Question: 1 ) A 4 cylinder engine runs at 3 6 0 0 rpm with a compression ratio of 5 using the following cycle: State
A cylinder engine runs at rpm with a compression ratio of using the following cycle:
State rightarrow State : Air at kPa and K is compressed isothermally from a volume of L down to its minimum volume. The initial entropy is mathrmkjmathrmkgmathrmkNot isentropic
State mathbfrightarrow State : The air is instantaneously heated to K
State rightarrow State : The air is expanded isothermally back up to the bottom dead center Not isentropic
State mathbfrightarrow State : The air is cooled instantaneously back down to K
We are now stepping up the HW assignment quality. The standard is that someone not in the class could read your work and understand it Solve this question by hand. Use cvmathrm~kJmathrmkgmathrmK Rmathrm~kJmathrmkgmathrmK and k
a points Draw the system, find the mass in the system, as well as the minimum volume mathrmdsa top dead center and the maximum volume bottom dead center
b points Sketch solution of one cycle in a PV Big volume and a Ts for guidance and identify the processes.
c points For each state show your control volume, and list all the state variables. mathrmPmathrm~T s u VHint: "Big" V not specific volume And for each process show your energy equation, and list what stays constant between each state and its following state. ie: what stays constant between rightarrow rightarrow ldots
d Work and Heat
i points Find the isentropic work, and specific work from State to
ii points Find the total and specific heat input from State to
iii points Find the isentropic work, and specific work from State to
iv points Find the total and specific heat output from State to
v points Find the net work using the isothermal work out and work in to the system, and thermal efficiency Hint: use the isothermal work equation
e points Using the net work you found in the previous question, what is the power output of the engine, in KW What is the mean effective pressure MEP
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