Theory and troubleshooting using short modules packed with images to make learning quick and easy.
Lessons on heat, temperature, and how heat moves. For students and working technicians building heat theory before service work.
There are three types of heat transfer; conduction, convection, and radiation. Conduction Conduction is the transfer of heat between objects that are in direct contact. Example: A pot on a stove burner. As the pot absorbs heat, heat will transfer through the pot handle to your hand. Convection Convection is when a fluid, such as…
Sensible Heat Sensible heat is the amount of heat, (molecular motion), you can measure with a thermometer. It's the amount of heat you add or remove to a substance that changes a substance temperature but does not change the state of a substance. Latent Heat Latent heat is heat added or removed that will change…
A British Thermal Unit (Btu) is a measurement of heat energy. One Btu is the amount of heat required to raise 1lb of water by 1°F. Btu per hour, or Btuh, is the capacity of a heating system such as a 40,000 Btuh furnace. With air conditioning, you’ll often hear people express the cooling capacity…
People often say heat rises, but that’s not entirely true. While hot air weighs less than cold air and will naturally rise, heat travels in all directions; from hot to cold. Heat flows between substances when there’s a difference in temperature. If you leave a 32°F ice cube sitting in a 69°F room, heat from…