Homework Answers
Ans - 3
| p1 | t1 | v1 | p2 | t2 | v2 | p3 | t3 | v3 | p4 | v4 | qin | win | wout | wnet | efficiency | mep | r |
| 95 | 293 | 0.8851 | 3822.4 | 842.01 | 0.0632 | 3822.403 | 2200 | 0.1652 | 396.42 | 0.8851 | 1364.777 | 393.9331 | 801.5146 | 407.5814 | 29.8643285 | 495.91 | 14 |
| 95 | 293 | 0.8851 | 4210 | 865.57 | 0.059 | 4210.028 | 2200 | 0.15 | 383.24 | 0.8851 | 1341.098 | 410.838 | 834.8386 | 424.0007 | 31.6159277 | 513.26 | 15 |
| 95 | 293 | 0.8851 | 4608.1 | 888.21 | 0.0553 | 4608.135 | 2200 | 0.137 | 371.31 | 0.8851 | 1318.349 | 427.0794 | 865.0077 | 437.9284 | 33.217939 | 527.76 | 16 |
| 95 | 293 | 0.8851 | 5016.3 | 910.01 | 0.0521 | 5016.325 | 2200 | 0.1259 | 360.44 | 0.8851 | 1296.438 | 442.7225 | 892.4913 | 449.7688 | 34.6926638 | 539.92 | 17 |
| 95 | 293 | 0.8851 | 5434.2 | 931.06 | 0.0492 | 5434.238 | 2200 | 0.1162 | 350.49 | 0.8851 | 1275.287 | 457.8227 | 917.6663 | 459.8436 | 36.0580478 | 550.1 | 18 |
| 95 | 293 | 0.8851 | 5861.5 | 951.41 | 0.0466 | 5861.547 | 2200 | 0.1077 | 341.32 | 0.8851 | 1254.83 | 472.4275 | 940.8395 | 468.412 | 37.3287217 | 558.62 | 19 |
| 95 | 293 | 0.8851 | 6297.9 | 971.14 | 0.0443 | 6297.949 | 2200 | 0.1003 | 332.85 | 0.8851 | 1235.009 | 486.5781 | 962.2636 | 475.6855 | 38.5167522 | 565.72 | 20 |
| 95 | 293 | 0.8851 | 6743.2 | 990.27 | 0.0421 | 6743.171 | 2200 | 0.0936 | 324.99 | 0.8851 | 1215.775 | 500.3103 | 982.1485 | 481.8382 | 39.6321962 | 571.61 | 21 |
| 95 | 293 | 0.8851 | 7197 | 1008.9 | 0.0402 | 7196.957 | 2200 | 0.0877 | 317.67 | 0.8851 | 1197.082 | 513.6554 | 1000.671 | 487.0151 | 40.6835139 | 576.44 | 22 |
| 95 | 293 | 0.8851 | 7659.1 | 1027 | 0.0385 | 7659.072 | 2200 | 0.0824 | 310.82 | 0.8851 | 1178.893 | 526.6414 | 1017.979 | 491.3376 | 41.6778831 | 580.35 | 23 |
| 95 | 293 | 0.8851 | 8129.3 | 1044.6 | 0.0369 | 8129.296 | 2200 | 0.0777 | 304.41 | 0.8851 | 1161.172 | 539.2929 | 1034.201 | 494.9082 | 42.6214415 | 583.47 | 24 |
Ans - 4
T - S and P - v diagram for r=20
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Problem 1 A diesel engine has a compression ratio r = 20 and uses air as...
4. An Ideal diesel engine has a compression ratio of 20 and uses air as the...
4. 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 95kPa and 20°C. If the maximum temperature in the cycle is not to exceed 2200K, determine a) the thermal efficiency and b) the mean effective pressure. Assume constant specific heats for air at room temperature. 5. An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio...
At the beginning of the compression process of an air standard Diesel cycle, the pressure is 109 ...
At the beginning of the compression process of an air standard
Diesel cycle, the pressure is 109 kPa and the temperature is 284 K.
The volume of state 1 is 800.0 cm3. The compression ratio for the
Diesel cycle is 12 and cut-off-ratio is 1.95. Determine: a) the
heat addition, in kJ kJ b) the net work, in kJ kJ c) the thermal
efficiency % d) the mean effective pressure, in kPa kPa
At the beginning of the compression process...
A cold standard air Diesel cycle has a compression ratio of 18. The heat transferred to...
A cold standard air Diesel cycle has a compression ratio of 18. The heat transferred to the working fluid per cycle is 2000 kJ / kg. At the beginning of the compression process cycle, the pressure is 100 kPa and the temperature is 25 ° C. Determine (a) The pressure in each state of the cycle, (b) The cut-off ratio, (c) The thermal efficiency, (d) The net work per unit of mass and (e) the effective mean pressure.
