m2 in footprint. The bottom floor was an extended bungalow and we added a second floor. The first floor is standard construction, brick cavity that's filled and double glazed. The upper floor is made of Structurally Insulated Panels (SIPs) with triple glazing. We had to use SIPs because they are lightweight and so wouldn't affect the shallow bungalow foundations. As an upside SIPS are also extremely efficient in retaining heat and have a very low U value, 0.18. The loft has 200mm of insulation in the middle beneath the floor and 400mm of insulation for everywhere else. We have 8.4kW of solar PV on the roof and 7kWh of battery storage (Pylontech batteries). We also have a Solic solar PV heat controller, which will dump excess solar power into the tank before we export. We've just had our EPC done and we scored very highly A (93) that also provided a heat demand of 34w/m2 which tallies with our ASHP assessment of 36w/m2. The ASHP is a 12kw Midea with a stated SCOP of 3.36 supplied and installed by J A Rees, sourced from Freedom Heat Pumps - total cost just under £10k. We will be replacing our current 32kW gas system boiler and hot water cylinder and using the green homes grant for £5k of the cost and I will paying the other £5k. We qualify for the highest RHI so would expect to get roughly £7200 back over the next 7 years. The boiler will be retained as a backup heating system and isolated from the ASHP system. We have been told this is fine with the RHI as its a backup and not hybrid. The heating is currently set to 45 degrees and we have had no problems. Our main living area has a large bifold door system and west facing. This means we have significant heat loss in the winter and for 2 months its very cold and this makes the room chilly, but not cold. All the other months the solar gain is significant, heating the room and the rest of the house. With the conventional boiler the room is chilly, so I am expecting issues in January heating up the room. We might need to come up with a plan for this room, possibly some thick curtains. The install will be next week and should be very straightforward. The ASHP will go on the drive next to the current power intake. The pipework will go straight through the wall into the current boiler room and tap into the current pipework. The tank will need replacement for one with a larger coil, but more or less everything else will remain the same. The aim is 2 days. Currently our gas is 2.5p and electricity is 14p and the current boiler is 58% efficient (according to the boiler) - this leads to a bill of around £1250 for both gas and electricity for the year. With the ASHP, boiler efficiency and assuming a worse SCOP of 2.7 on the current tariff we expect the bill to fall to just under £1,000 (34,000kw of gas to 7,000kw of electricity). This cost includes a standing charge for gas even though we wont be using it. My plan after we have got used to the ASHP is to upgrade the batteries and add 7kw extra, then move to a new tariff. Agile GO is very interesting as I could fill my batteries at night and expend them during the day. The batteries would store 11.4kw (14kW @ 80% Depth of Discharge). I have estimated this would further drop my bills down to £780

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Air Source Heat Pumps (ASHPs)

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batalto

(@batalto)

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Joined: 5 years ago

Posts: 1092

Topic starter 08/07/2021 3:19 pm

A few pictures of where we are at the moment - Need to tidy up those battery wires and ethernets (they are way too long)

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

👍

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JulianC

(@julianc)

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Joined: 5 years ago

Posts: 336

09/07/2021 6:35 am

Very tidy Midea installation

Daikin Altherma 3H HT 12kWh ASHP with Mixergy h/w cylinder; 4kW solar PV with Solic 200 electric diverter; Honda e and Volvo EX30 Ultra Twin Performance electric vehicles with Myenergi Zappi mk1 & Ohme chargers

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Mars

(@editor)

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12/07/2021 10:26 am

@batalto, looking good.

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batalto

(@batalto)

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Topic starter 14/07/2021 9:40 am

New tank is in the loft - it fits!

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Mars

(@editor)

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14/07/2021 9:49 am

@batalto, excellent. Do you have any photos?

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batalto

(@batalto)

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Topic starter 23/07/2021 2:18 pm

Guys came back today to finish off the lagging and tidy up a few areas. Changed out the expansion tank from 18l to 25l. Not really a lot else to see except the services cupboard with all the meters and what not

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batalto

(@batalto)

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Topic starter 23/07/2021 2:51 pm

Boiler cupboard (boiler doesn't work anymore!) - quite messy with old and new pipework. Anything unlagged is old (I assume?!)

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JulianC

(@julianc)

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23/07/2021 7:27 pm

Looks good. Why did you keep the boiler?

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batalto

(@batalto)

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Topic starter 23/07/2021 9:24 pm

Just left it for the time being. I'll probably get rid next year after we've had the winter. It's all disconnected and just a lump on the wall for the moment

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batalto

(@batalto)

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Topic starter 24/07/2021 4:10 pm

Solic now replaced - all working and diverting now. A bit of extra free energy for the tank

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batalto

(@batalto)

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Topic starter 28/07/2021 10:57 am

Next step - RHI application has been placed. Awaiting the process

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Morgan

(@morgan)

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28/07/2021 1:51 pm

Still awaiting contact by JL Phillips to arrange to carry out the full technical survey having accepted their quote.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.

2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.

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