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Peltier junction

S

Skenny

Jan 1, 1970
0
How effective are peltier junctions?
Would it be possible to attach one to an aluminum plate, place it in the
dog's house and keep him cool in 90 and above weather?
 
A

Andrew Gabriel

Jan 1, 1970
0
How effective are peltier junctions?
Would it be possible to attach one to an aluminum plate, place it in the
dog's house and keep him cool in 90 and above weather?

Probably not powerful enough. The standard 40mm square one used
in food coolers/warmers pumps about 50-60W depending on supply
voltage. It consumes about the same power as it pumps, making
it much less efficient than a fridge or aircon heat pump.
 
S

Skenny

Jan 1, 1970
0
Thats what I was thinking too.
Does anyone have any ideas about cooling dog (or pet's) house during hot
summer days?
I know this sounds like a joke, but Im serious.
A small AC unit would probably work, but I was thinking it would work too
good, since it would be cooling a very small space. Also, pet hair would
tend to stop up the filter and evaporator fins.
 
N

no_one

Jan 1, 1970
0
how about attaching Peltier cooler directly to Dog's primary heat exchanger
(i.e. tongue)? Tie wrap or velcro seem like a good fit!

Just kidding
 
S

Skenny

Jan 1, 1970
0
My dog would chew it up. I think he could even destroy titanium steel..
LOL
 
K

krw

Jan 1, 1970
0
Thats what I was thinking too.
Does anyone have any ideas about cooling dog (or pet's) house during hot
summer days?

This is a *DUMB* idea.
I know this sounds like a joke, but Im serious.
Really?

A small AC unit would probably work, but I was thinking it would work too
good, since it would be cooling a very small space. Also, pet hair would
tend to stop up the filter and evaporator fins.

Peltiers are horribly inefficient and you have to dump the heat
somewhere (close). The poor dog shouldn't be left outside if it's
that hot.
 
B

Beachcomber

Jan 1, 1970
0
Peltiers are horribly inefficient and you have to dump the heat
somewhere (close). The poor dog shouldn't be left outside if it's
that hot.

An wall array of multiple Peltier junctions would work, but as stated
above would not be as electrically efficient as conventional
evaporator-compressor cooling. You would also need to find a source
of them at acceptable cost.

One advantage of Peltiers though is that they do not require the
starting amps that a hvac motor would need.

You could conceivably power them from a low voltage solar array (12 to
48 VDC) on top of the doghouse (It would have to be pretty big!).
Thus, the more sun on a hot day, the more power available for cooling.

From my own experiments with Peltier junctions, I've noticed that they
will produce a condensate (dirty water) dripping from the cooling
plate, just like a regular air conditioner. Take this into account
with your design.

Beachcomber
 
A

Andrew Gabriel

Jan 1, 1970
0
Thats what I was thinking too.
Does anyone have any ideas about cooling dog (or pet's) house during hot
summer days?
I know this sounds like a joke, but Im serious.
A small AC unit would probably work, but I was thinking it would work too
good, since it would be cooling a very small space. Also, pet hair would
tend to stop up the filter and evaporator fins.

Since dogs cool by evaporation from tongue, it's not clear to
me that just cooling the air will be as beneficial as it is
to humans. A dog's idea of comfort might be quiet different,
e.g. low humidity might be much more important.

Anyway, what about starting with an old but working fridge?
Take the door off and build out the front to whatever size
you need for the kennel. It would need to be very well insulated
and the entrance would need some type of draft barrier (but not
air-tight or you'll suffocate the pet). Protect the rear
condensor, compressor and electrical from rain, and make sure
you run the thing via a GFI. Thermostat will need changing to
one with a suitable range, e.g. 21C.
 
R

Rheilly Phoull

Jan 1, 1970
0
Skenny said:
How effective are peltier junctions?
Would it be possible to attach one to an aluminum plate, place it in
the dog's house and keep him cool in 90 and above weather?

Forget the peltier's, how about an evaporation unit. You could make a frame
and cover it with sacking doubled over and rig a solar powered pump to keep
it wet. A simple sump with a ball valve for the supply.
 
S

Skenny

Jan 1, 1970
0
Arent evaprative coolers less effiecent in high humidity?
I know we tried at our plant using evaporative coolers, they were big bulky
fans blowing through a paper type media that was wetted by a pump from a
sump at the bottom. It had to be attached to a water supply to keep the sump
filled. They didnt work too good though, and after some research (from us
maintenenace people), we found that the humidity level in our area of the
globe made the coolers almost not work at all.
The machine operators complained about them not working, so now they are
setting in our way at our maintenance shop. (unplugged and pushed in a
corner.)
This also goes back to one poster's comment about a dog not sweating, but
using his tounge to cool. So maybe humidity wouldnt be a factor? Or maybe
the condensation inside the dog house would be.
I think that it is an engineer's passion to make things work, and for the
sake of discussion (such as this newsgroup), any idea, no matter how stupid
it may sound, is playground material for an engineer.
 
R

Rheilly Phoull

Jan 1, 1970
0
Skenny said:
Arent evaprative coolers less effiecent in high humidity?
I know we tried at our plant using evaporative coolers, they were big
bulky fans blowing through a paper type media that was wetted by a pump
from a sump at the bottom. It had to be attached to a water supply to keep
the sump filled. They didnt work too good though, and after some
research (from us maintenenace people), we found that the humidity
level in our area of the globe made the coolers almost not work at all.
The machine operators complained about them not working, so now they
are setting in our way at our maintenance shop. (unplugged and pushed in a
corner.)
This also goes back to one poster's comment about a dog not sweating,
but using his tounge to cool. So maybe humidity wouldnt be a factor? Or
maybe the condensation inside the dog house would be.
I think that it is an engineer's passion to make things work, and for
the sake of discussion (such as this newsgroup), any idea, no matter how
stupid it may sound, is playground material for an engineer.

Yup, sure are but it would improve things for the dog I imagine.
That and some good insulation with low velocity high volume air transfer.
Perhaps on consideration make a very well insulated kennel under a shade
roof with the air treatment plant detached ?
 
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