The co2 breathing emission calculator works out room’s initial co2level, max number of people in the room and co2concentration (ppm) from air changes per hour (ach), outdoor co2concentration, c not, people usually stay here for…, k, maximum co2emission per person, minimum co2emission per person, average room population, ceiling height, length and width. Enter what you have and the relationship is applied straight away, so you get the answer without working through the algebra yourself.
What Is the CO2 Breathing Emission Calculator?
The co2 breathing emission calculator works out room's initial co2level, max number of people in the room and co2concentration (ppm) from air changes per hour (ach), outdoor co2concentration, c not, people usually stay here for..., k, maximum co2emission per person, minimum co2emission per person, average room population, ceiling height, length and width.
Biological relationships are usually approximations rather than exact laws, so the output is best treated as an estimate with a sensible range around it.
How the CO2 Breathing Emission Calculation Works
The calculation applies the relationship as published, step by step, so each intermediate value can be checked against the underlying theory.
Keep the units consistent throughout. Mixing a percentage with a proportion is the single most common source of an answer that is out by a factor of a hundred.
Assumptions Worth Knowing
Any relationship used here assumes a constant rate, a representative sample, or a stable population. Real populations rarely meet those conditions for long, so treat the answer as a guide.
Where the inputs are field measurements, a single misread value can shift the result noticeably. Measure carefully and record what you used.
A Worked Example
Working through an example, with air changes per hour (ach) set to 10, outdoor co2concentration set to 5, c not set to 2, the calculator returns floor area of 10, and max number of people in the room of 2, and volume of 100. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out room's initial co2level?
Enter air changes per hour (ach), outdoor co2concentration, c not, people usually stay here for..., k, maximum co2emission per person, minimum co2emission per person, average room population, ceiling height, length and width. The calculator then works through the relationship and reports room's initial co2level, max number of people in the room and co2concentration (ppm).
What does the co2 breathing emission actually calculate?
It takes air changes per hour (ach), outdoor co2concentration, c not, people usually stay here for..., k, maximum co2emission per person, minimum co2emission per person, average room population, ceiling height, length and width and converts them into room's initial co2level, max number of people in the room and co2concentration (ppm) using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter air changes per hour (ach)?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.
Is the answer exact?
It is as exact as the formula and the inputs allow. The method itself is the standard one for this problem, so the only sources of error are the figures you enter and the precision you ask for.