Cooling a Workshop

If you wet somebody down and hit them with a breeze,, well that's the original air conditioner init...

...but not appropriate in every scenario...

The technology you are describing is already employed in many buildings, the machine is called a chiller. Cold water is circulated through aluminum pipes with fins, a fan blows air through the fins.

I don't see any images or second post from you.

In order for this to work, that freezer or its exhaust MUST be in an area different from the one to be cooled. The freezer works by pumping heat from inside its box to outside the box, and that heat is almost always exhausted to the air in the room/area where the freezer is located. For some freezers that use a fan to aid that exhaust, it may be possible to duct that heated air through a hole in the wall to the outside, but don't forget that any air exhausted from a room must be replaced with air from somewhere, so you really need two ducts, one for exhaust and another for replacement air. Hopefully the input to that replacement air duct would be placed a good distance from the exhaust air path, so it doesn't "inhale" heated air.

Yes it can lower the temperature but only if the humidity is low else there won't be enough dryness in the air for the water to evaporate, also you will raise the humidity of the workshop giving rise to a hot humid environment, not the best in which to work!

A swamp cooler is a very simple cooler that works by using a squirrel cage fan blowing air over a pan below it that is filled with water.

The amount of cooling depends on the relative humidity of the surrounding air.

This principle is commonly used in very dry places,like Arizona,USA,where a large building can be cooled for a few $$ a day.

The commercially made models are fairly expensive,but one can be made very cheaply,though not as efficiently as the commercial ones.

All that is required is :A pan of sufficient size equal to or greater than the discharge of the fan,and a squirrel cage fan with the air blowing over the water in the pan, directed as close as possible to the surface without blowing water out of the pan.Tiny droplets of water is good.The larger the pan and fan the better.Several units can be made to for large areas.

The pan could be fitted with a float switch to maintain the water level.A simple toilet tank float,properly adjusted, would suffice for this application.

Circulating cold water through tubing is not very effective,it will never get below the water temperature.

A swamp cooler will get below the incoming water temperature due to the latent heat of evaporation.

Commercial HVAC units use chilled water to condense the Freon,and it can be chilled far below 0 degrees C if necessary.They still use a very large form of evaporative cooling to get rid of the heat.

A simple sketch is below:

A Scot Brite or similar pad can be used as the evaporative pad,and a drip type irrigation orifice can be used to drip water on it from the top.

You will need a fine mesh filter for the feed water to prevent clogging of the orifices.

They are available with many different drip rates,more small ones is better than one large one to distribute the water at the top of the pad. in A fresh water supply can be used instead of a re-circulation pump.water pressure can be used to regulate the spray rate according to needs.

Here is a link to various types of sprayers.

https://images.search.yahoo.com/yhs/search;_ylt=AwrFDfuDv1Fm3f8vvT42nIlQ;_ylu=c2xrA3RleHQEaXQDQWxzb1RyeV9OBHNlYwNyZWwEcG9zAzE-?p=Micro+Irrigation+Sprinkler+Heads&fr2=p%3As%2Cv%3Ai%2Cm%3Ars-top%2Cct%3Abing%2Crgn%3Atop%2Cpos%3A1&fr=yhs-infospace-078&hsimp=yhs-078&hspart=infospace&type=ud-c-us--s-p-sbib6zsu--exp-none--subid-y7ysaw62#id=56&iurl=https%3A%2F%2Fbluediamondgrowers.com%2Fwp-content%2Fuploads%2F2020%2F05%2FMicro-Sprinkler-Irrigation-near-Modesto.jpg&action=click

This is really more complicated than necessary.A simple pan and float switch will work,although not as well.

Hope this helps.I have been in similar situations as you describe.

Good luck!

The minimum possible temperature that can be achieved by evaporative cooling of water is the wet-bulb temperature of the air into which the water is sprayed. At the 100% relative humidity that is achieved this way, though, water will condense out readily onto colder surfaces. Further, spraying water into air is fraught with elevated risks on account of any microbiology that exists within the water becoming airborne. The affliction known as legionella is quite high on the list of possibilities, especially in warmer climes. In order to protect against it, a robust regime of water treatment is required.

Persons operating in 100% relative humidity will suffer, as their bodies will be unable to lose heat by perspiration.

To go cooler than the local wet-bulb temperature, refrigeration is required, i.e. the introduction of an intermediate fluid in a closed circuit that operates close to its boiling and condensing conditions at the expected final temperatures. Water in the air will certainly condense on the surfaces it cools, such as the pipework and heat exchange apparatus so deployed, unless adequate insulation is used to protect from this.

These things are in the domain of the Air Conditioning Engineer. Make some calls.

There is currently under development a new super-white paint that reflects heat back into space,and can get up to 50F cooler than ambient temperature.A roof painted with this can save a lot of money and it requires no electricity.

There are many other reflective paints,but none as efficient as this new one.

Links below:

https://video.search.yahoo.com/yhs/search?fr=yhs-infospace-078&ei=UTF-8&hsimp=yhs-078&hspart=infospace&p=paint+that+is+coller+than+ambient+demonstation+video&type=ud-c-us--s-p-sbib6zsu--exp-none--subid-y7ysaw62#id=3&vid=3a5f59a0ff056e2576c0a1b4c4964955&action=click

https://www.thomasnet.com/insights/scientists-invent-superwhite-paint-that-reflects-heat-to-space/#:~:text=The%20superwhite%20paint%20developed%20by%20Xiulin%20Ruan%20and,to%2050%20%C2%B0F%20cooler%20than%20their%20ambient%20surroundings.

Here is a link to a very cheap centrifuge:

https://www.youtube.com/watch?v=isMYGtCFljc

You can make this paint yourself using info on previous links I provided.Let me know how it turns out.

Good luck in cooling off your heat stressed workers.