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Heating and cooling: Heat recovery

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  1.  
    • CommentAuthorTriassic
    • CommentTimeFeb 2nd 2012 edited
     
    I've been thinking about heat recovery and re-use and having read about the heat associated with solar PV and was wondering how hot the air space below the array gets and if this heat could be recovered and reused?

    Anyone got any seasonal PV heat data?
    •  
      CommentAuthorDamonHD
    • CommentTimeFeb 2nd 2012
     
    The general principle is called PV/T (PV/thermal) as you are probably aware. (Plus some variations.) Searching for that in your favourite search engine should turn up some data.

    It has been suggested (IIRC) that typical top-surface temps are between about 90C (if radiation were the only means of cooling) and ~50C (allowing for convection) in strong sunshine.

    Rgds

    Damon
    • CommentAuthorTriassic
    • CommentTimeFeb 2nd 2012
     
    Thanks for the suggestion, it helped jog my memory.

    What is had in mind was solar air conditioning, where the warm air trapped behind the PV array is ducted into the ASHP and used to heat the thermal store. Found some good examples from the US but has anyone in the UK got any experience of its use?
    •  
      CommentAuthorSteamyTea
    • CommentTimeFeb 6th 2012
     
    Posted By: TriassicFound some good examples from the US but has anyone in the UK got any experience of its use?

    Not got any data, but I think the physics do not stack up because of the SHC of air (1 kJ.kg^-1.K^-1), the low density (~1.2 kg. m^-3), the conductivity of (~0.024 W.m^-1.K^-1) and the ambient temperature (-10~25 C).
    Rather stacks against doing it.

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