1. Heat is Efficiency = Trapped air is Hot air is IR is absorbed Heating When a solid
transferred by useful energy an insulator in less dense by particles, something makes melts it changes
the vibrations Total energy cavity wall than cold reflected by it hotter. state and its
of the foam. air so it shiny surfaces. E = mcT temp is constant.
particles. Wasted Payback time. rises. Passive solar c is specific heat
energy heating. capacity E = ml
Conduction Insulation Changing
Convection Radiation Heating up
in the home state
Heat Energy
Energy
Generation of electricity
Photocells
Wind power
Fossil fuels
Biomass