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G. with use of an electric generator the energy is obtained from the system. The energy flux of electric energy (power) is measured by a wattmeter. Mechanical work can be exchanged with a system by means of a piston rod of reciprocal motion or with a rotating shaft. The energy balance of a system should comprise the mechanical work performed by all forces acting on system boundary. Therefore, if a substance flux passes through the boundary then the work performed by the force acting in the place of passing should be taken into account.

Detailed analyses confirming the independency of radiation exergy on emissivity of the environment, on the configuration of surrounding environment and on the presence of other surfaces of different temperatures, are gathered in the book by Petela (2010). 4. 35) is multiplication of bb,S by factor c0 /4, making bb = c0 · bb,S /4, based on purely geometric considerations and keeping in mind that σ = a × c0 /4, where c0 is the light velocity. 3) with interpretation of energy E and entropy S as respective emission eb and its entropy s.

Such equilibrium determines the reference state in calculation of the exergy of the photon gas. g. emissivities or transmissivities). The dominating temperature of the environment’s bodies can be assumed as the standard (averaged) environmental temperature T0 . As discussed previously the surface always emits black radiation, thus the environment surface at temperature T0 , regardless of the surface properties, emits black radiation at temperature T0 . The properties of the surface determine only the rate at which the emission occurs.

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Solar Power with 12 Volt Systems by Michel Deniek

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