Posted by: @transparent

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Posted by: @majordennisbloodnok

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Just to clarify, are you doing this to work out how much thermal gain you're getting as a result of the windows?

Thermal gain from Windows is a common issue.

But Home Assistant can also run on a Raspberry Pi, which takes less power of course.  😉 

Badoom, tsh.

@sheriff-fatman New Year Greetings. Here is some of my data from over Christmas and New Year. I have been experimenting with flow rates, flow temperatures and a colder house. I have also looked at the heat produced

Here's the summary. As before a very disappointing COP value from the Mitsubishi Ecodan R290 10kW unit, making it expensive to run. As before I am using the data available from the Mitsubishi system and my Powervault system. The heat produced is in line with my experiences from last year when I had a gas central heating system.

My concern is that I am tinkering with a heat pump that doesn't come close to its manufacturers stated performance, e.g. a COP of 4.2 at 2C for 4.2kW of heat with a flow temperature of 35C. Still glad that I have 2 wood burning stoves.

@ecoste Interesting figures, thank you for sharing.

For context, my heating costs are 55% lower than last year's gas boiler usage, so I'm trying to tweak a system that is doing the job required, but for which the COP data is still 'bugging' me.  It's possible mine is a reporting issue, for example.

Yours isn't providing the cost savings, but has better COP figures than mine in some points of that data, so there's a more fundamental concern to address.  Common sense might suggest that I could step away from looking too deeply at my system and be content with the financial result, but I'm not the type to do sensible things like that .  You don't have that option at present, so I can understand your frustration.

I hope you get the answers/resolution that you're seeking in due course.  If I can provide anything to assist with that, from a data perspective, let me know.

Posted by: @ecoste

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@sheriff-fatman New Year Greetings. Here is some of my data from over Christmas and New Year. I have been experimenting with flow rates, flow temperatures and a colder house. I have also looked at the heat produced

Here's the summary. As before a very disappointing COP value from the Mitsubishi Ecodan R290 10kW unit, making it expensive to run. As before I am using the data available from the Mitsubishi system and my Powervault system. The heat produced is in line with my experiences from last year when I had a gas central heating system.

My concern is that I am tinkering with a heat pump that doesn't come close to its manufacturers stated performance, e.g. a COP of 4.2 at 2C for 4.2kW of heat with a flow temperature of 35C. Still glad that I have 2 wood burning stoves.

Quick query, but what is the Heat Produced column measuring in your data table?  The only thing I can equate those number to is an hourly rate in kWh, but over what period is that being measured?  Also, you have two results for 24th December.  Is one of them a typo or are there two separate measurement periods on that day, and if so how long are the gaps.

I ask, because I've got a daily heat output of over 100kWh on each of the last 3 days (today being one of them) which I can't obviously relate to the numbers shown in your table but if I convert this to an hourly average then it lands in a similar ballpark to those figures.

@sheriff-fatman All data is the average of readings taken at 5 minute intervals over a period of about 2 hours during which the system was stable, e.g. no defrosting took place over the measurement period. I did take 2 sets of readings on 24 Dec, a few hours apart. The heat produced is the averaged instantaneous power, which is kW. So for example if the Jan 5th value of 4.4kW ran all day it would be 24*4.4=105.6kWHr of heat generated from 39.1kWHr of electricity.

@majordennisbloodnok This is some really good stuff. I wasn't aware of these integrations and they look like being a bit more targeted than the Forecast.Solar integration. We're also within a few miles of a METAR station. Being able to include some indication of local horizons is a big improvement on my current implementation. The value is, admittedly, a bit limited as I know that the actual solar gain at this time of year is effectively zero (east-west-north facing only, with buildings on all sides means we don't actually get any direct sun into the windows for most of winter), but it could certainly be useful come summer as we do get a lot of solar gain then.

Including a windchill correction is interesting, too, and I'll definitely be keeping an eye out for a correlation between wind speed/direction and indoor temperature. We're generally fairly sheltered, but when the wind is from specific directions, I think it can have a much larger impact.

@steelbadger, I’ve pretty much decided now that there’s an integration for everything and it’s just a matter of finding it. I tok started with solar radiance for estimating solar gain but didn’t find it directional enough. Now I’m in danger of installing interesting stuff and trying to find a use for it later; the tail wagging the dog never ends well….