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It starts as a gas that turns to a cool liquid and back to a gas through the process. While modern refrigerators certainly have more features and capabilities, many of the essential components and functions have amazingly stayed the same. endobj
in Journalism from the University of Nevada, Las Vegas.
The air circulation is by natural convection.In the Frost free refrigerators, the condenser tube is on the inside of the outer cabinet of the refrigerator.This arrangement prevents condensation on the outer cabinet in humid condition. The humming appliance in home kitchens, offices and hotel rooms around the country continuously transfer heat to keep your favorite foods at the correct temperature. ��C%G��#��G��? �1��� ���EI�2̈́:��/ ����M�0���RCZ@�[x�&jHL�k��a~���3���x+�K� To pull off this frosty feat, a refrigerator … <>
"Plastic Welding Technique Aids Refrigerator Assembly: Special Parts Replace Metal Anchors on Refrigerator Liners." A diagram of a typical vapor-compression refrigeration cycle can be superimposed on a pressure-enthalpy (P-h) chart to demonstrate the function of each component in the system. As a refrigerator temperature control, refrigerator thermostat has only one function — controlling the refrigerator's cooling system by turning it on or off to ensure that the temperature inside the fridge stays in the correct range of 33 to 40 degrees Fahrenheit. A refrigerator consists of a few key components that play a vital role in the refrigeration process: Expansion valve. The refrigerant is sent to the condenser.
It is usually done by an artificial means of lowering the temperature, such as by the use of ice or mechanical refrigeration, which is a mechanical system or apparatus, designed and constructed to transfer heat from one substance to another. The highest temperature would raise the condensing temperature and reduced cooling capacity of the coil.Hot food should not be placed in the refrigerator. The exception is with built-in refrigerators, which usually place the compressor(s) on top.The condenser is where the refrigerant liquefies. <>
The essential function of refrigerators is to use the evaporation of a liquid (refrigerant) to absorb heat. Hot food in the refrigerator raises the evaporated temperature causing overloading of the compressor.During the opening of the refrigerator, cold air leaks out at the bottom and warm air enters at the top. The compressor is typically found along the bottom of the refrigerator, towards the back. The motor revs up the compressor to increase the temperature and pressure the refrigerant. A refrigerator is an insulated box in which low temperature is maintained to facilitate salt or medium-term storage of food.The refrigerator is usually specified as per volumetric capacity on the inside.It is available in the capacity of 65 liters, 100 liters, 165 liters, 275 liters, to double door refrigerator of capacity as large as 1000 liters.Large size refrigerator comes with independent compartments as per food categories.So you get freezer cabinet, vegetable pulls out compartment and so on.Most of the refrigerator comes with painting Stell sheet cabinet on the outside with strong industrial plastic inner cabinet for rust proofing shown in the figure.In early refrigerators, cork expanded polystyrene ( Thermocol ) sheets or granules were used for insulations.But nowadays polyurethane foam is the most common insulation used in in the refrigerator.The door of the cabinet is provided with a neoprene rubber gasket to prevent leakage of air from the cabinet.The inner cabinet and the inner panel of the door are suitably formed to provide trays for different categories of food.Small refrigerator 165 liters the circulation of air for cooling is by natural convection.This allows a range of temperature from -20 degree Celsius in the freezer cabinet at the top to about 5 degree Celsius in the vegetable tray located at the bottom.The trays are not solid to allow air flow through the trays for circulation of air.The temperature is maintained within a range by cyclic control.The compressor cuts off at lower end i.e cut off temperature and restarts at Higher end i.e cut in temperature.Refrigerators are used mainly in keeping the refrigeration space cold.By keeping the refrigeration space cold, the presence of micro-organisms such as Bacteria, Fungi is slowed down. Murray, Charles J. This ensures an adequate circulation of atmospheric air over the condenser tubes.Clean surface of condenser ensures that condenser temperature does not increase due to inadequate heat transfer.The refrigerator should not be located in hot rooms like a kitchen. It starts in the form of a gas, then a liquid, and back to a gas as it cycles through the refrigerator’s parts. A special coolant called a refrigerant functions in a refrigerator the way alcohol works on your skin, except in a refrigerator, the coolant is trapped inside a series of coils.
Principle of refrigeration: It is based on the second law of thermodynamics that the heat can made to flow from cold body to a hot body with the help of external source. 2. Accessories will help you to decorate and take full utilization of refrigerator. It is switched off before the restart of the compressor.In this refrigerators, there is forced air circulation due to a finned evaporator and independent compartments.It is hermetically sealed unit with the reciprocating compressor as the most common type of compressor.In some large refrigerators, use of rotary or screw compressor is possible.
They are not able to multiply fast enough to damage cells present in our foods and drinks.Therefore, our food and drinks could be preserved over a long duration.In the System, the bacteria and fungi become inactive under extremely lower temperatures.For medical use, items such as blood and vaccines are stored in it for preservation.For Scientific use, experimental samples are stores in it.Used for making ice and ice-creams apart from storage of food.Many drugs which are to be kept away from direct sunlight and heat like insulin are also stored in refrigerators for longevity.The refrigerator should be placed at least 15 cm from the wall.
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