We present an analytical model of a ground collector which uses thermal trap material instead of glazing on its top. The effects of different parameters e.g., the depth of the heat retrieval plane, thickness of the thermal trap material and the use of various materials such as concrete, sand and...

The effects of different parameters--e.g. the thickness of the trap material, the flow rate of the water and the depth of the heat-retrieval plane--on the water temperature have been investigated. A comparison of the present system with a conventional solar sand collector was also made.

This paper discusses the thermal modelling of the technique for cooling buildings by means of open evaporation of water over the roof. A comparative study of cooling by means of (i) a roof pond, (ii) a water spray and (iii) moving water over the roof is presented. The influences of parameters...