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 describes an investigation of the periodic heat transfer and optimum placement of the air gap in a hollow concrete slab subjected to solar radiation and atmospheric air on one side and in contact with air at a fixed temperature on the other. The heat conduction equation has been...

In this paper, artificial neural network (ANN) models are developed for estimating monthly mean hourly and daily diffuse solar radiation. Solar radiation data from 10 Indian stations, having different climatic conditions, all over India have been used for training and testing the ANN model. The...

The conventional expression for the coefficient of performance (COP) of an ideal absorption cycle is misleading and a correct expression is derived. The deviation in the COP values from these two expressions increases with the increase in the difference in the absorber and condenser temperatures.

This paper proposes a novel latent heat storage which is applicable to solar space heating systems. The device is similar to an absorption refrigerator and stores liquid refrigerant which is subsequently evaporated to release the latent heat. It will recover the energy in a heat pump mode for...

This paper presents a simple mathematical model for solar space heating in a non-airconditioned building with movable insulation over the roof pond. The building room considered is of rectangular shape (6 m x 5 m x 4 m) based on the ground. The effects of heat conduction to the ground, heat...

The energy security performance of Thailand has been assessed using the “Aggregated Energy Security Performance Indicator (AESPI)” for the period 1986–2030. During 1986–1991, AESPI had a sharply decreasing trend from level 9 to level 7 (maximum is 10), implying that the country’s...

An “Aggregated Energy Security Performance Indicator (AESPI)” has been developed by considering 25 individual indicators representing social, economy and environmental dimensions. The principle used, data required and the methodology for the development of AESPI have been detailed. AESPI...

Predictions, as made in Leach et al. (A low-energy strategy for the United Kingdom. Science Reviews Ltd., Austria: International Institute for Environment and Development, 1979.) have been compared with actual values for subsequent years. Their disparities are discussed, together with the...