Science study #1

Slide 1

• 3.1
• Natural sources for solar energy
• -sun
• -fire
• -geo thermal
• -decay
• *passive vs active solar energy
• In passive solar building design, windows, walls, and floors are made to collect, store, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer.
• A solar collector positioned on the roofs of buildings heats the fluid and then pumps it through a system of pipes to heat the whole building. Photovoltaic cells, or solar panels, are slightly more involved than passive or active solar energy systems.

Slide 2

• -Geothermal energy is heat energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter.
• -Decay heat is the heat released as a result of radioactive decay. This heat is produced as an effect of radiation on materials: the energy of the alpha, beta or gamma radiation is converted into the thermal movement of atoms.
• 3.2
• -the thermostat is supposed to switch the heating on and off, as necessary, to keep the room more or less that warm.
• -bimetallic strip or coil a temperature-sensitive electrical contact used in some thermostats, consisting of two bands of different metals joined face to face along their lengths. When heated, the metals expand at different rates, causing the strip to bend.
• *Local Heating is when a place or objects is heated in a location or heated by suns or heat particles
• *Central Heating is when you heat object by air or hot water this can be a example of (furnace,air conditioner)

Slide 3

• 3.3
• *insulation is any object in a building used as insulation for any purpose. While the majority of insulation in buildings is for thermal purposes, the term also applies to acoustic insulation, fire insulation, and impact insulation.
• *R-value the capacity of an insulating material to resist heat flow. The higher the R-value, the greater the insulating power.
• *Heat loss in a house, the most heat loss is in the wall 35%