The use of air conditioning in Hong Kong attributes a large proportion of our total electricity consumption, due primarily to its geographic location and economic activities.

In 2004, air conditioning accounted for 30% of the total electricity consumption. Our electricity consumption by air conditioning had a growth of about 17% from 35,125 Terajoule (TJ) to 42,246 TJ from 1994 to 2004. The use of air conditioning is expected to grow further in view of our increasing population and economic activities. We therefore need to take measures to improve our energy efficiency, in particular, on air conditioning.

Air-side systems/equipment

  • Displacement ventilation
  • Heat recovery equipment for air-side equipment
    • Thermal wheel and Desiccant total energy heat recovery wheel
    • Heat Pipes
    • Run-around coils
  • Liquid desiccant air conditioners
  • Microchannel heat exchanger
  • Radiant ceiling cooling

Water-side systems/equipment

  • Scale control technologies in water-side system
    • Automatic tube cleaning system
    • Dynamic-type pulsed-power devices (PPD)
    • Static-type magneto-hydrodynamic devices (MHD)
  • Heat recovery equipment for water-side equipment
    • Plate Heat Exchangers
    • Heat recovery chiller
  • Thermal energy storage
  • Water-cooled air conditioning system
    • Cooling Tower Scheme
    • Central Sea Water Scheme
  • District Cooling Scheme

Control system

  • CCMS

Other EE air-conditioning technologies

  • Anti-ultraviolet film
  • Heat pump in air-conditioning applications
  • Electronically commutated permanent magnet motors
  • VRV
  • Variable speed drive

Emerging EE air-conditioning technologies

  • All variable speed chilled water plant control
  • Adaptive or Fuzzy logic control
  • Novel thermal energy storage
  • Oil-free centrifugal compressor
  • Solid state refrigerant
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