By: Jason Maxwell
Submitted: 2010-11-25 20:11:27 | Word Count: 470
Freezers can be classified into different types and one of these types include walk in freezers which are refrigeration devices big enough to store meat and other food items. Today, businesses including grocery stores and restaurants are utilizing these units for storing by bulk.
Refrigeration is a branch of mechanical engineering that focuses in providing means of inducing heat flow away from objects or spaces which it is desired to maintain at temperatures lower than their surroundings. Heat is energy in transition as a result of temperature difference. Thus, to achieve refrigeration it is necessary to provide a heat “sink” and maintain it at a temperature lower than its surroundings. The greatest amount of refrigeration is obtained through mechanical or chemical means. In essence, all mechanical refrigeration systems are thermal pumps.
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The vapor cycle of mechanical refrigeration is carried out in four mechanisms connected to form a closed refrigerant circuitcompressor, condenser, expansion valve, and evaporator or cooler.
A widely used method of reducing the first and operating costs of the installation is to size the compressor for continuous operation, providing a means of storing the refrigeration for withdrawal at the required rate during brief intervals when the load exists is ideal for businesses that require refrigeration. For instance, a dairy, may require a cooling effect at a 4-ton rate for two 3-hr. periods per day. This load can handled by installing a 4-ton machine, but the electrical-demand charge for such a unit would make the operation cost high and its size would be responsible for a substantial first cost.
If a 1-ton compressor would be installed and operated continuously, the quantity of cooling made available by it during each 24-hr. period would be exactly the same as that provided by the 4-ton unit when operated for a total of 6 hrs out of 24. The first cost of the smaller compressor would be less, but this saving would be at least partially offset by the added cost of such refrigeration-storage equipment as might be required. The operating cost would be less for the smaller compressor excluding the losses because of the great reduction in the utilities-demand charge.
Different methods have been used for storing refrigeration. Tanks of brine or water are reduced in temperature during the non-use period and then allowed to gain a substantial temperature increment during the brief periods when the refrigeration is required.
These commercial refrigeration systems are very important for businesses that require food to be stored for future use. These devices make it possible for business to conserve a lot of time and effort.
Author Resource:-
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