Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

Impact of Working Fluids and Performance of Isobutane in the Refrigeration System
Author: Solomon O. Banjo
Publisher:
Total Pages: 0
Release: 2019
Genre: Electronic books
ISBN:

The effect of heat transfer medium (HTM) on the environment is associated with ozone layer depletion and global warming. The role of HTM (working fluid) in the heating and air conditioning industries is paramount, which cannot be underestimated. The conventional refrigerant has been predominantly used over decades due to their thermodynamic properties. However, hydrocarbon refrigerants such as isobutane are considered substitutes because they have negligible global warming potential and zero ozone depletion. That makes it eco-friendly among other existing refrigerants. The investigation of the refrigeration system,Äôs performance characteristics required consideration for the coefficient of performance, refrigerating effect, and the compressor work; this enables the determination of the system,Äôs efficiency without any assumption. Another factor that suggests a better absorption of refrigerant (working fluid) into a refrigeration system is an increase in the coefficient of performance (COP). The effect will cause a reduction in the rate of energy consumption by the compressor. The result shows that the system,Äôs coefficient of performance when using R600a was 27.1% higher than when working with R134a, with an energy reduction of 23.3%.

Nanolubricants

Nanolubricants
Author: Jean Michel Martin
Publisher: John Wiley & Sons
Total Pages: 246
Release: 2008-04-30
Genre: Science
ISBN: 0470987707

The technology involved in lubrication by nanoparticles is a rapidly developing scientific area and one that has been watched with interest for the past ten years. Nanolubrication offers a solution to many problems associated with traditional lubricants that contain sulphur and phosphorus; and though for some time the production of nanoparticles was restricted by the technologies available, today synthesis methods have been improved to such a level that it is possible to produce large quantities relatively cheaply and efficiently. Nanolubricants develops a new concept of lubrication, based on these nanoparticles, and along with the authors’ own research it synthesises the information available on the topic of nanolubrication from existing literature and presents it in a concise form. Describes the many advantages and potential applications of nanotechnology in the tribological field. Offers a full review of the state-of-the-art as well as much original research that is yet unpublished. Includes sections on boundary lubrication by colloïdal systems, nanolubricants made of metal dichalcogenides, carbon-based nanolubricants, overbased detergent salts, nanolubricants made of metals and boron-based solid nanolubricants and lubrication additives. Authored by highly regarded experts in the field with contributions from leading international academics. Nanolubricants will appeal to postgraduate students, academics and researchers in mechanical engineering, chemical engineering and materials science. It should also be of interest to practising engineers with petroleum companies and mechanical manufacturers.

Unit Operations in Food Processing

Unit Operations in Food Processing
Author: R. L. Earle
Publisher: Elsevier
Total Pages: 216
Release: 2013-10-22
Genre: Technology & Engineering
ISBN: 1483293106

This long awaited second edition of a popular textbook has a simple and direct approach to the diversity and complexity of food processing. It explains the principles of operations and illustrates them by individual processes. The new edition has been enlarged to include sections on freezing, drying, psychrometry, and a completely new section on mechanical refrigeration. All the units have been converted to SI measure. Each chapter contains unworked examples to help the student gain a grasp of the subject, and although primarily intended for the student food technologist or process engineer, this book will also be useful to technical workers in the food industry

Refrigeration and Airconditioning Data Book

Refrigeration and Airconditioning Data Book
Author: Manohar Prasad
Publisher: New Age International
Total Pages: 320
Release: 1989
Genre: Technology & Engineering
ISBN: 9788122401042

This Handy Book Contains Properties Of Refrigerants, Insulating Materials, Saturated Air, Some Liquids And Gases. The Storage Conditions Of Perishable Commodities, Design Conditions Of Various Cities Of The World, Relevant Data For Design Of Refrigeration And Air-Conditioning Systems Are Also Included.To Enhance Its Scope Tables Of Conversion Factors, Trouble Shooting And Remedies Of Refrigerators And Airconditioners Are Provided In Addition To Various Charts Of Refrigerants, Psychrometric Properties, Frictional Pressure Drop In Ducts, Mollier Diagram Etc.Definitions Of A Number Of Technical Terms Of Common Interest Would Be Quite Helpful To Users As A Ready Reference. This Book Is Hoped To Prove To Be The Most Beneficial To Faculty Members Of Technical Institutions, Design And Professional Engineers, Postgraduate And Undergraduate Students.

