Experimental and theoretical investigations to optimise the geometrical design parameters of a tubular collector under atmospheric and evacuated (~ 10-3 torr) conditions are reported. The results indicate that a maximum stagnation temperature, which corresponds to the minimum heat loss, is...

Highly stable selective coatings of cobalt oxide have been prepared on commercial aluminium and galvanised iron substrates by the method of spray pyrolysis. The optothermal, structural and optical properties of these films have been investigated to determine the optimum growth parameters. Best...

A low cost, single-step process employing spray pyrolysis has been developed to deposit selective black nickel coatings on commercially available aluminium and galvanised iron substrates. Parameters for growth have been optimised by a comparative study of the structural, opto-thermal and optical...

The objective of this work is to assess the combined effects of fixed pressure drop and specific air mass flow rate on duct dimensions (length and depth) of single-pass-with-bare-plate, single-cover and double-cover solar air heaters, and to obtain the resultant system efficiency that...

A detailed theoretical parametec analysis has been made on corrugated and flat plate solar air heaters of five differentconfigurations. The analysis involves investigating the effects of the air flow velocities (or the air channel depths) on the air temperatureincrement, the system efficiency...

The performance parameters of a hybrid air-to-water solar heater has been presented in this paper for a cold climatic region in India. A conventional solar air heater in conjunction with an air-to-water heat exchanger of finned-shell-and-tube type in which hot air from the collector transfers...

The present investigation deals with a transient parametric analysis of a solar residential heating system which comprises a corrugated absorber water heater and a water-to-air heat exchanger-cum-heat storage unit integrated to a residential building to be heated. The heat exchanger-cum-heat...

This paper deals with efforts to improve the performance of conventional, duct- type air heaters by providing rectangular fins in the air passage between the absorber and the rear plate. For this configuration, a mathematical model is developed by writing the energy balance equations at various...

This article describes the results of a simulation study of a forced-circulation solar hybrid domestic hot water system (SHDHW) that circulates air through a rockbed air heater and employs an external air-to-water, transverse fin, shell-and-tube heat exchanger to transfer heat from the air to...

A transient analysis has been carried out on a hybrid solar water heater which comprises a rock bed air heater with optimum design parameters in conjunction with an air-to-water transverse fin shell-and-tube heat exchanger (mixed air and unmixed water type) in which cold water from the storage...