Heat Transfer, Conduction, Convection, Radiation, Green Building, Green Buiders, Energy-Efficient Homes, Green HousesPlease Note: This website explains green building for a climate zone comparable to North Texas or Central Texas, such as the climate of Waco or Dallas-Fort Worth, Texas. It is important to hire a green builder who is an expert in energy-efficient building in your climate zone.
This website is for the climate zone that includes North Central Texas or the DFW area such as Plano, Keller, or Dallas-Fort Worth Texas. Regardless of your climate zone, the first priority for green building or energy-efficient remodeling is to hire an energy consultant and a green builder who understand and use up-to-date green building practices for your area.
Heat transfer is an important aspect of greenbuilding. There are three types of heat transfer:
1. Conduction 2. Convection 3. Radiation
Conduction is the transfer of heat througha material. Heat is transferred directly in and through the substance.Conduction heat loss or gain results from the transfer of heat directly throughthe materials of the building envelope. If the outside temperature is greaterthan the inside temperature, there is heat gain from outside the building.
Heat is primarily lost or gained through our windows, walls and roofs.
We speak of building materials as being poor or good conductors of heat.
Two objects must be touching for this transfer to occur.
Conduction is an important transfer (in order ofimportance) through 1. Solid objects 2. Liquids 3. Gases
Convection is the transfer of heat fromparticle to particle. It is the transfer of heat by the movement of fluids suchas air or water. For example, the heated air around a stove will tend to rise tothe ceiling. We all know hot air rises and cool air sinks. That is naturalconvection. Forced convection refers to the use of fans or pumps to move afluid/air and the heat contained in it. We generally have forced-air furnaces inour homes.
Convection transfers heat (in order ofimportance) 1. Between fluids and solids 2. Within fluids.
Radiationis energy transmitted directly through space. Although itdoes not require matter in transmission, it does require a line of sightconnection between the objects. All objects radiate energy or heat, which heats all cooler objects around it.Solar radiation passes through space to heat (and light) objects that itstrikes. A person in a room with cold windows will radiate heat to the windowsand that person will feel cool even if the air in the room is warm. If thewindow is covered, the sight connection is broken and that person will no longerfeel cool.
The greenhouse effect is experienced firsthand by entering a closed car that has been sitting in the sun. Solar radiationis primarily in the range of visible light, and readily passes throughtransparent objects, like the car window, then is absorbed by the objects insideand converted to heat. Much of the inside build-up of heat from the sunshine isdue to the protection of the enclosure. It provides against heat loss byconvective air movement.
Phase change happens at constanttemperatures with the movement of energy or latent heat. For example,evaporation absorbs energy and condensation releases energy.
Do you need an energy consult or energy audit or green builder/remodeler in North Central Texas or the Dallas-Fort Worth area? Contact Terry Jensen Frugal Energy, LLC 817 443-2553 or 972 251-1532
Note: The opinions expressedherein are exclusively those of the writers or other participants and do not necessarily reflect theposition of CyberParent,LLC. They are not intended to take the place of advice of ahealth, legal, or other professional whose expertise you might need to seek.This website explains green building and green remodeling for a climate zonecomparable to North Central Texas or Dallas-Fort Worth, Texas, It isimportant to hire a green builder and an energy consultant who are experts inenergy-efficient building in your climate zone and who use the most up-to-dategreen building information.