Consider a steam engine that operates between 550 1 = T °C and 250 2 = T °C. 1°/Recall the definition of the efficiency of heat engines. 2°/ Express as a function of the quantities of heat Qlet Q2 exchanged by the gas with the hot and cold sources at the temperatures Tlet T2 respectively. 3°/Give the expression of this efficiency in the case of a reversible dithermal cycle according to the temperatures of the problem. In practice, such a motor will have an efficiency of 70% of this maximum efficiency. How much is it numerically worth?
Consider a steam engine that operates between 550 1 = T °C and 250 2 = T °C. 1°/Recall the definition of the efficiency of heat engines. 2°/ Express as a function of the quantities of heat Qlet Q2 exchanged by the gas with the hot and cold sources at the temperatures Tlet T2 respectively. 3°/Give the expression of this efficiency in the case of a reversible dithermal cycle according to the temperatures of the problem. In practice, such a motor will have an efficiency of 70% of this maximum efficiency. How much is it numerically worth?
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Transcribed Image Text:Consider a steam engine that operates between 550 1 = T °C and 250 2 = T °C.
1°/Recall the definition of the efficiency of heat engines.
2°/ Express as a function of the quantities of heat Qlet Q2 exchanged by the gas with the hot
and cold sources at the temperatures Tlet T2 respectively.
3°/Give the expression of this efficiency in the case of a reversible dithermal cycle according to
the temperatures of the problem. In practice, such a motor will have an efficiency of 70% of this
maximum efficiency. How much is it numerically worth?
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