A new vehicle propulsion scheme calls for the use of liquid nitrogen as “fuel.” The details of the..

A new vehicle propulsion scheme calls for the use of liquid
nitrogen as “fuel.” The details of the power cycle are not the issue here (in
brief, the liquid nitrogen is heated in contact with the atmosphere,
pressurized, and expanded through the turbine that drives the vehicle).
Calculate the maximum work that could theoretically be extracted from the
liquid nitrogen fuel. During each refueling stop, the driver purchases a Dewar
vessel (a bottle) containing 0.05 m3 of liquid nitrogen at atmospheric
pressure. The driver leaves in exchange a used bottle, that is, a bottle
containing gaseous N2
»

A new vehicle propulsion scheme calls for the use of liquid
nitrogen as “fuel.” The details of the power cycle are not the issue here (in
brief, the liquid nitrogen is heated in contact with the atmosphere,
pressurized, and expanded through the turbine that drives the vehicle).
Calculate the maximum work that could theoretically be extracted from the
liquid nitrogen fuel. During each refueling stop, the driver purchases a Dewar
vessel (a bottle) containing 0.05 m3 of liquid nitrogen at atmospheric
pressure. The driver leaves in exchange a used bottle, that is, a bottle
containing gaseous N2 at atmospheric pressure and temperature. The
properties of nitrogen as saturated liquid at 1 atm are v = 1.24 × 10_3
m3_kg, h = _121.5 kJ_kg, and s = 2.85 kJ_kg _ K. The corresponding
properties of nitrogen at atmospheric temperature and                 pressure
(300 K, 1 atm) are v = 0.49 m3_kg, h = 172.1 kJ_kg, and
s = 6.25 kJ_kg _
K.

»