A thermodynamic cycle consists of three processes. The physical cycle is a piston/cylinder system containing air...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A thermodynamic cycle consists of three processes. The physical cycle is a piston/cylinder system containing air at the starting condition of T=300 K, P=100 kPa, and V=1 m³. The three processes are: i) The air is compressed to V=0.25 m³ in a process that keeps the internal energy, U, constant (State 1 to State 2). ii) The air is heated at constant volume until the pressure is 728.23 kPa (State 2 to State 3). iii) The air is expanded in a polytropic process (PV1.431-constant) to the original state (State 3 to State 1). First, what makes this a cycle? The key point is that it starts and ends at the same point. Hint: Note that air is an ideal gas here and that means that PV/T=constant if the mass is constant. (a) Fill in the following table. In Thermofluids, use air rather than air*¹: P (kPa) v (m³/kg) T(K) State 1 2 3 (b) Next, fill in the following table: Process 1-2 2-3 3-1 w (kJ/kg) q (kJ/kg) u (kJ/kg) Au (kJ/kg) (c) Do you see anything unusual about Process 3-1? If you had to characterize the thermal behavior of the walls during this process, what could you say? (d) Compare the net work over the cycle with the net heat transfer (i.e., how does net q going in compare with net w going out)? (e) Find the cycle efficiency = w,net/q,in (don't include q,out here) A thermodynamic cycle consists of three processes. The physical cycle is a piston/cylinder system containing air at the starting condition of T=300 K, P=100 kPa, and V=1 m³. The three processes are: i) The air is compressed to V=0.25 m³ in a process that keeps the internal energy, U, constant (State 1 to State 2). ii) The air is heated at constant volume until the pressure is 728.23 kPa (State 2 to State 3). iii) The air is expanded in a polytropic process (PV1.431-constant) to the original state (State 3 to State 1). First, what makes this a cycle? The key point is that it starts and ends at the same point. Hint: Note that air is an ideal gas here and that means that PV/T=constant if the mass is constant. (a) Fill in the following table. In Thermofluids, use air rather than air*¹: P (kPa) v (m³/kg) T(K) State 1 2 3 (b) Next, fill in the following table: Process 1-2 2-3 3-1 w (kJ/kg) q (kJ/kg) u (kJ/kg) Au (kJ/kg) (c) Do you see anything unusual about Process 3-1? If you had to characterize the thermal behavior of the walls during this process, what could you say? (d) Compare the net work over the cycle with the net heat transfer (i.e., how does net q going in compare with net w going out)? (e) Find the cycle efficiency = w,net/q,in (don't include q,out here)
Expert Answer:
Related Book For
Fundamentals Of Thermal-Fluid Sciences
ISBN: 9781260716979
6th Edition
Authors: Yunus Cengel, John Cimbala, Afshin Ghajar
Posted Date:
Students also viewed these accounting questions
-
Why do U.S. companies such as LYFT and LEVI choose to go public and not stay private? Once the company goes public, why do they choose to be listed on that particular market (physical exchange market...
-
An air-standard cycle is executed within a closed piston-cylinder system and consists of three processes as follows: 1-2 V = constant heat addition from 100 kPa and 27oC to 700 kPa 2-3 Isothermal...
-
Consider air (ideal gas) within a pistoncylinder assembly as a thermodynamic system. We wish to compare three different quasi-equilibrium expansion processes for this system by plotting the pressure...
-
Why is there currently an even greater need for effective employee communications?
-
Label this diagram of the reproduce system. n. b. C. d. h.
-
When the country's economy is expanding, AB Investment Company is optimistic and expects a MARR of 15% for new investments. However, in a receding economy the expected return is 8%. Normally a 10%...
-
9. This case concerns unequal taxes on property. In Pennsylvania, a county tax commissioner appraises land, meaning that he sets a value for the land, and the owner then pays real estate taxes based...
-
For each of the following procedures taken from the quality control manual of a CPA firm, identify the applicable element of quality control from Table 2-4. a. Appropriate accounting and auditing...
-
Problem 1 - Garfield's Lasagna Factory On October 1, 2021 , Garfield Ltd . ordered lasagna production machinery from a supplier in Italy for 6500,000 . The machinery was delivered on November 30,...
-
Able and Body are unrelated individuals. In September of the present year, they decide to form I Can Too Corporation. Able contributes a building and land with a basis of $35,000 and and a fair...
-
Discuss the reasons and potential benefits of government intervention in credit markets to support small businesses in Sub-Saharan Africa. Evaluate the challenges and potential risks associated with...
-
The Soccer Investment Center of Nike manufactures and sells soccer hats and soccer balls. The Soccer Hats Profit Center incurs the following costs for the production of a single soccer hat when...
-
Prepare a brief (i.e. less than three-quarters of a page) memo addressed to Melissa suggesting the type of audit opinion that should be given and explain why you have chosen that opinion. Ensure that...
-
In an inventory business, what are the difference inventory cost methods? And how does it affect the inventory?
-
I. What is profit maximization and state what limits the profit maximization as the financial goal 5 Marks ii. What is meant by risk return trade-off? and explain what is meant by risk-free rate and...
-
Bluegill Company sells 9,600 units at $160 per unit. Fixed costs are $76,800, and operating income is $691,200. Determine the (a) variable cost per unit, (b) unit contribution margin, and (c)...
-
1. Parity Check Even: Character Message A Z M N J Transmitted Message Odd: Character Message Transmitted Message S C Y U 2. Longitudinal Redundancy Checking (LRC) Message: "PARCHU" P A R C H U BCC 3....
-
Find an equation of the given line. Slope is -2; x-intercept is -2
-
What is lumped system analysis? When is it applicable?
-
A 5-cm-diameter horizontal jet of water with a velocity of 30 m/s relative to the ground strikes a flat plate that is moving in the same direction as the jet at a velocity of 20 m/s. The water...
-
A gas turbine for an automobile is designed with a regenerator. Air enters the compressor of this engine at 100 kPa and 30C. The compressor pressure ratio is 8; the maximum cycle temperature is 800C;...
-
On the Internet find the KPMG India Fraud Survey Report, 2002. a. How many chief executive officers re- ceived the questionnaire? b. How many of the respondents do not have a written fraud policy? c....
-
Using the Internet, locate and review these sites: a. National Fraud Center b. The Fraud Detectives Consultant Network c. Milberg Weiss Bershad Hynes & Lerach d. Mark R. Simmons e. Communications...
-
Go to the Internet and peruse the AICPA's "Catch Me If You Can" online fraud game.
Study smarter with the SolutionInn App