DamonHD

Internal prep works today including removing the existing cupboard, disconnecting the Sunamp Thermino, and threading round a new T+E from the Eddi heater 2 output for the Thermino in the new control scheme...

Modest external groundworks for the heat pump were completed on Friday morning, so it seems this is really going ahead! I have turned off (low-carbon) grid boost to the Thermino ready for the system to be rearranged...

Here is the proposed integration: https://www.earth.org.uk/Octopus-heat-pump-journey.html#2024-10-31

On Monday I had a pre-installation visit to discuss details of trenching and other prep works, for a planned install next month. We often don't put our heating on until December, so I may have already done my last space heating with gas in this house. Consumption has been tiny since April: https://www.earth.org.uk/saving-electricity-2024.html I am developing a scheme for re-integrating the Sunamp and Intasol with the heat-pump DHW which I think might work well (treating the DHW cylinder as if it is a combi in this arrangement, with the DHW cylinder being 1st priority for Eddi diversion/boost output, Sunamp 2nd),

Are you being paid a FiT? That may be at risk if you change the panels.

"earn" is not the same as "profit"

I am on the point of signing up for the next stage of an Octopus heat-pump install, enough to apply for the BUS grant, but it is a bit of a journey, and nothing is cut-n-dried yet! https://www.earth.org.uk/Octopus-heat-pump-journey.html

Fully insulating our homes and electrifying our heating *will* knock ~15% off the UK's current carbon footprint. On a slightly different note, and much smaller beer but still needs sorting and would be *very* easy to address, I'm trying to get Apple, Amazon, Spotify, etc, to do something about the the 99.9% of resources they are wasting polling RSS/podcast feeds: https://www.earth.org.uk/RSS-efficiency.htm

I am using the numbers from the original Heat Geek page / pump, a Mitsubishi Ecodan.

My model is purposely as simple as I could make it and is steady state, eg no thermal capacity, losses other than conductive, incidental gains, etc...

@sharpener"You could keep turning it down" is a bit of a straw man. 😀 My point here is mainly about tolerance (dynamic and static) of deviations from a selected preferred temperature. Yes, indeed, if you are too hot all the time then move your setpoint down. However, not all users of the same home have the same preferred setpoint or tolerance just to complicate issues, and each of us have our tolerance affected by things such as external weather, time of day, recent activity levels, ... I note that my daughter wants a set point far higher than I do, at a point where I am beginning to feel uncomfortably warm sometimes. And she is dressed sensibly! So our rooms have different set points: hard to acheive without zoning.

I have my research plan / confirmation report open right now, and I am putting "the effect that increased short-cycling on ASHP COP" in it right now... B^>

A key point which only became clear to me from a throw-away remark from one of the peer reviewers: the bad setback effect is forced by having rads only just large enough for the no-setback state. This suggests always at least slightly oversizing rads if you can.

I was just on an Elexon working group considering allowing domestic PV users to net exports and imports in any (settlement) half-hour, which would save the home a little money and would reduce settlement inconsistencies elsewhere in the system. One of my worries was precisely the perverse behaviour that it might encourage around the edges of HH periods, eg everyone 'using up' any excess export in minute 29 at once.

Proposed the last two for our local plan...