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Pengantar Teknik Kimia Sesi 1 Peralatan Proses

Pengantar Teknik Kimia Sesi 1 Peralatan Proses. Ir. Abdul Wahid Surhim , MT. AIR COOLER. OLEH : KELOMPOK 2 Anatta Wahyu Budiman Angga Dwi Wibowo Anindya Adhi Wardhana Anny Aprilia Rabekka. Air Cooler.

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Pengantar Teknik Kimia Sesi 1 Peralatan Proses

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  1. PengantarTeknik KimiaSesi 1 PeralatanProses Ir. Abdul Wahid Surhim, MT.

  2. AIR COOLER OLEH : KELOMPOK 2 Anatta Wahyu Budiman Angga Dwi Wibowo Anindya Adhi Wardhana Anny Aprilia Rabekka

  3. Air Cooler Air coolers are a type of refrigeration system which uses simple evaporation as the cooling mechanism. This differs from traditional air conditioning, which uses a phase change heat pump with a compressor. Evaporative cooling is especially well suited for climates where the air is hot and humidity is low. In such areas, the installation and operating cost of a swamp cooler can be much lower than traditional air conditioning.

  4. Evaporative cooler designs • Direct Evaporative Cooling • Indirect Evaporative Cooling • Two-stage Evaporative Cooling

  5. Direct Evaporative Cooling • Direct Evaporative Cooling(open circuit) is used to lower the temperature of air by using latent heat of evaporation, changing water to vapor. In this process, the energy in the air does not change. Warm dry air is changed to cool moist air. Heat in the air is used to evaporate water

  6. Indirect Evaporative Cooling • Indirect Evaporative Cooling(closed circuit) is similar to direct evaporative cooling, but uses some type of heat exchanger. The cooled moist air never comes in direct contact with the conditioned environment.

  7. Two-stage Evaporative Cooling • Two-stage Evaporative Coolingtraditional evaporative coolers use only a fraction of the energy of traditional air conditioning systems. Unfortunately, except for in very dry climates, they may increase humidity to a level that makes occupants uncomfortable. Two-stage evaporative coolers do not produce humidity levels as high as that produced by traditional single-stage evaporative coolers. In the first stage of a two-stage cooler, warm air is pre-cooled indirectly without adding humidity (by passing inside a heat exchanger that is cooled by evaporation on the outside). In the direct stage, the precooled air passes through a water-soaked pad and picks up humidity as it cools. Because the air supply to the second stage evaporator is pre-cooled, less humidity is added to the air (because cooler air can’t hold as much moisture as warmer air). The result, according to the manufacturer, is cool air with a relative humidity between 50 and 70 percent, depending on the climate, compared to a traditional system that produces about 80 percent relative humidity air.

  8. Usage of Air Cooler • In higher humidity areas, there are many proven cost-effective uses for evaporative cooling that make it the preferred choice. For example, industrial plants, commercial kitchens, laundries, dry cleaners, greenhouses, spot cooling (loading docks, warehouses, factories, construction sites, athletic events, workshops, garages, and kennels) and confinement farming (poultry ranches, hog, and dairy).

  9. Advantages • Less expensive to install Estimated cost for installation is 1/8 to 1/2 that of refrigerated air conditioning • Less expensive to operate Estimated cost of operation is 1/4 that of refrigerated air. Power consumption is limited to the fan and water pump vs. compressors, pumps, and blowers. • Fresh air The constant stream of air from intake to vent through the building freshens the air in the building.

  10. Disadvantages Performance • High temperature, high humidity outside conditions decrease the cooling capability of the swamp cooler. • No dehumidification. Traditional air conditioners remove moisture from the air, which is sometimes a design requirement for an AC system. Comfort • The air supplied by the swamp cooler is typically 80-90% humid. • Very humid air prevents the evaporative cooling of sweaty or wet skin. • High humidity in air accelerates corrosion. This can considerably shorten the life of electronic equipment. • High humidity in air may cause condensation. This can be a problem for some situations (e.g., electrical equipment, paper/books, old wood). Water • Swamp coolers require a constant supply of water to wet the pads. • Water high in mineral content will leave mineral deposits on the pads and interior of the cooler. Water softeners, bleed-off and refill systems may relieve this problem, however. • Water line needs protection against freeze bursting during off-season, winter temperatures. Miscellaneous • Pollen, odors, and other outdoor contaminants may be blown into the building unless sufficient filtering is in place. • The vents that allow air to exit the building may pose a physical security risk. • Asthma patients may need to avoid evaporatively cooled environments.

  11. THE END Thank’s For Paying Close Attention

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