AIR COOLER OLEH : KELOMPOK 2 Anatta Wahyu Budiman Angga Dwi

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AIR COOLER

• OLEH KELOMPOK 2
• Anatta Wahyu Budiman
• Angga Dwi Wibowo
• Anindya Adhi Wardhana
• Anny
• Aprilia Rabekka

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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.

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Evaporative cooler designs

• Direct Evaporative Cooling
• Indirect Evaporative Cooling
• Two-stage Evaporative Cooling

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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

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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.

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Two-stage Evaporative Cooling

• Two-stage Evaporative Cooling traditional
  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 canât 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.

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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).

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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.

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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.

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THE END

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