ADsorption Chiller

Chillers are widely utilized throughout industry for process cooling applications and also in the commercial arena for comfort air conditioning. In these times of increasing energy costs and environment awareness, it’s becoming necessary to dramatically minimize energy wastage and where ever possible recovery valuable resources. Power generation is a notorious waster of energy. In your typical coal fired power station about half of the input energy is not utilized. Instead it’s released into the atmosphere, most commonly in the form of steam plumes.

Typically, for small private power producers, it’s either not viable or economically prudent to not include some means of waste heat recovery. Absorption chillers have been used for many years to utilize low grade and waste heat from power generators. Their use has been particularly beneficial where process cooling could also be locally employed. Whilst the basic absorption chiller concept is admirable from an environment protection perspective, unfortunately, absorption chillers have high maintenance costs, due to the fact that they use lithium bromide (LiBr) as their refrigerant. They are therefore economically disadvantaged and as such are not embraced by the large power users that produce the most GHG.

Now that’s all changing since the advent of the aDsorption chiller. Now, efficient energy conservation can be achieved by utilizing waste heat to drive an Adsorption Chiller, which can cost effectively replace any absorption chiller. Waste heat from systems such as diesel engines, gas engines, gas turbines, fuelcells, coal, biomass, & MSW fired boilers can all be used in conjunction with adsorption chillers to achieves co & tri-generation. Using the waste heat from various processes including: food (poultry, dairy products, juice, and breweries), chemical, plastic, rubber, paper and cement can enhance the heat balance of the process.

Another source of waste heat are steam boilers, that are used year round in such applications as hospitals and hotels, which can use their waste heat in the summer to cool their facilities. Additionally, the adsorption chiller can also tap into natures own waste heat such as geothermal wells and solar energy using solar water heaters.

The adsorption chiller is highly reliable and safe with low operating cost due its simplicity of operation. The adsorption chiller does not contain any Li-Br or other chemical refrigerant whichmeans no crystallization, no corrosion no chemical testing or hazardous leaks. The adsorption chiller also does not have high voltage motors or large compressors. The control system is self contained and trouble-free. No external temperature control valves are required to protect the chiller for capacity control. The adsorption chiller contains only water as the refrigerant and a proprietary, permanent silica gel which lasts 30 years as an adsorbent. The evaporator section cools the chilled water by the refrigerant (water) being evaporated by adsorption into the silica gel in one of two adsorbent chambers.

It can produce chilled water temperatures of less than 4°C with hot water temperatures ranging from 90°C to as low as 50°C. The hot water regenerates the silica gel in the second of the two adsorbent chambers. The water vapor released from the silica gel by the hot water is condensed in the condenser section which is cooled by a cooling water, such as, from a cooling tower.

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Key Benefits of ADsorption Chiller are;

  • No ammonia
  • No corrosion
  • No hazardous leaks
  • No chemical testing
  • No replacement
  • No compressor, which means;
  • No alignment issues
  • No high voltage
  • No high pressure
  • No overhaul
  • No oil change
  • No surging
  • No vibration or noise.
  • Stable chilled water output 3°C to 9°C
  • Driven by a wide hot water temperature range 90°C to 50°C
  • Stable operation, even with the fluctuating hot water temperatures and flow rates that are normal in waste heat recovery applications.
  • No back-up burner required.
  • Simple and short start-up & shutdown time
  • Constant operation - 24 hours, 7 days a week.
  • Energy Efficient
  • C.O.P. up to 0.75 using only hot water
  • Less than 1000 Watts of electricity used on 3 MW chiller

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    Optimized to use;

  • Engine jacket water
  • Turbine condensate
  • Flue exhaust heat
  • Excess steam
  • Two operating modes - Standard & Economy
  • Preserves process steam
  • Steady cooling output even with highly varying heat inputs
  • 1-3 year pay-back period
  • Sub-zero systems also available

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    Environment Friendly;

  • Reduces emissions of greenhouse gases
  • Reduces pollutants from the combustion of fossil fuels (CO, NOX, SOX, Hg, Pb, Benzene,...)
  • No freon
  • No lithium bromide
  • No contaminated water
  • No waste disposal required
  • No toxins produced in the operation or manufacture of adsorption chiller

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    Some Applications;

  • Gas, diesel, bio-fuel powered IC engines
  • (>50% thermal efficiency achievable when only using cylinder jacket water & >80% when also using exhaust gas)
  • Gas turbines (>90% thermal efficiency achievable)
  • Airport
  • Shopping centre
  • Office complex
  • Data centre
  • Hotel
  • Casino
  • Hospital
  • Industrial bakery
  • Pharmaceutical plant
  • Dairy product plant
  • Beverage plant
  • Cool storage warehouse
  • Underground mining
  • Gas plant pre-cooler
  • Process dryer using dehumidified air
  • Gas stream condensor
  • Industrial laundry

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    Product brochures:

  • General Brouchure

  • Performance specification sheet

  • Gas engine Example

  • Application diagram - Gas engine

  • Application diagram - Tri-generation

  • Application diagram - Hotel

  • Gas Turbine - Inlet air temperature optimisation