For both students and professionals, this book presents the science behind the operation of refrigeration systems as a method for building solid analytical skills, which will set the studenttechnician apart when it comes to understanding and troubleshooting system malfunctions, inefficiencies, and service requirements. An overview of the fundamental principles of physics and thermodynamicsincludes an introduction to psychometrics. This is essential to be successful in the hvac industry. Classic presentation of the principles, applications, and design of refrigeration systems and equipment. Materials as printouts and additionally also as pdf files. When 1 pound of ice melts, it absorbs 144 btu, as latent energy. This course is an overview of vaporcompression refrigeration cycle, principles of heat generation, transfer and rejection. Each course includes interactive activities, knowledge checks, and an exam. It is usually done by an artificial means of lowering the temperature, such as by the use of ice or mechanical refrigeration, which is a mechanical system or apparatus, designed and. Refrigeration working principle pdf plant but who wish to extend their knowledge on the basic principles of. Refrigeration the process of cooling or maintaining temperature in a space or object by removing heat pressure a force per unit area applied directly to a surface temperature the measurement of the intensity of heat energy in an object sensible heat heat energy that causes a change in temperature. As mentioned in lesson 1, refrigeration deals with cooling of bodies or fluids to.
Provides students with material that is essential to an understanding of mechanical refrigeration. The illustration above is a consumers understanding of refrigeration. Mechanical refrigeration works by changing the the majority of heat is removed from the the majority of the works by removedchanging the absorbed heat is state of the refrigerant. The suction line connects the evaporator or cooling coil to.
This bulletin covers the basics of ammonia as a refrigerant. However, they may expect you to have a much greater indepth. Jul 19, 2001 principles of refrigeration provides comprehensive coverage of refrigeration theory, components, and systems analysis and design. This chapter gives an overview of the principles of low temperature refrigeration and the thermodynamics behind it. Explain the basics of heat theory and the basic principles of refrigeration. It teaches students how processes can be broken down into fundamental principles so that they can develop analytical skills, correctly analyze and troubleshoot systems, and embark upon successful careers as technicians. Hart 1407 refrigeration principles hart 1407 is the students introduction to the refrigeration cycle of air conditioning and refrigeration systems. Manual for refrigeration servicing introduction technicians. Sep 28, 2015 principle of refrigeration the refrigeration cycle is also known as vapour compression cycle. Refrigeration fundamentals heatcraft worldwide refrigeration.
Your customers may not need to go beyond this simple understanding of refrigeration. Principles of refrigeration principles of refrigeration course description. The cycle operates at two pressures high and low, to produces a continuous cooling effect. Continuous refrigeration can be accomplished by several different processes. Basic principles most of us have some ideas concerning the purpose of refrigeration and what refrigeration does. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Dossat principles of refrigeration john wiley 1961 acrobat 7 pdf 35. Pdf dossatprinciples of refrigeration paola ramirez. Refrigeration is the process of removing heat from an area or a substance and is usually done by an artificial means of lowering the temperature, such as the use of ice or mechanical refrigeration. The system has a cool side and a warm side, and by pumping a fluid through the cool side it collects heat, and then pumps it to the warm side, where it expands, and gives up.
It is intended to cover only the fundamentals of refrigeration theory and practice. A comprehensive applicationsoriented treatment of the mechanical refrigeration cycle and associated equipment. Refrigeration and air conditioning training course principles of refrigeration 32 hours, 32 nate cehs, 3. The principles presented in this text follow the information provided in these. Principles of refrigeration 5th edition by dossat, roy j. Principles of refrigeration provides comprehensive coverage of refrigeration theory, components, and systems analysis and design. Refrigeration and air conditioning training course principles. It is an ebook for people who are involved in training and. Jun 30, 2005 refrigeration principles and systems book. For both students and professionals, this book presents the science behind the operation of refrigeration systems as a method for building solid analytical skills, which will set the studenttechnician apart when it comes to understanding and troubleshooting system. The course package can be subscribed to individually or as a part of the fundamentals elibrary. The standard of comparison for refrigeration cycles is the reversed carnot.
The ideal basic refrigeration cycle consists of four components, connected by piping with refrigerant flowing through the system. Heat and refrigeration principles learning objective. Principles of refrigeration by dossat and a great selection of related books, art and collectibles available now at. The most common refrigeration system in use today involves the input of work from a compressor and uses the vapor compression cycle. The science behind refrigeration berg chilling systems inc. Mar 22, 2017 a refrigeration system is a heat pump, just like a heater is a heat pump. The vapor compression refrigeration cycle is a common method for transferring heat. In 1758, benjamin franklin and john hadley, professor of chemistry, collaborated on a project investigating the principle of evaporation.
This book provides a detailed, applicationsoriented tre. Heat flows in direction of decreasing temperature, i. It controls the pressure exerted on the refrigerant, that determines the boiling and condensing temperature of the refrigerant. In the past, this was done by collecting ice in the winter and using its specific heat to cool as the ice melted. This course will provide the sales person, technician or engineer with a strong foundation and a thorough understanding of the refrigeration circuit, the heart of the hvac system.
Temperature is an indication of the level of heat energy but not of total amount of heat or amount of material that might be present. For example, if a temperature of 100f is indicated in connection with r. It teaches students how processes can be broken down into fundamental principles so that they can develop analytical skills, correctly analyze and troubleshoot systems, and embark upon successful careers as technicians, technologists, and engineers. Refrigeration principles pdf refrigeration industrytrade e. This manual is designed to fill a need which exists for a concise, elementary text to aid servicemen, salesman, students, and others interested in refrigeration.
Tubing or lines make the system complete so that the refrigerant will not leak out into the atmosphere. This course includes basic thermodynamics, heat transfer, temperaturepressure relationship, safe handling of refrigerants, refrigeration containment, and refrigeration components. Without understanding the basic principles, one is likely to be confused, slow to respond, or even incorrect when identifying unsafe conditions. One ton of refrigeration equals 12,000 btu per hour btuh. When compiling the material for the booklet a deliberate. May 21, 2007 the term tons of refrigeration is also used to refer to the cooling load on a room or building.
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