These are useful observations (same for comment from @Blue). I wonder whether there would be a way to parse these systems into groups. Probably beyond the scope of current HeatPumpMon but might be interesting to energy companies.
That’s exactly what I do - I run it for DHW at night when the tariff is low (but ambient low) and at 1pm when hopefully the ambient is hih and I might also be generatin some solar. I also run it just before any room heating is likely to kick in so that it’s making use of a warm unit.
@TrystanLea Can you tell me if the Profile Explorer App on emoncms uses just the previous year’s data or does it use all available data? (Similar question for this aggregated data too!)
Another useful feature might be to generate the profile for the coldest day, though that might be just particularly useful for me as I’m trying to understand worst-case grid demand profile a the moment!
Rachel
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Hello @Rachel it is just the last 12 months. Can you select the coldest day from the aggregated data?
E.g is it the 18th of January 2024?
https://emoncms.org/heatpumpmonitororg/graph/476418
Is it a bit strange that demand peaked overnight on that day I wonder?
If we could do aggregation on the fly, based on filtered systems that would be interesting… would be good to understand if there are particular systems driving this shape…
Yes that’s a way to find it thanks; is there a way to know the number of heat pumps in the sample at that time? (I assume the normalised demand is the total devided by the number of active systems?)
I think the reason night-time looks exagerated is the non-zero y-axis. It doesn’t look that disimilar to the normalised monthly average if you reset the axis. This is one of the artefacts I’m interested in - it feels to me that given the way we operate heat pumps, with a set-back overnight, but often more continuous daytime load, we may move, as a country, to morning peaking during winters rathert than the normal evening peaking!
Yes @Rachel, you should be able to get to that from the feed view>
Emoncms - feed view
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We had a bit of fun at the recent HeatGeek Hackathon trying to look at some of the topics we have also explored here in terms of grid implications. I thought I would share some of the data and graphs produced looking at one small element of this; the relationship between the aggregated COP of groups of heat pumps and outside temperature.
COP of top 20, top 50 and all systems January 2024 - Note 15-19th Jan cold snap
zooming in on the cold snap, low of -4C on the morning of January 18th 2024:
John Ewbank put together this nice graph to visualise COP vs outside temperature for these different groups of heat pumps.
Or visualised separately:
Top 20 systems
Top 50 systems
All systems
Producing the above turned into a good opportunity to improve the HeatpumpMonitor.org API (Il do a separate post on that) and also to improve the aggregation scripts. The data is all available here https://emoncms.org/heatpumpmonitororg/feed/view, zoom over to January 2024 to see the data (includes aggregated electric input, heat output, outside temperature and COP).
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That’s all really interesting stuff; especially noting that the spread drops as the temperature falls. Also would be interesting to compare the electricity input at time of system peak demand for those systems operating flexibily and those targetting long and low and max CoP.
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