You've probably seen on the weatherization section devices of mobile air conditioning, but without the rear pipe and much cheaper, actually comes to portable evaporative coolers. This type of equipment is often sold as "air conditioning", and although their function is the same, cool, its operation could not be more different.
Evaporative Cooler
The principle on which they are based is quite simple, mainly consisting of a fan and an element that allows water to evaporate when placed against the airflow. Thus an adiabatic evaporation (no net exchange of heat), so that the result is an air blast cooler and wetter the environment occurs. The operating principle is the same for the works a jug or so we refresh the abanicarnos when we sweat.
Let's see how a little further: Using a psychrometric chart you can calculate how air temperature changes if we increase the relative humidity adiabatically. But also want to know the temperature felt as though the air gets colder, wetter as it will cost more work to evaporate sweat, feeling more warm feeling. We will use a table of thermal sensations. Take a couple of examples: very dry and hot air (40 to 20%) and muggy air (30 and 70%). These data are the maximum heat of my locality (Malaga) last year. Suppose that the unit has enough power to increase the relative humidity to 90%, not stronger because we do not want to breed fungi.
Then we see in the case of dry air, we can vary the wind chill 16 degrees before they begin to wet the walls. As the recommended health relative humidity is between 40% and 60%, if the pileup graduated so that it stays in 60%, yet we achieved a significant decrease from 11.5 degrees.
Evaporative Cooler Scheme
However, in the second case of moist air (embarrassing), the advantage is only 4 degrees and even improves, the end result is not a pleasant temperature.
We are used to seal up the windows when we put an air conditioning to the cold can not escape. But what if we closed the windows using an evaporative cooler? At first obtain the temperature drop from the table, but once reached the maximum humidity, the unit will not cool anymore. The heat from the outside will enter through walls and windows (closed) and heating the indoor air is also saturated with moisture, so that while the apparatus is still on not be able to evaporate more water or cooling; end inside the sweltering heat will be more than outside. So if you are going to use an evaporative air conditioner inside, it is imperative to renew the air, which means that we achieve the temperature inside will report directly to the outside air temperature.
Portable Evaporative Cooler
It may be that a day of sweltering heat (70% moisture) have 27ºC in the interior of the house because something Fresco keep dawn- and 30 abroad. In this case, when put to work the evaporative cooler, we would achieve a wind chill of 31 ° C, whereas before starting operation, the temperature felt like 29 ° C. The result is worse than if you simply closed the windows and shutters a little longer.
"Well the device only works well dry days and sometimes it's better not light it," you can think of. "Much better air conditioning". Yes, what we're going to cheat. But there is one small thing to consider: the energy consumption and cost. A portable air conditioner for a small room has an average consumption of 1 kW, while a portable evaporative cooler for the same room consumes 140W and a glass of tap water. I will not make detailed accounts, but for two teams that cool the same, the evaporative cooler uses five times less electricity. A portable air conditioner is around 500 euros, while a similarly evaporative cooler out for 200 euros. Do not use refrigerant gases can be used both indoors and outdoors and do not need the cumbersome tube / s air exchange with the outside using the portable air conditioning equipment.
Finally, if you you urge to use one of these evaporative coolers, make sure that your computer is powerful enough to the surface to be cooled, the 60W, which is the most common, it is insufficient to "cool" a living room for example . It is also very convenient to clean and disinfect frequently the water tank to avoid possible health problems.
Evaporative Cooler
The principle on which they are based is quite simple, mainly consisting of a fan and an element that allows water to evaporate when placed against the airflow. Thus an adiabatic evaporation (no net exchange of heat), so that the result is an air blast cooler and wetter the environment occurs. The operating principle is the same for the works a jug or so we refresh the abanicarnos when we sweat.
Let's see how a little further: Using a psychrometric chart you can calculate how air temperature changes if we increase the relative humidity adiabatically. But also want to know the temperature felt as though the air gets colder, wetter as it will cost more work to evaporate sweat, feeling more warm feeling. We will use a table of thermal sensations. Take a couple of examples: very dry and hot air (40 to 20%) and muggy air (30 and 70%). These data are the maximum heat of my locality (Malaga) last year. Suppose that the unit has enough power to increase the relative humidity to 90%, not stronger because we do not want to breed fungi.
Then we see in the case of dry air, we can vary the wind chill 16 degrees before they begin to wet the walls. As the recommended health relative humidity is between 40% and 60%, if the pileup graduated so that it stays in 60%, yet we achieved a significant decrease from 11.5 degrees.
Evaporative Cooler Scheme
However, in the second case of moist air (embarrassing), the advantage is only 4 degrees and even improves, the end result is not a pleasant temperature.
We are used to seal up the windows when we put an air conditioning to the cold can not escape. But what if we closed the windows using an evaporative cooler? At first obtain the temperature drop from the table, but once reached the maximum humidity, the unit will not cool anymore. The heat from the outside will enter through walls and windows (closed) and heating the indoor air is also saturated with moisture, so that while the apparatus is still on not be able to evaporate more water or cooling; end inside the sweltering heat will be more than outside. So if you are going to use an evaporative air conditioner inside, it is imperative to renew the air, which means that we achieve the temperature inside will report directly to the outside air temperature.
Portable Evaporative Cooler
It may be that a day of sweltering heat (70% moisture) have 27ºC in the interior of the house because something Fresco keep dawn- and 30 abroad. In this case, when put to work the evaporative cooler, we would achieve a wind chill of 31 ° C, whereas before starting operation, the temperature felt like 29 ° C. The result is worse than if you simply closed the windows and shutters a little longer.
"Well the device only works well dry days and sometimes it's better not light it," you can think of. "Much better air conditioning". Yes, what we're going to cheat. But there is one small thing to consider: the energy consumption and cost. A portable air conditioner for a small room has an average consumption of 1 kW, while a portable evaporative cooler for the same room consumes 140W and a glass of tap water. I will not make detailed accounts, but for two teams that cool the same, the evaporative cooler uses five times less electricity. A portable air conditioner is around 500 euros, while a similarly evaporative cooler out for 200 euros. Do not use refrigerant gases can be used both indoors and outdoors and do not need the cumbersome tube / s air exchange with the outside using the portable air conditioning equipment.
Finally, if you you urge to use one of these evaporative coolers, make sure that your computer is powerful enough to the surface to be cooled, the 60W, which is the most common, it is insufficient to "cool" a living room for example . It is also very convenient to clean and disinfect frequently the water tank to avoid possible health problems.