| A swamp cooler, an earthen pot for cooling | | | | Condition affecting performance |
| drinking water, cooling tower, and human skin, | | | | There are no controls for temperature of |
| work on the same principle. The principle is | | | | outgoing air since it cannot just be controlled. It is |
| evaporative cooling. Water is broken down into | | | | a "take it or leave it" type of machine with |
| smaller droplets and air forced through it. Heat | | | | absolutely no control on the out let air |
| transfer takes place from water to air or air to | | | | temperature. The out let air temperature is the |
| water depending on the design of the equipment. | | | | result of atmospheric air temperature and |
| In human skin, the heat is taken away from the | | | | atmospheric humidity. The lesser the relative |
| body when sweat on surface of skin evaporates. | | | | humidity, the higher is the performance for a |
| Construction Of Swamp Coolers | | | | given inlet temperature. At the same relative |
| The swamp coolers consist of a box and a fan is | | | | humidity, higher inlet temperature increases the |
| situated inside the box. On the suction side of fan, | | | | cooling ratio. Therefore, you can see that the |
| there are pads. These pads are made of wood | | | | air-cooling cannot be controlled. If this is the case, |
| shavings or PVC. A small water pump directs | | | | why have a swamp cooler at all? The answer is, |
| water on top of the pads. The construction of | | | | air conditioning was invented about in1902 and |
| pads is such that the incoming water is broken | | | | there was no choice before it. Now it is a question |
| down into small water droplets and air going to | | | | of money. If you wish to have a low initial cost |
| suction of fan goes through these small droplets. | | | | and low operating cost solution, swamp cooler is |
| So in essence, it is just a box with a pump and a | | | | the only alternative. |
| fan & lot of pads for breaking water into | | | | How to choose your swamp cooler |
| smaller droplets. The construction might also | | | | The capacity of swamp coolers is on cubic feet |
| include a distributor for air delivery so that the air | | | | per minute (CFM) capacity of air delivery fan. If |
| is equally distributed in all areas of the room. | | | | the room dimensions are 15 feet by 12 feet and |
| Other variations include a common motor for | | | | 8 feet high, then room capacity will be 15*12*8 = |
| pump and fan, thus further reducing construction | | | | 1358 cu ft. The fans are designed to have |
| complexity | | | | complete change of room air every 5 minutes. |
| The controls of swamp coolers include controls | | | | This means that the capacity of fans will be 1358 |
| for fan speed, a float valve for maintaining water | | | | divide by 5, or approximately 280 CFM. This |
| level in the basin of cooler and controls for air | | | | capacity is for a fan that draws cold air from the |
| delivery. Some portable swamp coolers have | | | | room. If the same swamp cooler is fixed in a |
| water level indicators instead of float valve and | | | | window, the capacity will increase, as recirculation |
| water level has to be maintained by pouring | | | | will be reduced to zero. |
| water from outside. | | | | |