Chapter Four: Energy transfer by Heat, Work and Mass

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Presentation transcript:

Chapter Four: Energy transfer by Heat, Work and Mass

Heat Transfer Mechanisms

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

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

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)

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