Notifications

Clear all

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

Page 21 / 21 Prev

Air Source Heat Pumps (ASHPs)

Last Post by batalto 2 years ago

243 Posts

14 Users

128 Reactions

54.6 K Views

RSS

batalto

(@batalto)

Famed Member Member

Joined: 5 years ago

Posts: 1092

Topic starter 06/01/2023 2:12 pm

@derek-m try midea2020

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

ReplyQuote

Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4427

06/01/2023 3:32 pm

Posted by: @batalto

↑

@derek-m try midea2020

Thanks Batalto, much appreciated.

ReplyQuote

batalto

(@batalto)

Famed Member Member

Joined: 5 years ago

Posts: 1092

Topic starter 21/06/2023 7:40 am

Hope you're all enjoying the lack of heating in this weather. The forum is dead until October and then we'll get the "why is my bill bigger" crowd.

Thought I'd share an update on our power consumption over the year

Screenshot 2023 06 21 08 36 12 67 40deb401b9ffe8e1df2f1cc5ba480b12

This month we have used 1kw... And that was me messing around with CT clamps under load confusing things.

ReplyQuote

Page 21 / 21 Prev

26 Forums
2,323 Topics
52.1 K Posts
399 Online
5,979 Members

Forum Icons: Forum contains no unread posts Forum contains unread posts

Topic Icons: Not Replied Replied Active Hot Sticky Unapproved Solved Private Closed

RE: Flow rate discrepancy between ASHP and manifold

@bornagain I had considered that, but have air release ...

By AshRolls , 55 seconds ago
RE: Replacing my 18 month old Hitachi Yutaki ASHP

Fair enough. I recommend quizzing him to get your mone...

By JamesPa , 52 minutes ago
RE: Solar panels on side of house to heat water

Yes, I have one in my Thermal Store. In the days befo...

By Transparent , 3 hours ago
RE: Havenwise App Help & Forum Support – Get the Most from Your Heat Pump

@simonwig Thanks for the bump. Not sure why I didn't se...

By HCas , 4 hours ago
RE: Are Water Companies Delivering Bricks?!

...which in turn reminds me of a Thelwell cartoon I onc...

By Majordennisbloodnok , 4 hours ago
RE: Our journey through Octopus tariffs 2020-2025

I mentioned above "2025 move to Intelligent Go meant ...

By Tim441 , 4 hours ago
RE: Testing new controls/monitoring for Midea Clone ASHP

@benson — thank you, that is useful information you hav...

By cathodeRay , 7 hours ago
RE: Grant Aerona circulation/system pump staying on

My parameters are: 42 00 = 0 (so the next three value...

By MikeFl , 7 hours ago
RE: Electricity price predictions

My apologies. I should've written "The number and dep...

By Transparent , 8 hours ago
RE: Help…my NIBE heat pump has faulted again!

If it happens only when it gets cold then it maybe that...

By JamesPa , 8 hours ago
RE: Grant Aerona3 - Home Assistant control via Modbus

Has anyone got past this screen to set up the integrati...

By AlanW1212 , 8 hours ago
RE: Heat Pump Training vs. Real-World Installation

@lucia have you discoveredfor how green each of our ene...

By Judith , 9 hours ago
RE: Diagnostic Data Needed for Repeatedly Failing Tesla Powerwall 3 System

You seem to be on the right track... Installers are rec...

By Batpred , 17 hours ago
RE: Should Our Water Circulation Pump Be Configured to Run All The Time?

there's a detect cycle setting (4200) on the old grant ...

By damonc , 19 hours ago
RE: Commencing on an ASHP Installation Process

@sheriff-fatman It's also worth highlighting that th...

By Lucia , 20 hours ago
RE: Hitachi Yutaki SCombi Heat Pump - Owners

. It does but, unless there has been a firmware updat...

By JamesPa , 23 hours ago
RE: Help me keep the faith with my air source heat pump installation

Yesterday it was chilly and the cosy6 had a Cop of 4.3 ...

By AgentGeorge , 1 day ago
RE: Solar Power Output – Let’s Compare Generation Figures

@toodles Same here! This month 187kw.

By Andris , 1 day ago
RE: Confused by Flow Rates

@jamespa Ah, they do indeed do firmware updates very oc...

By Toodles , 1 day ago

Forums

ASHP in Hampshire

Join Us!

Podcast Picks

Latest Posts

Members Online