Not So Swampy Cooler

A "swamp cooler" or mister cools hot dry air by evaporating water. Instead of 105 F at 10% r. humidity you get something like 75F at 80% r. h. A S. C. consistes of a 1 m^3 cube containing a centrifugal blower sucking in air through a 1 m^2 damp mat made from a wood product. The mat looks like loosely packed angel hair pasta.

Both the r.h. and/or the temp could be lowered even further with a heat exchanger and another swamp cooler. The humid cool air leaving one swamp cooler could pre cool another stream of hot dry air before it entered a second swamp cooler.

Neglecting inefficiencies, if enough stages were added, you could chill down to the dew point, quite low at 10% r.h.

Bret Cahill

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Bret Cahill
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Dear Bret Cahill:

And smells *great*... for about a day.

Probably only to the "wet bulb temperature".

Don't know if you've see such things as these: URL:

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David A. Smith

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N:dlzc D:aol T:com (dlzc)

A "swamp cooler" or mister cools hot dry air by evaporating water. Instead of 105 F at 10% r. humidity you get something like 75F at 80% r. h. A S. C. consistes of a 1 m^3 cube containing a centrifugal blower sucking in air through a 1 m^2 damp mat made from a wood product. The mat looks like loosely packed angel hair pasta.

< And smells *great*... for about a day.

That's the reason for the heat exchanger: to keep the cool and eliminate the moisture.

Both the r.h. and/or the temp could be lowered even further with a heat exchanger and another swamp cooler. The humid cool air leaving one swamp cooler could pre cool another stream of hot dry air before it entered a second swamp cooler.

Neglecting inefficiencies, if enough stages were added, you could chill down to the dew point, quite low at 10% r.h.

< Probably only to the "wet bulb temperature".

At the original enthalpy. The first step stays on the wet bulb line until ideally you get to 100% humidity. Since you added water the new dew pt. will be considerably higher than the dew pt of the original dry air.

This is why 2 or more stages may be necessary.

In the 2nd step the heat exchanger cools a second stream of hot dry air with the humid cool air, and, since no water is added or lost from either stream both streams at a const. wt. % H2O.

The hot humid stream is exhaused.

The cool air at the original dew point can either be used as is or it can be run through another swamp cooler for still cooler but more humid air.

An air conditioner in series could eliminate the heat exchanger in a mixed system, i. e., a swamp cooler could save on ac power costs.

I think this is common in larger buildings.

Bret Cahill

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Bret Cahill

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