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Heat in a solar thermal system is guided by five basic principles: heat gain; heat transfer; heat storage; heat transport; and heat insulation. [59] Here, heat is the measure of the amount of thermal energy an object contains and is determined by the temperature, mass and specific heat of the object.
Solar energy is the radiant energy from the Sun's light and heat, which can be harnessed using a range of technologies such as solar electricity, solar thermal energy (including solar water heating) and solar architecture.
Optically a solar power tower is the same as a circular Fresnel reflector. The working fluid in the receiver is heated to 500–1000 °C (773–1,273 K or 932–1,832 °F) and then used as a heat source for a power generation or energy storage system. [44] An advantage of the solar tower is the reflectors can be adjusted instead of the whole tower.
Heat is radiated from the panels into the enclosed space, where the air is either circulated into a building HVAC system to recapture heat energy, or rises and is vented from the top of the structure. The heat transfer capability of air is lower than that of typically used liquids and therefore requires a proportionally higher mass flow rate ...
The heat transfer fluid can be air, water, oil, or a mixture including glycol (an antifreeze fluid), especially in forced circulation systems. [32] Concentration systems may utilize phase change materials such as molten salts. [33] The thermal energy of the heat transfer fluid can then be used directly or stored for later use. [34]
Solar power is anticipated to be the world's largest source of electricity by 2050. Solar power plants, such as Ivanpah Solar Power Facility in the Mojave Desert produces over 392MW of power. Solar projects exceeding 1 GW (1 billion watts) are in development and are anticipated to be the future of solar power in the US. [citation needed]
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