1. Chapter Four: Energy transfer by Heat, Work and Mass

3. Heat Transfer Mechanisms

12. Example 1

13. Example 2

15. Example 3

20. Example 4

22. Example 5

29. Example 6

31. Example 7

36. Example 8
R-134a
compressor 2
0.8 MPa
50C 1
0.14 MPa

37. Refrigerant-134a enters a compressor as a saturated vapor at a specified pressure, and leaves as superheated vapor at a specified rate. The rates of energy transfer by mass into and out of the compressor are to be determined.
Assumptions 1 The flow of the refrigerant through the compressor is steady. 2 The kinetic and potential energies are negligible, and thus they are not considered.
Properties The enthalpy of refrigerant-134a at the inlet and the exit are (Tables A-12 and A-13)

38. Analysis Noting that the total energy of a flowing fluid is equal to its enthalpy when the kinetic and potential energies are negligible