I asked Lao Qian, the floor heating is installed at home, why the temperature has not changed when the cold air cold wave comes, why does it feel very hot, and it will feel a little cold immediately?
Heat transfer (or heat transfer) is a physical phenomenon that refers to the transfer of heat energy due to temperature differences. There are three main forms of heat transfer: heat conduction, heat radiation, and heat convection. As long as there is a temperature difference within or between objects, heat energy must be transferred from high to low temperature in one or more of the above three ways.
Thermal radiation, the phenomenon in which an object radiates electromagnetic waves due to having a temperature. One of the 3 ways in which heat is transferred. All objects with a temperature higher than absolute zero can produce heat radiation, the higher the temperature, the greater the total energy radiated, the human body is a good and efficient heat radiator, some common small solar heaters, the power is not large, and can not raise the temperature of the room, but when it shines on you, it gets heat through radiation, so it feels warm.
The human body wears the same clothes, in the same room, whether it feels hot or cold, is not only related to the temperature of our room, after the floor heating is turned on, the temperature of the room is measured by the thermostat or the thermometer in the room, that is, the air temperature of the room. In fact, the air temperature is only related to the convective heat transfer between the person and the air in the room.
When people are in a room, they always use radiation to exchange heat with the inner surface of the room. When the weather cools down, the temperature of the inner surface of the exterior walls and exterior windows decreases, although the air temperature of the room does not change under the action of floor heating, but compared to the warm weather, our body loses more heat in the radiative heat exchange process with the inner surface of the room, so we will feel cold. Conversely, when the outside temperature rises, the surface temperature in the room rises, and the room temperature setting does not change, and the room will feel hotter than before.
So what to do? The only way to increase the temperature of the room is to increase the air temperature in the room and the surface temperature of the inner wall to make up for the discomfort caused by the drop in the surface temperature in the room.