Abstract

The thesis is concerned with the development of a system for dissipating heat from a thermodynamic cycle operating in environments where fresh water is scare and ambient temperatures are high, therefore evaporative cooling is not an option whereas ambient temperatures are too high most of the day for adequate air cooling. An example of this is solar driven vapor compression cycles in desert climates. The proposed system exploits the substantially cooler night time ambient temperatures and the highly effective net radiation exchange with night sky. Since solar driven equipment require to operate during daytime when solar energy is available and hence their cycle heat is being rejected during day time hours when ambient temperatures are high, and the environment is hostile to cooling , the proposed system resorts to deferred cooling with the aid of thermal storage which can be in the form of sensible heat and water storage , however this water need not be potable and is re-usable. The thesis presents the details of implementation of the proposed system and mathematical model which can be used in its simulation and design. An experimental rig was purposely designed and built from which valuable measurements were obtained and used to demonstrate the application of the concept. Comparison between the model prediction and measurement revealed further important results. Theoretical investigation was also conducted using the proposed model to explore the system response and behavior under various weather and loading conditions. The model acts as a tool to evaluate any site’s suitability for the Deferred Cooling System (DCS) or possibly any other similar system employing radiative cooling. The results of those investigations revealed that the system is only recommended to be used under the right weather condition, in those conditions it is highly effective and efficient; indeed, it was adopted for the very hostile environment of Shallatin, Upper Egypt (23.1 °N latitude , 35.56 °E longitude ) , for a solar driven ice production project for fish preservation and proved to be quite successful.

Department

Environmental Engineering Program

Degree Name

MS in Environmental Engineering

Graduation Date

2-1-2019

Submission Date

January 2019

First Advisor

Serag Eldin, Mohamed Amr, Mohamed El Morsi

Committee Member 1

El Haggar, Salah

Committee Member 2

Fouad, Mahmoud

Extent

171p

Document Type

Master's Thesis

Rights

The author retains all rights with regard to copyright. The author certifies that written permission from the owner(s) of third-party copyrighted matter included in the thesis, dissertation, paper, or record of study has been obtained. The author further certifies that IRB approval has been obtained for this thesis, or that IRB approval is not necessary for this thesis. Insofar as this thesis, dissertation, paper, or record of study is an educational record as defined in the Family Educational Rights and Privacy Act (FERPA) (20 USC 1232g), the author has granted consent to disclosure of it to anyone who requests a copy.

Institutional Review Board (IRB) Approval

Not necessary for this item

Comments

I am very grateful to have been given the opportunity to work with my advisors Professor Mohamed Amr Serag El-din who has trusted me with his innovative idea and guided me through and Associate Professor Mohamed El Morsi whose thorough support and guidance in every step of the way have made it possible for me to accomplish this work. Thank you, it has been a true honor to have you as my advisors. I would like to dedicate this research work to the memory of my late mother Carmen Thabet who has been an inspiration for me throughout and hope to be able to provide the same drive for my kids Nora and Omar Helal who have been the most understanding and supportive kids. I would also like to thank my father Farouk Bedaiwy and my brother Sharif Bedaiwy for helping when their help was most needed. The American University in Cairo has been my home as an undergraduate and now as a graduate student. I would like to thank all of its staff and especially the Fluids lab technicians and engineers (particularly technician Haythem) for their help. A special thanks to Professor Salah El Haggar who has been my professor as an undergraduate student and has encouraged me throughout my masters.

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