Customers who have used evaporative air cooler (also called “coolers”) report that the use of coolers will increase the air humidity of the place. But different industries have different requirements for humidity. For example, the textile industry, especially the cotton spinning and wool spinning industries, hopes that the air humidity is above 80% to ensure the good resilience of the fibers. Therefore, such enterprises will install various humidification equipment in the workshop. There are also flower planting and greenhouses that hope to have higher humidity. But some industries want the humidity to be lower, otherwise it will affect the quality of the product. Such as: packaging and printing, wood processing, precision machinery, electronics factory, food processing, etc. If the humidity in these industries is high, it will bring about the resurgence of products, rust and other problems. Does that mean that these companies are not suitable for using evaporative air cooler? Of course not, because through reasonable design, the humidity can be controlled within the range required by customers.

How is the humidity of evaporative air cooler generated? Let’s start with its cooling principle. The professional name of energy saving and environmental protection air conditioner is called ” evaporative air cooler”, commonly known as: cooling pad air cooler or air cooler. It is a product developed by the natural physical phenomenon that the evaporation area affects the evaporation efficiency by absorbing heat through water evaporation. When the hot air flows through the wet pad covered with water, the water on the wet pad surface evaporates, and the sensible heat in the air is taken away, thereby cooling the air. However, affected by the outdoor dry bulb temperature and wet bulb temperature, the moisture on the wet curtain cannot be completely evaporated in a very short period of time, that is, the evaporation efficiency cannot reach 100%, so a part of the moisture is brought into the room with the air. . And this part of the air with moisture will affect the indoor air humidity.

The traditional compressor-type air conditioner realizes the cooling of the place through the principle of neutralization, while the evaporative air cooler realizes the cooling through the principle of replacement. The size of the ventilation times directly affects the cooling effect and humidity index of the place. In short: the greater the number of air changes, the greater the cooling and the lower the humidity. Therefore, controlling the temperature and humidity should start with controlling the number of air changes. For example, a wool spinning mill needs to increase the humidity. By appropriately reducing the ventilation area, such as closing some doors and windows, the humidity can be rapidly accumulated in a short period of time to increase the on-site humidity. For places where humidity needs to be reduced, the ventilation area can be increased, such as opening as many doors and windows as possible, or by accelerating the flow of air by mechanical exhaust, so that the incoming humid air can be taken away before it can accumulate in the place, thereby reducing the Site humidity. It is also possible to reduce the number of startup units, or some work in the cooling mode and some work in the air supply mode.

It should be noted that the temperature and humidity of the air outlet of the evaporative air cooler are affected by the outdoor dry bulb temperature and wet bulb temperature, which are variables, and it is impossible to maintain a constant temperature and humidity. Therefore, although the influence of humidity can be minimized by increasing the number of air changes, there will be a certain increase compared to before the startup. For most industrial enterprises, there is no need to talk about wet discoloration, because usually the air humidity in rainy days is above 95%, and the indoor humidity is also above 85%. It is rarely heard that production is stopped due to high humidity in rainy days. enterprise. The ambient humidity can be completely controlled below 75% through the reasonable distribution and use of the cooling fan position or increasing the ventilation area. The temperature and humidity can achieve a relatively comfortable feeling.