Question

Your new engine design consists of a piston cylinder arrangement. The engine operates with mostly air...

Your new engine design consists of a piston cylinder arrangement. The engine operates with mostly air and a small amount of fuel. The system undergoes a cycle. The initial Pressure and temperature are p1= 1bar and T1= 27°C. The system undergoes a power cycle consisting of the following process:

Process 1-2                         constant volume to a pressure, P2 of 4 bars

Process 2-3                         expansion of pv=constant

Process 3-1                         constant-pressure compression

Draw the system and pv diagrams

If P2 is 4 bars, find T2. List assumptions

Using “cold” cp or cv data, find the heat added in kJ/kg during the constant volume process.

Use the ideal gas air table to find Δu for the constant volume process

Find the specific work for the expansion process

What process name is associated with the expansion process?

What is the total change in specific internal energy for the cycle?

Calculate the net specific work for the cycle

Calculate the thermal efficiency for the cycle

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state...
In a cylinder/piston arrangement, air is compressed in a reversible polytropic process to a final state of 800 kPa, 500 K. Initially air is at 110 kPa and 25oC. During the compression process heat transfer takes place with the ambient maintained at 25oC. Assume air as an ideal gas (R =0.287 kJ/kg) and has constant specific heats of Cp = 1.004 kJ/kgK and Cv = 0.717 kJ/kgK. If the mass of air in the cylinder is 0.1286 kg, determine a)...
A Student cycle engine is analyzed using the cold air-standard method. Given the definition of each...
A Student cycle engine is analyzed using the cold air-standard method. Given the definition of each process in the cycle, determine the thermal efficiency of the engine for each set of defined ratios listed below. All ratios are given as the larger value over the smaller one. --Given Values-- Process 1-2 = Isentropic compression & volume ratio=rv12 Process 2-3 = Isothermal compression & volume ratio=rv23 Process 3-4 = Isobaric heat addition & temperature ratio=rT34 Process 4-5 = Isometric heat addition...
A cylinder if fitted with a floating piston oriented horizontally (the air is the system and...
A cylinder if fitted with a floating piston oriented horizontally (the air is the system and by having a floating piston it maintains constant pressure). It contains 24.5 L of air at 25.0C and 1 bar pressure. The system is then heated to 250.0C. Air can be considered a diatomic gas and therefore would have a Cv = 5R/2, where R is the ideal gas constant. Also for gases Cp = Cv +R. How much work was done (in J)...
1. The compression ratio of an air powered diesel cycle is A = 18 and the...
1. The compression ratio of an air powered diesel cycle is A = 18 and the cutting ratio is B = 2.2. The pressure of the air at the beginning of the compression process is C = 94 kPa and the temperature is D = 32 ° C. Considering that the specific temperatures change with temperature (using the air standard, not the cold air standard only, that is, using the relative specific volumes from the table) and accepting the gas...
1) An ideal gas is contained in a piston-cylinder device and undergoes a power cycle as...
1) An ideal gas is contained in a piston-cylinder device and undergoes a power cycle as follows: 1-2 isentropic compression from an initial temperatureT1= 20 degree celsius with a compression ratio r = 5 2-3 constant pressure heat addition 3-1 constant volume heat rejection The gas has constant specific heats with cv = 0.7 kJ/kg·K and R= 0.3 kJ/kg·K. (a) Sketch the P-v and T-s diagrams for the cycle. (b) Determine the heat and work interactions for each pro-cess, in...
1. An engine operating at a hot-air standard (k=1.35) Dual Combustion Cycle handles air at 100kPa,...
1. An engine operating at a hot-air standard (k=1.35) Dual Combustion Cycle handles air at 100kPa, 34.5°C, & 0.3531m^3 during the beginning of the isentropic compression process. The engine has a percent clearance of 6.25% and an expansion ratio of 1.5 during the isentropic expansion process. It receives 165 kJ of heat during the constant volume process. What is the a.) Temperatures at different points of the cycle °C? b.) Net Work kJ? And c.) Mean effective pressure in kPa?
N moles of this gas undergoes the following cyclical process composed of four reversible steps: i....
N moles of this gas undergoes the following cyclical process composed of four reversible steps: i. Isovolumetric cooling from state 1 (T1 and P1) to State 2 (T2 and P2); ii. Isothermal expansion from state 2 (T2 and P2) to state 3 (T2 and P3); iii. Isovolumetric heating from state 3 (T2 and P3) back to state 4 (T4 and P4); and iv. Adiabatic compression from state 4 (T4 and P4) to state 1 (T1 and P1). We know that...
Carbon dioxide (CO2) gas in a piston-cylinder assembly undergoes three processes in series that begin and...
Carbon dioxide (CO2) gas in a piston-cylinder assembly undergoes three processes in series that begin and end at the same state (a cycle). Process 1–2: Expansion from state 1 where p1 = 10 bar, V1 = 1 m3, to state 2 where V2 = 4 m3. During the process, pressure and volume are related by pV1.5 = constant. Process 2–3: Constant volume heating to state 3 where p3 = 10 bar. Process 3–1: Constant pressure compression to state 1. Sketch...
A cylinder if fitted with a floating piston oriented horizontally (the air is the system and...
A cylinder if fitted with a floating piston oriented horizontally (the air is the system and by having a floating piston it maintains constant pressure). It contains 24.5 L of air at 25.0C and 1 bar pressure. The system is then heated to 250.0C. Air can be considered a diatomic gas and therefore would have a Cv = 5R/2, where R is the ideal gas constant. Also for gases Cp = Cv +R. If you make assumptions to solve they...
One kg of water in a piston-cylinder assembly undergoes two processes in series from an initial...
One kg of water in a piston-cylinder assembly undergoes two processes in series from an initial state where p1 = 0.8 MPa, T1 = 500°C: Process 1-2: Constant-pressure compression until the volume is half of the initial volume. Process 2-3: Constant-volume cooling until the pressure drops to 400 kPa. Sketch the two processes in series on a p-v and T-v diagram. Determine the work and heat transfer for both processes.