Problems and Solutions
Chapter 6
Caloric Properties
Textbook Examples:
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06.01
Calculation Error on Property Model Change
06.02
Required Mass Flow Through Safety Valve
06.03
Heat Exchanger Duty Using Different Calculation Routes
06.04
Combustion of Liquid n-Butanol for Steam Generation
06.05
Standard Gibbs Energy of Formation of Hydrogen Chloride
06.06
Deacon Reaction in a Flue Gas
06.07
Deacon Reaction in a Flue Gas by G-Minimization
Additional Problems:
P06.01 Enthalpy of a Liquid
Stream
A process simulation
software reports the enthalpy of a saturated liquid stream of 53 kg/h of
cyclohexane at 45°C as -2.301 Gcal/h. Estimate this value using
the data given in Appendix A ad B and compare the results.
P06.02 Cooling
Duty after Oxyhydrogen Gas Reaction
How much heat per mol of water must be removed to reach a final
temperature of
T = 1000 K when the oxyhydrogen gas reaction
H2 + 0.5 O2
H2O
is performed? Use the ideal gas equation of state and the physical
properties from Appendix A. The starting temperature Tstart =
400 K. Assume stoichiometric composition and total conversion.
P06.03 Enthalphy
Change of Water Upon Heating Using Two Routes (A, B)
Calculate the enthalpy difference when pure liquid water at P = 1
bar is heated up from
J1 = 20°C to
J2 = 70°C using
both Route A and Route B (see Chapter 6.2). Which is the better option?
Use the Peng-Robinson equation of state for the vapor phase.
P06.04
Enthalpy of Vaporization of Propylene Using Route B
Calculate the enthalpy of vaporization of liquid propylene at
J1 = -100°C,
J2 = 0°C,
J3 = 50°C,
J4 = 70°C and
J5 = 90°C using
Route B (see Chapter 6.2). Use the Peng-Robinson equation of state for
the vapor phase. Up to which temperatures can Route B be regarded as a
useful option?