07-08-2012, 04:59 PM
Energy Efficient Technologies
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Energy and the Environment
Energy production causes particulate emission, acid rain and global warming
Energy efficient technologies help the environment & are cost effective
Other green initiatives may not be cost effective but have intangible benefits and improve corporate image, e.g. renewable energy
Energy efficiency of a country should be considered under 3 issues:
Economic efficiency is a measure of the energy required to support economic activities (MW/GDP)
Societal efficiency is a measure of the amount of energy used by each citizen (MW/GDP)
Environmental efficiency is a measure of the amount of emission to produce unit energy (CO2 emission per MW)
Architectural Measures
Building orientation to enhance natural ventilation and natural lighting and to reduce solar gains
Sun shading devices
Central location of plant rooms to minimize losses
Stacking of plant rooms on different floors
Improving OTTV (overall thermal transfer value)
Better glazing: low-E & reflective glass
Green roof
Better insulation of external facade
Reduce infiltration
T5 HE & T5 HO
Lumen output: 2900 lm Vs 5000 lm
Lamp power: 28W Vs 54W
Efficacy: 104 lm/W Vs 93lm/W
Maintenance at 10000hr: both 92%
Rated Life: both 20000 hr
T5 HE lamps are suitable for replacing T8 lamps
Plug & enhance adaptor is available for installing T5 tube directly into a T8 fitting
T5 HO lamps are suitable for space with high ceiling
Advantage of T5
Energy efficient with pay back within 2 years
Fits exactly into ceiling grid
Suitable for viewing computer monitor
Better lumen maintenance and longer lamp life
Optimum performance at 350C
T5 fitting is only 50 mm deep and can suit congested ceiling space
More environmental friendly due to less mercury, material in production and packaging (1xT8=2.5T5)
Compact Fluorescent Lamp
The principles of operation of CFL are similar to fluorescent lamp
CFL is designed as substitute for incandescent lamp
A 20W CFL is as bright as a 100W incandescent lamp i.e. saves 80% energy
Pay back period is less than a year
It has a longer lamp life than incandescent lamp