Analytical Model for the Refrigeration Power of the Orifice Pulse Tube Refrigerator (Classic Reprint) PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Analytical Model for the Refrigeration Power of the Orifice Pulse Tube Refrigerator (Classic Reprint) PDF full book. Access full book title Analytical Model for the Refrigeration Power of the Orifice Pulse Tube Refrigerator (Classic Reprint) by Peter J. Storch. Download full books in PDF and EPUB format.
Author: Peter J. Storch Publisher: Forgotten Books ISBN: 9781391652511 Category : Science Languages : en Pages : 106
Book Description
Excerpt from Analytical Model for the Refrigeration Power of the Orifice Pulse Tube Refrigerator The general goal of this study is to gain a better understanding of the refrigeration mechanism and the capability of the ptr. More Specifically, this work is concerned with developing an analytical model for the refrigeration power generated in an orifice pulse tube refrigerator (cftr). With the aid of several simplifying assumptions, we derive equations which identify the important parameters in the system. Once the analytical expressions are devised, verification of the model is accomplished by comparing results to previous experimental studies as well as to experiments completed in this work. A simple, analytical model of the cooling power is useful for three reasons. First, such a model provides insight into the refrigeration mechanism. Often when a numerical model is used to rigorously describe a system, it is difficult to see the physics involved in the process. With an analytical expression, important parameters that affect performance are more easily recognized. Second, basic trends or dependencies of performance can be determined. Such dependencies will aid in optimization and indicate the range of parameters which should be studied in more detail either numerically or experimentally. Third, a simple analytical model will be useful for design. Although not as accurate as a numerical analysis, the model will be convenient for making approximate predictions of system size and refrigeration capacity of the ptr. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Peter J. Storch Publisher: Forgotten Books ISBN: 9781391652511 Category : Science Languages : en Pages : 106
Book Description
Excerpt from Analytical Model for the Refrigeration Power of the Orifice Pulse Tube Refrigerator The general goal of this study is to gain a better understanding of the refrigeration mechanism and the capability of the ptr. More Specifically, this work is concerned with developing an analytical model for the refrigeration power generated in an orifice pulse tube refrigerator (cftr). With the aid of several simplifying assumptions, we derive equations which identify the important parameters in the system. Once the analytical expressions are devised, verification of the model is accomplished by comparing results to previous experimental studies as well as to experiments completed in this work. A simple, analytical model of the cooling power is useful for three reasons. First, such a model provides insight into the refrigeration mechanism. Often when a numerical model is used to rigorously describe a system, it is difficult to see the physics involved in the process. With an analytical expression, important parameters that affect performance are more easily recognized. Second, basic trends or dependencies of performance can be determined. Such dependencies will aid in optimization and indicate the range of parameters which should be studied in more detail either numerically or experimentally. Third, a simple analytical model will be useful for design. Although not as accurate as a numerical analysis, the model will be convenient for making approximate predictions of system size and refrigeration capacity of the ptr. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Steffen Herrmann Publisher: Forgotten Books ISBN: 9780364984765 Category : Technology & Engineering Languages : en Pages : 60
Book Description
Excerpt from Measurements of the Efficiency and Refrigeration Power of Pulse-Tube Refrigerators The principle of operation, as given by Gifford and coworkers [1-5] and by Lechner and Ackermann is qualitatively simple. The basic pulse tube, shown in Figure 1, is closed at the top end, where a good heat - transfer surface must exist between the working gas (helium is best) and the surroundings, in order to dissipate heat. The bottom, Open, end also has a good heat transfer surface to absorb heat from its surroundings. The open end is connected to a pressure - wave generator (in our case a compressor) via a regenerator. During the compression part of the cycle any element of gas in the pulse tube moves toward the closed end and at the same time experiences a temperature rise due to adiabatic compression. At that time the pressure is at its highest value. During the maximum in the pressure wave the gas is cooled somewhat by heat transfer to the tube walls. In the expansion part of the cycle the same element of gas moves toward the open end of the pulse tube and experiences cooling due to adiabatic expansion. During the pressure minimum the gas is warmed by heat transfer from the tube walls. The net result of cycling the pressure in this manner is a shuttle heat transfer