Every summer, there will be many videos of "teach you to quickly remove formaldehyde ". : What is "2 times the speed of formaldehyde removal" , "better than ventilation for 3 months" , it is said that the ceiling is full of splendor, the more you want, the more you want, it makes sense at first glance, and the number of likes is very high.
Video screenshot
But if you look closely, you will find these so-called "fast formaldehyde removal" tricks, which are actually essentially "stubborn release method" . So, is this "magical" "punching method" so good to remove formaldehyde?
says nothing. What we need to do is to use experimental data to verify the truth for everyone.
1. Pushing release method VS continuous ventilation method
We used 12 400 mm×600 mm density plates as the formaldehyde release source in our self-built experimental chamber (12 m², 30 m³) as the formaldehyde release source, and simulated the indoor formaldehyde environment and conducted experiments.
In order to restore the as much as possible in summer, the room is stuffy for 2 days and ventilated for 2 hours, we carefully arranged it according to the method described in the video:
01 Place the formaldehyde release source (density board)
02 Turn on the air conditioner to increase the indoor temperature
03 Turn on the humidifier to increase indoor humidity
04 Confined experimental chamber (2 days)
05 Turn on fresh air after 2 days (2 hours) simulated ventilation conditions
At the same time, we also set up two other groups of control experiments, namely: Daily continuous ventilation, ordinary muffled release method (without heating and humidification) . The test conditions are as follows:
2. What is the experimental result?
01 Experimental data
After all three groups of experiments were completed, we obtained a change of formaldehyde concentration in the experimental chamber in different time periods .
From the curve of indoor formaldehyde concentration change, it is not difficult to see that when using the "puke-release method", the indoor formaldehyde concentration rises rapidly in the first period of time, but the growth rate becomes very slow not long after , like a snail climbing a hill, there is not even much change after 1 day.
This means that the "stubborn release method" will allow the formaldehyde released from the board to accumulate indoors, and as time grows, the accumulation becomes slower and slower.
02 Formaldehyde removal effect
So, which method has the best formaldehyde removal effect?
We calculated the amount of formaldehyde removal in these methods through formulas
The result surprised all of us: after 2 days of continuous ventilation in , our density plate released 485 mg of formaldehyde, which is 10 times that of the "dumping method"! !
Even with the enhanced version of the "Heating, Humidity, Drop-up Method" (temperature 31 ℃, humidity 60 %RH), the formaldehyde emission of the plate has only increased to 47 mg.
Facts have proved that in summer, the continuous ventilation method is much better than the "stuffing method" to remove formaldehyde! What some bloggers say "2 times faster formaldehyde removal" and "effective than opening windows for three months" are not suitable for summer.
03 Principle
Why does the "puke-release method" seem to make a very reasonable "stuffing method"? Is the formaldehyde removal effect much worse than the "continuous ventilation method"?
In fact, this is the same principle as our drying of clothes . The wet the environment (the more moisture in the air), the harder it is to dry the wet clothes (the harder the moisture in the clothes is to be released into the air).
Although high temperature and high humidity can indeed promote the release of formaldehyde, when using the "stuffed release method", formaldehyde is sealed indoors. The higher the formaldehyde concentration in the room, the harder the formaldehyde in the board is released - a simple summary is that the formaldehyde release rate of the board becomes lower.
We can calculate it using a formula:
. Use the "puke release method" 3 hours before , and formaldehyde releases faster.
. After 3 hours, the average formaldehyde release rate dropped by 10 times as much as .
, put 1 days later. After , the plate will not release formaldehyde much.
There are also many documents in China that after is sealed for 3 hours, the formaldehyde release rate of the plate will drop to a lower level .
, and the "continuous ventilation method" plate material is used, and the formaldehyde release rate is maintained at around 1.6 mg/(m² h) throughout the whole process. has the highest formaldehyde release rate than the "pushing method" , let alone the improved version of "pushing method" such as "closed at night and ventilation during the day" and "shortening time".
3. How should we remove formaldehyde
Through the above experiment, we can find that The most economical and effective method for formaldehyde removal in summer is continuous ventilation!
Professor Zhang Pengyi, Director of the Institute of Environmental Chemistry, Tsinghua University, also expressed his recognition of the better effect of ventilation and formaldehyde removal in summer
Summary, we can do this:
Of course, the prerequisite for formaldehyde removal is to know whether formaldehyde is exceeding the standard at home. If it does not exceed the standard, there is no need to worry about it. If you want to know whether the formaldehyde at home exceeds the standard, you can reply "formaldehyde" in the background and make an appointment with our formaldehyde instrument to test~
