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102402_rec7

# 102402_rec7 - c Determine the work output of the cycle d...

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16.050 Thermal Energy Recitation #7 – Fall 2002 Problem 1: An ideal dual combustion cycle, or dual cycle, consists of the following 5 processes (plus the intake and exhaust strokes): 1 => 2 Adiabatic and reversible compression 2 => 3 Constant volume heat addition 3 => 4 Constant pressure heat addition 4 => 5 Adiabatic and reversible expansion 5 => 1 Constant volume heat rejection State 1 for a dual combustion engine is P 1 =1 bar and T 1 =330 K; r=18; at the end of the constant volume combustion process, P 3 =75 bar; r c =1.5. Assume 1 kg of perfect gas air is the working fluid with cp=1 kJ/kgK. a) Sketch the P-V diagram for the cycle. b) Find P, V, and T for states 1-5.

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Unformatted text preview: c) Determine the work output of the cycle. d) Find the thermal efficiency of the cycle. Page 1 of 1 Problem 2: The following device operates at steady-state and is well insulated. Air enters at one location and exits at another with a mass flow rate of 10 kg/s. Assuming perfect gas behavior and negligible potential energy effects, determine the direction of the air flow and the direction of the power flow. Determine the power in kW. Assume cp=1000 J/kgK for air. (Hint: it might be useful to initially assume directions of the different energy fluxes and then to check for consistency.) Page 2 of 2...
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102402_rec7 - c Determine the work output of the cycle d...

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