7. To determine the design CFM for an air handler serving several zones using a

Question

7. To determine the design CFM for an air handler serving several zones using a variable volume system a. one needs to determine the time that the maximum cooling load occurs for all the zones that the air handler serves and then use that value to calculate the CFM required. for a constant volume system handler, add these values to get a total cooling load, and then use the total b. It is done the same way that one selects the design cooling load c. One needs to determine the max cooling load for each zone served by the air cooling load to calculate the CFM d. None of the above answers

Explanation / Answer

Option C is correct.

Explanation is as bellow:

In VAV air handler you have to select the air handler at block load and size duck work for max cooling load of all vav boxes and also remember the fan you select air handler should be for peak load as well which total of all CFM of vav boxes at maximum cooling load...... Coil at air handler is the only thing that will be sized for block load as all vav boxes won't running at maximum load at given time.

Duckwork and fan sum of all maximum loads and coil at block load.

Block load will be slightly less then peak load

Peak load = sum of maximum CFM of vavs.

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