STUDY AND DEVELOPMENT OF ELECTRIC-LESS REFRIGERATION SYSTEM Kemparaju C R 1, Ronald Reagon R2 1,2 Assistant Professor, Department of Mechanical Engineering, New Horizon College of Engineering, Outer Ring Road, Bengaluru-560103. Abstract: Our works by passively drawing in warm ambient air through the funnel (converging nozzle), which is fed into an aluminum pipe that’s been buried underground. This already starts to cool down the air before it's fed into coiled cooper pipe that’s been placed just above the water in the evaporation chamber. The evaporation process is helped along by a small, solar-powered fan. The water evaporating around pipe condenses on the coil, this condensed vapor absorbs the heat from the air which is flowing inside therefore chills the air inside, and this is then fed back underground before entering the refrigeration chamber. Key Words: Refrigeration chamber, Converging nozzle, Aluminum pipe I. INTRODUCTION Refrigeration may be defined as the process of achieving and maintaining a temperature below that of the surroundings, the aim being to cool some product or space to the required temperature. One of the most important applications of refrigeration has been the preservation of perishable food products by storing them at low temperatures. Refrigeration systems are also used extensively for providing thermal comfort to human beings by means of air conditioning. Air Conditioning refers to the treatment of air so as to simultaneously control its temperature, moisture content, cleanliness, odour and circulation, as required by occupants, a process, or products in the space. The subject of refrigeration and air conditioning has evolved out of human need for food and comfort, and its history dates back to centuries. II. EARLIEST FORMS OF COOLING The seasonal harvesting of snow and ice is an ancient practice estimated to have begun earlier than 1000 B.C. A Chinese collection of lyrics from this time period known as the Shih king, describes religious ceremonies for filling and emptying ice cellars. However, little is known about the construction of these ice cellars or what the ice was used for. The next ancient society to harvest ice may have been the Jews according to the book of Proverbs, which reads, “As the cold of snow in the time of harvest, so is a faithful messenger to them who sent him.” Historians have interpreted this to mean that the Jews used ice to cool beverages rather than to preserve food. Other ancient cultures such as the Greeks and the Romans dug large snow pits insulated with grass, chaff, or branches of trees as cold storage. Like the Jews, the Greeks and Romans did not use ice and snow to preserve food, but primarily as a means to cool beverages. The Egyptians also developed methods to cool beverages, but in lieu of using ice to cool water, the Egyptians cooled water by putting boiling water in shallow earthen jars and placing them on the roofs of their houses at night. Slaves would moisten the outside of the jars and the resulting evaporation would cool the water. The ancient people of India used this same concept to produce ice. The Persians stored ice in a pit called a Yakhchal and may have been the first group of people to use cold storage to preserve food. In the Australian outback before a reliable electricity supply was available where the weather could be hot and dry, many farmers used a "Coolgardie safe". This consisted of a room with hessian "curtains" hanging from the ceiling soaked in water. The water would evaporate and thereby cool the hessian curtains
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