How UFH Portable CO2 Air Scrubber removes carbon dioxide.

 

Q. What does "filtration of CO2" mean?
What is the difference in indoor air before and after CO2 filtration?
 
A. In air freshly cleaned with UFH Portable CO2 Air Scrubber, the concentration of carbon dioxide is close to that of fresh air (nearly 400 ppm CO2). The difference between the freshly cleaned air and the stale air in the room is 800 to 1300 ppm or more. The freshly cleaned air mixes with the room air and thus reduces the total CO2 level in the room.
 
Q. It is mentioned that the only maintenance required is changing the pre-filter every 6-12 months.
Which is correct?
 
A.  It should be replaced every 6-12 months depending on how dusty the air in the room is.

 

Q. When we use UFH Portable CO2 Air Scrubber, how can we know how much CO2 is adsorbed?
 
A. As yet there is no sensor which will indicate this.
We currently recommend setting your CO2 Air Scrubber device for a filtration mode of up to 12-14 hours, with a regeneration mode of 4 hours.

 

Q.  The effects of CO2 Air Scrubber include alleviating tiredness and allergies, etc...
But these effects come not only from the removal of CO2 but also from UFH Portable CO2 Air Scrubber’s other function as a dust cleaner. Since there are a number of other air cleaning devices on the market that just remove dust, we’re curious about what the effects are that come specifically from the removal of CO2.

 
A. UFH Portable CO2 Air Scrubber is  two air cleaners in one. It cleans the air of dust, pollen, mold and other pollutants, using pre-filter and ABEK filter, but it also reduces the CO2 level in the room. We may say that many air cleaners have HEPA and activated-carbon filters to clean the air. But only UFH Portable CO2 Air Scrubber has a filter that can reduce the CO2 level indoors.
 
When people indoors feel a lack of fresh air, they say “the room is stuffy.”
That happens mostly because of an increased level of CO2, and not because of a lack of oxygen, as some people think. The CO2 level grows very quickly in the closed room. Each of us breathes out a concentration of CO2 100 times greater than in the atmosphere. Scientific research shows that the inability to concentrate, tiredness, headaches and other symptoms which you feel in a stuffy room start happening when the indoor CO2 level is higher than 800 to 1000ppm . The idea that CO2 itself can cause health problems is relatively new, but in this century more and more scientific studies on this issue are appearing.

The UFH Portable CO2 Air Scrubber device provides three stages of filtration.
1. pre-filter removes dust, pollen 
2. ABEK filter removes VOC and unpleasant smells
3. carbon dioxide filter cassette removes excess CO2


Q.

We still don’t understand how the UFH Portable CO2 Air Scrubber works to regenerate indoor air?
For example, there is 50L of CO2 in the room. The UFH Portable CO2 Air Scrubber adsorbs 30L, so there is 20L of CO2 remaining in the room?
At night, the UFH Portable CO2 Air Scrubber releases the 30L of CO2, so again there is 50L of CO2 in the room, right?
Doesn’t that mean that the quantity of CO2 doesn’t change?
 
A. Let us consider two examples, without UFH Portable CO2 Air Scrubber and with  CO2 Air Scrubber.
 
Main source of indoor CO2
• Humans (18-25 L/hour)
 
 
1. Without  CO2 Air Scrubber
For example, there is 20L of CO2 in the room in the morning when you come to the office. You breathe out 30L. There is a total of 50L of CO2 during the time you are in the room. So during the time you are in the room there is poor quality air because there is no filtration of CO2.
 
2. With  CO2 Air Scrubber
Using the same example, there is CO2 of 20L in the room in the morning when you come to the office. You breathe out 30L. The CO2 Air Scrubber absorbs the 30L of CO2, so there is 20L of CO2 during the time you are in the room.
So with the  CO2 Air Scrubber, there is good quality air in the room during the time you are there because there is filtration of CO2.
 
 
At night there is nobody in the room and there is no source of additional CO2 besides the CO2 Air Scrubber that releases the 30L of CO2 over the course of 4 hours, for example from midnight to 4AM. However, considering the high diffusion ability of  CO2 gas, it is easily removed from a premises
through natural drafts or by means of a ventilation system. This means that when you come to the office in the morning at 9AM there is again 20L of CO2 in the room.


Q.

About releasing the CO2 into the room, why do you do this? We don't understand about the filter regeneration?

