Assume constant specific heats 762 a 15 m3 insulated

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 0.169 kJ/K 7–52 Reconsider Prob. 7–51. Using EES (or other) software, study the effect of the mass of the iron block on the final equilibrium temperature and the total entropy change for the process. Let the mass of the iron vary from 1 to 10 kg. Plot the equilibrium temperature and the total entropy change as a function of iron mass, and discuss the results. 7–61 Oxygen gas is compressed in a piston-cylinder device from an initial state of 0.8 m3/kg and 25°C to a final state of 0.1 m3/kg and 287°C. Determine the entropy change of the oxygen during this process. Assume constant specific heats. 7–62 A 1.5-m3 insulated rigid tank contains 2.7 kg of carbon dioxide at 100 kPa. Now paddle-wheel work is done on the system until the pressure in the tank rises to 120 kPa. Determine the entropy change of carbon dioxide during this process Answer: 0.323 kJ/K in kJ/K. Assume constant specific heats. CO2 1.5 m3 100 kPa 2.7 kg 7–53 A 50-kg iron block and a 20-kg copper block, both initially at 80°C, are dropped into a large lake at 15°C. The...
View Full Document

This document was uploaded on 11/28/2012.

Ask a homework question - tutors are online