In this paper, the effect of placing a reflecting sheet in an air gap on the thermal performance of single hollow, double hollow and insulated hollow walls and roofs is studied. One face of the wall or roof is exposed to solar radiation and ambient air and the other is in contact with room air...

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 describes an analysis of the reduction of the heat flux coming into a room through a roof with an open water pond. A periodic analysis of the system, based on the linearisation of Dunkle's6 expressions for convective, radiative and evaporative losses, is presented. Numerical...

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...

This paper presents rigorous experimental outdoor performance of a 2.32 kWP stand-alone photovoltaic (SAPV) system in New Delhi (India) for four weather types in each month such as clear, hazy, partially cloudy/foggy and fully cloudy/foggy weather conditions respectively. The daily power...

In this paper the thermal model given by Ghoshal and Tiwari has been validated by round-the-year experimental work at IIT Delhi, New Delhi (28° 35′N, 77° 12′E), India. The correlation coefficient and root-mean-square percentage deviation have been computed for each month for validation of...

In this paper an attempt has been made to develop a simple methodology to calculate embodied energy of the adobe house at Solar Energy Park, Indian Institute of Technology Delhi, New Delhi (28°35′N, 77°12′E) and its effect on the environment. The special feature of the adobe house is that,...

In this communication, an attempt has been made to evaluate the cloudiness/haziness factor for the composite climate of New Delhi (latitude: 28.58° N; longitude: 77.02° E; elevation: 216 m above msl). To estimate the hourly variation of beam and diffuse radiation on a horizontal surface for any...

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...