| Question | Answer |
| Shockley-Queisser Limit | max efficiency of single p-n junction (33.7%) |
| Passive Solar | orienting buildings to sun, selecting materials with favorable thermal properties |
| Active Solar | use techniques like PV systems, concentrated solar power, and solar water heating using a solar thermal collector |
| Solar Water Heating Direct | uses solar thermal collector to circulate water |
| Solar Water Heating Indirect | uses solar thermal collector to transfer heat through liquids |
| Solar Water Heating Active | using pumps to circulate water |
| Solar Water Heating Passive | heat driven-convection |
| Evacuated Tube Collectors | take up 44% of common solar water heaters |
| Glazed Flat Plate Collectors | take up 34% of common solar water heaters |
| Unglazed Plastic Collectors | take up 21% of common solar water heaters |
| Solar Thermal Energy (Low Temp) | for heating spaces (i.e. swimming pools) |
| Solar Thermal Energy (Medium Temp) | for heating water or air in residential or commercial buildings |
| Solar Thermal Energy (High Temp) | uses mirrors or lenses to heat |
| Solar Cookers | heats with Fresnel mirrors |
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