Heat is transmitted in three ways:
1. Conduction. When the tea spoon in hot tea burns your fingers, that is heat conduction. Metals transmit heat because their atoms are connected in their crystalline structure.
2. Radiation. When you feel the heat of a fire, of an electrical radiator or of the Sun, that is heat transmitted through radiation. The radiation is electromagnetic radiation, like visible light and radio waves, more specifically infrared radiation, with a frequency below visible light and above radio waves.
3. Physical transportation. When you heat a brick and you move it from one room to another, that is physical transportation of heat. This also happens when a hot wall heats the air next to it, and the air rises because it gets lighter and it's replaced by colder air, until the air is heated. This is called natural convection. When the air is blown upon the wall, you get forced convection, which is more efficient than the natural one.
Air conditioning cools the air in a room, but the walls remain hot for a long time. It's like being in a hot oven while cold air is blown upon you. The body is still heated by radiation coming from the walls, and it is cooled by the cold air blown by the air conditioning device.
I don't know why air conditioning is so harmful to people's health. Maybe the body feels the radiation better than the cold air and cools itself too much.
The solution would be to cool the walls instead. I've seen this solution applied in one place only: buses in Budapest. They were blowing cool air through a string of very tiny holes along the ceiling. The air was flowing along the ceiling and then along the walls due to the Bernoulli effect. They were using a very low flow of air, but it was very efficient and very harmless.
Yet people did not adopt this solution, neither in the West, nor in the East. This does not suggest that they are as intelligent as they like to think they are.
1. Conduction. When the tea spoon in hot tea burns your fingers, that is heat conduction. Metals transmit heat because their atoms are connected in their crystalline structure.
2. Radiation. When you feel the heat of a fire, of an electrical radiator or of the Sun, that is heat transmitted through radiation. The radiation is electromagnetic radiation, like visible light and radio waves, more specifically infrared radiation, with a frequency below visible light and above radio waves.
3. Physical transportation. When you heat a brick and you move it from one room to another, that is physical transportation of heat. This also happens when a hot wall heats the air next to it, and the air rises because it gets lighter and it's replaced by colder air, until the air is heated. This is called natural convection. When the air is blown upon the wall, you get forced convection, which is more efficient than the natural one.
Air conditioning cools the air in a room, but the walls remain hot for a long time. It's like being in a hot oven while cold air is blown upon you. The body is still heated by radiation coming from the walls, and it is cooled by the cold air blown by the air conditioning device.
I don't know why air conditioning is so harmful to people's health. Maybe the body feels the radiation better than the cold air and cools itself too much.
The solution would be to cool the walls instead. I've seen this solution applied in one place only: buses in Budapest. They were blowing cool air through a string of very tiny holes along the ceiling. The air was flowing along the ceiling and then along the walls due to the Bernoulli effect. They were using a very low flow of air, but it was very efficient and very harmless.
Yet people did not adopt this solution, neither in the West, nor in the East. This does not suggest that they are as intelligent as they like to think they are.
Heat is transmitted in three ways:
1. Conduction. When the tea spoon in hot tea burns your fingers, that is heat conduction. Metals transmit heat because their atoms are connected in their crystalline structure.
2. Radiation. When you feel the heat of a fire, of an electrical radiator or of the Sun, that is heat transmitted through radiation. The radiation is electromagnetic radiation, like visible light and radio waves, more specifically infrared radiation, with a frequency below visible light and above radio waves.
3. Physical transportation. When you heat a brick and you move it from one room to another, that is physical transportation of heat. This also happens when a hot wall heats the air next to it, and the air rises because it gets lighter and it's replaced by colder air, until the air is heated. This is called natural convection. When the air is blown upon the wall, you get forced convection, which is more efficient than the natural one.
Air conditioning cools the air in a room, but the walls remain hot for a long time. It's like being in a hot oven while cold air is blown upon you. The body is still heated by radiation coming from the walls, and it is cooled by the cold air blown by the air conditioning device.
I don't know why air conditioning is so harmful to people's health. Maybe the body feels the radiation better than the cold air and cools itself too much.
The solution would be to cool the walls instead. I've seen this solution applied in one place only: buses in Budapest. They were blowing cool air through a string of very tiny holes along the ceiling. The air was flowing along the ceiling and then along the walls due to the Bernoulli effect. They were using a very low flow of air, but it was very efficient and very harmless.
Yet people did not adopt this solution, neither in the West, nor in the East. This does not suggest that they are as intelligent as they like to think they are.
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