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Slide 1

• 3.1
• *Natural Sources of thermal energy
• -Sun
• -Fire
• -Geo Thermal
• -Decay

Slide 2

• *Passive vs Active Solar Energy
• -The key difference between an active solar system and a passive solar system is this: Passive solar energy uses the heat of the sun, while an active solar system uses the sun's irradiance, or radiation (the sun's rays), which it converts to electricity to power systems in your home.
• *Benefits and Costs of Solar Energy
• -Solar power provides energy security. On top of the above reliability benefit, no one can go and buy the sun or turn sunlight into a monopoly. Combined with the simplicity of solar panels, this also provides the notable solar power advantage of energy security, something the US military has pointed out for years, and a major reason why it is also putting a lot of its money into the development and installation of solar power systems.

Slide 3

• -Solar power saves society billions or trillions of dollars. Even long before society’s very existence is threatened by global warming, within the coming decades, global warming is projected to cost society trillions of dollars if left unabated. So, even ignoring the very long-term threat of societal suicide, fighting global warming with solar power will likely save society billions or even trillions of dollars.
• -Solar power helps to slow/stop global warming. Global warming threatens the survival of human society, as well as the survival of countless species. Luckily, decades (or even centuries) of research have led to efficient solar panel systems that create electricity without producing global warming pollution. Solar power is now very clearly one of the most important solutions to the global warming crisis.

Slide 4

• 3.2
• -Thermostat
• the thermostat is supposed to switch the heating on and off, as necessary, to keep the room more or less that warm. In practice, a thermostat like this doesn't switch on and off at a single temperature but cycles between a small range of temperatures either side of the value you set.
• -Bimetallic Strip or coil
• The principle behind a bimetallic strip thermometer relies on the fact that different metals expand at different rates as they warm up. By bonding two different metals together, you can make a simple electric controller that can withstand fairly high temperatures. This sort of controller is often found in ovens. Here is the general layout:

Slide 5

• *Local Heating
• -Heating and cooling systems may be classified as central or local. Central heating and central air conditioning is the most standard method, and is defined by a system that produces warm or cool air in one central area and then distributes it throughout the home.
• *Central Heating
• -A central heating system provides warmth to the whole interior of a building (or portion of a building) from one point to multiple rooms. When combined with other systems in order to control the building climate, the whole system may be an HVAC (heating, ventilation and air conditioning) system.

Slide 6

• -Hot Water Heating
• -Boilers are special-purpose water heaters. While furnaces carry heat in warm air,boiler systems distribute the heat in hot water, which gives up heat as it passes through radiators or other devices in rooms throughout the house. The cooler water then returns to the boiler to be reheated.
• -Forced Air Heating
• -The forced air furnace pulls colder air through the duct work running throughout your home into the furnace where it's heated. Once the furnace heats the cool air, the heated air is then sent back through different duct work and pushed out through heat registers to warm your home​​​​​​​

Slide 7

• 3.3
• *Insulation
• -Thermal insulation is the reduction of heat transfer (i.e the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. ... The insulating capability of a material is measured as this inverse of thermal conductivity
• *R-Value
• he capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.

Slide 8

• *Heat Loss In a Home
• -Through the windows and doors 25%
• -Through the Floor 15%
• -Through the Walls 35%
• -Through the Roof/Attic 25%