PRESENTATION OUTLINE
Heating Systems
A heating system is something that is used to transfer energy into a room. Air or water can be a source for a heating system. Your body is a heating system because it maintains its temperature.
Energy is transferred as heat from the building to the outside air. Energy is transferred as heat to water, steam, or air. After the energy moves through the pipes, heat enters the rooms.
Many things use external sources, such as the sun. Energy is absorbed through conduction and radiation. Solar energy is used to heat houses.
Cooling Systems
A cooling system is when the molecules in air lose some kinetic energy when the air's pressure and volume change and the temperature decreases. Energy is transferred as heat from one substance to another, causing the first substance to have less energy, creating a lower temperature.
Evaporation is used to transfer energy from their surroundings. A refrigerant is used to cool an object to a temperature that is lower than the environment's temperature.
Energy is transferred by condensation. Air conditioning systems in homes use the same process as refrigerators. Convection cools a room when warm air flow returns.
Heat Engines
A heat engine is a machine that transforms heat into mechanical energy, or work. This is done through combustion. There are internal and external engines. They are decided by where the combustion takes place.
Internal engines burn fuel inside. This happens through a four-stroke cycle. The four strikes are intake, compression, power, and exhaust. However, some internal engines operate differently.
Internal combustion engines have many different features. There can be a variety in numbers of Pistons and cylinders. Engines that have more cylinders have more power.
