According to the purpose of humidification, it is roughly divided into two kinds:

1, comfort humidification

According to the statistical analysis of the international HVAC industry, human beings feel the most suitable and work most efficiently when living and working in an environment with a temperature of 22~26℃ and relative humidity of 40~65%RH. Dry air, will cause:

Dust in the air to greatly increase the degree of flying, will cause skin dry and cracked and itchy, make people feel uncomfortable, usually this environment is a variety of bacterial hotbeds will cause people to catch a cold, sore throat, and greatly increase the incidence of bronchitis, skin diseases, thus causing the sick leave rate rise indirectly affecting the production capacity.

2, process humidification

(1) electronic factories, photoelectricity, semiconductor factory

Humidification can be prevented because the relative humidity of the air is too low and produce static electricity phenomenon, this static electricity may lead to the production equipment when the machine and the product defective rate increases.

Electronic factories, optoelectronic, semiconductor factories are generally controlled at a constant temperature of about 22 ℃, so the need for year-round air conditioning and temperature and humidity control in order to prevent static electricity, condensation, corrosion, fibre rupture and staff discomfort. As the relative humidity is above 60%, there will be corrosion; and below 40% there will be static electricity. So usually parts in the clean room before entering, need to be maintained in a specific temperature and humidity environment, in order to prevent entry into the clean room due to the temperature difference caused by condensation condensation so that the parts are damaged by moisture; or generate static electricity easy to make the dust impurities attached to the parts affect the quality of function.

(2) Hospitals, operating theatres, intensive care units, convalescent institutions

Appropriate humidity control not only reduces odour, but also increases the patient's physical and mental comfort and promotes wound healing. Usually, the government or related units have specifications or restrictions for the air conditioning environment in different areas of hospitals, as shown in the following table for reference:

These places generally use steam humidification, because steam is a high temperature sterilised gas, no bacteria, but need to pay attention to the humidification system can not have dripping or condensation phenomenon, to prevent becoming a hotbed of disease vectors. The best humidification system, in addition to the recommended choice of steam humidification, but also recommended the use of fast-absorbing distributor, and configure the excellent performance of the proportional control system, in order to perfectly match;

(3) Textile mills, paper mills, printing plants

Air humidification can prevent the relative humidity of the air is too low and caused by the fibre of the material dry cracks and static electricity, which leads to the production process is not smooth and poor product quality. Suggested temperature and humidity are as follows:

(4) Tobacco factories, painting factories, detonator factories, precision processing factories, cold storage and preservation warehouses, bowling alleys, computer rooms and programme control rooms.

(5) Inspection or environmental testing organisations: Widely used in consumer product testing, divided into two categories.

1. Husbandry test: including individual temperature, humidity, corrosion, or fungus test; or a combination of different tests mentioned above.

2. Power testing: including vibration, electric shock, acceleration, radiation, or pressure testing.

General multi-purpose laboratory usually have a wide range of temperature (2 ~ 85 ℃) and relative humidity (2 ~ 98% RH), in order to meet the needs of different test environment.

(6) Libraries, Art Galleries, Museums

Air humidification can prevent damage caused by air-conditioned air relative humidity is too low to cause the collection of fibres dry and cracked. Many priceless manuscripts, books, works of art, ultra-Microsoft film, tapes and so on, such as not stored in the space with appropriate temperature and humidity control, it is easy to have serious damage; only suitable for the above object of the environment for the lower temperature, often uncomfortable. In general, the lower limit of relative humidity for paper collections in museums is 40%; while the lower limit to prevent drying and hardening of microfilm, magnetic tapes, etc. is 36%; and organic collections require a lower temperature environment. On the other hand, the collection of the museum is usually rotated between the display room and the storage room, it should be noted that even in a temperature and humidity controlled environment, such as heat conduction outside the wall or switching the radiation of the light will still make the collection of the surface temperature change and water evaporation phenomenon and damage to the structure of the collection; In addition, when the collection of the collection of the lower temperature of the storage room to the high temperature of the display room when the collection of the surface temperature rises gradually, at this time the internal Moisture will gradually float on the surface condensation, the formation of moisture transfer phenomenon, this phenomenon will accelerate the collection of old bad degree. It is recommended that the temperature and humidity in the museum are as follows: