# Cooling

Powerful Essays
i

Free Convection
Cooling Variation in Terms of Position

By
Joseph Saba
Rula Dahdal

Submitted to
Dr. Michel Daaboul

A research paper submitted in partial fulfillment of the requirements of the course
MECH 321 Heat Transfer

Faculty of Engineering
University of Balamand

June 2012

ii

ABSTRACT
This research paper aims is to introduce a brief positioning on how we can enhance the process of cooling refrigerant tanks. This process is usually done globally, both domestically and inside shops in the market s. Yet, there is no specific awareness for both marketing specialist –sellers- or to regular public, on the effect of the position on the cooling rate. In this brief study, we investigated three different cases, assuming there is no effect of conduction or radiation heat transfers on the process of cooling .

This paper starts with a brief definition, in addition to a historical review of heat transfer, and how it progressed to be separate science nowadays. I ntroduction to the different kinds of heat transfer phenomena is also introduced to the readers who have no background of what does heat transfer and its types mea n. In depth, explanation of the process of free or natural convection is carried out ; including the variables, dimensionless factors, and conditions involved. Afterwards, this document gives instructions on how to calculate the total heat transfer for a st andard carbonated drink container. Moreover, just following the detailed instructions, any reader would be able to use this data to determine the heat transfer rate for any cylindrical container, by just replacing values of certain variables. At the end of this document, conclusions are drawn based on theoretical data obtained for the different three cases/positions investigated.

iii

ABSTRACT

ii

iii

CHAPTER

## You May Also Find These Documents Helpful

• Better Essays

The objective of this lab was to determine the convective heat transfer coefficient of a heated sphere in an quiescent environment. In the experiment a hot brass sphere was put into water and cooled. The temperature of the sphere was recorded over a time of 600 seconds to see how it cooled and given temperature was recorded every 20 seconds. Results were then calculated at both of the time values 300 and 600 seconds. For the experimental results at time 300 seconds, the Rayleigh number, Ra=2,973.30, Nusselt number, Nu=5.36, and the heat transfer coefficient, h1=11.10. At time 600 seconds the results were; Ra=1,207.22, Nu=4.68, h2=9.70. The experimental heat transfer coefficient was 18.72 ± 2, and the theoretical heat coefficient was 10.40. Once plotting the data on a temperature vs. time graph, the data points at time 300, and 600 seconds were used to find the slope and equation of the graph. The graph had a negative slope and the equation of the line was y= -0.0028x - 0.8692.…

• 1114 Words
• 5 Pages
Better Essays
• Powerful Essays

Apply concepts of temperature and heat as energy to solve problems concerning the transfer of heat and effects of heat on systems.…

• 2190 Words
• 9 Pages
Powerful Essays
• Good Essays

reactions, physical changes, and phase transitions for the intention descending the heat or heat transfer…

• 1078 Words
• 5 Pages
Good Essays
• Satisfactory Essays

Heat, also called thermal energy, can be transmitted through space (radiation), by moving fluids (convection), or through direct contact. This final method, called conduction, is explored in the Heat Transfer by Conduction Gizmo™.…

• 837 Words
• 4 Pages
Satisfactory Essays
• Good Essays

The heat transferred from hot water to cold water is due to their potential (temperature) difference.…

• 1398 Words
• 6 Pages
Good Essays
• Good Essays

• • • • All forms of energy can be converted to heat Thermodynamics – “study of heat changes” Actually a type of kinetic energy Enthalpy (H): Heat content…

• 1121 Words
• 5 Pages
Good Essays
• Good Essays

Transfer of heat is a major theme of thermodynamics, the science of heat exchange (or energy exchange).…

• 2259 Words
• 11 Pages
Good Essays
• Good Essays

Incropera, Frank and DeWitt, David, Fundamentals of Heat and Mass Transfer, John Wiley & Sons, USA, 2002.…

• 7865 Words
• 32 Pages
Good Essays
• Good Essays

• Understand and observe the concept of Heat Transfer, by measuring the temperature distribution for steady state conduction of energy through a specific efficient unit.…

• 927 Words
• 4 Pages
Good Essays
• Good Essays

Describe how heat is transferred when food is cooked by conduction, convection, radiation and microwave…

• 1561 Words
• 7 Pages
Good Essays
• Satisfactory Essays

Conduction, convection, and radiation are things that exist in our life. Thanks to that stuff we have things like electricity and things to cook too. I am going to explain things about energy transformation. Heat transfer is the way heat moves through matter to change the temperature of other objects. There are three types of heat transfers, Conduction, Convection, and Radiation. The first kind of heat transfer, conduction, is heat transferring through direct contact of materials. The next type of heat transfer is convection. Convection is heat transferred by a gas or liquid. The last type of heat transfer is radiation. Radiation is when the heat energy travels in actual waves.…

• 502 Words
• 2 Pages
Satisfactory Essays
• Better Essays

It is important to know the difference between heat and temperature. It will lead to a clearer understanding of energy. In this paper, I will define both terms and hopefully reach an understanding of how they are related but not identical.…

• 832 Words
• 4 Pages
Better Essays
• Good Essays

Wind chill is the perceived decrease in air temperature felt by the body on exposed sin due to the flow of cold air.…

• 1416 Words
• 6 Pages
Good Essays
• Powerful Essays

Heat transfer processes are prominent in engineering due to several applications in industry and environment. Heat transfer is central to the performance of propulsion systems, design of conventional space and water heating systems, cooling of electronic equipment, and many manufacturing processes (Campos 3).…

• 2310 Words
• 10 Pages
Powerful Essays
• Good Essays

In the engineering sciences, heat transfer includes the processes of thermal radiation, convection, and sometimes mass transfer. Usually more than one of these processes occurs in a given situation. The conventional symbol for the material property,…

• 1005 Words
• 5 Pages
Good Essays