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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

CONCRETE SLABS AS SUMMER SOLAR COLLECTORS

Get access (open in a dialog) DOI: 10.1615/IHTC8.360
pages 683-689

Sinopsis

The feasibility of embedding water tubes into concrete slabs to heat water in summer, when the sun shines on the surface, is explored.
The equation simulating conduction in the slab is set up with the appropriate boundary conditions and a general initial condition. Weather and solar data from a standard source are incorporated into the surface boundary condition. Water at different given temperatures is assumed to pass through the tubes when conditions are such that useful heat can be collected.
The daily heat collection quantity per unit area is estimated for different inlet water temperatures for the design day. The heat collection is found to be strongly dependent on the water temperature, ambient 24 hr air temperature and insolation. The results are tabulated and graphed in a general way.
It is shown that the concept of "solar efficiency" is fallacious, because the useful heat cannot be closely correlated to the instantaneous insolation alone (in contrast to non-massive solar collectors).