Evaporative cooler
Wind, water, evaporizér!
Do you know the pleasant coolness in the summer wet t-shirt and a wind? The water from the t-shirts evaporates and you just have felt the effect of an evaporative cooler. The device uses this principle to a cooling of the air in the rooms.
To evaporate the water, changing the physical state of water from kapaliného on the gas, it is necessary to supply water to a large amount of thermal energy. So, if offers the warm air we put in their way, for example, damp air permeable mat, comes to the absorption of thermal energy of the air to evaporate water from the wet mats. Air for mats is already on the thermal enegrii a disservice, therefore, it is cooler.
The idea that the cool water absorbs heat from the air, is a misconception. The water would be for some time heated and cooling would be the end. But us, the water evaporates, evaporuje, so wanes.
Principle
Warm outside air is násávaný into the restricted area of the cooler, where in its path through the air permeable mat with the ability to retain water. The mat is not from the liquid-absorbing wood material, which is a fungus in the bathroom, or on the dishes (this is in navhlčeném state of the air impermeable). Meet more with different synthetic filter materials (interesting materials you can find in akvaristických needs). Subsequently, the cooled air foukaný into the room, which cools. It is understood that part of the radiator must be a fan that will ensure the airflow through the radiator. Here attention to the fans that do not have the proper coverage against the water I'm sure I saw at least IP x5.
Because the evaporation of water from the mats, it is necessary to maintain the mat constantly moist. This ensures the reservoir above the mats with small holes for airborne wetting. Under the mat is then affixed the holding tank, which captures the water, what didn't go through the process of evaporation. And only the pump for pumping water between the receptacles. The downside dvounádržového system I need to watch the levels in the two tanks, or put up with any přetékáním the top of the tank. But the performance of each pump is changed in time and it might bring unnecessary trouble. It therefore offers a place in each tank level float and with their help, switch the pump.
The solution, when it is the only reservoir on the bottom and the pump only draws water into the airborne irrigation, seems easier and uhlídatelnější. I've also seen a solution from absorbing artificial fabric, partially submerged in the tank with water. Do you know of samozavlažovacích pots. For the experiments is good, that this material can normally buy in gardening. I'm a little concerned that the capillary action of water textiles will be slower than evaporation, so at the moment it dries.
Must not miss the replenishment of water. Either rely on manual adding. Here it is necessary to ensure, for example, float off the pump to the pump to burn yourself. Or some of that automation and connection of the reservoir to the pressure the water and the water make use of the toilet and another float.
Improvements
Prior to admission to a cooler place the air filter. Protect mats and fan from silting dirt and cleans the air foukaný into the room.
If you want the device to operate completely without external energy supply, offer to supply photovoltaic panels and fan, also the pump. A small backup battery will ensure the delivery in the shadow of the Sun.
The activity of the circulation pump, which draws water from the lower reservoir above the mat, it is possible to automate the use of a moisture sensor with relay outputs. The question for research is whether the humidity sensor put to the mat, or into the space cooler.
This may look like a combination of evaporative coolers with another passive device – a solar chimney.
Pros
- low power consumption el. energy (as opposed to the air conditioning definitely fold lower)
- at the same time, humidifier
Risks and limitations
- a relatively smaller reduction in temperature than the air conditioning. (I'm sure you don't get to 18°C at 35°C outdoor)
- clogging of air filter, required regular inspection
Usage
The device can be bought as a finished product with professional installation. Many manufacturers have a prepare for snadnémuu connection to the existing ventilation duct. With us are far more common devices for industrial plants and office buildings. Abroad can purchase a small home unit.
Home-made, it's a cheap solution cooling on hot days with a pleasant bonus of increasing the humidity in the room. Some diy ideas are really drawn. I literally was definitely interested to the following:
