The table shows information about two cities.
information about miami, florida and providence, rhode island
miami, florida providence, rhode island
elevation (meters)
18
latitude (n)
about 26
about 42
what can you infer about the temperature of these two cities?
miami, florida, would have colder temperatures because it has a lower elevation.
miami, florida, would have warmer temperatures because it is nearer to the equator.
o providence, rhode island, would have warmer temperatures because it has a higher elevation.
providence, rhode island, would have warmer temperatures because it is farther from the equator.
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As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.