Bøger af Nishant Kumar Singh

Dieses Buch bietet eine gründliche Untersuchung von Dampfabsorptionskältesystemen (VARS) und behandelt in sechs Kapiteln mehrere wichtige Elemente. Der Leser wird in die verschiedenen Arten von Absorbern eingeführt, die in VARS (Variable Amplitude Refrigeration Systems) verwendet werden. Das Kapitel bietet auch eine detaillierte Erläuterung der thermodynamischen und thermophysikalischen Eigenschaften verschiedener Kombinationen von Kältemitteln und Absorbern. Das Buch bietet eine umfassende Literaturübersicht, die die Auswirkungen der Betriebstemperaturen, die Effizienz der Komponenten und die Studien zum Wärme- und Stofftransport von Absorbern untersucht. Die vergleichende Analyse von VARS (Vapour Absorption Refrigeration Systems) auf der Basis von HFKW (Fluorkohlenwasserstoff) und H-FCKW (teilhalogenierter Fluorchlorkohlenwasserstoff) hat ergeben, dass die Kombination R134a-DMAC und der Fallfilm-Absorptionsmodus sehr vielversprechend für Absorber sind.

Jeta kniga predstawlqet soboj podrobnoe issledowanie paroabsorbcionnyh holodil'nyh sistem (VARS), ohwatywaüschee mnozhestwo wazhnejshih älementow w shesti glawah. Chitateli znakomqtsq s razlichnymi tipami absorberow, ispol'zuemyh w sistemah ohlazhdeniq s peremennoj amplitudoj (VARS). V glawe takzhe daetsq podrobnoe ob#qsnenie termodinamicheskih i teplofizicheskih swojstw razlichnyh kombinacij hladagentow i absorbentow. V knige predstawlen obshirnyj obzor literatury, w kotorom rassmatriwaetsq wliqnie rabochih temperatur, äffektiwnost' komponentow, a takzhe issledowaniq teplo- i massoobmena absorberow. Srawnitel'nyj analiz VARS (Vapour Absorption Refrigeration Systems) na osnowe HFC (Hydrofluorocarbon) i HCFC (Hydrochlorofluorocarbon) pokazal, chto kombinaciq R134a-DMAC i rezhim absorbcii padaüschej plenki qwlqütsq wysokoperspektiwnymi dlq absorbentow.

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.

Ce livre propose une étude approfondie des systèmes de réfrigération à absorption de vapeur (VARS), couvrant de nombreux éléments cruciaux à travers six chapitres. Les lecteurs découvrent les différents types d'absorbeurs utilisés dans les systèmes de réfrigération à amplitude variable (VARS). Le chapitre fournit également une explication détaillée des propriétés thermodynamiques et thermophysiques des différentes combinaisons de réfrigérants et d'absorbants. Le livre fournit une analyse documentaire complète qui examine l'impact des températures de fonctionnement, l'efficacité des composants et les études sur le transfert de chaleur et de masse des absorbeurs. L'analyse comparative des systèmes de réfrigération à absorption de vapeur basés sur les HFC (hydrofluorocarbures) et les HCFC (hydrochlorofluorocarbures) a révélé que la combinaison R134a-DMAC et le mode d'absorption à film tombant sont très prometteurs pour les absorbeurs.

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.