Geostationary orbit Denotes a point in space at which it takes an object 24 hours to circle the earth. Approximately 35,860 km (22,270 miles) above the earth's surface. A satellite at this point appears not to move when viewed from earth. Geosynchronous Geostationary. Gigawatt A billion watts. Heat A form of energy (sometimes called thermal energy) transferred between systems because of a difference in temperature and existing only in the process of energy transformation. Heat capacity The ratio of the heat absorbed or lost by a system to the corresponding temperature rise and fal1. Heat transfer The transfer or exchange of heat by radiation, conduction, or convection within a fluid, and/ or between a fluid and its surroundings. Heat-transfer fluid Either a liquid or a gas that absorbs heat and transfers it from the point of collection to storage or use. In this sense is used in sol ar-thermal systems to turn turbines. Hertz A frequency of one cycle per second. Hypersonic Equal or greater than five times the speed of sound. Incident light Light that directly strikes something. Inflated In this sense denotes a type of solar concentrator that is filled with air, and one of the inside surfaces, covered with some reflective material, focuses sunlight.
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