The document discusses the components and working principle of a refrigerator, including its compressor, condenser, evaporator, and throttling device that use a vapor-compression refrigeration cycle to transfer heat from inside the refrigerator to the external environment, maintaining a low temperature inside based on the second law of thermodynamics. It provides an outline of contents that will discuss the background, components, working principle, physics, and conclusion of how a refrigerator functions.

1. .
PHY109: Engineering Physics-I
Semester: Spring-2019
Section-01
REFRIGERATOR
Group-05
Tahsin Jawed 2015-1-60-00
Nahid Hasan Ashik 2017-2-60-080
Md Nazmul Hasan 2016-1-60-053
Presentation On
Good Evening
Welcome to Our Presentation

2. .
 Background
 Components
 Working Principle
 Physics behind this.
 Conclusion
Outline of Contents

3. .
 Definition
A refrigerator is an appliance that consist a thermally insulated
compartment and heat pump that transfers heat from the inside of the fridge
to external environment.
 History
In 1834 the first working vapor-compression was built. In 1913
refrigerator for home use were invented.
Background

4. .
 It has four major components:
 Compressor
 Condenser
 Evaporator
 Throttling Device
Major Components

5. .
Working Principle
 Throttling Device:
High pressure liquid refrigerant law pressure
liquid refrigerant+ temperature also decreased.
 Evaporator:
Law pressure liquid refrigerant Vapor
refrigerant.
 Compressor:
Law pressure vapor refrigerant High pressure +
High temperature vapor refrigerant.
 Condenser:
High pressure + High temperature vapor refrigerant.
High pressure & law temperature vapor

6. .
 The second law of thermodynamics says that heat can flow from
high temperature reservoir to low temperature reservoir only.
 In our refrigerator, the freezer is maintained at low temperature by
removing the heat from it and throwing it to the atmosphere which
is at higher temperature. This does not happen automatically, we
have to supply electricity which is used to run the compressor of
the refrigerator.
Physics Behind the Working Principle

7. .
 Advantage
 Disadvantage
Conclusion

8. ThankYou