Topic
Thermal efficiency
About: Thermal efficiency is a research topic. Over the lifetime, 20911 publications have been published within this topic receiving 302373 citations. The topic is also known as: thermodynamic efficiency & efficiency.
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TL;DR: In this paper, the authors present an extensive study of the research carried out on double pass solar air heater and conclude that most of the studies carried out by the authors were carried out with porous media and extended surfaces.
Abstract: Improvement of the thermal performance of a solar air heater can be obtained by enhancing the rate of heat transfer. The thermal efficiency of double pass solar air heater is higher in comparison to single pass with the concept involved of doubling the heat transfer area without increase in the system cost. Numbers of studies have been carried out on the performance analysis of double pass solar air heater provided with heat transfer augmentation techniques viz. using extended surfaces, packed bed, corrugated absorber were reported in the literature and found more increase in the thermal efficiency in comparison to conventional double duct solar air heater. These studies includes the design of double pass solar air heater, heat transfer enhancement, flow phenomenon and pressure drop in duct. This paper presents an extensive study of the research carried out on double pass solar air heater. Based on the literature review, it is concluded that most of the studies carried out on double pass solar air heater integrated with porous media and extended surfaces. Few studies were carried out with corrugated absorber. Further no study has been reported so far on double pass solar air heater with absorber plate artificially roughened from both the sides. Mathematical models based on energy analysis of some configurations of solar air heater have been discussed.
96 citations
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01 Apr 1981
TL;DR: In this paper, a heat transfer system for maintaining a thermal balance between a gas turbine engine and heat generating accessory components of the engine is described, where heat is removed from the cooling system 48 of an electrical generator and is transferred to the fuel supply system 32 of an engine.
Abstract: Heat transfer systems for maintaining a thermal balance between a gas turbine engine and heat generating accessory components of the engine are disclosed. In the embodiment illustrated, heat is removed from the cooling system 48 of an electrical generator 46 and is transferred to the fuel supply system 32 of the engine. In one detailed embodiment, the cooling system 48 is in direct heat transfer communication with the downstream portion 62 of the fuel supply system through a heat exchanger 76 and in indirect heat transfer communication with the upstream portion 60 of the fuel supply system through the fuel recirculation system 42.
96 citations
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TL;DR: In this article, the authors investigated methods of recovering the residual low grade thermal energy and converting it into higher quality mechanical energy using the thermodynamic Rankine cycle principle, and found that water is a poor working fluid for the conversion system, thus several potential working fluids, including ammonia, synthetic refrigerants and organic compounds have been considered as alternatives.
96 citations
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TL;DR: In this article, a meso-scale ceramic combustor with internal thermal energy recirculation was designed and fabricated, and thermal imaging of the combustor walls was performed using infrared camera to obtain the temperature distribution.
95 citations
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TL;DR: In this article, a regenerative organic Rankine cycle (RORC) system is designed to recover the exhaust heat of a diesel engine, and the influence of the intermediate pressure (the pressures at which the steam is extracted from the expander) on performance parameters such as net power output, thermal efficiency and mass flow rate of the working fluid are analyzed.
95 citations