beenthere

Hard to say if that would help a lot or not.

Although the coil is a pressure drop/resistance to air flow.
Would a 6" bypass configured like that move more then 100 CFM is the question.

The answer would be. Only if the coil was the only interference to air flow to the house.

As in. If you having trouble with the rooms on the end of the duct system. It wouldn't help. Since most of the extra air would be forced out the first supply runs. And very little would reach the far supplies.

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JohnH1

I am mostly thinking of this to make it easer to move the cfm. Why work harder all winter and use more energy forcing all the air through a coil. 6" is only a example it could be any size square or round as long as it could seal tight durring the summer. There is more winter than summer here. I dont know what the energy savings would add up to but it couldnt hurt.

A over sized plenum with a removable slide on the overhang would work also. Kinda like winter / summer dampers when the old seperate watercooled a/c packages were used in combination with the furnaces.

beenthere

A PSC motor uses less electric at higher static pressure then it does at lower static pressure. Because it is doing less work, since it is moving less air.

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beenthere

A 1 HP power motor under full load. In therory is moving 2481CFM. Ore, 33,000 pounds of air a minute.

Increase static pressure so that it is only moving 10,000 pounds of air a minute. And its only working as less then a 1/3 HP motor. And its amp draw will drop accordingly.

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JohnH1

Assuming we are able to move the correct cfm through the evap on high speed oridginalyl but now with the lower static it can be done on med-high. Wouldent that be a lower amprage?

On the other hand if we are now moving more air and drawing higher amprage. We would now be delivering more heat now that we are closer to designed cfm. This should make the overall operation more efficient shouldent it?

beenthere

If a blower moves more air on med high speed then on high speed. It is using more wattage at med high then at high speed. Since it is doing more work.

1,000 CFM with a 50 degree temp rise is 54,000 BTUs.
800 CFM at a 62.5 degree temp rise is 54,000 BTUs.
600 CFM at a 83.4 degree temp rise is 54,000 BTUs.

Its the combination of CFM and temp difference that determines BTUs delivered.

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