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hw01-hints

# hw01-hints - ABE 484/584 CHOI HW1 1 Fundamentals of...

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ABE 484/584 CHOI HW1 1. Fundamentals of Thermodynamics (1) Write three different modes of convective heat transfer. Explain the mechanism (driving force and/or cause) of each mode briefly. (2) Define specific enthalpy ( h ) in terms of specific internal energy ( u ), pressure ( p ), and specific volume ( υ ). (3) Write the mass rate balance equation for control volumes with multiple inlets and exits. (4) Write the energy rate balance equation for control volumes with multiple inlets and exits. Use the sign convention introduced in the class (QEW). (5) Estimate an efficiency of a Carnot cycle heat engine operating between 1540 o F and 440 o F. (6) An inventor claims to have developed a power cycle capable of delivering a net work output of 410 kJ for an energy input by heat transfer of 1000 kJ. The system undergoing the cycle receives the heat transfer from hot gases at a temperature of 500 K and discharges energy by heat transfer to the atmosphere at 300 K. Evaluate this claim. Department of Agricultural and Biosystems Engineering, The University of Arizona

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ABE 484/584 CHOI (7) A Carnot cycle heat engine operates between 1540 o F and 40 o F and rejects 250 Btu/lb to the low temperature reservoir or heat sink. Estimate the maximum entropy change in Btu/lb∙ o R of the working fluid for any process in the cycle. (8) Complete the table for polytropic processes (p υ n =constant). Hints: Processes – isothermal, isomeric, isobaric, and isentropic n = 0, 1, k (specific heat ratio), and ±∞ Line Corresponding Process n a b c d Department of Agricultural and Biosystems Engineering, The University of Arizona p υ a b T s c d
ABE 484/584 CHOI (9) The dry and wet bulb temperatures are at 80°F and 67°F. Estimate the corresponding relative humidity and dew point temperature using the following psychrometer.

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