VIEWS: 4 PAGES: 30 POSTED ON: 2/24/2012
Teknologi dan Rekayasa Ice Factory Lay out Section of three-dimensional layout of ice factory with capacity 12 metric tons/24 hours use ice molds 25 square standard print ice (from left to right) Blower : 'Roots' type to inject air make clear ice Agitator …….. the propeller, and the rod flange motor Overhead Gantry Crane and Ice Can filler that can fill the water to ice mold 20 longitude cage size of 25 kg at a time, on ice blocks factory with a capacity of 50 metric tons / 24 hours in Pekalongan, Central Java Appointment ice on ice in a Container Factory in Dhaka, Bangladesh. MOBILE FACTORY IN ES CONTAINERS Equipment Mesin refrigerator Evaporator / verdamper toes' Herring Bone 'which is usually made in the salt water tanks, and Horizontal shell & tube condenser can be replaced with the PHE (Plate Heat Exchanger). PHE right to brine (salt water / Ammonia) and cooling for the condenser PHE left (the water cooling tower / Ammonia). With LEU, only 15% required the use of refrigerant from the Herring Bone and Shell & Coils Tube condenser. Engine cooling package is equipped with vertical separator Liquid - Accumulator and Horizontal Liquid refrigerant Receiver with Ammonia Printed ice and time freezing Coagulation time is determined by the size of mold temperature of ice and salt water (brine) that can views based on the formula correlation R. Plank and the table below. PLANK FORMULA cooling capacity heat capacity (refrigerator ) To freeze 1 Ton water/24 Hour of air temperature +30 ° C and ice -5 ° C, with disregard differences in specific volume of water and ice, the capacity required heat (cooling): heat capacity (refrigerator ) Before freezing 1000 kg/24.60.60 sx 1000 (30-0) K x 4:19 kJ / kg.K = 1455 kW Latent heat at the time of freezing 1000 kg/24.60.60 sx 335 kJ/kg = 3877 kW After freezing 1000 kg/24.60.60 sx 1000 [0 - (-5)] K x 2.1 kJ / kg.K = 0122 kW So the amount of heat capacity theoretically is 5454 kW. However, in practical day-to-day many factors that affect the ice in the Factory, such as: • burden of heat agitator • Transmission heat (cold) water from the tub of salt that is not adequate and the timber cover isolasinya • Blow the air to make the ice clear increase heat load • The timber on the cover and pull out the ice water also increase the burden hot Heat Capacity (Refrigerator ) In general Pabrik add ice in 30% of the capacity calculation based on the theory additional burden to overcome the above, so that a 5454 kW x 1.3 = 7.09 kW (6100 kcal / day) Please note that the time of ice not all 24 hours, depending on the dimensions of the ice mold (see table above). To precisely calculate the heat capacity of the required compliance with freezing time according to your ice mold (not necessarily divided into 24 hours) and the mass of water included in the ice mold (usually water in the ice mold 50 kg weight over 60 kg, even to 70 kg), but still need to add additional heat load factor, which should not be 30%, depending on ice conditions factory you (see the additional heat load factors above). Determining Compressor Compressor capacity refrigerasi a highly depends on the operating Compressor Those parameters are: 1. Speed in rpm (rotation per minute) 2. Te Evaporating temperature in ° C (temperature refrigerant evaporasi / Ammonia) 3. Condensing temperature tc in ° C (condensation temperature refrigerant / Ammonia) 4. Superheat in K (summer go through the compression limit saturation vapor Te) 5. Subcooling in K (cooling go past the limit of the liquid saturation TC) comparing the capacity compressor When comparing the capacity of fruit Compressor 2 then the condition of all the parameters must be the same (speed, Te, TC, Superheat and Subcooling) Evaporating temperature Evaporating temperature for the Ice Factory, in general, set at a temperature of -8 ° C to -15 ° C, because salt water is usually working at a temperature -5 ° C and -12.5 ° C. Salt water temperatures lower than -15 ° C Ice akan make quick cracked beam es at the time of cancellation, because the difference in air temperature and ice which is very large. Condensing temperature Condensing temperature usually ranges between 35 ° C to 45 ° C, depending on the type of refrigerant used (Freon / Ammonia) is also the type of condenser (water cooled, water cooled or evaporative condenser) Superheat Superheat is the temperature difference between saturation temperature of vapor compression (Te) the temperature rise due to more heat from the surrounding environment (hot air in the engine room or engine heat alone piston's movement) to reach the saturation vapor temperature indeed. Ideal superheat 0 K dessentially difficult to achieve. Superheat generally ranged from 3 to 5 K. Subcooling Subcooling is a decrease in saturation temperature of liquid condensation with further using a heat exchanger (kalor trade) between Ammonia with water, air, or other refrigerant. Subcooling can achieve a decrease in temperature 5 to 10 K. When the heat is not used after condenser exchanger to lower the temperature of condensation of liquid saturation the sub-cooling is 0 K. TABEL COMPRESSOR GRASSO TABEL COMPRESSOR GRASSO TABEL COMPRESSOR GRASSO COP is the efficiency of Compressor (Refrigeration capacity divided by the absorbed power). If COP greater the number, the higher efficiency Compressor. EVAPORATOR / VERDAMPER CONDENSOR There are various types of condensor: 1. water cooled condensor TC 40 ° C to 45 ° C 2. water cooled condensor TC 38 ° C to 42 ° C 3. evaporative condenser TC 35 ° C to 40 ° C Air cooled condensor Air cooled condensor ………. is condensor using a wheel - a wheel (fin) and pipe (pipe) with using the air conditioner fan (fan). Rarely used when using refrigerant Ammonia,extravagant use of electricity and the price is not economical. Water cooled condensor is using condensor pipe with cooling water (which can be assisted with the cooling tower and shell & tube) or directly (condensor pipe that water flowed such as rain). More economical than air cooled condensor in the use of electricity. Water cooled condensor Water cooled condensor ….. is using condensor pipe with cooling water (which can be assisted with the cooling tower and shell & tube) or directly (condensor pipe that water flowed such as rain). More economical than air cooled condensor in the use of electricity. Evaporative condensor Evaporative condensor……. is a combination of water cooled (air) and water cooled (water) condensor. Using the grid - grid (fin), pipe (tube), water spray (water spray) and air fan (fan). Only using evaporative condensor, condensing temperature can reach 35 ° C for conditions in Indonesia.
"Teknologi dan Rekayasa"