Thermal properties (thermal conductivity, specific heat, Prandtl number, density) of saturated water and saturated vapor) are tabulated as a function of temperature. Since water is an incompressible fluid, use the thermal properties of saturated liquid for all compressed liquid water at the temperature of the fluid.
Be VERY CAREFUL about the thermal properties of saturated vapor, however. Recognize that “saturated vapor” at a specified temperature implies both the temperature and saturation pressure. Thermodynamic properties such as density depend on both P and T.
This Excel file illustrates how to estimate an automobile’s coefficient-of-drag, determine rolling resistance (based on weight and tire pressure), and ultimately the power required for operation on level ground. A comparison is made between costs for operating a fuel-powered engine drive or an electric drive.
This macro-enabled (xlsm) Excel file uses custom steam property evaluations to illustrate how selected steam-related equipment is analyzed. Worked-out example problems enable the user to modify the input model values. Equipment examples provided are: boiler, pump, steam turbine, pressure reducing valve, desuperheater, condenser, closed feedwater heater, open feedwater heater, flash tank, air-to-water heat exchanger (economizer).
What does a steam vapor dome look like, to scale, on a P-v diagram?
What does a steam vapor dome look like, to scale, on a T-s diagram?
This file answers those questions and demonstrates how to generate a water/steam vapor dome, to scale, in Excel. This enables you to Save As… and begin your own project work and problem-solving work without starting from scratch.
This file has been created to demonstrate how to analyze a basic Rankine steam power plant cycle with a superheated vapor steam turbine throttle (inlet) condition. Each cycle component is analyzed in a separate Excel tab, and the tabs are interlinked by a “master tab” that puts together the four components: boiler, turbine, condenser, feedwater pump.
The user has the ability to adjust the turbine inlet conditions and the condenser pressure. The user has the ability to define the isentropic turbine and pump efficiencies. The cycle analysis culminates with the determination of the cycle’s thermal efficiency. The user can study how variations in the input values affect the plant’s thermal efficiency.
Steam properties are evaluated automatically, using English thermodynamics properties tables imbedded in the file, along with an automated interpolation scheme needed in the analysis.
What does an isobar curve (line of constant pressure) look like for an ideal gas with constant specific heat look like on a T-s (temperature-entropy) diagram? In class, we draw an upward sloping curve, by hand. This file quantifies, graphically, how to plot an isobar curve to-scale.
Also illustrated and quantified, for an ideal gas with constant specific heat, are T-s isochor curve (line of constant specific volume) and P-v isotherm (line of constant temperature) .
This Excel tool works out the “energy balance” (first law of thermodynamics) for a steady state steady flow open system with fuel-and-air (reactants) entering and exhaust gas (products) leaving. This file contains a full table of enthalpy-of-formation for various hydrocarbon fuels, and enthalpy values for various gases as a function of temperature. Both these tables are needed for the energy balance. The tables in this file are in the SI system of units.
This Excel tool works out the “energy balance” (first law of thermodynamics) for a steady state steady flow open system with fuel-and-air (reactants) entering and exhaust gas (products) leaving. This file contains a full table of enthalpy-of-formation for various hydrocarbon fuels, and enthalpy values for various gases as a function of temperature. Both these tables are needed for the energy balance. The tables in this file are in the English system of units.
