FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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6. Five pounds of a certain ideal gas with K 1.30 and R= 35
is compressed in
%3D
polytropic process in a closed system from 15 psia, 80 F to 60psia, 315 F. Compute
the polytropic index n, the work nonflow and the heat interactions with the
surroundings
If 528 kJ of heat are added to 2.25 kg of helium at constant volume process when the initial temperature is 40 deg. C, find:
the change in enthalpy in kJ
869.5
889.5
879.5
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- How much entropy is transferred if 200 W of thermal energy are transferred to a heat sink at 300K?arrow_forward10 kg of an ideal gas that is going through a large temperature change from 27degC to 1127degC while pressure increases from 100 kPa to 1000kPa. Find the change in S. This is a bit larger delta T where you can assume constant specific heats. Approximate using a midpoint value of C, for air to approximate. Compare to the answer by using the IRC or NIST databases. How different are the two approaches?arrow_forwardSteam is expanded from an initial state of 1300 kPa and 410 deg C to a final state of 102 kPa and 95 deg C. Estimate AH and AS using Steam Table, RK and generalized compressibility factor.arrow_forward
- Air at 1000 Co, 1.0 MPa expands in a polytropic process with n = 1.3 to a pressure of 250 kPa. Find 1- the final temperature 2- the specific work outputarrow_forward1. Kittel Ch3-1. Free energy of a two state system. (a) Find an expression for the free energy as a function of 7 of a system with two states, one at energy 0 and one at energy E. (b) From the free energy, find expressions for the energy and entropy of the system. The entropy is plotted in Figure 3.11.arrow_forwardTwo kilograms of Methane gas underwent an isopiestic process from 200C to 300C. Find the change in internal energy, change in enthalpy, work done and heat transferred. Sketch the T-s and P-v diagrams.arrow_forward
- An amount of 4000 BTU of heat is transferred from a reservoir at 800 deg. F to a reservoir at 200 deg. F. Find the entropy change of the system.arrow_forwardSpecial Home Work A tank of 2m' volume contains saturated ammonia at a temperature of 40°C, the tank contains 50% liquid and 50% vapour by volume. Find the specific volume, enthalpy, and internal energy of the mixture. (3.369x10 m/kg, 232908kJ, 229816KJ).arrow_forwardFour kilograms per second of Methane is compressed isentropically from 104.3 kPa, 140 degree Fahrenheit to 440.6 degree Fahrenheit. Assuming that the process is for ideal gas, find: Final Pressure, torr Change in entropy Work, HParrow_forward
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What is entropy? - Jeff Phillips; Author: TED-Ed;https://www.youtube.com/watch?v=YM-uykVfq_E;License: Standard youtube license