The integral of dqt along an irreversible path is not

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: path between the two states. The integral of dQ/T along an irreversible path is not a property, and in general, different values will be obtained when the integration is carried out along different irreversible paths. Therefore, even for irreversible processes, the entropy change should be determined by carrying out this integration along some convenient imaginary internally reversible path between the specified states. T 0.3 S2 S, kJ/K FIGURE 7–3 The entropy change between two specified states is the same whether the process is reversible or irreversible. A Special Case: Internally Reversible Isothermal Heat Transfer Processes Recall that isothermal heat transfer processes are internally reversible. Therefore, the entropy change of a system during an internally reversible isothermal cen54261_ch07.qxd 11/18/03 9:57 AM Page 277 277 CHAPTER 7 heat transfer process can be determined by performing the integration in Eq. 7–5: 2 S 1 Q T 2 int rev 1 Q T0 int rev 1 T0 2 1 (dQ)int rev which reduces to S Q T0 (kJ/K) (7–6) where T0 is the constant absolute temperature of the system and Q is the heat transfer for the internally reversib...
View Full Document

This document was uploaded on 11/28/2012.

Ask a homework question - tutors are online