What's your monthly SCOP

NedS

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

matt_drummer

Here's mine

Emoncms - app view

COP for October is 5.42

It was installed in February this year and the SCOP is 4.98 so far.

I expect the first year to finish over 5 now I have it `dialled in'

michaels

NedS said:

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

What sort of cycling are you getting with a big heat pump and mild temps, do you control via water temp or a themostat?

Strummer22

GSHP owner - got 5.8 in October and about 5 averaged over 12 months. 

NedS

michaels said:

NedS said:

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

What sort of cycling are you getting with a big heat pump and mild temps, do you control via water temp or a themostat?

Because we are on Agile rather than a fixed tariff, I am controlling the 'cycling' manually with the room thermostat (effectively turning demand for heat on/off). As it's oversized (and it's mild), it only needs to be on for a couple hours per day, so makes financial sense to ensure those couple hours are during the cheaper slots on Agile. Today we ran for a couple hours this morning when we got up, then off for a couple hours and back on for an hour between 2-3pm. It will be off now until 7:30pm, after the peak evening rates.

We will certainly need to see temps below 10C, maybe even approaching zero before we can run anything like continuously, even on minimum output. But that certainly doesn't seem to be massively impacting efficiency at present as I can still achieve a COP of 6 for short (1h) heating run in mild weather.

When it's colder and we are doing longer runs (but still not continuous), I may programme it to be on / off for 30min periods depending on the Agile pricing. Over the next few months I will find out what ambient temp matches my minimum 32C flow temp, and thus what ambient temp I can just leave it to run.

NedS

matt_drummer said:

Here's mine

Emoncms - app view

COP for October is 5.42

It was installed in February this year and the SCOP is 4.98 so far.

I expect the first year to finish over 5 now I have it `dialled in'

That's amazing Matt - I'd be happy with an annual SCOP of 4, so to get over 5 really is excellent (I know it's been a journey to get there though!)

matt_drummer

NedS said:

michaels said:

NedS said:

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

What sort of cycling are you getting with a big heat pump and mild temps, do you control via water temp or a themostat?

Because we are on Agile rather than a fixed tariff, I am controlling the 'cycling' manually with the room thermostat (effectively turning demand for heat on/off). As it's oversized (and it's mild), it only needs to be on for a couple hours per day, so makes financial sense to ensure those couple hours are during the cheaper slots on Agile. Today we ran for a couple hours this morning when we got up, then off for a couple hours and back on for an hour between 2-3pm. It will be off now until 7:30pm, after the peak evening rates.

We will certainly need to see temps below 10C, maybe even approaching zero before we can run anything like continuously, even on minimum output. But that certainly doesn't seem to be massively impacting efficiency at present as I can still achieve a COP of 6 for short (1h) heating run in mild weather.

When it's colder and we are doing longer runs (but still not continuous), I may programme it to be on / off for 30min periods depending on the Agile pricing. Over the next few months I will find out what ambient temp matches my minimum 32C flow temp, and thus what ambient temp I can just leave it to run.

How are you measuring your efficiency?

NedS

matt_drummer said:

NedS said:

michaels said:

NedS said:

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

What sort of cycling are you getting with a big heat pump and mild temps, do you control via water temp or a themostat?

Because we are on Agile rather than a fixed tariff, I am controlling the 'cycling' manually with the room thermostat (effectively turning demand for heat on/off). As it's oversized (and it's mild), it only needs to be on for a couple hours per day, so makes financial sense to ensure those couple hours are during the cheaper slots on Agile. Today we ran for a couple hours this morning when we got up, then off for a couple hours and back on for an hour between 2-3pm. It will be off now until 7:30pm, after the peak evening rates.

We will certainly need to see temps below 10C, maybe even approaching zero before we can run anything like continuously, even on minimum output. But that certainly doesn't seem to be massively impacting efficiency at present as I can still achieve a COP of 6 for short (1h) heating run in mild weather.

When it's colder and we are doing longer runs (but still not continuous), I may programme it to be on / off for 30min periods depending on the Agile pricing. Over the next few months I will find out what ambient temp matches my minimum 32C flow temp, and thus what ambient temp I can just leave it to run.

How are you measuring your efficiency?

Generation/consumption.

I'm using a dedicated Emlite electrical meter to record electrical consumption for the ASHP and reading generation off the Samsung controller as I have no heat meter installed. The Samsung data seems reasonable. The COP values I'm observing are very much in line with those published by Samsung in their data tables.

matt_drummer

NedS said:

matt_drummer said:

NedS said:

michaels said:

NedS said:

As there are a few of us with ASHPs installed, I thought I'd start a thread to compare monthly SCOPs so we can see how we are performing.

