# The Second Law of Thermodynamics (SL)

### Entropy and The Second Law of Thermodynamics

• Explain and manipulate the second law [Ch 3.3-3.6]
• State and illustrate by example the second law of thermodynamics
• Write both the integral and differential forms of the second law
• Identify when the open and closed forms of the second law are applicable
• Determine when each term in the second law is zero or negligible
• Identify, formulate, and solve simple engineering problems (such as expansion/compression and power cycles) [Ch 3.5-3.9]
• Derive and use the mechanical energy balance equation to solve engineering problems [Ch 3.8]
• Devise and use strategies for entropy change calculations
• Develop hypothetical reversibile paths between two states in order to calculate entropy changes [Ch 3.1-3.2]
• Use the heat capacity to calculate entropy changes
• Use tables to calculate entropy changes
• Calculate entropy changes for materials undergoing phase changes and/or reaction
• Perform power cycle problems [Ch 3.9]
• Solve for the net power obtained and efficiency of reversible power cycles
• Calculate the coefficient of performance of a reversible refrigeration cycle
• Correct reversible calculations for real systems using isentropic efficiencies