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The gas constant for air is 0.287 kJkg K and the specific heat at constant volume...
Analyze a Diesel cycle using a constant specific heat air standard model (cP = 1.004 kJ/kg-K,...
Analyze a Diesel cycle using a constant specific heat air standard model (cP = 1.004 kJ/kg-K, R = 0.287 kJ/kg-K) with the following properties: The temperature and pressure at the beginning of the compression stroke are 300 K and 100 kPa, the compression ratio is 22, and the specific heat addition is 800 kJ/kg. Find the thermal efficiency, cut off ratio, maximum temperature in the cycle, and maximum pressure in the cycle.
Problem 1 [15 pts] Air (R=0.287 kJ/kgK), initially at 300 K and 100 kPa is heated...
Problem 1 [15 pts] Air (R=0.287 kJ/kgK), initially at 300 K and 100 kPa is heated to 450 K in an internally reversible closed system process. You do NOT need to show a system sketch for this problem. Using variable (temperature dependent) specific heats a. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant pressure b. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant volume c. Show...
A piston-cylinder assembly contains air modeled as an ideal gas with a constant specific heat ratio,...
A piston-cylinder assembly contains air modeled as an ideal gas with a constant specific heat ratio, k = 1.4. The air undergoes a power cycle consisting of four processes in series: Process 1-2: Constant-temperature expansion at 600 K from p1 = 0.5 MPa to p2 = 0.4 MPa. Process 2-3: Polutropic expansion with n = k to p3 = 0.3 MPa. Process 3-4: Constant-pressure compression to V4 = V1. Process 4-1: Constant volume heating. Sketch the cycle on a p-v...
A) Compute the specific heat capacity at constant volume of nitrogen (N2) gas. The molar mass...
A) Compute the specific heat capacity at constant volume of nitrogen (N2) gas. The molar mass of N2 is 28.0 g/mol. the answer is: 741 J/(kg*k) B) You warm 1.55kg of water at a constant volume from 23.0?C to 29.0?C in a kettle. For the same amount of heat, how many kilograms of 23.0?C air would you be able to warm to 29.0?C? Make the simplifying assumption that air is 100% N2. C) What volume would this air occupy at...
Required information An ideal Otto cycle has a compression ratio of 8. At the beginning of...
Required information An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27 and 720 kJ/kg of heat is transferred to air during the constant volume heat addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R=0.287 kJ/kg.K. Determine the network output (You must provide an answer before moving on to the next part.) The net work output...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an idea...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an ideal compression ignition engine. The compression ratio is 12. The maximum temperature in the cycle is 2040 °F. The minimum temperature and pressure in the cycle is 40 OF and 20 psia, respectively. The coefficient β=1.2 (β is the ratio of the volume after to the volume before the constant pressure heat input process). Calculate the heat added during combustion per lbm of air, and the...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
Also find thermal efficiency and the mean effective pressure please! Required information An air standard Diesel...
Also find thermal efficiency and the mean effective
pressure please!
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 91 kPa and 27C. Account for the variation of specific heats with temperature. The gas constant of air is R-0.287 kJ/kg K. Determine the temperature after the heat addition process. (You must provide an answer before moving on to the next...
4. An ideal gas with constant specific heats undergoes a process from an initial pressure of...
4. An ideal gas with constant specific heats undergoes a process from an initial pressure of 50 kPa and initial specific volume of 4 m^3/kg to a final pressure of 80 kPa and final specific volume of 5 m^3/kg. The mass of the carbon monoxide is 3 kg. The gas has a molar mass of 44 kg/kmol and a specific heat at constant volume of 0.98 kJ/(kg∙K). Determine the entropy change of the gas during the process in kJ/K.
Use variable specific heats. An air-standard dual cycle has a compression ratio of 14 and cut-off...
Use variable specific heats. An air-standard dual cycle has a compression ratio of 14 and cut-off ratio of 1.2. The pressure ratio during constant volume heat addition (process 2-X) is 1.5. Determine the: (A) Thermal efficiency (B) Amount of heat added (C) Maximum gas pressure and temperature when the cycle is operated at 80kPA and 20°C at the beginning of the compression. Use variable specific heats.
Problem 1 [15 pts] Air (R=0.287 kJ/kgK), initially at 300 K and 100 kPa is heated to 450 K in an internally reversible closed system process. You do NOT need to show a system sketch for this problem. Using variable (temperature dependent) specific heats a. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant pressure b. Find the specific entropy change (As= S2-S1) of air if the process occurs at constant volume c. Show...
Required information An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27 and 720 kJ/kg of heat is transferred to air during the constant volume heat addition process. Take into account the variation of specific heats with temperature. The gas constant of air is R=0.287 kJ/kg.K. Determine the network output (You must provide an answer before moving on to the next part.) The net work output...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an ideal compression ignition engine. The compression ratio is 12. The maximum temperature in the cycle is 2040 °F. The minimum temperature and pressure in the cycle is 40 OF and 20 psia, respectively. The coefficient β=1.2 (β is the ratio of the volume after to the volume before the constant pressure heat input process). Calculate the heat added during combustion per lbm of air, and the...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
Also find thermal efficiency and the mean effective
pressure please!
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 91 kPa and 27C. Account for the variation of specific heats with temperature. The gas constant of air is R-0.287 kJ/kg K. Determine the temperature after the heat addition process. (You must provide an answer before moving on to the next...
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