Principles of refrigeration 32 hours, 32 nate cehs, 3. 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. Refrigeration and air conditioning training course principles of refrigeration 32 hours, 32 nate cehs, 3. For industrial purposes, chillers can be thought of as a component within a complex mechanical system that is used to remove heat from a process or substance. Heat flow is a basic principle of refrigeration in fact, of all hvac work. The contents of this book are intended to interest those who are not engaged every day with refrigeration plant but who wish to extend their knowledge on the basic principles of appliances they see every day. It raises the pressure, temperature and enthalpy of the refrigerant by compressing the saturated gas, in an isentropic process, to a superheated. You could know the entire thing by knowing the pressure and temperature of the evaporator, condenser, and compressor. However, first lets understand air conditioning theory, the basic principle, types of heat, how heat transfers and i will show you how the basic refrigeration cycle. Part 1 this section explains in basic terms the principles that are used to create the refrigeration effect.
Refrigeration basic principle refrigeration evaporators. Refrigeration cycle refrigeration is the transfer of heat from a lower temperature region to a higher temperature region refrigeration cycle is the vaporcompression refrigeration cycle, where the refrigerant is vaporized and condenses alternately and is compressed in the vapor phase. 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. Industrial refrigeration best practices guide 1 chapter 1. Reprints no comments if you are like most of us in the hvac industry, you are a handson person you dont want to mess with a lot of theory, but just get in and get the job done. One ton of refrigeration equals 12,000 btu per hour btuh. For example, in the refrigeration cycle, the evaporator cooling coil is. You can describe something as cold and everyone will know what you mean. The refrigeration system requires some means of connecting the basic major components evaporator, compressor, condenser, and metering device just as roads connect communities.
The refrigeration training course series is intended for users who want to improve or acquire knowledge and skills in refrigeration basics and the refrigeration cycle. In this component, the refrigerant starts as a cold, twophase substance part liquid, part. Continuous refrigeration can be accomplished by several different processes. This warming and cooling of the air is usually referred to as winter and summer air conditioning. However, they may expect you to have a much greater indepth. It is intended to cover only the fundamentals of refrigeration theory and practice. Graphics and animations are used in an attempt to make it easy. There are 4 main components in a mechanical refrigeration system. Compressor basic refrigeration cycle evaporator condenser receiver expansion device.
It will test your understanding of basic theory and the. The highest levels of efficiency in these systems are achieved through a. Before we dive in, lets get an understanding of four key concepts. Identify the various gas laws and their importance to your basic knowledge of physics. 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. Pdf thermodynamics and design principles of refrigeration. As refrigerant in the latent state or as vapor refrigerant in the process of changed state to liquid, this is the phase where it absorbs or rejects large quantities of heat.
Tubing or lines make the system complete so that the refrigerant will not leak out into the atmosphere. Table of contents section 1 basic refrigeration principles types of refrigerant 2 5 refrigerants 28 thermodynamics 11 refrigerant 12 28 heat 11. To really understand what a chiller is, a fundamental knowledge of the principles of basic refrigeration is required. The refrigeration cycle is a critical component of hvac systems and is governed by the principles of thermodynamics. Pdf part 1 fundamentals of refrigeration refrigeration manual. 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.
Basic refrigeration cycle explained hvac 101 step by step duration. This section highlights some of the basic principles of air conditioning for those who would benefit from additional knowledge in this area. Apr 26, 20 basic refrigeration principles johnnyhvac. Graphics and animations are used in an attempt to make it easy to understand the concepts involved. The process where a gas or liquid change its temperature when it is forced through an expansion valve or capillary tube in an insulated system where no ambient heat transfer. The refrigeration cycle tells us if there is air in the central air conditioner units, what to repair after troubleshooting the refrigeration system, if there is enough air conditioner freon, or if the ac filter is dirty. However, the material covered and the method of presentation are such that the text is also suitable for adult evening classes and for onthejob training and selfinstruction.
It is an ebook for people who are involved in training and. May 21, 2007 the term tons of refrigeration is also used to refer to the cooling load on a room or building. Is the process of removing the undesirable heat from a given body to maintain it at a desired lower temperature. This manual will help guide you through your quest to improve your knowledge of commercial. Office of education division of visual aids principles of refrigeration ava12779vnb1 the principles of refrigeration explained. Learn refrigeration principles with free interactive flashcards. The compressor does work on the refrigeration system consumes energy. When 1 pound of ice melts, it absorbs 144 btu, as latent energy. Learning how to read the charts and to do the calculations involved will pay rich dividendsin all phases of refrigeration work.
