The Dissipated

If this air passes through the lungs, the oxygen is absorbed by the blood and carbon dioxide is extracted from the blood. As the exhaled air contains 3.5% carbon dioxide and 17% of oxygen, approximately, the content of carbon dioxide from the surrounding air has been increased by 3.48% approximately and the oxygen to been decreased approximately 4% by the madman of the exhalation. Furthermore the exhaled air contains a 6% moisture, but as us inhalamos fresh air only 1% of moisture, exhaled a 5% more humidity than what is taken. Another interesting and important fact is that when a person is at rest, only 0.9% of carbon dioxide you exhale, but to make effort, is exhaled by almost 5%. The process of purification of the blood in the lungs is somewhat complicated.

However, we know that blood charged with carbonic acid is sent, by heart, to the lungs and is returned to the heart pure, and carbonic acid, free but charged of oxygen, which is distributed, along with the blood throughout the body. Exhaled gas from the lungs consist of carbonic acid, water moisture, a very small amount of ammonia and some organic matter. Volume of air inhaled the average of air inhaled every time is 30 cubic inches, but a robust man can inhale up to 220 cubic inches fully expanded chest. An adult at rest, requires some 668.000 cubic inches (approximately 386 cubic feet) of air every 24 hours, or 38 cubic feet per hour. A worker doing a heavy job, needs approximately 1.586.900 cubic inches, which equals about 918 cubic feet of air every 24 hours, or 38 cubic feet per hour. The equivalent of the mechanical work done to breathe 24 hours is equal to lift 21 tonnes (42,000 lbs) to the height of one foot. This shows us that the human body has a system or machine cooling air without equal. Heat energy developed to do any mechanical work produce calos in our body, because power may not be exercised without producing heat.

This heat energy varies between 400 BTU per hour, for a person at rest, and something more than 4,500 BTU per hour for the same person in extreme activity. This heat, continually renewed, must be dissipated by the body, which is made partially by radiation (46%), partially by evaporation (15%) and in part by convection (38%). Of course, these proportions are not fixed will vary according to the temperature of the surrounding and adjacent masses, the air movement and relative humidity of the air. For example, if you increase the temperature of the surrounding walls and other objects, the body eliminate less heat by radiation, but the amount of heat dissipated by evaporation and convection should be greater to the dissipated total value is the same. All of these details should be on hand for future reference, because these and other factors are that determine what is expected of an air conditioning system to give the greatest possible comfort to our bodies. Another important fact to remember is that, if, at a given temperature, the air becomes saturated humidity, body does not eliminate the same amount of heat by evaporation, which the who would eliminate in the dry air at the same temperature. Therefore, the body will feel cooler in that dry air in air saturated with moisture, however that the dry air, the damp are the same temperature. Original author and source of the article


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