ANALISA MESIN PENDINGINAN PADA KAPAL IKAN ( REFRIGERATED SEA WATER )

Abstract

Refrigeration is the artificial production of low temperatures ranging from the normal ambient-air temperature down to absolute zero. For cooling in the temperature range down to -200F, vapor - compression refrigerations may be use reciprocating, rotary, or centrifugal compressor. For some applications within this band, air-cycle refrigeration, steam-jet refrigeration, or absorption refrigeration may be applied. For the production of extremely low temperatures down to absolute zero, irreversible or reversible adiabatic expansion of a gas, vaporization of a liquefied gas, or magnetic cooling may be used. Refrigerated Sea Water uses vapor-compression refrigeration cycle with reciprocating compressor in this application. The thermodynamic properties of refrigerants must be known before the cycle analyses can be made. A study of evaporators and condensers, those portions of the system used for the absorption and rejection of heat, respectively, involves the fields of heat transmission and fluid mechanics, steady state and periodic and transient heat tranfer are involved in the determination of cooling-load requirements. The calculation of cooling loads are also requires a knowledge of psychrometry. The physical capacity of a compressor or expander will be determined from thermodynamic factors, but the physical design must also involve structural considerations. The result of refrigeration analysis are refrigeration capacity 6,15 TR, average coefficient of performance 5,87 and total capacities of refrigeration 20240,5 Kcal/h. Refrigerant used R 22 with vapor compression system and evaporator temperature -2C and condenser temperature 37C