HOW DO YOU BREATHE, PASSENGER?
In the throat perspiration, cough tortured. Let's try a filter for the ventilation system.
Anatoly KARPENKOV, Mikhail KOLODOCHKIN
Designers are very concerned about the health of iron organisms. Knowing that all engines are allergic to dust (poor fellows sneeze, stink and even die), filters were provided for their normal life - oil, fuel and air. The requirements are tough. For example, an air filter “has the right” to pass no more than 10 g into each cylinder of a carburetor engine from each kilogram of dust, and if it is an injection engine, no more than 6 g. To prevent the car from suffocating, such a filter must have minimal airflow resistance.
And what are we breathing with you - drivers and passengers? Yes, the same as the engine under the hood, but, as a rule, without any filters, except for your own nose. Through the ventilation grilles of “Muscovites” and “Samar” even leaves from trees sometimes fly into the salon - what can we say about poplar fluff, pollen of plants and just dust of all kinds and sizes. Statistics say: up to 20 g of all this rubbish settles every year in our lungs - is there a good prospect? Allergy, asthma - brr …
For large debris like fallen leaves, craftsmen put an obstacle from old tights, pulled on the entrance of the air intake. It’s simple, but it still won’t save you from dust, and it’s awkward at the turn of the century to lower yourself to grandfather’s methods. There is a modern solution called “air filters with filtering and sorbing elements”. Simply put, the owners of “Samar”, “Volga” and “41” “Muscovites” offer a device designed to absorb all of the above dirt instead of us. In the plastic housing of such a filter, you can insert replaceable elements - ordinary or carbon. The cost of products is from 55 to 165 rubles, replaceable elements - from 15 to 35 rubles.
The usefulness of the new items seems obvious, and the price is reasonable. It’s easy to install on a car - each filter is equipped with instructions with pictures. The manufacturer - the metropolitan company Filter-Serv promises "fresh breath" for one year or 30, 000 kilometers.
Of course, not everything is so simple. Firstly, with the windows open, there will be no sense in the filters - this is not an air conditioner. Secondly, the better the filter retains dust, the worse the ventilation. To test the “purge”, we selected two cars - Samara with a high panel and Moskvich 2141. Having opened all the outlet nozzles of the air ducts, we put the flaps in the “air up” position and then measured the air flow velocity “before and after” in forced ventilation mode at two fan speeds. Conventional nozzle numbers correspond to Fig. 1. (The nozzles 7 and 8 have been canceled on Muscovites in recent years.)
The study of air jets driven into the labyrinths of automotive products is amusing in itself. The picture with the filters is even more interesting - a decrease in the air flow rate at various points of Samara is shown in Fig. 2 and 3. “Moskvich” is devoted to rice. 4 and 5.
Let's start with Samara. Calculations show that when the first fan stage is switched on, an ordinary dust filter reduces the air speed by an average of 61.4%, and in the second stage by 52.8%. Since the carbon filter, according to the manufacturers, is more efficient, the reduction in speed should be even more noticeable. And so it happened - in the first stage, 77.1% was lost, and in the second - 70.2%.
The Moskvich average is much better. The dust filter “ate” only 22.5% of the speed in the first stage of the fan and 21% in the second. His coal colleague was more voracious - 53.8 and 34.5%, respectively.
If even a brand new filter provides such obvious resistance to air, then what can we expect from its dirty counterpart? To answer this question, a Samara equipped with a dust filter was sent to collect dust “by city and by weight”, and after 10, 000 kilometers (1/3 of the city, 2/3 of the highway), air flow rates were again measured. The appearance of the filter before and after the run is shown in the photo.
Each nozzle reacted to a clogged filter in its own way - according to fig. 6. The first stage of the fan reduced its return by an average of 34.8%, the second - by 38.1%. It turns out, in comparison with a machine that is not equipped with a filter, only a small fraction of air gets into the cabin of our Samara - about a quarter during the operation of the first fan stage and less than a third - in the second stage.
We did not wait for the situation, which they say “there was no breathing in my goiter” - the replacement element honestly worked, it’s time to resign. He did not reach the promised 30, 000 km, but, apparently, the kilometer in the Moscow region is equivalent to three kilometers on the far periphery … Therefore, the first impression of Filter-Serv products is good - they know how to retain dust and dirt.
Fig. 1. Conventional numbering of defrosters - fresh air wandering through the air ducts penetrates into the cabin from them.
Fig. 2. Change in air flow rate on the VAZ 2109 3 with a high panel after installing a dust filter. The indicators obtained in the first stage of the fan are highlighted in blue, and in the second stage in red.
Fig. 3. Change in air flow rate on the VAZ 2109 3 with a high panel after installing a carbon filter. The indicators obtained in the first stage of the fan are highlighted in blue, and in the second stage in red.
Fig. 4. Change in air flow rate on the AZLK-2141 after installing a dust filter. The indicators obtained in the first stage of the fan are highlighted in blue, and in the second stage in red.
Fig. 5. Change in air flow rate at AZLK-2141 after installing a carbon filter. The indicators obtained in the first stage of the fan are highlighted in blue, and in the second stage in red.
Fig. 6. Change in air flow rate on the VAZ 2109 3 with a high panel with a dust filter installed after a mileage of 10, 000 km (relatively clean filter). The indicators obtained in the first stage of the fan are highlighted in blue, and in the second stage in red.
Filters for everyone - for both VAZ and GAZ …