Assume: k = Cp/Cv = 1.3; R = 0.287 kJ/kg-K, Cp = (kR)/(k-1); = R/(k-1); Cp-Cv=R...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Assume: k = Cp/Cv = 1.3; R = 0.287 kJ/kg-K, Cp = (k"R)/(k-1); = R/(k-1); Cp-Cv=R Problem 1: The thermal efficiency of an air-standard Otto cycle is 50%. The maximum pressure in the cycle is 120 times the pressure at the start of the compression process. If the pressure and temperature at the start of compression are 100 kPa and 300 K, respectively, determine the following. a) Derive an expression for the thermal efficiency of the Otto cycle as a function of only the compression ratio (Rc) and the ratio of specific heats (k). Once you have done this, determine the compression ratio for the Otto cycle described above. Determine the pressure (kPa) and temperature (K) at each state b) c) Determine the magnitude of net cycle work (kJ/kg) d) Determine the magnitude of net heat input (kJ/kg) e) Determine the mean effective pressure (kPa) Problem 2: The volume at the start of compression for an Otto cycle is 2000 cc. The pressure and temperature at the start of compression are 100 kPa and 300 K. At the end of the compression process the volume is compressed to 10% of the volume at the start of compression. The maximum allowable temperature is 2200 K. Determine the pressure and temperature at each state, the net work in the cycle (kJ), the heat input (kJ), the heat rejected (kJ), and the mean effective pressure (kPa) Problem 3: The pressure and temperature at the start of compression of an air-standard Diesel cycle are 95 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 Mpa and the temperature is 2150 K. Determine the compression ratio, the cut-off ratio, the thermal efficiency of the cycle, and the mean effective pressure in KPa Problem 4: An innovative cycle to improve the overall thermal efficiency of an engine consists four distinct processes, viz. process 1-2 isentropic compression, process 2-3 constant volume heat addition, process 3-4 isentropic expansion and finally, process 4-1 constant pressure heat rejection. The compression ratio is 8.5 and the pressure and temperature at the beginning of compression are P1 = 100 kPa and T1 = 300 K. If the heat input is 1400 kJ/kg, determine the following: 1. Sketch the P-v and T-s diagrams for this cycle 2. The net work for the cycle in kJ/kg 3. Thermal efficiency of the cycle 4. Mean effective pressure in kPa Assume: k = Cp/Cv = 1.3; R = 0.287 kJ/kg-K, Cp = (k"R)/(k-1); = R/(k-1); Cp-Cv=R Problem 1: The thermal efficiency of an air-standard Otto cycle is 50%. The maximum pressure in the cycle is 120 times the pressure at the start of the compression process. If the pressure and temperature at the start of compression are 100 kPa and 300 K, respectively, determine the following. a) Derive an expression for the thermal efficiency of the Otto cycle as a function of only the compression ratio (Rc) and the ratio of specific heats (k). Once you have done this, determine the compression ratio for the Otto cycle described above. Determine the pressure (kPa) and temperature (K) at each state b) c) Determine the magnitude of net cycle work (kJ/kg) d) Determine the magnitude of net heat input (kJ/kg) e) Determine the mean effective pressure (kPa) Problem 2: The volume at the start of compression for an Otto cycle is 2000 cc. The pressure and temperature at the start of compression are 100 kPa and 300 K. At the end of the compression process the volume is compressed to 10% of the volume at the start of compression. The maximum allowable temperature is 2200 K. Determine the pressure and temperature at each state, the net work in the cycle (kJ), the heat input (kJ), the heat rejected (kJ), and the mean effective pressure (kPa) Problem 3: The pressure and temperature at the start of compression of an air-standard Diesel cycle are 95 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 Mpa and the temperature is 2150 K. Determine the compression ratio, the cut-off ratio, the thermal efficiency of the cycle, and the mean effective pressure in KPa Problem 4: An innovative cycle to improve the overall thermal efficiency of an engine consists four distinct processes, viz. process 1-2 isentropic compression, process 2-3 constant volume heat addition, process 3-4 isentropic expansion and finally, process 4-1 constant pressure heat rejection. The compression ratio is 8.5 and the pressure and temperature at the beginning of compression are P1 = 100 kPa and T1 = 300 K. If the heat input is 1400 kJ/kg, determine the following: 1. Sketch the P-v and T-s diagrams for this cycle 2. The net work for the cycle in kJ/kg 3. Thermal efficiency of the cycle 4. Mean effective pressure in kPa
Expert Answer:
Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
Posted Date:
Students also viewed these mechanical engineering questions
-
Which of the compounds in Problem 2 are antiaromatic? Problem 2 a. b. c. Cycloheptatrienyl cation d. e. f. g. Cyclononatetraenyl anion h. CH2=CHCH=CHCH=CH2
-
Problem 2 identified two capacity options for Arktec Manufacturing, and problem 4 identied three possible demand outcomes. a. Draw the decision tree for Arktec Manufacturing. When drawing your tree,...
