Hi,
I live in Thailand, no RV, DIY straw bale home
Last year we had + 45 degrees in the shade...
This year I have airconditioning installed in the battery room!
(Big house and small farm use a lot more energy then RV, 16x 200Ah deep-cycle is an investment worth protecting)
(A straw bale house ain't happy about a 24/7 moist room... The fungus will thank you. Sadly no direct hydro cooling in my battery room)
Good thing that the heat is there when the sun shines, and my solar panels love the sun, make more energy then the airconditioner need.
I have had a lot of experience with evaporation cooling.
When I lived in The Netherlands, I had "small"mining farm (+200 high end GPU) (crypto currency)
That used 18kw 24/7. and most of it is heat!!
Computers don't like open air, mostly during rain they tend to have issues....
besides.. $100.000 electronics out in the open.......
I used a closed space and 5 times a 60x60x15 cm hydro pad.
One suction ventilator (2000m3/h) to make the room "vacuum".
The 5 hydro pads where in front of the the air inlet, air going inside the room was cooled and moist (98-100%).
2 benefits:
1: more cool. 2: moist air can contain more energy / heat.
Total power consumption to cool 18 kw, under 1 kw
(normal datacenter would use 4 á 5 kw to cool via air-conditioning)
Holland (The Netherlands) is wet, moist (sea) climate. we often have high moist..
During the 100% (rainy) days, temperature is lower.
My experience is that even with 80 and 90% moist in the air, the hydro cooling still works quite good!
When the temperature is 30 degrees and moist, it still gets it down to -27 degrees.
when the temperature rises (e.g.35 - 40 degree) , the moist in the outside air will reduce,the cooling pads can get the temperature still easy till 27, sometimes lower.
hydro cooling / swamp cooling works perfect, also in moist climates.
it ain't airconditioning!! you cant expect it to go down to 20 degrees when it is HOT outside.
27 degrees is realistic cooling temperature, but it feels BAD !!
(while it is more cool, it is also 100%, your body can't lose body heat via sweat, and thrust me... you will sweat a lot)
You also need to consider moist issues (fungus)
If you like to have it cool, and energy efficient, best to make a combination.
Pre-cool the "outside air" with hydro (pads or mist/small water drops) for the airconditioning.
The air conditioner uses +/- 30% less power and is a lot more efficient.
the air entering the outside unit of the airconditioner is
1: more cool. 2: moist air can contain more energy / heat.
It is an "old" technique, often used to boost life in to an old, no longer good cooling air conditioner to get you to the summer...
( I leaned about it from USA forum)
For me in Thailand, I use mist spray.
My normal water pressure is enough for the 0.1 and 0.2 mm nozzles.
much more easy to install then the hydro pads!!
It does also make the surrounding area of the outside unit little more moist, but that's OK.
(not all the water vapor is sucked into the airconditioner unit)
I hope this information about hydro cooling helps!
Peltier elements are fun to play with, they are good to cool your beer.
1 or 2 bottles.
The biggest problem with Peltier is their low efficiency / power consumption.
If 10 W is to be cooled, the Peltier element must have an power of 50 W.
it works easy, cool on 1 side, hot on the other. as long as you remove the heat and cold (ventilator) it can cool (or heat)
Cheap and simple!
Beer does not generate heat.... that's why you can keep it cool with Peltier
Batteries are different.
During charging they generate heat.
To cool 100 W,
For airconditioning you need 30 watt
For Peltier you need
500 Watt