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Author Topic: RHI for GSHP how is the payment calculated?  (Read 4842 times)
mpooley
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« on: December 17, 2012, 11:49:33 AM »

Say I work out I need 34000 kw/h of heat input /annum and the RHI is 12.5p per Kw/h

What does that mean? 34000*12.5p ?

Or do they divide that by an assumed cop of say 4 ?

I know they will use a deemed figure but that's no help

thanks

Mike
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brackwell
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« Reply #1 on: December 17, 2012, 12:38:25 PM »

I believe its output of the system -forget cops.  Think of solar thermal with virtually no input -has to be on output.    The question is how are they going to deem that output? the identical house situated in different parts of the country and occupied in different ways will make it a nonsense.  You got to despair at these people who dream this up.

Cannot possibly be 34,000 kwh/annum for heating unless you live in a palace!

Ken
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Ted
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« Reply #2 on: December 17, 2012, 02:02:42 PM »

AFAIK RHI method of deemed heat has not been finally nailed down yet.  Previously proposals from DECC were to deem the heat demand based on the amount of heat your house would use if it was fully insulated. Calculated over a 20 year period and then paid to you over 7 years.
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mpooley
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« Reply #3 on: December 17, 2012, 03:42:38 PM »

I believe its output of the system -forget cops.  Think of solar thermal with virtually no input -has to be on output.    The question is how are they going to deem that output? the identical house situated in different parts of the country and occupied in different ways will make it a nonsense.  You got to despair at these people who dream this up.

Cannot possibly be 34,000 kwh/annum for heating unless you live in a palace!

Ken

Ken My house is not a Palace but it is a largish Barn Conversion. Pretty well insulated too. 400mm loft insulation all cavity walls insulated etc
I have done all the calcs before and checked them against Oil usage so I can assure you I do use 34000kw/h of heat.

approx 3400 ltrs of oil assuming 10kw/h per ltre

that's not that bad actually I know of a guy in a similar house who uses over 6000ltrs / year !

Ted
so if they deem my house to use for arguments sake 34000kwh of heat and they stick to the minimum that they mention in the consultation paper of 12.5p per Kw/hr
would I get 34000 times 12.5p or would they say assume a COP of 4 and divide the 34000 by 4?

thanks

Mike
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Richard Owen
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« Reply #4 on: December 17, 2012, 05:32:51 PM »


34000kw/h


Mike

34,000kWh.

They are kilowatt hours, not kilowatts per hour.
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brackwell
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« Reply #5 on: December 18, 2012, 09:29:39 AM »

34,000 kwh-3400L - 6000L- absolutely gob smacking.   They somehow think this is OK.  Ah, perhaps its a commune/public place with many occupants.

Ken
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mpooley
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« Reply #6 on: August 30, 2013, 12:49:49 PM »

One of the people I have had round to quote me for a heat Pump told me of a couple who have a holiday home on the north Norfolk coast who only use it for a few weekends a year but leave the heat on all the time.
The house is so big they use a whole tanker full every year!

don't know if it's true or not but I hope not.

I suppose if you are a banker you not only don't care who you screw over but are not worried about the waste either.
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It's not easy having a good time. Even smiling makes my face ache.

“Science is the belief in the ignorance of experts.” Richard Feynman
djh
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« Reply #7 on: August 30, 2013, 01:43:42 PM »

One of the people I have had round to quote me for a heat Pump told me of a couple who have a holiday home on the north Norfolk coast who only use it for a few weekends a year but leave the heat on all the time.
The house is so big they use a whole tanker full every year!

They're not called Phil & Liz are they?
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Cheers, Dave
mpooley
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« Reply #8 on: August 30, 2013, 01:46:22 PM »

No they probably use a lot more than that! Undecided
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It's not easy having a good time. Even smiling makes my face ache.

“Science is the belief in the ignorance of experts.” Richard Feynman
Ivan
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« Reply #9 on: August 31, 2013, 01:05:04 AM »

From the latest press release (linked in another post in this category), it appears that the payment will be based on the output (disregard input energy) - as mentioned by Brackwell. It also seems to suggest that the figure will be taken from the Green Deal Report, which will be mandatory (They've got to find a reason for everyone to need these bits of paper!!). Minimum insulation levels will also be mandatory (250mm loft insulation, for example).
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NavBen
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« Reply #10 on: September 12, 2013, 10:57:00 AM »

Heat pumps run on electricity, although they produce more heat than they use elec. Therefore, if you've got a COP of 4 (3:1 heat produced to elec. used), you'd multiply your deemed annual kWh usage by 3/4 (in order to omit the non-renewable electricity which provides a portion of the heat used) and multiply that by the tariff.

In your case, for a GSHP with COP of 4,

34,000 x 12.5p/kWh x 3/4 = £3187.50 pa return from RHI.
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NavBen
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« Reply #11 on: September 12, 2013, 10:59:14 AM »

NB - i haven't checked your numbers so this calculation is for principle illustration only
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mpooley
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« Reply #12 on: September 12, 2013, 11:00:55 AM »

I thought the RHI for ASHP is only around 7p ?
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It's not easy having a good time. Even smiling makes my face ache.

“Science is the belief in the ignorance of experts.” Richard Feynman
NavBen
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« Reply #13 on: September 12, 2013, 11:13:46 AM »

For GSHP commerical is 4.8/3.5p / kWh, and for domestic 18.8p/ kWh.
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A.L.
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« Reply #14 on: September 12, 2013, 11:18:21 AM »

I thought the RHI for ASHP is only around 7p ?

- correct (7.3p), but they are talking Ground Source as your title for the thread suggests! Grin
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