Calculate the thermal efficiency and mean effective pressure of an airstandard diesel cycle with a compression ratio of 15:1 if the swept volume is0.7589m³ and the maximum and minimum cycle temperatures are 1650°Cand 15°C respectively. The maximum cycle pressure s 4500kPa.Consider the compression and expansion processes as adiabatic.

Given: Pressure, temperature at different points and compression ratio. Required: Thermal…

Answered: Calculate the thermal efficiency and…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Solve the Problem. Submit your solution with the problem with the submission area. Consider an ideal air-standard diesel cycle in which the state before the compression process is 95 kPa, 290 K, and the compression ratio is 20. Find the maximum temperature (by iteration) in the cycle to have a thermal efficiency of 60%?
(1) A four-cylinder engine has a compression ratio of 8, and cach cylinder has a maximum volume of 0.6 L. At the beginning of the compression process, the air is at 98 kPa and 17°C, and the maximum temperature in the cycle is 1800 K., dctermine (a) the amount of heat supplied per cylinder. (b) the thermal efficiency, and (c) the number of revolutions per minute rcquired for a net power output of 60 kW. Study the effect of varying the compression ratio from 5 to 11 on the network done and the efficiency of the cycle. Plot the P-v and T-s diagrams for the cycle, and discuss the results.
Show a derivation of final temperature of otto cycle and diesel cycle in terms of initial temperature and ratios
The quantity of heat added in the air standard diesel cycle is 2,500kJ/kg of working material. Determine the theoretical work net production of the engine if the cycle's peak temperature is 1000K.
Thermodynamics
Two ideal Brayton cycles (see Figure below) have the same inlet temperature and the same maximum temperature of the turbine inlet. Brayton Cycle A has a higher compression ratio than Cycle B. Which of the following statements is true about the cycles? Cycle A has a higher thermal efficiency and Cycle B has a higher work net for a given mass flow rate. Cycle B has a higher thermal efficiency and a higher work net for a given mass flow rate. Since the temperatures are the same the efficiencies and work net are also the same. Cycle A has a higher work net for a given mass flow rate and Cycle B has a higher thermal efficiency. Cycle A has a higher thermal efficiency and a higher work net for a given mass flow rate.
2) The compression ratio of an ideal Otto cycle is 7 and prior to compression air is at 285K and 90kPa. The maximum pressure of the cycle is 4100kPa. Assuming that the specific heats are constant where k = 1.4 and cp = 1.005 kJ/kgK. Calculate a) the maximum temperature, ԴՈՒ --- ..z a uvau pian -paving- AT
3. 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 95 kPa and 27 °C. 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. T, K h, kJ/kg Pr u, kJ/kg 300 300.19 1.3860 214.07 621.2 57.60 624.95 41.85 840 866.08 860 888.27 63.09 641.40 39.12 880 910.56 68.98 657.95 36.61 900 932.93 75.29 674.58 34.31 1700 1880.1 1025 1392.7 4.761 1750 1941.6 1161 1439.8 4.328 sº, kJ/(kg-K) 1.70203 2.77170 2.79783 2.82344 2.84856 3.5979 3.6336
(b) Derive an expression for thermal efficiency of ideal Brayton cycle
A diesel engine working on the dual combustion cycle takes in air at 95kPa, 25°C and has a maximum cycle pressure of 6600kPa. The compression ratio is 15:1. Assuming that the heats supplied at constant volume and pressure are equal, calculate the thermal efficiency. Take the compression and expansion processes as adiabatic and c and Cp for air as 0.718kJ/kgK and 1.005kJ/kgK respectively.

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