Calculate the indicated thermal efficiency

Reference no: EM13800807

1. A 3-cylinder, 4-stroke engine has a bore of 76 mm and a stroke of 125 mm. It develops 12 kW at the shaft when running at 1500 rpm. If the mechanical efficiency is 85% and it bums 3.2 kg of oil per hour of calorific value 42000 kJ/kg, find the indicted mean effective pressure, assuming all cylinders produce the same power, and the brake thermal efficiency.

2. A 4-cylinder, 4-stroke engine of 78 mm bore and 105 mm stroke develops an indicated power of 47.5 kW at 4400 rpm. The air/fuel ratio is 21 kg air/kg fuel, the fuel consumption is 13.6 kg/h and the calorific value of the fuel is 41.8 MJ/kg. Calculate for the engine:

(a) the indicated mean effective pressure;

(b) the indicated thermal efficiency;

R = 287 J/kgK

3. A 6-cylinder, 4-stoke diesel engine has a bore of 210 mm and a stoke of 315 mm. At 750 rpm, the brake mean effective pressure is 4.89 bar and the specific brake fuel consumption is 0.195 kg/kWh. The air to fuel mass flow ratio is 28 to 1 and the atmospheric conditions are 0.95 bar, 17° C. Calculate the volumetric efficiency.

Reference no: EM13800807

Questions Cloud

Difference between executive pay and non-executive pay : Contrast the principle difference between executive pay and non-executive pay, including a discussion on controversies associated with the growing disparity between executive and non-executive compensation packages.

Discuss compensation and benefit issues : Contingent workers are assuming a greater role in today's organization. With that as a background, discuss compensation and benefit issues associated with the following workers: part-time, temporary, independent workers, and flexible/telecommutin..

Citizens and create transparency in the democratic process : ICTs have become widespread. As such, governments have started adopting ICTs to meet the needs of their citizens and create transparency in the democratic process. The participation of stakeholders is often used by designers to help ensure that the t..

Determining appropriate international pay strategy : Include within your discussion the strengths and weaknesses of each method and factors that should be considered when determining the appropriate international pay strategy. How should organizations balance host-country income tax differentials? ..

Calculate the indicated thermal efficiency : A 4-cylinder, 4-stroke engine of 78 mm bore and 105 mm stroke develops an indicated power of 47.5 kW at 4400 rpm. The air/fuel ratio is 21 kg air/kg fuel, the fuel consumption is 13.6 kg/h and the calorific value of the fuel is 41.8 MJ/kg. calcula..

Alternative hypotheses using statistical notation : What is the value of p-hat = percentage of ‘Yes' votes of the sample? How does it compare to 0.5 (the general belief)?

Discuss the leaders that could be in a social instituion : Discuss the six types of leaders that could be in a social institution

Chris and pat aquino own a successful isp : Consider the following scenario: Chris and Pat Aquino own a successful ISP (Internet Service Provider) and want to expand their business to host an Internet auction site. The auction site will let sellers offer items for sale, such as antiques, first..

Medicare and medicaid reduce the supply of medical care : What is one cited reason why healthcare expenditures are so high in the United States? What is one cited reason why healthcare expenditures are so high in the United States? Medicare and Medicaid reduce the supply of medical care.

User Account

All Pages