-
Problem 2 involves a different scenario, where the caf owner has decided to offer catering packages to local groups. Three catering package types, breakfast, lunch, and coffee break, each consisting...
-
A company had average total assets of $500,000, gross sales of $575,000, and net sales of $550,000. The companys total asset turnover is a. 1.15. b. 1.10. c. 0.91. d. 0.87. e. 1.05.
-
Describe how a lockbox arrangement with a bank works. What is its advantage to an organization? What risks are associated with it? What controls should an entity develop to mitigate each of the risks...
-
Based on Figure 5P-2, producer surplus is $0 when price is less than or equal to what price? Figure 5P-2: Price ($) 15 14 13 12 11 10 De 10 20 60 70 80 100 30 40 50 90 Quantity
-
Sheri Neylon has trouble keeping her debits and credits equal. During a recent month, Sheri made the following errors: a. Sheri recorded a $850 payment of rent by debiting Rent Expense for $85 and...
-
1. Why are consumer research and design thinking so critical to Intuit's success? 2. What are the challenges Intuit faces in the near future? 3. How important are Intuit's products for mobile devices?
-
A bicycle manufacturer is in talks to invest in some new equipment for their production department, and they are exploring different options. The first option is equipment that will cost $13000, and...
-
Mark Make-a-Buck sells jars of beach sand in Florida. His price per jar is $2.50. His historical costs have been: $.40 per item $.10 per item $.30 per item $.20 per item $500 per month $1,000 per...
-
Justin wants to compare the amount he would need to repay; using Simple Interest Future Value & Compound Interest Future Value (annually) if he is going to borrow $15, 000 from a bank at 7.75%...
-
Let f:x->Y and g:Y->Z be two functions (mapping ) (i) If f and g are both injective, then show that the composition of gof is also injective.
-
the sum of ages of a father and his son is 43 while the difference in their age is 25.what is the age of the father
-
How do emerging techniques such as single-cell sequencing and spatial transcriptomics revolutionize our understanding of cellular heterogeneity and tissue organization in complex organisms? Explain
-
What should the flow meter read in gallons per minute if a 6.0 inch diameter chemical feed pipe at a water plant is to be flushed at a velocity of 4.6 feet per second
-
the lengthof a rectangle is eight more than twinc its width. the perimeter is 88 feet find the dimension of the rectangle
-
The Bike Store is writing a new system to manage inventory. You need to write a class that sets up bikes received. The fields to store are brand, model, size, type, and price. There are three...
-
Distinguish between the work performed by public accountants and the work performed by accountants in commerce and industry and in not-for-profit organisations.
-
Determine the exergy destruction associated with each of the processes of the Rankine cycle described inProb. 10-12, assuming a source temperature of 1500 K and a sink temperature of 290 K.
-
Steam enters an adiabatic nozzle at 2 MPa and 350C with a velocity of 55 m/s and exits at 0.8 MPa and 390 m/s. If the nozzle has an inlet area of 7.5 cm2, determine (a) The exit temperature and (b)...
-
Consider subsonic Rayleigh flow of air with a Mach number of 0.92. Heat is now transferred to the fluid and the Mach number increases to 0.95. Does the temperature T of the fluid increase, decrease,...
-
Why are auditors concerned with related parties during the planning process?
-
The auditor will not ordinarily initiate discussion with the audit committee concerning the a. Extent to which the work of internal auditors will influence the scope of the audit. b. Extent to which...
-
Which of the following should an auditor obtain from the predecessor auditor prior to accepting an audit engagement? a. Analysis of balance sheet accounts. b. Analysis of income statement accounts....
Study smarter with the SolutionInn App