General purification plants, especially those used in electronic industry, have strict requirements for constant temperature and humidity. They not only have strict requirements for temperature and humidity in the plant, but also have strict requirements for the fluctuation range of temperature and relative humidity. Therefore, in the air treatment of air purification and air conditioning system, corresponding measures should be taken, such as cooling and dehumidifying in summer (because the outdoor air in summer is high temperature and humidity), heating and humidifying in winter (because the outdoor air in winter is cold and dry).
For the humidification problem of clean air conditioning system, there are many humidification methods, such as watering, wet film, high pressure spray and ultrasonic water humidification. These humidifying methods are equal enthalpy humidification process. Steam spraying, dry steam spraying and electrodes (electrothermal) humidification are spraying steam into air-conditioning supply air, and the humidification method is isothermal humidification process.
In order to ensure the accuracy of relative humidity in the clean plant, the water humidifying method such as spray water, high pressure spray and wet film has low accuracy, so it is best not to use the relative humidity accuracy within the clean workshop to be less than or equal to 10%. The method of spraying dry steam and electrothermal (electrode) humidification is adopted. The humidification method of spraying dry steam should pay attention to the efficiency of spraying steam in the dry steam humidifier. It is not that all the steam injected into the air conditioning box is added into the air conditioning supply air, and some of them are discharged as condensate water. Therefore, the efficiency of steam injection should be considered when choosing the humidification amount of dry steam humidification. Some manufacturers give a steam injection efficiency of 70%.
According to years of experience, different humidifiers have different applications.
For example, the humidifier, such as water spray, wet film and high pressure spray, is characterized by large humidification and low investment cost, while the relative humidity control accuracy is poor. Therefore, it is mostly used for the relative humidity requirement is not strict (> 10%). The humidifying system of the industrial workshop and the general comfortable air-conditioned room is humidified.
However, dry steam humidification and electrode (electrothermal) humidification with high relative humidity control precision are mostly used in air conditioning system humidification of clean workshop with strict requirement of relative humidity accuracy.
For bio-clean rooms with microorganisms as control objects (e.g. biopharmaceuticals, clean operating rooms, biosafety laboratories, experimental aseptic animal feeding rooms, etc.), the key point is to control the production and transmission of microorganisms, because humidity and moisture are the conditions for microorganisms to grow and reproduce, so the wetted water, wet film, etc. High pressure spray and other methods can not be used in biological cleanroom, only dry steam humidification and electrode (electrothermal) type humidification.
Another noteworthy problem is that in recent years, the relative humidity of outdoor air in South China, such as Shenzhen, Guangzhou, Shanghai and Suzhou in East China, is lower than the calculated relative humidity of outdoor air conditioning given by the "code". For example, the calculated relative humidity of outdoor air conditioning in winter is 70% in Shenzhen and Guangzhou, and 75% in Shanghai and Suzhou. However, the measured outdoor relative humidity in these years is sometimes only about 30%. Therefore, the humidification capacity of the clean workshop built and operated is insufficient, and the indoor relative humidity is low, which can not meet the design requirements. Some factories add moisture film or spray to the original air conditioner for the sake of convenience and saving money to add humidification. However, contrary to our wishes, not only can we not add moisture, but also saturated water will soon become condensate, which can not achieve the purpose of humidification. Because the wet film and high-pressure spray are equal enthalpy humidification process, the air conditioning before humidification must be heated to a certain temperature before humidifying. It is not feasible without heating.
Another problem that should be paid attention to in humidification is the problem of air flow carrying water in air conditioner. In some projects, the problem of carrying water in humidification has not been properly handled. As a result, the medium-efficiency filter and even the high-efficiency filter behind have been wetted by the water carried. For dry steam humidifier, attention should also be paid to the slope and slope of steam pipe and condensate pipe, so that condensate water can be quickly discharged outside the air conditioner. If the humidifier is located in the fan section of the air conditioner, measures should also be taken to avoid condensation water dropping on the motor, resulting in short circuit power failure of the motor.
Shandong Aide Purification Engineering Co., Ltd. has strong technical strength and construction experience, according to the different needs of clean places, using professional equipment, to form different levels of clean standard space, to create the most suitable production and working environment. At present, it has established close cooperation with many enterprises and is a trustworthy professional purifying project implementer. To learn more about the medical purification industry, please pay attention to the Wechat Public No. Aide-188 (Ed Purification and Oxygen Supply)