I had my 12kW Samsung ASHP installed in June. It's been heating DHW over the summer and we are just now starting to get a feel for heating. It's an oversized unit, so we won't be able to run continuously until it gets a lot colder, but it's been heating the house nicely with 32C flow temps during October.

My monthly SCOPs:

June-August: 3.75 (DHW only)

September: 4.05 (improved as occasional heating)

October: 4.75 (combined DHW and heating)

With the current mild weather (12-14C), I am getting a COP of 6 for short heating runs at 32C flow temps (the lowest I can run). This will warm the house at a rate of around 1C per hour.

Anyone else want to share theirs?

What sort of cycling are you getting with a big heat pump and mild temps, do you control via water temp or a themostat?

Because we are on Agile rather than a fixed tariff, I am controlling the 'cycling' manually with the room thermostat (effectively turning demand for heat on/off). As it's oversized (and it's mild), it only needs to be on for a couple hours per day, so makes financial sense to ensure those couple hours are during the cheaper slots on Agile. Today we ran for a couple hours this morning when we got up, then off for a couple hours and back on for an hour between 2-3pm. It will be off now until 7:30pm, after the peak evening rates.

We will certainly need to see temps below 10C, maybe even approaching zero before we can run anything like continuously, even on minimum output. But that certainly doesn't seem to be massively impacting efficiency at present as I can still achieve a COP of 6 for short (1h) heating run in mild weather.

When it's colder and we are doing longer runs (but still not continuous), I may programme it to be on / off for 30min periods depending on the Agile pricing. Over the next few months I will find out what ambient temp matches my minimum 32C flow temp, and thus what ambient temp I can just leave it to run.

How are you measuring your efficiency?

Generation/consumption.

I'm using a dedicated Emlite electrical meter to record electrical consumption for the ASHP and reading generation off the Samsung controller as I have no heat meter installed. The Samsung data seems reasonable. The COP values I'm observing are very much in line with those published by Samsung in their data tables.

Yes, I saw in your other recent post after I asked.

So, the Samsung controller tells you the heat generated and then you divide that by the electrical consumption?

It's normal with heat pumps to include the circulation pump(s) in the calculation of COP but as you say, when comparing to gas or oil, it's actually a better comparison by leaving out the circulation pump(s) electricity consumption.

My figures include my circulation pump as do most others on heatpumpmonitor.org

I don't know how accurate the reporting from the Samsung controller is but I am glad that it seems to be working well and you are happy.

NedS

matt_drummer said:

Yes, I saw in your other recent post after I asked.

So, the Samsung controller tells you the heat generated and then you divide that by the electrical consumption?

It's normal with heat pumps to include the circulation pump(s) in the calculation of COP but as you say, when comparing to gas or oil, it's actually a better comparison by leaving out the circulation pump(s) electricity consumption.

My figures include my circulation pump as do most others on heatpumpmonitor.org

I don't know how accurate the reporting from the Samsung controller is but I am glad that it seems to be working well and you are happy.

I can take the electricity used from the Samsung controller too, which includes the pumps, but it also includes the immersion usage so I'd need to try to strip that out to make it meaningful, which makes things more complicated. Also, the Samsung controller records immersion usage for the whole time the system thinks it is on, even if the immersion has cut out on it's own thermostat (I said it gets complicated!)

matt_drummer

NedS said:

matt_drummer said:

Yes, I saw in your other recent post after I asked.

So, the Samsung controller tells you the heat generated and then you divide that by the electrical consumption?

It's normal with heat pumps to include the circulation pump(s) in the calculation of COP but as you say, when comparing to gas or oil, it's actually a better comparison by leaving out the circulation pump(s) electricity consumption.

My figures include my circulation pump as do most others on heatpumpmonitor.org

I don't know how accurate the reporting from the Samsung controller is but I am glad that it seems to be working well and you are happy.

I can take the electricity used from the Samsung controller too, which includes the pumps, but it also includes the immersion usage so I'd need to try to strip that out to make it meaningful, which makes things more complicated. Also, the Samsung controller records immersion usage for the whole time the system thinks it is on, even if the immersion has cut out on it's own thermostat (I said it gets complicated!)

Sounds weird, the Samsung controller records electricity that isn't being used, doesn't sound like a reliable source of information?

Anyway, what I was really asking is where you get the heat produced from and what does it represent?

They all do it differently, Daikin report all heat produced whereas Vaillant report only heat produced in addition to electricity used.

So with a Vaillant COP is (heat reported + electricity)/electricity

With a Daikin COP is heat produced/electricity

Does your Samsung include heat added by the immersion? To assess whether everything is actually working well you need to know exactly what the heat produced reported by your controller actually is.

What is the immersion used for anyway, mine is turned off at the consumer unit.