After the filter has adsorbed CO2, where does the CO2 go?
 
A. There are two cycles in our device: filtration and regeneration.
 
The functioning of the device is as follows.  The CO2 Air Scrubber removes carbon dioxide from the air when people are in the room (the filtration mode). And regenerates when people are out of the room.
Since people breathe out about 25 liters/hour of carbon dioxide, regeneration should be conducted at least once a day, when people are out of the room.
Filter regeneration should occur when rooms are empty.  For example, in offices, it could take place at night time and in a bedroom in the day time, when you do not use it. So during regeneration, carbon dioxide is released into the room. But considering the high diffusion ability of CO2 gas, it may be easily removed from a premises through natural drafts or by means of a ventilation system, so that by the time people return to the premises, CO2 will be reduced to normal levels.
 
The filtration mode is up to 12-14 hours. During this cycle a special chemical captures and absorbs the carbon dioxide. The regeneration mode lasts 4 hours. The device is fully automatic. There is a control panel which can be programmed to automatic mode and then  CO2 Air Scrubber works every day fully automatically. Or you can use manual mode as well to start filtration and regeneration cycles whenever you need to.
 
 
 Q. 

It is mentioned that using  CO2 Air Scrubber can reduce the density of CO2.

Does it mean that it removes CO2, or that there is the same quantity of CO2 but only less density?
 
A.  CO2 Air Scrubber reduces the quantity of molecules of CO2 in the indoor air, so that means that the CO2 level decreases.

 
Q.

Could you let us know how CO2 affects people?
For example, there are a lot of air cleaners on the market that adsorb dust and smells, but they don't absorb CO2. So we'd like to know how it affects people to live with CO2.
The other air cleaners also say they make people refreshed and improve sleep and remove smells. We see that your product does those things too. So what is the benefit directly related to the removal of CO2?
 
 

A. UFH Portable CO2 Air Scrubber is  two air cleaners in one. It cleans the air of dust, pollen, mold and other pollutants, using pre-filter and ABEK filter, but it also reduces the CO2 level in the room. We may say that many air cleaners have HEPA and activated-carbon filters to clean the air. But only UFH Portable CO2 Air Scrubber has a filter that can reduce the CO2 level indoors.
 
When people indoors feel a lack of fresh air, they say “the room is stuffy.”
That happens mostly because of an increased level of CO2, and not because of a lack of oxygen, as some people think. The CO2 level grows very quickly in the closed room. Each of us breathes out a concentration of CO2 100 times greater than in the atmosphere. Scientific research shows that the inability to concentrate, tiredness, headaches and other symptoms which you feel in a stuffy room start happening when the indoor CO2 level is higher than 800 to 1000ppm . The idea that CO2 itself can cause health problems is relatively new, but in this century more and more scientific studies on this issue are appearing.
 
Q. In our country, we receive tax cuts if we can reduce CO2. So if there is no change in the overall quantity of CO2, we can't get those tax cuts, is that right?
 
A. Yes, that’s probably the case, because CO2 Air Scrubber doesn’t permanently eliminate CO2. The process we use with CO2 in  CO2 Air Scrubber is the same as when you have some water on the floor and you want to get rid of it with a sponge.
You put the sponge down and it gathers water up. So that solves your immediate problem. But if you want to use your sponge for a second time you need to wring it out in the sink. The water is removed from the sponge, which is now dry for you to use again.
CO2 Air Scrubber acts in the same way, it helps you by gathering up the excessive level of CO2. Then you need to regenerate it, just like wringing the water out of your sponge so you can use it again.

There are actually some substances that can be used to remove CO2, that are employed in special situations like in spacecraft or submarines. But then you can’t use these for a second time, you need to throw them away.
Unlike  CO2 Air Scrubber, which can work for 15 years without replacing the absorber-cassette.
 
Q.  Is it the wrong terminology when we say " removing the CO2"? Should we say "reducing the CO2"?
 
A. You are quite right that reducing CO2 sounds better. But you may also say removing excess CO2. We can’t and we need not remove CO2 totally from the air. People need it for the breathing process, but in a very small quantity, only about 350-400ppm.

Q. Please also tell me about noise of the device during operation, especially at night.

A. For this, please refer to product information available at UFH Portable CO2 Air Scrubber  specification. You will find all the information you need there.