A House’s Function for Human’s Need of Air

A house is essentially a shelter. And any shelters – house, some type of roof above the head, etc. – have one function for human, as a protection for human against the world. The world, the outside, is harsh, and human needs a house to protect them against the weather. A house’s function for human is to provide an environment that maintains their well-being.

Human requires a specific inside atmosphere. A house’s function for human is to give them gently moving (not draughty), well-oxygenated air, pleasant warmth, air humidity and sufficient light. To provide a human these conditions, a house’s location, orientation in the landscape, its arrangement of spaces, and its type of construction are important factors to be considered.

The prime requirement for a house to promote a lasting feeling of well-being for human is an insulated construction, with appropriately sized windows placed correctly in relation to the room furnishings, sufficient heating and corresponding draught-free ventilation.

Production of carbon dioxide and water vapour by humans

Production of carbon dioxide and water vapour by humans

A house’s function for human means it must account human’s need of air. Human breathes in oxygen within the air and expels carbon dioxide and water vapour when they exhale. These vary in quantity depending on the individual’s weight, food intake, activity and surrounding environment →① – ③. On average, human beings produce 0.020 m3/h of carbon dioxide and 40 g/h of water vapour.

If carbon dioxide content in a certain environment or area is more than 1% and less than 3%, deeper breathing in a human will be stimulated. Therefore, a house should not contain more than 1% of carbon dioxide.

With that condition, it means with a single change of air per hour, air space requirement for a human adult is 32 m3 per adult in a house and 15 m3 for each child. However, because the natural rate of air exchange in free-standing buildings, even with closed windows, reaches 1½ to 2 times this amount, 16-24 m3 is sufficient (depending on the design) as a normal air space for adults and 8-12 m3 for children.

In other words, if a house’s room’s height is ≥2.5 m, the room’s floor area in a house should give 6.4-9.6 m2 for each adult and 3.2-4.8 m2 for each child. With a greater rate of air exchange, (e.g. sleeping with a window open, or ventilation via ducting), the volume of space per person for living rooms can be reduced to 7.5 m3 and for bedrooms to 10m3 per bed.

Where air quality is likely to deteriorate because of naked light, vapour and other pollutants (as in hospitals or factories and in enclosed spaces such as in an auditorium) do not, so the rate of exchange of air in a house for human must be artificially boosted in order to provide the lacking oxygen and remove the harmful substances.

No Comments

Leave a Comment