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Article #140Re: Computers use 7W when SWITCHED OFF!
From: Richard
Date: Thu, 19 Mar 2009 09:31
Date: Thu, 19 Mar 2009 09:31
21 lines
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2959 bytes
Tony Houghton wrote: > That's not what heat from a ceiling light achieves. Unless the air > around it gets blown downwards it has to heat it to above 20C for it to > fight the temperature gradient and raise the temperature at ground > level. > > I think the point you're trying to make is that because the lightbulb is > heating the air around it, heat from below isn't lost into that space. > That's true, but the point I'm making is that the area around the > lightbulb gets hotter than the desired 20C and in real world conditions > (no absolutely perfect insulation, people coming in and out of doors > etc) that surplus energy can escape from the room faster. > Actually the heat in the lamp would probably make a chimney effect, dragging cold air into the room thru whatever openings were left, making it overall colder then if the lamp was not there in a hole in the cieling. The difference between that and the radient heat from it shining down could make it one way or the other, and it would be very lamp and room specific so there is little point looking into it IMO.
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