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Basic Mechanical Engineering by Pravin Kumar

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8

Refrigeration and Air Conditioning

Chapter Objectives

In this chapter, you will learn about:

  • Working principles of refrigerator and heat pump
  • Types of refrigeration systems
  • Types of refrigerants
  • Type of refrigerators
  • Type of room air conditioners
8.1  INTRODUCTION

Initially, the main purpose of refrigeration was to conserve foods. The Chinese were the first to find out that ice increased the life and improved the taste of drinks and for centuries Eskimos have conserved food by freezing it. At the beginning of the 19th century, it had been observed that the growth of microorganisms is temperature dependent, that growth declines as temperature falls and that growth becomes very slow at temperatures below +10°C. As a consequence of this ...

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