Bøger af Nishant Kumar Singh

Este livro fornece uma investigação completa dos Sistemas de Refrigeração por Absorção de Vapor (VARS), abrangendo vários elementos cruciais ao longo de seis capítulos. Os leitores são apresentados aos vários tipos de absorvedores utilizados nos Sistemas de Refrigeração de Amplitude Variável (VARS). O capítulo também fornece uma explicação detalhada das propriedades termodinâmicas e termofísicas de diferentes combinações de refrigerantes e absorventes. O livro fornece uma revisão exaustiva da literatura que examina o impacto das temperaturas de funcionamento, a eficiência dos componentes e os estudos sobre a transferência de calor e massa dos absorventes. A análise comparativa dos VARS (Sistemas de Refrigeração por Absorção de Vapor) baseados em HFC (Hidrofluorocarbono) e HCFC (Hidroclorofluorocarbono) revelou que a combinação R134a-DMAC e o modo de absorção de película descendente são altamente promissores para os absorventes.

This Book provides a thorough investigation of Vapour Absorption Refrigeration Systems (VARS), covering multiple crucial elements throughout six chapters. Readers are introduced to the various types of absorbers used in Variable Amplitude Refrigeration Systems (VARS). The chapter also provides a detailed explanation of the thermodynamic and thermo-physical properties of different combinations of refrigerants and absorbents. The book provides a comprehensive literature review that examines the impact of operating temperatures, the efficiency of components, and the studies on heat and mass transfer of absorbers. The comparative analysis of VARS (Vapour Absorption Refrigeration Systems) based on HFC (Hydrofluorocarbon) and HCFC (Hydrochlorofluorocarbon) revealed that the R134a-DMAC combination and the falling film absorption mode are highly promising for absorbers.

Electro-discharge machining (EDM) is a nonstandard electro-thermal machining technology used to produce geometrically complex or hard material parts that are highly challenging-to-machine by traditional machining methods. By igniting quick and repeating spark discharges between the tool and work piece separated by a narrow gap of around 0.01 to 0.50 mm, the method allows for the controlled erosion of electrically conductive materials. This void is filled with a dielectric fluid, either by flooding or immersion. The goal of this study is to evaluate the optimal process parameters of Argon gas assisted machining on P91 steel super alloy material with copper as a tool electrode and kerosene as a dielectric fluid. Experiments were carried out to determine the link between the current pulse on and off times, as well as the material removal rate and tool wear rate. EDM in gas is recent modification in machining method. In this method, EDM is performed with gas and kerosene-based oil, so that pollution reduces. The greatest advantage of EDM in gas is very low level of electrode wear rate.