Question

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A test on two stroke engine gave the following result at full load :
Speed 250 rpmNet brake load
70 kg. mep
5 bar, fuel
consumption = 4 kg/h, Jacket cooling water flow rate = 450 kg/h, Jacket
water temperature at inlet = 20°C, Jacket water temperature at outlet = 40°C,
Test room temperature = 20°C. Temperature of exhaust gases 400°C, Air
used per kg of fuel = 35 kg, Cylinder diameter 20 cm, Stroke = 28 cm,
Effective brake diameter = Im, Calorific value of fuel = 42 MJ/kg, Proportion
of hydrogen in fuel = 16%, Mean specific heat of dry exhaust gas = 1 kJ/kg
K, Mean specific speed of steam = 2 kJ/kg/K. Sensible heat of water at room
temperature 65 kJ/kg. Latent heat of steam = 2260 kJ/kg.
Find indicated power, brake power and draw up heat balance sheet for the test
in kJ/min and in percentage.

Answer 1

Answer:

Explanation:Transcribed image text: In a test two stroke oil engine, the following results were obtained, Speed = 350 rev/min; Net brake load 600 N; Mean effective pressure = 2.66 bar; Fuel consumption = 3.2 kg/h; Cooling water used = 495 kg/h; Temperatures of jacket water at inlet and outlet = 30 degree C and 50 degree C; Exhaust gases per kg of fuel 32 kg; Temperature of exhaust gases = 432 degree C; Specific heat of exhaust gases = 1.005 kg/kg k; Inlet air temperature = 32degree C. Draw up a heat balance for the engine if its cylinder diameter = 205 mm and stroke = 275 mm; Brake drum diameter = 1.0 m; Calorific value of fuel = 40870 kJ/kg.