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Old 21st December 2015, 05:17 PM
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Tramcar Trev Tramcar Trev is offline
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Default Out door airconditioning

With summer on us and looking like its going to be very hot one here is a very practical idea to cool an outdoor area that can be made to fit even a caravan awning.

So what you need is knitted shade cloth (NOT the woven variety), some 13mm black "dripper hose" with corner fittings etc, a hole punch to make the holes for the drippers and some drippers, you will need a dripper around every 75mm for the length of the shade cloth curtain you will also need something to catch the water in at the bottom. For a permanent installation this can be plastic guttering that you would set into the ground, for a "portable" installation then PVC house guttering can be used and it is simply cut to size and laid on the ground. You will also need a pump to pump the water up to the drippers from the bottom gutter.
What you are about to create is a giant Coolgardie safe: http://collections.museumvictoria.com.au/articles/709

If you have ever been to Coolgardie you would realise just why this thing was a necessity. Even more interesting is how the EGTB managed to run trams in that heat… So even if you don’t build on of these you will have learned that indeed trams used to rumble along the streets of Kalgoorlie…

So to construct; now that you know the principle what you have to do is make up curtains of shade cloth to fit wherever you are going to use them, they need not hang vertically, the surface tension of the water will keep it from falling off the shade cloth up to around 45degrees. Then along the top you need to run your 13mm dripper hose. You can hold the lot in place with 13mm plastic hose clips nailed through the Shade cloth; use the available pvc fittings to go around corners etc and at the end either use a tube plug or bend the tube back on itself. For a portable installation you can sew a hem into the shade cloth and run the hose through the hem and hold the contrivance up using hooks or similar. You will need to pierce the tubing every 75mm or so and screw in a dripper, if the tube is inside a hem then the water will have no choice but to take the course of least resistance and dribble down the shade cloth. If this is a permanent job then the dripper line has to be outside and above the shade cloth so the water will run down the shade cloth.
The shade cloth has to end up at the bottom in a trough or drain, if you use the plastic storm drain material then plastic cable ties can be used to hold it in place, for a portable setup then run the shade cloth into the guttering and hold it in place with weights or even clothes pegs. Sit the pump in the bottom trough and connect the outlet to the dripper line; fill with water and switch on the pump. When the water starts to run down the shade cloth you will notice just how quickly things cool down inside your "enclosure". As the water evaporates you will need to top up or for a permanent job you could use a ball valve to control the water level. And YES you could use a solar pump.

You can make up a single caravan shade wall and equip it with a water feed and even that will give you very noticeable cooling even with the ends open…
Just how cold is this going to get? Depends on how quickly the water evaporates, these work most efficiently in hot dry conditions and not so efficiently in hot moist conditions. A temperature differential of around 10 - 15 degrees is not unreasonable to expect but what you will notice is that when a breeze filters through the shade cloth you will feel the effects just like a cool change at the beach….

This is a list on eBay just so you know what to look for;
http://www.ebay.com.au/itm/90-UV-Sha...sAAOxyhXRTMgMW

If you use this hose you don’t need drippers as the hose is porous and the water will "leak" out of it; http://www.ebay.com.au/itm/NEW-Neta-...QAAOSwofxUb4e8

Common garden hose can be used in conjunction with; http://www.ebay.com.au/itm/NEW-Neta-...QAAOSwofxUb4e8
and then insert these into the holes; http://www.ebay.com.au/itm/50x-Micro...cAAOSw~gRVp31g These are good because the flow rate can be adjusted and they can be opened up for cleaning…

http://www.ebay.com.au/itm/Pack-Of-1...0AAOSw1-RUZwny

http://www.ebay.com.au/itm/HAILEA-IN...eBAP2mv9kkH8kw
this pump has a filter to keep leaves and rubbish out of the dripper line.
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