A simple Example of Energy Efficiency Concept

Energy efficiency

Energy efficiency is a very broad term referring to the many different ways we can get the same amount of work (light, heat, motion, etc.) done with less energy. It covers efficient cars on the roads, efficient ships in the waters, improved industrial practices, better building insulation and a host of other technologies. Since saving energy and saving money often amount to the same thing, energy efficiency is highly profitable and great contributor for the climate change issue. Energy efficiency often has multiple positive effects.

For a simple example, an energy saving light gives more amount of light by consuming less amount of electrical energy than a traditional light bulbs.Compared to traditional incandescents, energy-efficient light bulbs such as halogen incandescents, compact fluorescent lamps (CFLs) and light emitting diodes (LEDs) have the following advantages:

  • Consume about 25%-80% less energy than traditional incandescent lamps.
  • Can last 3 to 5 times longer, thus saving more money,
  • 4 to 5 times less energy consumption and thus saving more energy. So, less fuel consumption and less emissions from power plants.

Today’s energy-efficient bulbs are available in the wide range of colors and light levels you’ve come to expect. While the initial price of energy-efficient bulbs is typically higher than traditional incandescents, newer bulbs cost less to operate, saving you money over the life of the bulb. Many of the newer bulbs last significantly longer than traditional bulbs, so you won’t need to replace them as often.

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    Fig: Energy Efficient Bulb                          Fig: Traditional Incandescent bulb

The table below compares a 60 watt (W) traditional incandescent with energy efficient bulbs that provide similar light levels.
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Source: U.S. Department of Energy

Written by Mohammud Hanif Dewan, IEng, IMarEng, MIMarEST, MRINA

Mohammud Hanif Dewan, IEng, IMarEng, MIMarEST, MRINA

Working as the Deputy Commandant at LMTI, Liberia and Assistant Consultant at IMO. Worked as the Lecturer at ALAM Malaysia, IMA & CMC Bangladesh. Sailed as Chief Engineer on board various types of Tankers in multinational companies. Also worked as a consultant for developing and preparation of new syllabuses of marine engineering pre-sea and post-sea courses of Department of Shipping, Bangladesh as per STCW 2010 Manila Amendments. Writer of maritime articles. Researcher on Energy Efficiency in Shipping Industry, UTM, Malaysia.