process in which each element of gas transfers heat toward the closed end of the pulse tube. The heat pumping mechanism described here requires that the thermal contact between the gas and tube be imperfect, so that the compression and expansion processes are somewhere between isothermal and adiabatic. The best intermediate heat transfer generally occurs when the product of pulse frequency and thermal relaxation time between the gas and the tube walls is approximately unity. The early work on this type of refrigerator was done using a valved compressor and a rotary valve to switch the pulse tube alternately between the high and low pressure sides of the compressor; the pressure wave was approximately a square wave. Such a technique lowers the overall efficiency since no work is recovered in the expansion process. However the actual refrigeration process is relatively efficient because of the short times for compression and expansion, and the long times for heat transfer at the pressure plateaus. The lowest temperature of 124 K was achieved in 1967 by Longsworth [a] with a pulse tube 19 mm in diameter by 318 mm long. The high and low pressures were mpa and mpa, respectively, for a pressure ratio of at a pulse frequency of Hz. At the low temperature limit of 124 K, a gross heat pumping rate of 5 w was obtained which was totally consumed by loss terms such as conduction and regenerator ineffectiveness. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Alisha Robin Schor Publisher: ISBN: Category : Languages : en Pages : 41
Book Description
A first order model for the behavior of a linear orifice pulse tube refrigerator (OPTR) was developed as a design tool for construction of actual OPTRs. The model predicts cooling power as well as the pressure/volume relationships for various segments of the refrigerator with minimal computational requirements. The first portion of this document describes the development of this model and its simplifications relative to higher-order numerical models. The second portion of this document details a physical implementation of the pulse tube and compares its performance to the predicted performance of the model. It was found that the model accurately predicted qualitative behavior and trends of the orifice pulse tube refrigerator, but that the predicted temperature difference was approximately five times higher than the measured temperature difference. It is believed that the model can be improved with provisions for flow choking as well as warnings for behavior outside of the accepted operating conditions.
Author: Nimesh Parmar Publisher: LAP Lambert Academic Publishing ISBN: 9783659243660 Category : Science Languages : en Pages : 0
Book Description
This work is usefull for the the branch of physics and Engineering that involves the study of producing temperatures in the range from practically zero to, say, 125 K and of material behavior at these temperatures. A cryocooler is a refrigeration machine that reaches temperatures below, say, 125 K with a small refrigeration capacity. The objectives of the present work describe the analysis, design and an experimental working model of two stage pulse tube refrigerator. By using the Experiment set-up, cooling Behavior of the refrigeration system and refrigeration power has been investigated. Test a Two stage pulse tube refrigerator in the cryogenics lab of Mechanical Engineering Department of L.D.College of engineering, Ahmedabad. This book can use for initiation design and experiment with pulse tube refrigerator.
Author: Gregory W. Swift Publisher: Springer ISBN: 3319669338 Category : Science Languages : en Pages : 340
Book Description
This updated new edition provides an introduction to the field of thermoacoustics. All of the key aspects of the topic are introduced, with the goal of helping the reader to acquire both an intuitive understanding and the ability to design hardware, build it, and assess its performance. Weaving together intuition, mathematics, and experimental results, this text equips readers with the tools to bridge the fields of thermodynamics and acoustics. At the same time, it remains firmly grounded in experimental results, basing its discussions on the distillation of a body of experiments spanning several decades and countries. The book begins with detailed treatment of the fundamental physical laws that underlie thermoacoustics. It then goes on to discuss key concepts, including simple oscillations, waves, power, and efficiency. The remaining portions of the book delve into more advanced topics and address practical concerns in applications chapters on hardware and measurements. With its careful progression and end-of-chapter exercises, this book will appeal to graduate students in physics and engineering as well as researchers and practitioners in either acoustics or thermodynamics looking to explore the possibilities of thermoacoustics. This revised and expanded second edition has been updated with an eye to modern technology, including computer animations and DeltaEC examples.
Author: Peter J. Storch
Author: Peter J. Storch
Author: Peter J. Storch
Author: Peter J. Storch
Author: Peter J. Storch
Author: Peter James Storch
Author: Steffen Herrmann
Author: Jinglei Shi
Author: Alisha Robin Schor
Author: Nimesh Parmar
Author: Gregory W. Swift