(NAR) VOL. 29 NO. 1/ JANUARY - MARCH 18
Energy Efficient Equipment |
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Categorie s | Lis t of S pecific T echnology |
Heating Ventilation Air | 1 . S ol ar Ther m al AC S yste m s |
Motor , fans and pumps | 3 . Integrated vari able speed m otor s 4 . Switched-reluctance drives |
Chillers | 6 . Compressor Chillers with variable- frequency drives |
I. Heating Ventilation Air Conditioning (HVAC) upgrades (e.g., inverter types)1. Solar Thermal AC Systems – Active solar cooling uses solar thermal collectors to provide solar energy to thermally driven chillers (usually adsorption or absorption chillers). Solar energy heats a fluid that provides heat to the generator of an absorption chiller and its recirculated back to the collectors. The heat provided to the generator drives a cooling cycle that produces chilled water. The chilled water produced is used for large commercial and industrial cooling.II. Motor, fans and pumps
Solar thermal can be used to efficiently cool in the summer, and also heat domestic hot water and buildings in the winter. Single, double or triple iterative absorption cooling cycles are used in different solar- thermal-cooling system designs. The more cycles, the more efficient they are.
2. Inverter Type Air-con System – Inverter air-con helps to control the speed of the compressor motor, thereby changing the temperature as per requirement. It can detect sudden fluctuation in the room temperature, which leads the compressor to slow down or work faster. As soon as the room temperature reaches the set temperature, compressor slows down, thereby maintaining a constant temperature. This highly helps to save energy. Generally, inverter air-con’s need 30-
50% less electricity than non-inverter air conditioner.III. Chillers
- Integrated variable speed motors – These can lead to greater cost savings over the life of the motor. In terms of efficiency, integrated variable speed motors have the same energy saving benefits as a non- integrated motor and VSD.
- Switched-reluctance drives – These machines consist of a switched- reluctance motor and dedicated electronic controller. Their performance is similar to that of a conventional induction motor and VSD. In addition, they are capable of every high-speed operation (up to 100,000rpm). These devices have an energy efficiency performance similar to, and in some cases exceeding, that of an induction motor with a VSD.
- DC drives – These machines consist of a DC motor and dedicated electronic controller. DC motors/drives operate from a different type of electrical supply than AC motors/drives and as such have different characteristics. Efficiency-wise, the performance of DC drives is similar to that of a conventional induction motor with a VSD. DC drives were the main form of variable speed control before the advent of VSDs. They are still in use today in specialist applications where high starting torques and variable speeds are required, such as pulsating loads, shears, bending rolls, plunger pumps, conveyors, elevators and crushers.
Compressor Chillers with variable-frequency drives – centrifugal chillers with a variable-frequency drive offer high efficiency over a wide range of cooling loads. High-efficiency chillers often can reduce cooling energy requirements by 30% to 50% annually.