I have a confusion about something in the following question.
An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95 kPa and 20C. If the maximum temperature in the cycle is not to exceed 2200 K, determine (a) the thermal efficiency and (b) the mean effective pressure. Assume constant specific heats for air at room temperature. An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95 kPa and 20°C. If the maximum temperature in the cycle is not to exceed 2200 K, determine (a) the thermal efficiency and (b) the mean effective pressure. Assume constant specific heats for air at room temperature.
When I'm calculating here qin$q_{\mathrm{in}}$, I know qin=h3-h2=cp(T3-T2): $$q_{\mathrm{in}}=h_3-h_2=c_p (T_3-T_2)$$
However, when I get the values from the table about ideal gas and calculate h3-h2$h_3-h_2$, I get different answer compared to cp(T3-T2)$c_p(T_3-T_2)$.Why
Why is it like that? They mustMustn't them be equal?! or I'm Or am I missing an important point about the equation qin=h3-h2=cp(T3-T2).I wrote? I'd be grateful if you could help me clear up my confusion here. Looking forward to hearing from you
