Question

2. An engine takes in air at 100kPa, 20°C. The maximum cycle pressure is 6900kPa. The compression ratio is 18:1. Calculate, based on the dual cycle, the thermal efficiency of the engine. Assume that the heat addition at constant volume is equal to the heat addition at constant pressure. Use constant specific heat properties ($k = 1.4$; $c_v = 0.718kJ/kg/K$; $c_p$ $= 1.005kJ/kg/K$; $R = 0.287kJ/kg/K$)

          2. An engine takes in air at 100kPa, 20°C. The maximum cycle pressure is 6900kPa. The
compression ratio is 18:1. Calculate, based on the dual cycle, the thermal efficiency of
the engine. Assume that the heat addition at constant volume is equal to the heat addition
at constant pressure. Use constant specific heat properties ($k = 1.4$; $c_v = 0.718kJ/kg/K$; $c_p$
$= 1.005kJ/kg/K$; $R = 0.287kJ/kg/K$)

2. An engine takes in air at 100kPa, 20°C. The maximum cycle pressure is 6900kPa. The
compression ratio is 18:1. Calculate, based on the dual cycle, the thermal efficiency of
the engine. Assume that the heat addition at constant volume is equal to the heat addition
at constant pressure. Use constant specific heat properties (k = 1.4; cv = 0.718kJ/kg/K; cp
= 1.005kJ/kg/K; R = 0.287kJ/kg/K)

Added by Enrique A.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Sparsha S

Step 1

First, we need to calculate the specific heat capacity at constant volume (Cv) using the given values of R and the compression ratio (CR). Cv = R / (γ - 1) where γ is the specific heat ratio, which is given by γ = 1 + (1 / CR) γ = 1 + (1 / 18) = 1.0556 Cv = Show more…

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1.005 kJ/kg/K, R = 0.287 kJ/kg/K the engine. Assume that the heat addition at constant volume is equal to the heat addition compression ratio is 18:1. Calculate, based on the dual cycle, the thermal efficiency of.