Is the science and practice of controlling the indoor climate in term of temperature, air motion, humidity, air purity and noise. Basic refrigeration begins with an introduction to the basics of refrigeration and hvac, and then quickly progresses into specific equipment components. Designed to provide a basic, straightforward overview of the concepts and principles of hvac and refrigeration, this book is ideal for readers with a limited amount of experience in the field. Sep 10, 2016 the refrigeration cycle is a critical component of hvac systems and is governed by the principles of thermodynamics. Refrigeration calculations pressureenthalpy charts are tools to use in better understanding refrigeration cycles, for judging whether the operation is normal, and for estimating the effect of change in operation. Since refrigeration deals entirely with the removal or transfer of heat, some knowledge of the nature and effects of heat is necessary for a clear understanding of the subject. You will learn how theoretical refrigeration principles and laws knowledge are applied within the refrigeration industry.
The suction line connects the evaporator or cooling coil to. The less heat an object has, the colder we say it is. When compiling the material for the booklet a deliberate. This section explains in basic terms the principles that are used to create the refrigeration effect. The illustration above is a consumers understanding of refrigeration. The compressor is a vapor compression pump which uses pistons or some other method to compress the refrigerant gas and send it on its way to the condenser. 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.
The danfoss product range for the refrigeration and air. 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. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Explain the basics of heat theory and the basic principles of refrigeration. Sep 28, 2015 principle of refrigeration the refrigeration cycle is also known as vapour compression cycle. Refrigeration principles, practices, and performance langley, chris on.
This chapter gives an overview of the principles of low temperature refrigeration and the thermodynamics behind it. Fundamentals of refrigeration evaporation the picture on fig. One ton of refrigeration is the amount of latent heat absorbed when one ton of ice at 32f melts to water at 32f during 24 hours. Basic principles most of us have some ideas concerning the purpose of refrigeration and what refrigeration does. In the past, this was done by collecting ice in the winter and using its specific heat to cool as the ice melted. Refrigeration basic principle named after two scientists, james prescott joule and william thompson. Welcome to the manual for refrigeration servicing technicians. Course contents evaporative coolers, often called swamp coolers, are cooling systems that use only water and a blower to circulate air. Refrigeration working principle pdf plant but who wish to extend their knowledge on the basic principles of. This book provides a detailed, applicationsoriented tre. When warm, dry unsaturated air is pulled through a watersoaked pad, water is evaporated and is absorbed as water vapor into the air.
Principles of refrigeration provides comprehensive coverage of refrigeration theory, components, and systems analysis and design. This course is an overview of vaporcompression refrigeration cycle, principles of heat generation, transfer and rejection. This text provides a detailed, applicationsoriented treatment of the mechanical refrigeration cycle, associated equipment, component design, and system operation. Basic cryogenic processes joulethomoson process, brayton process as well as claude process are described and compared. For example, if a temperature of 100f is indicated in connection with r. Heat and refrigeration principles learning objective. This book has been written especially for use in programs where a full curriculum in refrigeration is offered. The science behind refrigeration berg chilling systems inc. Use specific gravity to determine the density of a material. Refrigeration fundamentals heatcraft worldwide refrigeration. This procedure is called a throttling process or joulethomson. A chiller is simply a device that used to remove heat from something. Principle of refrigeration the refrigeration cycle is also known as vapour compression cycle.
First of all, did you know that there is no such thing as cold. 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 units are designed to help the student to expand and apply the basic knowledge already mastered and to learn new principles and techniques and to prepare himher for entrylevel work as an apprentice. Refrigeration principles, practices, and performance.
Principles of refrigeration principles of refrigeration course description. This is often measured at the liquids boiling point. 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. The seventeen units cover aid conditioning calculations psychrometrics, residential heat. Your customers may not need to go beyond this simple understanding of refrigeration. 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. Choose from 47 different sets of refrigeration principles flashcards on quizlet. Refrigeration principles pdf refrigeration industrytrade e.
This is essential to be successful in the hvac industry. Identify the basic components of a refrigeration cycle. Heat is added to the liquid which in this case is water causing its temperature to rise. The cycle operates at two pressures high and low, to produces a continuous cooling effect. Any components beyond these basic 4 are called accessories. For example, in the refrigeration cycle, the evaporator cooling coil is colder than the air flowing around it, so heat flows from the warmer air into the evaporator. Dossat principles of refrigeration john wiley 1961 acrobat 7 pdf 35. Back to basics whether youre new to refrigeration or just want to brush up on your basics, the following information may be useful. The compressioncompression refrigeration cycle is the principle upon which conven.
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