My comment below is so clouded by time that it may be worthless, BUT
When air conditioning arrived (in the 30s, 40s?) it was a trade-marked
innovation, driving all the competition under because it /conditioned/
the air, not just chilled it. It combined air cooling with
dehumidifying, with greater comfort the result. If some current air
conditioners don't dehumidify enough, well, poo on them... The trade
mark got broken by indiscriminant usage, I suppose.
Ol' Bab, who was an engineer.
On 7/27/2016 2:08 PM, Stephen A. Lawrence wrote:
I'd have to guess you live in an area that isn't very humid. Otherwise
you wouldn't have to ask. :-)
First, the books on the bookcases in the livingroom stop growing mold
on their spines if you drop the humidity. (Otherwise, here in the
Ottawa River Valley, they sure do, just sitting there during the summer.)
Second, you stop feeling constantly sticky.
Third, if you're hot (like, you exercise or something) instead of just
getting soaked with sweat which refuses to evaporate, you actually
cool off a bit.
An aside: Many years ago, back in college, I repainted apartments as
a summer job. With the air conditioner running, the paint wouldn't
dry (or wouldn't dry before we left, anyway). To get it to dry fast
enough to allow us to do touchups and whatnot before we left, we
consistently had to shut the AC off. (So much for an AC drying things
out.) Which leads to our next point:
Used in conjunction with a conventional airconditioner a dehumidifier
can make things "feel" much more pleasant. Make no mistake --
conventional air conditioners reduce the *absolute* humidity
substantially but their impact on the *relative* humidity (which is
what makes everything feel sticky) is considerably smaller, as they
reduce the temperature of the air at the same time they remove
moisture from it. Their impact on the *relative* humidity is only as
large as the difference between the internal temperature of the air
(as it comes off the evaporator coils) and the final temperature of
the air in the room (after it mixes with uncooled air).
Some air conditioners may not cool the air significantly below the
target temperature, in which case the relative humidity may actually
be raised as a result of their operation.
Dehumidifiers, OTOH, are designed to have a large temperature drop at
the evaporator before the air is warmed again by the condenser, and
they always reduce the relative humidity.
On 07/24/2016 01:59 PM, David Jonsson wrote:
Hi
How does dehumidifiers like this one work?
http://www.conrad.com/ce/en/product/1377991/Dehumidifier-20-m-0011-lh-White-Blue-renkforce-HD-68W
I assume that my personal experience of room temperature will
decrease if I run one (provided I have sufficiently high humidity).
But I also realize that the temperature of the air rises after being
dehumidified. What is the net subjective human effect?
David
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