This paper presents a transient behaviour model for a single-glazed hot box type solar cooker which enables the temperatures of various elements of the cooker to be predicted. The experimental results conform well with the theoretically predicted values. In an attempt to establish a simple...

Natural convection losses between an absorber plate and the cover glazing for different gap sizes and at different plate temperatures have been predicted theoretically by various empirical correlations developed by McAdams,4 Mikheyev,3 Tabor,5 Buchberg et al.6 and Hollands et al.7 The free...

Indoor test methods for solar collectors are widely accepted and recommended by ASHRAE. The development of a solar simulator for indoor testing and the certification procedure for photo-thermal solar devices is discussed in this paper. The system consists of 14 quartz halogen lamps and provides...

The results of a comparative study of the steady-state approach and the periodic analysis as applied to the air heater are presented. For the periodic analysis, the meteorological data are represented by a Fourier series. The periodic analysis is carried out by taking half-hourly and hourly...

In this paper an expression for the accurate computation of the overall heat loss coefficient, UL--including front, edge and rear losses--from a solar flat-plate collector has been derived. This expression is used and values of overall heat loss coefficients and overall collector efficiencies...

Analytical expressions for the electrical efficiencies (ηm) of building integrated opaque photovoltaic thermal (BIOPVT) systems based on thin film photovoltaic (PV) modules have been derived. The expressions are valid for different climatic conditions and different design parameters of the...

Analytical expressions have been developed to calculate the temperature dependent electrical efficiency (ηm) and the effect of water flow on the performance of a-Si thin film photovoltaic (PV) modules. The calculated results have been validated by experimental investigations on commercially...

In this communication, an attempt has been made to investigate the performance assessment of a solar photovoltaic (PV) array system based on electrical energy output and power conversion efficiency. Simplified mathematical expressions for evaluating performance indices using experimental...

An analysis is presented for the performance of an inexpensive sand collector for solar energy which has been validated experimentally. The collector consists of a plane network of polythene pipes buried in a sand mass which is kept in a wooden case, the top surface of the sand being fixed by...

This paper presents an analysis for the reduction of the heat flux that occurs by constant flow water in a network of pipes buried in a roof. An air gap is introduced into the roof to achieve maximum thermal load levelling. A periodic solution of the one-dimensional partial differential equation...