Q3 An oil engine takes in air at (1.01 bar), (20 °C) and the maximum cycle pressureis (69 bar). The compression ratio is (18:1). Calculate the air standard efficiency andmean effective pressure based on the Dual combustion cycle. Assume that heatadded at constant volume is equal to the heat added at constant pressure. Take[Cp 1.005 Kj/Kg.K, C= 0.718 Kj/Kg.K and y =1.4]. Answers: [(68.24 %), (2.2579 bar)]

Given Data:Initial pressure (P1) = 1.01 barInitial temperature (T1) = 20°C = 293 KMaximum cycle…

Answered: Q3 An oil engine takes in air at (1.01…

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

See similar textbooks

Similar questions

An oi! engine takes in air at 1.01 bar. 20 °C and the maximum cycle pressure is 69 bar. The compression ratio is 18/1. Calculate the air standard thermal efficiency based on the dual combustion cycle 2 And represent the cycle on p-v diagram. Assume that the heat added at constant volume is equal to the heat added at constant pressure. Take Cp = 1.005 kJ/kg•K, C. = 0.718 kJ/kg·K for air.
At the beginning of compression, Otto cycle works on 0.2 lb/s of air at 14 psia and 130F. The temperature at the completion of combustion is 4500R, the compression ratio is 5.5, and the hot-air standard is k = 1.3. a. Find V1 , P2 , T2 , P3 , V3 , T4b. Compute the heat added (QA),heat rejected (QR), work (W) andthe cycle efficiency (e).
An ideal air-standard Brayton cycle operating at steady state produces 50 MW of power. Operating data at principal states in the cycle are given in the table below. The states are numbered as in the figure below.
A diesel engine has air before compression at 280 K, 85 kPa. The highest temperature is 2200 K and the highest pressure is 6 MPa. Find the volumetric compression ratio and the mean effective pressure using cold air properties at 300 K.
(8) An SI, six-liter, V8 race car engine operates at WOT (wide open throttle) on a four- stroke cycle at 6000 r.p.m. using stoichiometric nitromethane. fuel enters the engine at a rate of 0.198 kg and combustion efficiency is 99%. calculate: (a) Volumetric efficiency of engine. (%) sec (b) flow rate of air into engine. (ke sec (c) Heat added per cycle per cylinder. (kj) ANS: (a) 95, (b) 0.337, (c)5.35
A Brayton cycle inlet is at 300 K, 100 kPa and the combustion adds 670 kJ/kg. The maximum temperature is 1200 K due to material considerations. What is the maximum allowed compression ratio? For this calculate the network and cycle efficiency. (7.5 , 293.5 kJ/kg , 0.438)
The compression ratio in an air standard Otto cycle is 9. At the beginning of the compression stroke, the pressure is 0.1 MPa and the temperature is 21 C. The heat transfer to the air per cycle is 2000 kJ/kg. Use the PG model for air. I am trying to find the Mean Effective Pressure from this information
b) Calculate the maximum compression ratio of an Otto cycle internal combustion engine operating on natural gas, Methane (CH4) which has an auto-ignition temperature 540°C in air given an ambient intake temperature of 30°C.
The stroke and cylinder diameter of a compression ignition engine are 250 mmand 150 mm respectively. If the clearance volume is 0.0004 ?^3 and fuelinjection takes place at constant pressure for 5 per cent of the stroke determinethe efficiency of the engine. Assume the engine working on the diesel cycle.
Cylinder conditions at the start of compression in an SI engine operating at WOT on an air-standard Otto cycle are 60C and 98 kPa. The engine has a compression ratio of 9.5:1 and uses gasoline with AF 15.5. Combustion efficiency is 96%, and it can be assumed that there is no exhaust residual. Calculate: (a) Temperature at all states in the cycle. [0C] (b) Pressure at all states in the cycle. [kpa] (c) Specific work done during power stroke. [kJ/kg] (d) Heat added during combustion. [kJ/kg] (e) Net specific work done. [kJ/kg] (f) Indicated thermal efficiency. [%] 2
4. An ideal dual combustion cycle has a compression ratio of 10. At the beginning of compression, the pressure and temperature of air is 13 psia and 64 °F with a specific volume of 11.22 ft^3/lbm. Calculate the following if the heat added at constant volume and pressure is 150 BTU/lbm. a. The cycle temperature at the beginning of the heat rejection process in °R b. The cycle heat rejected, BTU/lb c. The cycle network, BTU/lb.
Having determined the efficiency of different above engines, you should review these efficiencies by comparing them with each other and comparing values with published efficacy data for these types of engines. I found the efficiency. I just need a clear explanation of the above theory part. φ = 0.2

SEE MORE QUESTIONS

Recommended textbooks for you

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Elements Of Electromagnetics

Mechanical Engineering

ISBN:

9780190698614

Author:

Sadiku, Matthew N. O.

Publisher:

Oxford University Press

Mechanics of Materials (10th Edition)

Mechanical Engineering

ISBN:

9780134319650

Author:

Russell C. Hibbeler

Publisher:

PEARSON

Thermodynamics: An Engineering Approach

Mechanical Engineering

ISBN:

9781259822674

Author:

Yunus A. Cengel Dr., Michael A. Boles

Publisher:

McGraw-Hill Education

Control Systems Engineering

Mechanical Engineering

ISBN:

9781118170519

Author:

Norman S. Nise

Publisher:

WILEY

Mechanics of Materials (MindTap Course List)

Mechanical Engineering

ISBN:

9781337093347

Author:

Barry J. Goodno, James M. Gere

Publisher:

Cengage Learning

Engineering Mechanics: Statics

Mechanical Engineering

ISBN:

9781118807330

Author:

James L. Meriam, L. G. Kraige, J. N. Bolton

Publisher:

WILEY

SEE MORE TEXTBOOKS