Cooling of Projector Light Bulbs Using Tubexial AC & DC Fans & Blowers and Affect on Life Expectancy
Breakthroughs Media
July 28, 2010
More info click here: www.ustoyofan.com
Its common practice for Product Design Engineers to utilize cooling devices such as AC and DC tubeaxial fans and blowers to limit the temperature rise of high wattage light bulbs used in projection equipment. Much consideration is given to the selection of the cooling device to be used as the cooler the bulb is kept the longer its life will be. However, at times, not enough consideration is given to the placement of the cooling device, which can greatly affect its life expectancy. The fan or blower is commonly positioned to draw cool air into the equipment and force it directly at the hot bulb, effectively cooling it by convective and conductive means. But the bulb is also emitting radiated energy, an important factor that should not be ignored. All non-reflective surfaces in direct line of sight with the bulb will receive this radiated energy and become heated. Since the housings of most cooling devices are usually dull black plastic or painted aluminum they are unfortunately ideal conductors of this radiated energy. AC and DC fans and blowers that are within direct line of sight with the bulb will receive this radiated energy and can easily become heated to a point where their life expectancies are greatly reduced… either because of degradation of the lubricants used in their bearings or damage to the components of their motors, especially if they are electronically commutated DC type devices.
To avoid this damaging heating affect the fan or blower should be placed such that it delivers its cooling air in an indirect path towards the bulb. This involves the use of baffles or ducting and, correspondingly, the use of cooling devices which can deliver the necessary velocity or volume of air through this more restrictive airflow path. A large selection of such high performance AC and DC fans and blowers as well as technical assistance are available from the U.S. Toyo Fan Corporation located in San Gabriel, California. Visit www.ustoyofan.com for further information.
www.ustoyofan.com
Its common practice for Product Design Engineers to utilize cooling devices such as AC and DC tubeaxial fans and blowers to limit the temperature rise of high wattage light bulbs used in projection equipment. Much consideration is given to the selection of the cooling device to be used as the cooler the bulb is kept the longer its life will be. However, at times, not enough consideration is given to the placement of the cooling device, which can greatly affect its life expectancy. The fan or blower is commonly positioned to draw cool air into the equipment and force it directly at the hot bulb, effectively cooling it by convective and conductive means. But the bulb is also emitting radiated energy, an important factor that should not be ignored. All non-reflective surfaces in direct line of sight with the bulb will receive this radiated energy and become heated. Since the housings of most cooling devices are usually dull black plastic or painted aluminum they are unfortunately ideal conductors of this radiated energy. AC and DC fans and blowers that are within direct line of sight with the bulb will receive this radiated energy and can easily become heated to a point where their life expectancies are greatly reduced… either because of degradation of the lubricants used in their bearings or damage to the components of their motors, especially if they are electronically commutated DC type devices.
To avoid this damaging heating affect the fan or blower should be placed such that it delivers its cooling air in an indirect path towards the bulb. This involves the use of baffles or ducting and, correspondingly, the use of cooling devices which can deliver the necessary velocity or volume of air through this more restrictive airflow path. A large selection of such high performance AC and DC fans and blowers as well as technical assistance are available from the U.S. Toyo Fan Corporation located in San Gabriel, California. Visit www.ustoyofan.com for further information.
www.ustoyofan.com
Print
Email
