CO2, an obvious risk in your house.
medidor de CO2
medidor de CO2
A resting person breathes about 12 breaths per minute which results in moving about 360 liters / hour. If we analyze a two person room, all night they “breathe” thousands of liters of air and the CO2 increases rapidly (graph attached), arriving at values of 2,000ppm and up to of 2,500ppm, this has very little health value.
In the mornings, we usually ventilate our rooms. By doing this we get the concentration down to correct values of 400ppm, but it is clear that we have been breathing unhealthy air for many hours, and do so every night. Therefore, throughout our life we will be breathing this air for many years.
A possible solution is to leave the windows open or use windows that have ventilation systems, but it is evident that, regardless of whether we are talking about prefabricated houses or not, energy losses from the hot air coming out of the house goes against the objectives of energy efficiency and economic logic.
The option provided in passive houses is to integrate a dual flow ventilation system with heat recovery. In winter, the equipment draws the hot and used air from the inside to the outside, while it takes clean cold air from the outside, and uses a heat exchanger to avoid losing energy, recovering 90-95% of the heat, so we end up with air that is clean and warm inside.
ventilación de doble flujo
ventilación de doble flujo
Therefore, with a reasonable investment, we obtain a house with optimal levels of CO2 every day of the year and without energy losses.
