Showing papers by "Shireesh B. Kedare published in 2009"
TL;DR: In this article, the effect of geometrical parameters on the performance of the rotors in terms of coefficient of static torque, coefficient of torque and coefficient of power was investigated in an open jet wind tunnel.
295 citations
TL;DR: In this paper, a helical Savonius rotor with a twist of 90° was proposed to decrease the variation in static torque from 0° to 360°, and the performance of the helical rotor with and without shaft was compared in an open jet wind tunnel.
258 citations
TL;DR: In this article, an experimental and numerical study of the steady state convective losses occurring from a downward facing cylindrical cavity receiver of length 0.5m, internal diameter of 0.3m and a wind skirt diameter of0.5mm is carried out.
216 citations
TL;DR: In this paper, a methodology for optimum sizing of different components (i.e., rotor diameter, electrical generator rating, and battery capacity) of a standalone wind-battery system is proposed.
71 citations
TL;DR: In this paper, the effect of water replenishment on the system sizing is studied and a novel strategy for water replenishing is proposed to improve the design and performance of solar water heating systems.
47 citations
TL;DR: In this paper, the suitability of modified Savonius wind rotors for water-pumping application is studied with a mathematical model developed for estimating the discharge over a period of time.
Abstract: The suitability of modified Savonius wind rotors for water-pumping application is studied with a mathematical model developed for estimating the discharge over a period of time. Single- and three-stage modified Savonius rotors, which are extensively tested in an open jet wind tunnel, are chosen. The best geometrical configuration for a single-stage rotor has shown a maximum coefficient of power of 19% at a Reynolds number of 120000, which increases with the increase in the Reynolds number. The coefficient of power at a higher Reynolds number experienced in the field trials is estimated by extrapolating the results at a lower Reynolds number. The discharge for these modified Savonius rotors is estimated from the mathematical models developed for roto-dynamic and piston pumps at design wind velocities of 6 and 8.5 m/sec. The estimated discharges for a single-stage rotor of 3 m diameter at design wind velocities of 6 and 8.5 m/sec are 5000 and 6000 m3/month for roto-dynamic pumps. The estimated discharge is ...
11 citations
Journal Article•
TL;DR: In this paper, the authors illustrate the generation of design space for different reliability levels for wind-battery systems using chance constrained programming, which can generate and evaluate a range of possible design alternatives which can speed up the decision making process and also provide a clear understanding of the system design limitations.
Abstract: The technical challenge in designing an onsite power generation system incorporating renewable energy technology for overall sustainability is the inherent unpredictability of the renewable resource. Integration of a battery bank as energy storage can alleviate the mismatch between the load and power generation. By accounting for the system operating and geometrical constraints, the entire set of feasible design options can be identified on a plot of battery capacity vs. rated power of wind generator. Such a diagram is known as the design space. The present study illustrates the generation of design space for different reliability levels for wind-battery systems using chance constrained programming. The proposed approach can generate and evaluate a range of possible design alternatives which can speed up the decision making process and also provide a clear understanding of the system design limitations.
5 citations
Journal Article•
TL;DR: In this article, an experimental thermal analysis of a solar cavity receiver is reported, where the cavity is made up of helically coiled copper tube and the experiments are conducted in a dry test mode wherein the coiled tube of the receiver is heated electrically and no fluid is circulated through the receiver coil.
Abstract: In this communication, an experimental thermal analysis of a solar cavity receiver is reported. The cavity receiver is made up of helically coiled copper tube. The experiments are conducted in a dry test mode wherein the coiled tube of the receiver is heated electrically and no fluid is circulated through the receiver coil. A special heating set-up is designed so as to replicate the actual heating of the tubes by solar insolation. The temperature variations in the cavity receiver are studied at receiver orientations of 45° and 90° (downward facing cavity) for power input values of 0.33, 0.5, 0.667 and 1kW. The results suggest that the air and tube temperatures are higher at 90° inclination when compared to 45° inclination. The temperatures are higher near the back wall of the receiver and are lower at the receiver aperture. The difference in temperatures at the inner most regions of the receiver and at the aperture are low for the 90° receiver inclination when compared to the 45° inclination. This indicates the presence of a large stagnation zone for the 90° receiver inclination when compared with that of 45° inclination.
1 citations