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Photovoltaic solar for heating a room? | 13 comments (13 topical, editorial)
Re: Photovoltaic solar for heating a room? (3.00 / 0) (#10)
by Chagrin on Sun Sep 28th, 2008 at 01:14:00 PM MST
(User Info)

So if I built two insulated boxes and put a 100W ceramic heater in one box and a 100W light bulb in the other box, are you saying that the box with the heater in it would get hotter?

[ Parent ]


Re: Photovoltaic solar for heating a room? (3.00 / 0) (#11)
by DamonHD (d@hd.org) on Sun Sep 28th, 2008 at 01:56:17 PM MST
(User Info) http://www.earth.org.uk/

Hi,

No, all other things (eg box dimensions and construction) being equal.

But heat is a VERY low grade form of energy, eg 1kWh of heat can typically only make maybe a third of 1kWh of electricity or light and conversely 1kWh of electricity can make and pump considerably more than 1kWh of heat.

So the '100%' efficiency is a bit misleading.

Like I could burn books for heat fairly efficiency for example, maybe 100% in one of those boxes of yours, but that's missing most of their value.

Rgds

Damon

[ Parent ]



Photovoltaic solar for heating a room? | 13 comments (13 topical, 0 editorial)

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