An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2....
An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the com pression process, air is at 95 kPa and 27℃ Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat-addition process, (b) the thermal efficiency, and (c) the mean effective pressure
Diesel Cycle a. The pressure and temperature at each state in this cycle. b. The compression ratio. c. The cutoff ratio. d. The thermal efficiency. e. The MEP (mean effective pressure.) Consider an a...
Diesel Cycle
a. The pressure and temperature at each state in this cycle.
b. The compression ratio.
c. The cutoff ratio.
d. The thermal efficiency.
e. The MEP (mean effective pressure.)
Consider an air-standard Diesel cycle (this means use variable specific heats). The inlet state to the compression process is at 95 kPa and 300 K. At the end of the heat addition process, the temperature is 2150 K and the pressure is 7200 kPa. Accounting for the variation of...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.35. The compression ratio is 10 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle. (b) the...
Q1. At the beginning of the compression process of an air-standard Diesel cycle operating with a...
Q1. At the beginning of the compression process of an air-standard Diesel cycle operating with a compression ratio of 18, the temperature is 300 K and the pressure is 0.1 MPa. The cutoff ratio (pre-expansion ratio) for the cycle is 2. Determine: (a) the temperature and pressure at the end of each process of the cycle, (b) the thermal efficiency, (c) the mean effective pressure, in MPa.
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio...
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio of 20 and a cut-off ratio of 1.8. Air is at 30°C and 100 kPa at the beginning of the compression process. It may be assumed that for the air, the specific heat, Cp and gas constant, R are 1.005 and 0.287 kJ/kg.K, respectively. Calculate: the temperature (K) of the air at the end of the following processes: (i) (a) compression (ii) combustion, (ii...
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff rati...
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27℃. Assume constant specific heats. The properties of air at room temperature are Cp-1.005 kJ/kg-K, cv-0718 kJ/kg.K, R= 0.287 kJ/kg-K, and k = 1.4 Determine the mean effective pressure The mean effective pressure is「 kPa.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes...
Consider a modification of the air-standard Otto cycle in which the isentropic compression and expansion processes are each replaced with polytropic processes having n = 1.25. The compression ratio is 8 for the modified cycle. At the beginning of compression, p1 = 1 bar and T1 = 310 K. The maximum temperature during the cycle is 2200 K. Determine: (a) the heat transfer and work in kJ per kg of air for each process in the modified cycle. (b) the...
4. 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 95kPa and 20°C. If the maximum temperature in the cycle is not to exceed 2200K, determine a) the thermal efficiency and b) the mean effective pressure. Assume constant specific heats for air at room temperature. 5. An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio...
At the beginning of the compression process of an air standard
Diesel cycle, the pressure is 109 kPa and the temperature is 284 K.
The volume of state 1 is 800.0 cm3. The compression ratio for the
Diesel cycle is 12 and cut-off-ratio is 1.95. Determine: a) the
heat addition, in kJ kJ b) the net work, in kJ kJ c) the thermal
efficiency % d) the mean effective pressure, in kPa kPa
At the beginning of the compression process...
An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the com pression process, air is at 95 kPa and 27℃ Accounting for the variation of specific heats with temperature, determine (a) the temperature after the heat-addition process, (b) the thermal efficiency, and (c) the mean effective pressure
Diesel Cycle
a. The pressure and temperature at each state in this cycle.
b. The compression ratio.
c. The cutoff ratio.
d. The thermal efficiency.
e. The MEP (mean effective pressure.)
Consider an air-standard Diesel cycle (this means use variable specific heats). The inlet state to the compression process is at 95 kPa and 300 K. At the end of the heat addition process, the temperature is 2150 K and the pressure is 7200 kPa. Accounting for the variation of...
Q1. At the beginning of the compression process of an air-standard Diesel cycle operating with a compression ratio of 18, the temperature is 300 K and the pressure is 0.1 MPa. The cutoff ratio (pre-expansion ratio) for the cycle is 2. Determine: (a) the temperature and pressure at the end of each process of the cycle, (b) the thermal efficiency, (c) the mean effective pressure, in MPa.
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio of 20 and a cut-off ratio of 1.8. Air is at 30°C and 100 kPa at the beginning of the compression process. It may be assumed that for the air, the specific heat, Cp and gas constant, R are 1.005 and 0.287 kJ/kg.K, respectively. Calculate: the temperature (K) of the air at the end of the following processes: (i) (a) compression (ii) combustion, (ii...
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27℃. Assume constant specific heats. The properties of air at room temperature are Cp-1.005 kJ/kg-K, cv-0718 kJ/kg.K, R= 0.287 kJ/kg-K, and k = 1.4 Determine the mean effective pressure The mean effective pressure is「 kPa.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a...
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