Course Content
Introduction to Refrigeration
In this brief introduction to refrigeration, you will learn about the necessity and applications of refrigeration, the unit of refrigeration and COP, and the principles of mechanical refrigeration. Join us as we explore the key components and advancements in this critical field, essential for modern comfort and technology.
Air Refrigeration
"Air Refrigeration" refers to the process of cooling air by removing heat from it. This can be achieved by using mechanical refrigeration or air refrigeration systems, such as the Bell-Coleman cycle or the Brayton cycle. In air refrigeration systems, compressed air is passed through a heat exchanger where it loses heat, and the cooled air is then used to cool a space or system. The efficiency of air refrigeration systems is measured by the coefficient of performance (COP) which is a ratio of the amount of heat removed to the energy required to run the system.
Vapour Compression Refrigeration
Vapour compression refrigeration (VCR) is a widely used type of refrigeration system that operates on the basic principles of thermodynamics. The system uses a refrigerant that is cycled through a series of components, including a compressor, condenser, evaporator, and expansion valve, to transfer heat from one location to another. The refrigerant evaporates at low pressure in the evaporator, absorbing heat from the surrounding environment, and then is compressed in the compressor to a high-pressure, high-temperature state. The high-pressure refrigerant then releases its heat in the condenser, where it condenses back into a liquid, and is then expanded back into a low-pressure, low-temperature state in the expansion valve. This process is repeated continuously, providing a constant flow of cool air to the surrounding environment.
The overview of the general classification and working principles of compressors. The students will learn about the different types of compressors and their advantages and disadvantages. This session will focus on imparting a thorough understanding of the role of compressors in the refrigeration system and how they contribute to its performance
The Condensors topic in the field of Refrigeration and Air Conditioning focuses on the classification, working principles, and types of condensors used in the refrigeration systems. A condenser is a critical component of a refrigeration system that removes heat from the refrigerant by condensing it into a liquid. The condenser must maintain a low pressure and high temperature to allow the refrigerant to condense.
The topic of Evaporators in the field of Refrigeration and Air Conditioning focuses on the classification and working principles of evaporators. An evaporator is a key component in a refrigeration or air conditioning system as it is responsible for absorbing heat from the surrounding environment and transforming the refrigerant from a liquid to a vapor. The purpose of the evaporator is to reduce the temperature of the refrigerant, allowing it to absorb heat from the space being cooled
Expansion device
Expansion devices are an important component in refrigeration and air conditioning systems. They are responsible for controlling the flow of refrigerant from the high-pressure side of the system to the low-pressure side. The main function of expansion devices is to reduce the pressure and temperature of the refrigerant, which then evaporates and absorbs heat
The topic of Refrigerants covers important aspects of the field, including desirable properties, the effects of ozone depletion and global warming, azeotropes and zoetropes, and the classification and properties of refrigerants themselves.
Vapor Absorption System
The Vapor Absorption System is a type of refrigeration system that uses a liquid-vapor working pair to transfer heat. It consists of a generator, condenser, evaporator and absorber. The vapor refrigerant produced in the generator is absorbed in a suitable liquid, causing it to vaporize and absorb heat. This vapor is then condensed in the condenser, releasing the heat and converting the refrigerant back into a liquid. The liquid is then pumped back to the evaporator to repeat the cycle. The efficiency of the Vapor Absorption System is determined by the concentration of refrigerant in the liquid, the temperature of the heat source, and the pressure difference between the generator and condenser.
Refrigeration and Air Conditioning
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