Q2: A 1.78 L four-stroke petrol engine was tested at 2500 rpm. The developed brake power is 28 kW and the brake specific fuel consumption (bsfc) is 290 g/kW.hr. Air consumption is measured by means of air-box method with orifice diameter 3.2-cm and discharge coefficient 0.62 and the pressure difference across the orifice is 150-mm-water. The ambient pressure and the temperature in the test room is 101 kPa and 20 °C. Assume: CV = 43.9 MJ/kg, PH20 =10³ kg/m³, comb = 98%, nmech = 87%. (i) Determine the bmep, AFR, 1v, power loss as friction, th,b- (ii) draw up the heat balance sheet on percentage basis, if the cooling water flow is 15 kg/min; rise in temperature of cooling water is 33 °C; exhaust gas temperature is 485 °C; Cpw is 4.2 kJ/kg.K and Cpesh is 1.25 kJ/kg.K.

Q2: A 1.78 L four-stroke petrol engine was tested at 2500 rpm. The developed brake power is 28 kW and the brake specific fuel consumption (bsfc) is 290 g/kW.hr. Air consumption is measured by means of air-box method with orifice diameter 3.2-cm and discharge coefficient 0.62 and the pressure difference across the orifice is 150-mm-water. The ambient pressure and the temperature in the test room is 101 kPa and 20 °C. Assume: CV = 43.9 MJ/kg, PH20 =10³ kg/m³, comb = 98%, nmech = 87%. (i) Determine the bmep, AFR, 1v, power loss as friction, th,b- (ii) draw up the heat balance sheet on percentage basis, if the cooling water flow is 15 kg/min; rise in temperature of cooling water is 33 °C; exhaust gas temperature is 485 °C; Cpw is 4.2 kJ/kg.K and Cpesh is 1.25 kJ/kg.K.

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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Concept explainers

Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.

Question

=
Q2: A 1.78 L four-stroke petrol engine was tested at 2500 rpm. The developed brake power is
28 kW and the brake specific fuel consumption (bsfc) is 290 g/kW.hr. Air consumption is
measured by means of air-box method with orifice diameter 3.2-cm and discharge coefficient
0.62 and the pressure difference across the orifice is 150-mm-water. The ambient pressure and
the temperature in the test room is 101 kPa and 20 °C. Assume: CV 43.9 MJ/kg,
PH20 -10³ kg/m³, comb = 98%, mech = 87%. (i) Determine the bmep, AFR, nv, power loss as
friction, th.b. (ii) draw up the heat balance sheet on percentage basis, if the cooling water flow
is 15 kg/min; rise in temperature of cooling water is 33 °C; exhaust gas temperature is 485 °C;
Cpw is 4.2 kJ/kg.K and Cpesh is 1.25 kJ/kg.K.

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