Cooling Tower Fan Blade Angle Measurement

A t 25 t 250.

Cooling tower fan blade angle measurement.

Cooling tower fan blade angle measurement. Blades set at a 20 degree angle meet too much resistance which may cause the motor to burn out. Considered will be a 26 ft 28ft or 30 ft diameter fan. Try either a smaller motor sheave or larger fan sheave.

Houston texas fans key to optimum cooling tower design nomograph gives the reciprocal of the density ratio. Duty requirements are 1 1 million actual cfm 0 477 in. Blade angles performance of a small cooling tower. The method is easy tools required in this videos to measure and adjust the pitch angle of the cooling tower fan blades ar.

Blades that are set at a lower angle will slice the air but not create proper air circulation. The vibration levels at both motor fan speed are to be measured at the motor while the vibration levels at the blade pass frequency is to be measured at the fan shroud or stack. The pitch angle of 50 tonne unit was around 12 degree as per my observation. If the tower has a fixed pitch fan reduce the fan speed by adjusting the sheave ratio.

Made of aluminum alloy the blades are freely adjustable by the pitch angle scale of the fan hub. No overall vibration level standards are offered by cti. This paper is a brief case history of how cracked blades on a cooling tower fan were detected and a fan failure likely avoided by the use of vibration analysis. Generally the pitch angle of a cooling tower turbine is very from 6 degree to 15 degree depending on the operational speed and discharge.

B t 260 and above. Reduce fan blade pitch by 1 5 degrees and re measure. From 0 139 to 0 510 ipspk at one measurement point used for. Frequencies present at cooling towers.

Finally it was found that the cooling tower can operate under all the given approaches 5 c 6 c 7 c and 8 c at the blade angle of 67 by maintaining the cooling range of 5 c wet bulb temperature of 26 c and water flow rate of 3 9 m3 h. How to adjust it. Made of reinforced plastic material the blades are coupled to the fan hub by bolts and glue. Vibration sensors were properly installed on the gearbox driving the fan and the vibration levels routinely monitored.

What is cooling tower fan blade angle quora. First of all technically it is called the pitch angle of a turbine blade. The cooling tower blades move large volumes of air quietly and efficiently. Let s look at a typical case of fan selection for a new tower design.

For a ceiling fan to move the correct amount of air and achieve good circulation you should set the blades at a 14 degree angle.