Renewable Heat Incentives

[billi]

Just a question

What do they mean with 20 kw  solar  thermal ?

Is this the panels max output  , so one can install a solar thermal idea that produces upto 20 KW per hour and get 18 pence  

So that should be arround 20 m2 then

There must be a limit of m2  one can install as well , or ?

Thanks Billi

[zeus]

Just a question

What do they mean with 20 kw  solar  thermal ?

Is this the panels max output  , so one can install a solar thermal idea that produces upto 20 KW per hour and get 18 pence  

So that should be arround 20 m2 then

There must be a limit of m2  one can install as well , or ?

Thanks Billi

Hi

I suppose that this would mean that all panels would need to be tested and certified to have a given output in standard lighting conditions, and therefore a solar conversion efficiency. I'd guess that a 20kW (peak) thermal system would cover something more like 30m2 - 40m2 in order to collect 20kWp thermal at a decent useable temperature in mid summer ..... as per the limit, I've just looked at permitted development and can't see anything on limits, but you'd still need a mighty big space if you have already got pv too !! .... If there is to be a limit, it would probably be best to set it at a level where the installation would provide 'useful' energy as it's not as easy to export what isn't consumed, so I'd be very surprised if a 40m2 system would generate a RHI payment anywhere near a theoretical £3k pa.

[Justme]

I thought the RHI was all about the system needs / load & not about how much it actually produces?

[billi]

.... So it is not so clear yet 

And no need  to develop ideas right now , of how to heat a house with  solar thermal all year round  , or a combi idea with a heatpump


Still ,  just thinking of it, is better than counting sheep , when you cannot sleep 

it sounds an interesting concept to me  and hope they get the "small print" right  , like "only heatpumps with a COP over 3.5 will be entitled "

Billi

[Ivan]

EN BS12975 / Solar Keymark already quote a 'power' for the solar collector at various irradiation levels. I suspect that 1000W/m2 will be chosen, as it's used for PV ratings, and also it's almost the highest output you'll see from a collector in the UK.

According to my calculations, and the new Solar Keymark figures for the Navitron panels (without reflectors), you'd see just under £5k per year with a 20kW system (assuming that the power rating was taken at zero temperature difference) - so not to be sniffed at.

[billi]

.... then the inter-seasonal store and  a heat-pump  would be a dream ...... and a bit PV in the garden  sure 

will be interesting  to read about regulations /caps  for that scheme

Billi

[zeus]

EN BS12975 / Solar Keymark already quote a 'power' for the solar collector at various irradiation levels. I suspect that 1000W/m2 will be chosen, as it's used for PV ratings, and also it's almost the highest output you'll see from a collector in the UK.

According to my calculations, and the new Solar Keymark figures for the Navitron panels (without reflectors), you'd see just under £5k per year with a 20kW system (assuming that the power rating was taken at zero temperature difference) - so not to be sniffed at.

How much South facing roof area would be needed for the 20kW system ??