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Refrigeration is the process of removing heat from an enclosed space, or from a substance, and moving it to a place where it is unobjectionable. The primary purpose of refrigeration is lowering the temperature of the enclosed space or substance and then maintaining that lower temperature. This book reviews research on refrigeration including an overview of up-to-date developments and technology in the field of magnetic refrigeration at room temperature (RTMR); an alternative approach based on artificial neural networks (ANNs) to determine thermodynamic properties of refrigerants; solar powered sorption refrigeration and air conditioning; the modelling of chilling and freezing processes and others.
This technical study guide teaches you the necessary key concepts and skills for passing the Mechanical HVAC & Refrigeration PE exam. The guide covers all exam topics and includes practice problems with detailed solutions in each section.
This text provides background information, description, and analysis of four major cooling system technologies—vapor compression cooling, evaporative cooling, absorption cooling, and gas cooling. Vapor compression systems are currently the primary technology used in most standard domestic, commercial, and industrial cooling applications, as they have both performance and economic advantages over the other competing cooling systems. However, there are many other applications in which evaporative cooling, absorption cooling, or gas cooling technologies are a preferred choice. The main focus of the text is on the application of the thermal sciences to refrigeration and air conditioning systems. The goals are to familiarize the reader with cooling technology nomenclature, and provide insight into how refrigeration and air conditioning systems can be modeled and analyzed.Cooling systems are inherently complex, as the second law of thermodynamics does not allow thermal energy to be transferred directly from a lower temperature to a higher temperature, so the heat transfer is done indirectly through a thermodynamic cycle. Emphasis is placed on constructing idealized thermodynamic cycles to represent actual physical situations in cooling systems. The text also contains numerous practical examples to show how one can calculate the performance of cooling system components. By becoming familiar with the analyses presented in the examples, one can gain a feel for the the representative values of the various thermal and mechanical parameters that characterize cooling systems.
NEW EDITION AVAILABLE Six-Minute Solutions prepares you to answer even the most difficult morning and afternoon HVAC and refrigeration problems in just minutes. Learning important strategies to solve these problems quickly and efficiently is the key to passing the mechanical PE exam. Six-Minute Solutions will help you pass with: 85 challenging multiple-choice problems, similar in format and difficulty to the actual exam Two levels of difficulty: 20 morning (breadth) problems and 65 afternoon (depth) problems A hint for each problem, to help you get started on the right path Step-by-step solutions outlining how to answer problems quickly and correctly Explanations of the three "distractor" answer choices, so you can see where common errors occur and learn how to avoid them HVAC and Refrigeration Exam Topics Covered * Compressible Flow * Fluid Mechanics * Supportive Knowledges * Energy Balances * Heat Transfer * Systems * Equipment and Components * Psychrometrics * Thermodynamics