The constant flow ground collector/storage system consists of a network of pipes buried in the ground; the top surface is black ened and covered with a thermal trap. For a 0·05 m thickness of thermal trap and for a 0·14 m depth of the plane of heat retrieval, the collection efficiency of...

In order to account for the day-to-day variation in the solair temperature data, the coefficients in its Fourier series representation have been assumed to be time dependent. The variation in the numerical values of the coefficient being random, they have been modelled as a stochastic process....

This paper examines the effect of the absorption coefficient of a transparent slab, which forms the outer layer of a roof/wall, on such factors as average thermal flux passing/through/a roof/wall, maximum and minimum values of this thermal flux and the thermal load levelling. It is seen that a...

The performance of a thermal trap flat-plate solar energy collector has been investigated theoretically and validated experimentally, from the point of view of stagnation temperature. The theoretical model is based on the periodic solution of the heat conduction equation and takes into account...

An analysis of a solar energy collector consisting of a network of pipes buried in a mass of sand, the top surface of which is fixed, blackened and glazed, is presented. A theoretical model has been developed to take into account the effect of covering the system with insulation during...

In this paper, we present the theory of a non-porous air heater in which the air is blown both below and above the absorbing surface. Explicit expressions for the outlet air temperature and useful heat flux have been obtained in terms of mass flow rate of the air, distance along the direction of...

The thermal flux coming into an air-conditioned space through a [`]Roof Radiation Trap System' has been evaluated. Numerical calculations have been performed corresponding to the meteorological data on 11 January at Boulder, Colorado (USA), a harsh North American winter day. Subsequent...

This paper describes an analysis of the periodic heat transfer through thermal storage walls and roof pond systems subjected to periodic solar radiation and atmospheric air on one side and in contact with room air at constant temperature (corresponding to air-conditioned rooms) on the other. A...

A simple transient analysis of a built-in storage solar water heater is presented; the results obtained by the present theory are in close agreement with experimental observations as well as with predictions obtained by a more rigorous theory. The water heater consits of an insulated rectangular...