With the advent of summer, ceiling fans start rumbling in homes throughout the country. With our country’s economy not supporting installation of air conditioners in homes in a large majority nor the power deficiency situation supporting it in any manner, ceiling fans do become panache for most of the people. Running at full speeds, they become as integral to our lives as food and water and thus, it is important to perform comparative analysis of various fans available before buying.
There are a plethora of ceiling fans available in the market today. From decades ago till today, fans have come a long way in their technology and design. All these factors and many more have been optimised to provide for better air delivery and power usage. The aesthetics of wing design and weight of the main body has a major bearing on the main factors used to compare ceiling fans- safety, average power consumption and air delivery rates.
The BIS standard marks fans by rating them on parameters of performance. It has set certain guidelines which ideally need to be followed by ceiling fan manufacturers but since it is not mandatory for industries to abide by them most of the ceiling fans available in the Indian market today do not meet the requirements set by BIS. Even the two most important parameters of input power and service value were not complied with.
Service value is an important parameter derived to make comparison of working of fans easier. The service value of a fan is determined by calculating the rate of air delivery of fan(meter cubed/minute) and dividing it by the amount of power consumed(watt). Thus, this parameter is more or less a measure of efficiency of the ceiling fan in use.
Factors affecting air delivery
The most important factor affecting air delivery by fans is wing size. The most widely sold fans in India fall under the 1200mm category due to them being light on the pockets. However, the 1400m (56″) has better air delivery output but draws on more power. Thus, there is a trade-off which must be exacted in order to ensure the best performance characteristics. These fans are also more effective when it comes to rooms having large sizes (more than 100 sq ft).
Research has proven that factors such as RPM(revolution per minute) have not much of a bearing when it comes to ensuring a higher air delivery value. Rather, better air delivery is ensured by optimising the blade design and an appropriate angle of cutting the air. Low RPM fans can have better performance outputs than high RPM fans due to their optimum design characteristics. Buy best cooling fans online with latest technology.
Fans have evolved much in terms of power consumption, air delivery and safety parameters over the past decades. Ceiling fans used to be quite heavy(of the order of upto 10kg) in earlier days but now their weight has been reduced to about 3kg. The fans used to be power efficient but their RPM would be quite low. Fans of today have achieved better RPM values but this has come at the cost of higher input power.
Better aerodynamic designing of fans has been achieved which has much improved the air delivery rates. However, service value of most fans being sold in India remains at lower levels given their high power consumption. This has the potential to be corrected and in all probability fans of tomorrow would have much better service value.