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TERMODINÀMICA (Curs Total)
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For a given compression ratio, which engine is more efficient: Diesel or petrol (Otto cycle)?
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Write the Carnot's theorems
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What is the bypass ratio of a turbofan? Enumerate the advantages of turbofans over turbojets.
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Plot the Otto's cycle in the p-v diagram. Relate the processes with the four stokes (intake, compression, power, exhaust)
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A vapour train is running in the desert. The temperature of its boiling chamber is constant. Will it have the same thermodynamic efficiency during the day than during the night? If not, when will it be higher?
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The entropy of a gas flowing through a throttling valve increases, decreases or remains constant?
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Let's compare the Otto and Diesel cycles. Which process is different between them? Why?
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Two identical closed thermodynamic systems (A and B) are in the same thermodynamic state (1). Both of them execute a process in which they perform mechanical work and arrive to the same thermodynamic state (2), different than 1. However, A executes a reversible process, while B executes an irreversible process. Is there enough information to know which process performs more mechanical work? If so, say which one.
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Write dimensions and units
of the thermal convection coeffcient.
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A refrigerator is running with its door open in a hermetically closed, thermally insulated room. After one day of running, the temperature of the room will have decreased remain constant or increase?
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