Roots blower design pdf

Download our document for the full calculation Positive displacement Blower Calculations The heart of pneumatic conveying systems. Products Blowers Roots lobe blowers Postive displacement blower calcs. Blower calculations for pneumatic conveying systems A surprisingly wide variety of powders and granular material can be effectively moved from one location to another within the plant.

PD Blower System Design and Capacity Control Selecting the correct blower is the most important decision when designing a pneumatic conveying system.

Basic Pneumatic Conveying System Calculations Blower manufacturers do not routinely size pneumatic conveying systems, leaving that task to specialized design companies. Also when it comes time to divide, there is only one number left to divide by. This formula is often used when a change in motor pulleys is necessary in order to make a change in air flow cfm. This formula is first used as used in the example, to determine what the blower rpm is before any changes are made.

This eliminates the need for an actual rpm measurement on the blower pulley. Therefore, a tachometer is not necessary however; a tachometer is still useful to check that any changes made are accurate. Now that it has been determined that this example system has a blower rpm of , assume that an airflow measurement was taken or that the airflow in cfm is already known.

If it is not known there are several possible methods of determining the cfm. These methods are covered in the chapter on airflow measurement. Assume that this is a ton capacity system as stated by the manufacturer. Assume that an airflow measurement has determined that the system is moving cfm of air.

From the chapter on rules of thumb it was stated that for comfort air conditioning there should be cfm per ton. This is a ton system and should then have cfm.

The system is cfm short. A technician has looked for the obvious causes of low airflow. The evaporator air filter is clean, the evaporator coil is clean, the blower wheel is clean, the belt is not slipping and no obstructions are in the ductwork.

It has been decided that an airflow adjustment is required. The goal is to increase the cfm from cfm to cfm. Changing a pulley size or making an adjustment on the motor pulley if it is adjustable will accomplish this.

The most economical and practical pulley to replace is the motor pulley. The motor pulley is less costly, it is the easy one to change, and as the smaller of the two pulleys, it probably has the greatest wear on it. The smaller pulley will always wear the fastest as it is turning more revolutions per minute and it has a smaller circumference for the belt to spread the wear over.

New RPM The two existing pulley sizes are now known, the rpms of both of the existing pulleys are known, and the existing cfm is known. The new desired cfm for the system is also known. Now the missing information is; 1 What new blower rpm is required to obtain the new cfm? In this formula the 1 stands for what we have, and the 2 is for what we want. What we have is cfm with the blower speed of rpm. What we want is cfm, and are missing the new required rpm to go with the rpm.

So, the unknown information is question one above, what new blower rpm is required to obtain the cfm? Place the appropriate known values into the formula, crossmultiply and divide, and the answer are provided.

Cross multiply times to get 3,, then divide that by to get The blower rpm required to move cfm on this system is rpm. As will be explained fully later, more cfm than necessary may seem like a benefit however, this is a costly mistake in terms of both comfort control and operating cost. Correct airflow is always best, no more, no less. Now to answer the second question. What new motor pulley size is required to get the new blower rpm and cfm?

This is found by using the first formula again. This time the unknown to be solved for is the new motor pulley dia which is DIA a. Notice that the motor rpm is not changed. The change will be in the motor pulley size.

Cross multiply 16 times to get 18, then divide by to get the new motor pulley size of The existing 8" pulley may not be able to be adjusted to that new diameter, and a new fixed pulley of exactly Medical Gas Equipment.

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