Low-temperature Technologies

Low-temperature Technologies
Author: Tatiana Morosuk
Publisher: BoD – Books on Demand
Total Pages: 278
Release: 2020-06-10
Genre: Science
ISBN: 1838806660

Low-temperature technologies include the area of refrigeration and cryogenics. Since the beginning of theoretical developments and practical application, these technologies become a part of our life. Low temperatures have found application in almost all branches of industries as well as in households. These systems can be of very small capacity (few watts) up to hundreds of megawatts. In order to develop any of the technologies for successful practical application, very intensive theoretical and experimental research should be conducted. This book provides the reader with a comprehensive overview of the latest developments, perspectives, and feasibility of new low-temperature technologies and improvements of existing systems, equipment, and evaluation methods.

Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee 2002

Refrigeration, Air Conditioning and Heat Pumps Technical Options Committee 2002
Author: United Nations Environment Programme
Publisher: UNEP/Earthprint
Total Pages: 213
Release: 2003-09
Genre:
ISBN: 9280722883

The 2002 assessment report, produced under the Montreal Protocol on ozone depleting substances, finds that technical progress has been made by the refrigeration, air conditioning and heat pump industry to comply with requirements to phase out CFCs and in several applications, HCFCs as well. However, there is still a significant amount of installed refrigeration equipment still using CFCs and HCFCs, and so service demand remains high and is best minimised by preventive service, containment, retrofit, recovery and recycling.

Refrigeration Systems and Applications

Refrigeration Systems and Applications
Author: Ibrahim Din¿er
Publisher: John Wiley & Sons
Total Pages: 990
Release: 2017-03-23
Genre: Technology & Engineering
ISBN: 1119230780

The definitive text/reference for students, researchers and practicing engineers This book provides comprehensive coverage on refrigeration systems and applications, ranging from the fundamental principles of thermodynamics to food cooling applications for a wide range of sectoral utilizations. Energy and exergy analyses as well as performance assessments through energy and exergy efficiencies and energetic and exergetic coefficients of performance are explored, and numerous analysis techniques, models, correlations and procedures are introduced with examples and case studies. There are specific sections allocated to environmental impact assessment and sustainable development studies. Also featured are discussions of important recent developments in the field, including those stemming from the author’s pioneering research. Refrigeration is a uniquely positioned multi-disciplinary field encompassing mechanical, chemical, industrial and food engineering, as well as chemistry. Its wide-ranging applications mean that the industry plays a key role in national and international economies. And it continues to be an area of active research, much of it focusing on making the technology as environmentally friendly and sustainable as possible without compromising cost efficiency and effectiveness. This substantially updated and revised edition of the classic text/reference now features two new chapters devoted to renewable-energy-based integrated refrigeration systems and environmental impact/sustainability assessment. All examples and chapter-end problems have been updated as have conversion factors and the thermophysical properties of an array of materials. Provides a solid foundation in the fundamental principles and the practical applications of refrigeration technologies Examines fundamental aspects of thermodynamics, refrigerants, as well as energy and exergy analyses and energy and exergy based performance assessment criteria and approaches Introduces environmental impact assessment methods and sustainability evaluation of refrigeration systems and applications Covers basic and advanced (and hence integrated) refrigeration cycles and systems, as well as a range of novel applications Discusses crucial industrial, technical and operational problems, as well as new performance improvement techniques and tools for better design and analysis Features clear explanations, numerous chapter-end problems and worked-out examples Refrigeration Systems and Applications, Third Edition is an indispensable working resource for researchers and practitioners in the areas of Refrigeration and Air Conditioning. It is also an ideal textbook for graduate and senior undergraduate students in mechanical, chemical, biochemical, industrial and food engineering disciplines.