Today’s systems are designed to meet the stricter requirements of environment, indoor air quality and the user. As a result of improvements in the operating efficiency of key system components, many of the gains in HVAC system efficiency have come. I strongly suggest you to visit HVAC repair to learn more about this. Other gains result from the use of either new or new technologies in the HVAC field. Even the use of computer-aided design tools has helped system engineers design better performing HVAC systems.Although there are many individual advances that have helped improve operating efficiency of HVAC systems, five key factors can be attributed to much of the overall improvement:
— Low kW / tonne chillers developed;
— The application of high efficiency boiler control systems;
— The use of Digital Direct Control (DDC) systems;
— The use of power-efficient engines; and,
— Matching variable frequency drives with pump, ventilator and chiller motors.
The performance and efficiencies of chillers that operated in the range of 0.8 to 0.9 kW / tonne when new have satisfied building owners for years. As they age, the actual operating efficiencies at full load drop to more than 1.0 kW / tonne.
New chillers with full load-rated efficiencies of 0.50 kW / tonne are being installed today, an increase of nearly 50 per cent. The part-charge efficiencies of the new generation of chillers are equally impressive. Although the operating efficiency of almost all older chillers is falling rapidly with decreased load, the operating efficiency of new chillers is not dropping off almost as fast.
Various changes in design and operation have helped improve chiller performance. To improve the chillers’ heat transfer characteristics, manufacturers have increased the size of heat exchangers for the units. Electromechanical control systems were replaced by electronic controls based on microprocessors which provide greater precision, reliability and flexibility. Variable frequency drives control the compressor velocity, resulting in increased performance of part loads.
Increased energy efficiency is not the only benefit of new generation of construction chillers; these chillers offer better containment of refrigerants. While older chillers may have routinely lost 10 percent to 15 percent of the refrigerant charge per year, new chillers can reduce losses to less than 0.5 percent.
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