Microwaves have the property of selective heating of substances: for example, water is a substance with very strong molecular polarity, and it is more susceptible to microwave heating. Therefore, the higher the water content, the easier it is to absorb microwaves, and the heat is faster and faster. As moisture content decreases, its ability to absorb microwaves also decreases.
In the early stage of product drying, the moisture content in the product is very high, and the power of the microwave equipment has a high impact on the drying effect (water is the best medium for absorbing microwaves). With the extension of time, most of the microwave energy is absorbed by the water and the water quickly migrates. And evaporation; In the late drying period of the product, with the reduction of moisture, the required microwave energy is also less, and the microwave equipment power can be properly diluted. However, there are many products that cannot be dried under high temperature conditions. Microwave vacuum drying equipment is needed at this time: under vacuum, the boiling point of water is reduced, and nutrients, vitamins, etc. can be well maintained. At the same time, in the vacuum system, the content of air in a unit volume is lower than that in the atmosphere. Drying the food in this relatively oxygen-deficient environment can reduce or even avoid the opportunity of oxidation of fat in the food, pigment browning or other oxidative deterioration, Therefore, some products with high added value, such as Cordyceps and Ginseng, are microwave vacuum dried.
Microwave drying equipment is a non-standard customized product. The specific power size and design need to be combined with the product technology, so that the effect will be maximized.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
Air Cleaner,Household Air Cleaner,Office Air Cleaner,Air Cleaner For Children
Ningbo Zhe Kai Electric Appliance Co.,Ltd , https://www.cnairpurifiers.com