The virtues of air refrigeration, including cheapness, availability and safety of the refrigerant used made it quite appealing to the early inventors of refrigeration machines. Air refrigeration dates back to the middle of nineteenth century, but it was not until 1877 that a reliable unit was developed. It was used mostly for cold-storage of meat on ships. However, the equipment [...]
Top 5 Methods of Refrigeration (Natural and Artificial Methods of Refrigeration)! 1. Natural Methods: (a) By Using Ice or Snow: The natural methods include the utilization of ice or snow produced naturally in cold climate. Ice melts at 0°C, so when it is placed in a space or system warmer than 0°C heat flows into ice and the space is [...]
Vapour Absorption Refrigeration System (with diagram)! The power utilized in vapour compression system is high grade energy i.e., electric power for running the compressor motor. In absorption refrigeration system, however, heat is directly utilized as source of energy. Of course, it may be preferable to utilize heat as such as it avoids undergoing through the various energy transformations required in [...]
In this article we will discuss about:- 1. Meaning of Refrigerant 2. Classification of Refrigerants 3. Properties. Meaning of Refrigerant: A refrigerant is a working substance which is used in refrigerating machine. It is a working fluid through which heat is transferred from the cold body to the hot body. Formerly the number of useful refrigerants was very limited. Air, [...]
In this article we will discuss about simple vapour compression refrigeration system. Introduction to Vapour Compression System: For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required: (i) Compression of the vapour, thereby increasing pressure. (ii) Condensing these vapours and rejecting heating to the cooling medium (usually water or atmospheric air). (iii) Expanding the [...]