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For each of the cases below determine if the heat engine satisfies the first law (energy equation) and if it violates the second law.
For B > 0, prove that at every point of a single-phase region of an h-s diagram, the slope of a constant pressure (P = constant) line is greater
For an ideal gas obtain an expression for the ratio of the velocity of sound where Ma = 1 to the speed of sound based on the stagnation temperature
Ethene, C2H4, burns with 150% theoretical air in an SSSF constant-pressure process with reactants entering at P0, T0. Find the adiabatic flame temperature
Electrical appliances (TV, stereo) use electric power as input. What happens to the power? Are those heat engines?
Refrigerant-134a enters an adiabatic compressor as saturated vapor at 160 kPa at a rate of 2 m3/min and is compressed to a pressure of 900 kPa
Find the expression for the ratio of the stagnation pressure after a shock wave to the static pressure before the shock wave as a function of k
Find the entropy for the following water states and indicate each state on a T-s diagram relative to the two-phase region.
Fifteen kg of the carbon dioxide (CO2) gas is fed to a cylinder having a volume of 20 m3 and initially containing 15kg of CO2 at a pressure of 10bar
During a heating process, the temperature of an object rises by 20°C. This temperature rise is equivalent to a temperature rise of. You should solve the problem
During a heat transfer process, the entropy change of incompressible substances, such as liquid water, can be determined
Due to a faulty door contact the small light bulb (25 W) inside a refrigerator is kept on and limited insulation lets 50 W of energy from the outside seep
Dry air is heated from 25°C to 4000 K in a 100-kPa constant-pressure process. List the possible reactions that may take place and determine the equilibrium
Does the cyclic integral of work have to be zero (i.e., does a system have to produce as much work as it consumes to complete a cycle)? Explain.
During the isothermal heat addition process of a Carnot cycle, 900 kJ of heat is added to the working fluid from a source at 400°C. Determine
During some actual expansion and compression processes in piston-cylinder devices, the gases have been observed to satisfy the relationship
During an expansion process, the pressure of a gas changes from 15 to 100 psia according to the relation P = aV + b, where a = 5 psia/ft3 and b is a constant.
During a regeneration process, some steam is extracted from the turbine and is used to heat the liquid water leaving the pump.
During a picnic on a hot summer day, all the cold drinks disappeared quickly, and the only available drinks were those at the ambient temperature of 75°F.
Electric power is to be generated in a hydroelectric power plant that receives water at a rate of 70 m3/s from an elevation of 65 m using a turbine-generator
Also determine the Mach number of an aircraft moving in air at a velocity of 280 m/s for both cases.
Develop an expression for the variation in temperature with pressure in a constant entropy process, (T/P)s, that only includes the properties P-v-T
Determine the specific volume of superheated water vapor at 10 MPa and 400°C, using
Does the amount of heat absorbed as 1 kg of saturated liquid water boils at 100°C have to be equal to the amount of heat released as 1 kg of saturated
Differences in surface water and deep water temperature can be utilized for power generation. It is proposed to construct a cyclic heat engine that will operate