What's your monthly SCOP

Spies

Still haven't got over a scop of 4 for heating!

matelodave

For those who are interested on measuring COP/SCOP this may be worth a read
https://energy-stats.uk/how-to-measure-vaillant-arotherm-cop/

Strummer22

A little frustratingly my EcoForest GSHP reports in MWh rather than kWh so numbers aren't very precise. However, it reports the following for April:

0.6 MWh generated
0.1 MWh consumed
5.0 COP.

So probably about 120 kWh consumed. 

I think about 60% would have been for hot water and the rest for the 4 or 5 days of the month that we had the heating on. 

Spies

More mediocrity for May, probably due to short run times on heating as it hasn't really been that cold bar a couple of days here and there, I'll never see a heating SCOP of 4 it seems

Heating

109kWh generated
30kWh electricity used
SCOP 3.63

Water

154kWh heat generated
63kWh electricity used
SCOP 2.44

Strummer22

No heating in May

0.3 MWh heat generated for hot water, COP 4.9.

About 61 kWh electricity used.

NedS

Strummer22 said:

No heating in May

0.3 MWh heat generated for hot water, COP 4.9.

About 61 kWh electricity used.

That's a really good COP for DHW, which by necessity normally involves a lot higher flow temps.

My COP was 3.8 for May, which was boosted by the occasional day of heating when Agile prices were negative (so why not have the heating on all day!). Otherwise, low to mid 3's look more normal for DHW runs this time of year.

Strummer22

NedS said:

Strummer22 said:

No heating in May

0.3 MWh heat generated for hot water, COP 4.9.

About 61 kWh electricity used.

That's a really good COP for DHW, which by necessity normally involves a lot higher flow temps.

My COP was 3.8 for May, which was boosted by the occasional day of heating when Agile prices were negative (so why not have the heating on all day!). Otherwise, low to mid 3's look more normal for DHW runs this time of year.

We generally use all the hot water in the tank before heating again, COP starts really high, then obviously drops as the temperature increases. At the set temp (46°C) when the DHW cycle is finishing the COP is less than 4. 

NedS

Strummer22 said:

NedS said:

Strummer22 said:

No heating in May

0.3 MWh heat generated for hot water, COP 4.9.

About 61 kWh electricity used.

That's a really good COP for DHW, which by necessity normally involves a lot higher flow temps.

My COP was 3.8 for May, which was boosted by the occasional day of heating when Agile prices were negative (so why not have the heating on all day!). Otherwise, low to mid 3's look more normal for DHW runs this time of year.

We generally use all the hot water in the tank before heating again, COP starts really high, then obviously drops as the temperature increases. At the set temp (46°C) when the DHW cycle is finishing the COP is less than 4. 

Yes, it's a lot more efficient to reheat from cold. We do likewise, sometimes the tank temp has dropped as low as 21C (mid tank), and we reheat to 45C. We also try to reheat it just after lunchtime each day, to catch the warmest part of the day.

Strummer22

NedS said:

Strummer22 said:

NedS said:

Strummer22 said:

No heating in May

0.3 MWh heat generated for hot water, COP 4.9.

About 61 kWh electricity used.

That's a really good COP for DHW, which by necessity normally involves a lot higher flow temps.

My COP was 3.8 for May, which was boosted by the occasional day of heating when Agile prices were negative (so why not have the heating on all day!). Otherwise, low to mid 3's look more normal for DHW runs this time of year.

We generally use all the hot water in the tank before heating again, COP starts really high, then obviously drops as the temperature increases. At the set temp (46°C) when the DHW cycle is finishing the COP is less than 4. 

Yes, it's a lot more efficient to reheat from cold. We do likewise, sometimes the tank temp has dropped as low as 21C (mid tank), and we reheat to 45C. We also try to reheat it just after lunchtime each day, to catch the warmest part of the day.

As you should with an ASHP; we have a GSHP so time of day makes next to no difference! I'll have to adjust when we eventually get solar panels which could be a while.

akwexavante

I have a Daikin and every month i divide energy produced by energy used.  The pump is supposed to give a COP between 3 and 4.

October to May, it varies between 3.3 and 3.5. June to September it varies between 2.1 and 2.4.

June to Sept weekly disinfection cycles, having a significant impact on the COP along with short reheating of DHW.  This low COP in essentially the summer months doesn't worry me because i have Solar Panels, and they produce just enough energy on a sunny day to power the ASHP and the immersion heater during its disinfection cycle every week.  The default disinfection cycle start time of 11pm has been changed to 11am to take advantage of the Solar Panels.

I'm hoping to further increase the system's COP when i lift my last ground floor, floor to upsize pipework from 15 to 22mm and insulate well. Pipework under my last floor to lift is not insulated at all at mo.