Home design

Heat flows by three mechanisms: conduction, convection and radiation.Conduction is moleculetomolecule transfer of kinetic energy, a molecule is converted into energy, and in turn energizes adjacent molecules. Castiron handle skillet heated by conduction through the metal. Convection is the transfer of heat by the physical movement of molecules of energy from one place to another – for example, warm air rises, or a heating system using FORCEDOS fans to push hot air around a house. Radiation is the transfer of heat through space via electromagnetic waves (radiant energy), a fire can get warm, even in windy conditions between you and the fire, because radiation is not affected by the air.

With the buildings, the heat flow is measured in a number of different ways. R-value describes a material or the resistance of a heat development component higher the R value flow.The of a material, the better to resist heat loss or heat gain. Ufactor is a measure of how much heat flows through a material reality in a given time and given a certain difference in the temperature of a material side to the other – the heat always flows from warm to cold side. Ufactor R value and are the inverse of each other: U = 1 / R. For example, if a wall has an average R value of 15, the Ufactor for the wall would be 1 / 15, or 0.067.That Ufactor tells us how many BTU of energy will move through one square foot of wall every one degree Fahrenheit temperature difference between wall
(0.067 Btu/ft2 ° F · · h). The materials are very good to resist heat flow (high R-value, low Ufactor) can serve as insulation materials.