Energy Auditing and Volumetric Efficiency of A C.I Engine
Energy Auditing and Volumetric Efficiency of A C.I Engine
Energy Auditing and Volumetric Efficiency of A C.I Engine
Experiment No 05
NAME OF THE EXPERIMENT: Energy Auditing and volumetric efficiency of a C.I
Engine
ENGINE: Mahindra make, model DI475, type 4-cylinder, 4- stroke diesel engine, water-
cooled, power 31kw at 2300 rpm. Stroke length- 96 mm, cylinder bore- 88.9mm, 2386 cc,
compression ratio- 18:1
Indicator for p-v diagram. provision is also made for interfacing airflow , fuel flow ,
temperatures and load measurements. The setup has stand alone panel box consisting of
air box , fuel tank manometer, fuel measuring unit, transmitter for air and fuel flow
measurements, engine interface and engine indicator. Rotameter are provided for cooling
water and calorimeter water flow measurement. The setup enables study of engine
performance for brake power, indicated power, frictional power, power, BMEP, IMEP, brake
thermal efficiency, indicated thermal efficiency, mechanical efficiency, volumetric
efficiency, specific fuel consumption, A/F ratio and heat balance. Windows based engine
performance analysis software package "Engine Soft" is provided for on line performance
evaluation.
INTRODUCTION: Out of the supplied only a portion is converted into useful work.
The purpose of a heat balance is to find out how the total heat of the fuel consumed
in a particular time say 1 minute is apportioned and how much unaccounted loss is
there.
1
Internal Combustion Laboratory
Department of Mechanical Engineering
Birla Institute of Technology, Mesra, Ranchi
The heat loss in F.H.P. Can be calculated by converting it to the heat unit.
Exhaust gas value has been mentioned in the engine software table.
The cooling water inlet and outlet pipes are provided with thermocouples and the
respective temperature are registered on the test bench. These readings are taken after a
steady state has been reached. The rate of flow of water can be observed on water
meter of the test bench or by actual measurement.
Heat carried away by cooling water/min= (weight of cooling water per minute
*difference of outlet and inlet temperature)
2
Internal Combustion Laboratory
Department of Mechanical Engineering
Birla Institute of Technology, Mesra, Ranchi
3. Mechanical efficiency
brake power
ƞmech=
indicated power
4. Volumetric efficiency
BSFC and ISFC are the fuel consumption based on brake power and indicated power
respectively.
F volume of fuel
=
A volume of air
It is the energy released per unit quantity of the fuel, when the combustible is burned.
NT
power = (KW)
60000
Where, T=torque in Nm
N= speed in rpm
p ℑ∗L∗A∗n∗K
ip =
60∗1000
Where,
3
Internal Combustion Laboratory
Department of Mechanical Engineering
Birla Institute of Technology, Mesra, Ranchi
K=no. of cylinders
OBSERVATION TABLE
Speed Load T1c T2c T3c T4c T5c T6c Fuel Air F1 F2 F3 F4
(RPM) (kg) Cc/ mmwc Kg/h Kg/h lph lph
m