Cool towers use gravity to move cool air without any fans, although fans may be used to reduce the size of the towers. The most common cool towers do this by having a wet pad medium in the top of the tower. Since cool air is heavier than warm air, it will fall, creating its own airflow. Wind is not required, but will improve the airflow in a cool tower.
Generally cool towers without fans are from 20 to 30 feet tall and between 6 and 10 feet square (6'x 6', to 10' x 10'). Typically cool towers of this size will require from 10 to 150 watts, and will cool 1,000 to 2,500 square feet. Airflow for these cool towers will range from 2,500 to 8,000 CFM (cubic ft. per minute).
Passive ventilation systems rely on the movement of air through buildings to equalize pressure. The pressure difference can be caused by Wind or the Buoyancy effect created by stratified warm air. In either case, the amount of ventilation will depend critically on the size and placement of openings in the building.
Your tower should be a minimum of 6 ft. x 6ft. square and 25 ft. in height, most are about 30 ft. tall. Your tower should be insulated with at least an R-10 Factor, but R-19 or higher would be better.
Where prevailing breezes are not dependable enough to rely on wind-induced ventilation and where keeping indoor temperature sufficiently lower than outdoor temperature to induce buoyant flow is a problem, then a solar chimney may be an effective solution. The chimney is isolated from the occupied space and can be heated as much as possible by the sun or other means. Hot air is simply exhausted out the top of the chimney creating a suction at the bottom which is used to extract indoor air.
A large solar chimney can be used to exhaust the air from your home, but a downwind swiveling exhaust scoop is a better alternative. The more exhaust scoops you have the better. These enhancements will increase the air flow; using upwind and downwind scoops that swivel to orient the wind is the best choice.
If using wind, your cooler pads will be at the top or inside of the tower, depending on the design. Just below the cooler pads you should have a tank containing 15-30 gallons of water with a float valve assembly to keep the tank full. Locate outside the tank a small 12 Volt pump. It is best to use a non submergible pump.
Evaporating water is what creates the cooling and makes evaporative coolers and cool towers work. Rain water is the perfect source for the water used in cool towers because it does not have dissolved salts or minerals. Well water can contain dissolved minerals. As the water evaporates from the cooler pads, whatever minerals it contains are left behind. This buildup can eventually clog the pads and block air flow.
Looking for a fast and fair company to work with for your Heating and Cooling repair or replacement needs? Give Aaron’s Mechanical Services a call and let us help you get cooled off! Call us at: 623-388-4436
Presented by;
Aaron’s Mechanical Service
623-388-4436
info@aaronsmechanicalservice.com
http://aaronsmechanicalservice.com
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