For instance, if you do work with duct systems, you undoubtedly know and understand the important fundamental principles behind air flow in duct systems, like the relationship between flow and duct cross section and the relationship between flow and pressure drop. And you probably have a pretty good feel for how these things
interact as duct aspect ratios and shapes change. But few of us could cite from memory the various fitting loss coefficients for the nearly infinite variety of duct fittings out there. Rather, recognizing the need to know, we acquaint ourselves with the
fundamentals cited previously and then consult any one of a number
of recourses like the ASHRAE duct fitting data base the AMCA
Handbooks or the United McGill Duct Design Handbook as we work out the details
of a design.
Obviously, to be able to usefully apply fundamental principles in engineering and scientific endeavors, one has to be able to deal with the mathematics behind them. But, at least for me, to be able to do that successfully, you have to understand in your head and in your gut, what the mathematics are really saying. And that, in my experience, is the hard part.
Principles Of Refrigeration Roy J Dossat Pdf Download
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What I really appreciate about the way the material is presented in Principles of Refrigeration is that Mr. Dossat is able to provide a very readable and understandable explanation of what the equations and fundamentals behind refrigeration systems mean in practical terms that make sense in the real world. The critical equations and math are also presented, but they are supplemented with a very down to earth explanation, which can be priceless.
If you are an operator or field person who never took a thermo course but find yourself dealing with machinery based on its principles every day, the book may turn out to be a gold mine by acquainting you with the fundamental theory behind the phenomenon you work with in a very accessible manner.
This text provides a detailed, applications-oriented treatment of the mechanical refrigeration cycle, associated equipment, component design, and system operation. 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.
Principles of Refrigerationtag_hash_108 provides comprehensive coverage of refrigeration theory, components, and systems analysis and design. 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 student/technician apart when it comes to understanding and troubleshooting system malfunctions, inefficiencies, and service requirements.
After a stint in the U.S. Air Force, Dossat worked as a salesman in Houston at Dad's Root Beer Company until the firm relocated its operations. Dossat then found a job working for two brothers who repaired refrigerators out of their garage. After about a year, he felt he needed more training, so he used his military benefits to attend a refrigeration and air-conditioning course at the University of Houston to learn the trade properly.
As the name suggests, the refrigeration process is a cycle.
We start at the compressor, go through the condenser, then through the restriction, then through the evaporator and finally back to the compressor where the cycle starts all over again.
The Compressor is the heart of the refrigeration cycle and comes in a vast array of sizes.
In smaller systems it is usually found inside the outdoor unit, but in large applications of multiple compressors, they are usually found inside a plant room.
The term refrigeration means cooling a space, substance or system to lower and/or maintain its temperature below the ambient one (while the removed heat is rejected at a higher temperature). In other words, refrigeration is artificial (human-made) cooling.
Thanks for your kind comments Clarke, much appreciated.
This is of course the refrigeration cycle in its simplest form. There are a lot of other components, both electrical & mechanical, that are added to a system in the form of control & safety devices, but no matter how complex a system is, these basic 4 components are the heart of the system and will always be there. If you have that understanding in your head, it makes it easier to comprehend, trace systems out & fault find.
I currently taking a course in R & A, this step by step explanation has really helped me to grasp the basics of refrigeration cycle. I will appreciate if you send me a link to download textbooks with practice questions on this subject. Thanks Torr
Thanks for your comment Mike, and you are absolutely correct in pointing out that the suction line, in real installations, is larger than the discharge, expansion & liquid lines.
I think people who know that will already be relatively familiar with the refrigeration cycle, and this article was aimed at people with no prior understanding of how the cycle works, and designed to keep things as simple and understandable as possible.
I have been trying for the past 4 months to build my concept on refrigeration cycle. Unfortunately, I could not find any article that give satisfactory answers to my questions. Luckily, today, I accidentally came across your article and read it almost twice to get it all in my mind. Thank you so much for this kind of article.
Classic presentation of the principles, applications, and design of refrigeration systems and equipment. No special background in thermodynamics, physics, or calculus is required, as the essential concepts are reviewed in the first five chapters.
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