Energy efficiency is the use of small amounts of energy for the same amount of product/service (heating or cooling, lighting, production of various products, drive vehicles, and others). It is important to emphasize that energy efficiency should not be seen as saving energy. Saving always involves some renunciation, while the efficient use of energy never violates the conditions of work and life.
Energy-efficient device is one that has a high degree of efficiency, and they achieve a small loss of energy during transformation of one form of energy into another. For example, an ordinary incandescent light bulb converts a large part of the electrical energy into heat, and only a little bit of energy into useful light. Therefore, the incandescent light bulb is an energy inefficient device, unlike the led light bulb.
Energy efficiency appears in all energy consumption sectors: industry, trade, service industries, agriculture and households. Well, it will be presented some measures of efficient energy use in industry and household.
Energy efficiency measures in the industry
Each type of industry requires a considerable amount of energy for a variety of industrial processes, so the energy saving is very important. Here are some useful measures of efficient energy use in industry:
- During the production of electricity, heat energy that is produced as a by-product can be used for space heating, process steam or other industrial purposes.
- Advanced furnaces and boilers can work at higher temperatures while burning less amount of fuel.
- A large amount of fuel used by manufacturers is burnt to make steam. Condensate return lines and insulation of steam stop the unnecessary loss of steam and reduce energy usage.
- Variable speed of electric motors achieves energy savings of 3 to 60%, depending on method of use. Motor coils that are made of some superconducting materials contribute to improved energy efficiency.
- The efficiency of compressors and pumps can be increased by implementing better maintenance and better process control.
Energy efficiency measures in homes
Some of the energy efficiency measures that reduce energy losses and increase efficient energy use in homes (households) are:
- Improving the efficiency of the systems for the supply of heat or electricity by dismantling of old equipments and installing new energy-efficient equipments.
- Systematic and planned maintenance of equipment.
- Elimination of leakage of steam, water and compressed air into energy systems.
- Installation of high efficiency lighting – Replacing standard light bulbs (incandescent bulbs) with energy saving bulbs (e.g. led light bulbs). LED bulbs have a longer lifetime compared to incandescent bulbs, consume 90% less power than conventional lamps but they have higher initial costs. The efficiency of LED bulbs continues to improve.
- Replacement of non-renewable energy sources with renewable (especially solar energy for solar home systems). Renewable energy improvements can contribute to more efficient heating of the house.
- Replacement of inefficient home appliances with energy-efficient devices. Modern home appliances, such as, clothes washers and dryers, dishwashers, stoves, ovens, freezers, use significantly less electrical energy than older home appliances.
- Installation of measuring and regulating devices for electrical appliances in the household.
- Installation of high-efficiency boilers for home heating.
- House thermal significantly reduces heat losses, and leads to greater energy efficiency.