ass6 - ENGRD 221 ENGINEERING THERMODYNAMICS Problem Set 6...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 6 Due: March 6 th 2009, Upson Room 123 (5 Questions) Question 1 (MS 5.88) : The figure below shows a system consisting of a power cycle driving a heat pump. At steady state, the power cycle receives s Q & , by heat transfer at T s from the high-temperature source and delivers 1 Q & to a dwelling at T d . The heat pump receives o Q & from the outdoors at T o and delivers 2 Q & to the dwelling. Using Eq. 5.13, obtain an expression for the maximum theoretical value of the performance parameter () 12 / s QQ Q + && & in terms of the temperature ratios T s / T d and T o / T d . Question 2 (MS 6.8) : Using the appropriate table, determine the indicated property for a process in which there is no change in specific entropy between state 1 and state 2. (a) water, p 1 = 14.7 lbf/in. 2 , T 1 = 500°F, p 2 = 100 lbf/in. 2 Find T 2 in °F. (b) water, T 1 = 10°C, x 1 = 0.75, saturated vapor at state 2. Find p 2 in bar. (c) air as an ideal gas, T 1 = 27°C, p 1 = 1.5 bar, T 2 = 127°C. Find p 2 in bar. (d) air as an ideal gas, T 1 = 100°F, p 1 = 3 atm, p 2 = 2 atm. Find T 2 in °F. (e) Refrigerant 134a, T 1 = 20°C, p 1 = 5 bar,

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ass6 - ENGRD 221 ENGINEERING THERMODYNAMICS Problem Set 6...

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