#PISTON CYLINDER THERMODYNAMICS CALCULATOR SOFTWARE#

#PISTON CYLINDER THERMODYNAMICS CALCULATOR SOFTWARE#

EES software or a Molier diagram can be used. Write a balance equation and determine the temperature and relative humidity of air for the mixed stream, entropy generation, exergy destruction and second law efficiency for the mixer. 1.21Ĭonsider adiabatic mixing of 10 g/s moist air at 25☌ with relative humidity of 60% with 2 g/s of moist air at 10☌ with relative humidity of 40%. Write a balance equation and calculate the first and second law efficiency and exergy destruction of the combustion chamber. Assume a complete combustion of natural gas modeled as methane. In a combustion chamber, natural gas is supplied at 10 atm, while air comes in an excess ratio of 5. Write balance equations and calculate exergy efficiency of the turbine. The isentropic efficiency of the turbine is 0.8. 1.19Ī turbine expands superheated steam at 10 MP having a superheating degree of 50 K. Write mass, energy, entropy and exergy balances for the following devices: (a) an adiabatic steam turbine (b) an air compressor with heat loss from the air to the surroundings (c) an adiabatic nozzle and (d) a diffuser with heat loss to the surroundings.

Noting that heat transfer does not occur without a temperature difference and that heat transfer across a finite temperature difference is irreversible, is there such a thing as reversible heat transfer? Explain. 1.16ĭoes an exergy analysis replace an energy analysis? Describe any advantages of exergy analysis over energy analysis. Calculate the entropy generation and exergy destruction per unit of wall surface. Write balance equations for a building wall assuming that exterior temperature is 5☌, interior temperature is 25☌, the wall thermal conductivity is 1 W/mK, and the heat transfer coefficient is 10 W/m 2K on both sides. 1.14Ĭalculate chemical exergy of octane based on standard exergy of the elements. Calculate the amount of reversible work needed to separate carbon dioxide. Stack gas of a power plant comprises 15% carbon dioxide by volume and the rest is made of other gaseous combustion products. Calculate the total exergy stored in the cistern. 1.12Ī cistern vehicle transports 20 t of propane and runs with 80 km/h, being exactly in the top of a hill of 100 m altitude. Assume standard values for temperature and pressure of the environment. Using thermodynamic tables or EES software, calculate the thermomechanical exergy of saturated steam at 16 MPa.

What is the relationship between entropy change of a system, of its surroundings and of generated entropy? 1.11

What is the difference between externally reversible and internally reversible processes? 1.10 1.8ĭefine the notion of adiabatic process and explain the role of expansion coefficient for determining the work exchange during this type of process. 1.7Įxplain the difference between internal energy and enthalpy.

How much is the value of compressibility factor for ideal gas? 1.6ĭerive the equation for mechanical work during an isothermal transformation of ideal gas. What is the difference between thermal and caloric equation of state? 1.5Įxplain the principle of corresponding states. What is the relationship between temperature and kinetic energy of molecules? 1.4 1.2Įxplain the difference between closed and open thermodynamic systems. Explain the difference between flow work and boundary work.

Piston cylinder thermodynamics calculator