Jackson4
Member
- Location
- Wensleydale
Designing a heating system for my house and have a few questions someone might be able to help with
Am probably DIYing it and am pretty sure i'm having a 500ltr vented heatbank with external flate plate heat exchanger for DHW. Was planning to have dirty water in tank heated by back boiler on the fire in winter and 30/40 vac tubes on south facing shed roof, and put either 4 or 5kw of PV on an east facing roof which could be used as an immersion input for the tank also.
1)Can i run the 'dirty' water from heat bank through the solar thermal? It would seem a simple solution and more efficient way of transferring energy than a heatbank with a solar coil, and cheaper.. so can you not just add anti freeze to the dirty water? Will sediment accumulate in the solar tubes? Aren't some solar tubes either just metal fins or sealed units with antifreeze in and are more suited to this idea?
2) My PV idea is integrated and isnt a big difference from buying indian stone to replace the current york stone slates, when you take the overlap and wastage into account on a 20/25/30m2 extension on the back of the house. I want to just fill the space but will there be any extra costs from fitting a bigger than 4kw system.. i wont be bothering with the FiT. Do i have to contact my dno? Being east facing its only likely to produce 3.5 - 4kw anyway.
3) Lastly i have changed my mind were i would like to fit the 500 ltr tank and now want it on my first floor (70kg tank weighs) and have already got beefed up 9 x 4 by 4.5 metre joists in (Architect spect 8x3x4.5) one end on the wall the other 2 x 2bar reinforced concrete lintels at the other.. if i filled in with 4 9 x 4's will that take the weight of the tank or should i put a 8 x 4 rsj under? Will ask my architect to ask a structural engineer but he's always busy, just wanted an idea.
Many thanks.
Am probably DIYing it and am pretty sure i'm having a 500ltr vented heatbank with external flate plate heat exchanger for DHW. Was planning to have dirty water in tank heated by back boiler on the fire in winter and 30/40 vac tubes on south facing shed roof, and put either 4 or 5kw of PV on an east facing roof which could be used as an immersion input for the tank also.
1)Can i run the 'dirty' water from heat bank through the solar thermal? It would seem a simple solution and more efficient way of transferring energy than a heatbank with a solar coil, and cheaper.. so can you not just add anti freeze to the dirty water? Will sediment accumulate in the solar tubes? Aren't some solar tubes either just metal fins or sealed units with antifreeze in and are more suited to this idea?
2) My PV idea is integrated and isnt a big difference from buying indian stone to replace the current york stone slates, when you take the overlap and wastage into account on a 20/25/30m2 extension on the back of the house. I want to just fill the space but will there be any extra costs from fitting a bigger than 4kw system.. i wont be bothering with the FiT. Do i have to contact my dno? Being east facing its only likely to produce 3.5 - 4kw anyway.
3) Lastly i have changed my mind were i would like to fit the 500 ltr tank and now want it on my first floor (70kg tank weighs) and have already got beefed up 9 x 4 by 4.5 metre joists in (Architect spect 8x3x4.5) one end on the wall the other 2 x 2bar reinforced concrete lintels at the other.. if i filled in with 4 9 x 4's will that take the weight of the tank or should i put a 8 x 4 rsj under? Will ask my architect to ask a structural engineer but he's always busy, just wanted an idea.
Many thanks.