1–97e it is well-known that cold air feels much colder in windy weather than what the thermometer reading indicates because of the “chilling effect” of the wind. this effect is due to the increase in the convection heat transfer coefficient with increasing air velocities. the equivalent wind chill temperature in °f is given by [ashrae, handbook of fundamentals (atlanta, ga, 1993), p. 8.15] tequiv 5 91.4 2 (91.4 2 tambient) 3 (0.475 2 0.0203v 1 0.304! v ) where v is the wind velocity in mi/h and tambient is the ambient air temperature in °f in calm air, which is taken to be air with light winds at speeds up to 4 mi/h. the constant 91.4°f in the given equation is the mean skin temperature of a resting person in a comfortable environment. windy air at temperature tambient and velocity v will feel as cold as the calm air at temperature tequiv. using proper conversion factors, obtain an equivalent relation in si units where v is the wind velocity in km/h and tambient is the ambient air temperature in °c. tequiv 5 33.0 2 (33.0 2 tambient) 3 (0.475 2 0.0126v 1 0.240! v )

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop

so here is the information for current research:

-nrel's geothermal analysts, scientists, and engineers perform a full range of research from developing advanced methods of locating and accessing geothermal resources to exploring innovative technologies to extract and produce clean energy from the heat of the earth

and here is the information for the technology of geothermal energy:

-it's clean and sustainable

-resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma

-almost everywhere, the shallow ground or upper 10 feet of the earth's surface maintains a nearly constant temperature between 50° and 60°f (10° and 16°c)

-geothermal heat pumps can tap into this resource to heat and cool buildings

-a geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building

-in the winter, the heat pump removes heat from the heat exchanger and pumps it into the indoor air delivery system

-in the summer, the process is reversed, and the heat pump moves heat from the indoor air into the heat exchanger

-the heat removed from the indoor air during the summer can also be used to provide a free source of hot water