Chapter 21, Problem 45P

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Q100 The following data refers to a test on a single-cylinder four-stroke oil engine Cylinder bore 220 mm; stroke 360 mm; area of indicator diagram 360mm ²; length of diagram 40mm; indicator spring rating = 1.25 mm/bar; Speed 300 rev/min brake load 441.3 N at 0.9m radius; fuel consumption 3.8 Kg/hr; Calorific value of fuel 43124 kj/kg; Cooling water flow 3.8kg/hr; rise in temperature of cooling water 48K; and specific heat capacity of water 4.1868 kj lkg. k. god valamily Calculate: @the mechanical efficiency the indicated thermal efficiency lo The heat balance sheet expressed as kj/min andas percentage of the heat supplied to the engine.

Q In a test on a two.. strok, heavy oil, marine engine, the following observations were made: Oil consumption, 4.05 kg/h; Calorific value of oil, 43000kj/kg; het brake load 579N; Mean brake diameter, 1m; mean effective pressure 275 kN/m²; cylinder diameter 0.20m; stroke, 0.250m; speed, 360 rpm. Calculate the mechanical efficiency the indicated thermal efficiency Y The brake thermal efficiency and the quantity of jacket water required per مسموح به امتصت minute if 30% of the energy supplied by the fuel is absorbed by this water. Permissible rise in temperature is 20k and specific heat capacity of water-4.1868 kj Answers [84.2%, 26-8%, 22.6%, 8.33 kg/min] kg.k عماد داود عبود

Q78 A four cylinder, four-stroke Petrol engine has a compression ratio of 6 to 1. A test on this engine gave the following results; Net brake load = 20 kg, effective brake arm = 0.5 m, indicated mep=6*105 N/m², engine speed 2400 rpm, fuel consumption = 10 kg/h, Calorific value of the fuel = 44000kj/kg, Cylinder bore 86 mm, engine stroke-100mm. ข่าวล Calculate: the mechanical efficiency, ⑥the brake thermal efficiency the relative efficiency assuming the engine works on the Constant volume cycle and that 8-1.4 forair ⑧The brake mean effective pressure. Answers 1 88.4%, 48/5-35 × 105 N/m² 1 و و

Hom Work عماد داود عبور (35) Q18 The Fiat car has a four strok engine of 1089 C.C capacity.It develops maximum power 32kw at 5000 r.p.m. The volumetric efficiency at this speed is 75% and the air-fuel ratio 13:1, At peak power the theoretical air speed at the choke is 120 m/sec. The coefficient of discharge for the venturi is 0.85 and that of the main petrol jet is 0.66. An allowance should be made for the emulsion tube, the diameter of which can be taken as (1/2.5) of the choke diameter. the Petrol surface is 6 mm blow the choke at this engine condition. Calculate the size of a suitable choke (D) and main jet (d).The specific gravity of Petrol is 0.75 andthe Latmospheric pressure 1.03 bar and temperature 27°c. [D=23.2mm,d=1.296mm]

Q8: A test carried out on a single cylinder, two. Stroke oil engine gave the following data: Cylinder bore = 200 mm, stroke 250mm, engine speed = 300 rpm, net brake torque 500N.m indicated mean effective Pressure = 4.9*105 N/m², fuel consumption = 5kg/min, Cooling water. rate of flow = 0.0666 kg/sec, temperature rise of cooling water-55k, specific heat capacity of water =4.1868 kj/kg.k. calculate the mechanical efficiency, the specific fuel consumption, and draw up an energy balance in kw. Answers [@ 81.6, 0.318 kg/kW.hr, © Qtotal = 61.1kw,- Qb.p = 15.7 Kw₂ & Cooling water = 15.35kw,Q Exhaust = 30.05 kw]

Q6: A single cylinder oil engine has a compression ratio of 1081. The specific fuel cons umption is 0.6 kg/kw.h, the calorific value of the fuel oil is 44000kj/kg.199 calculate the thermal efficiency and the relative efficiency, assuming the engine operates on the constant volume cycle. Take 8=1.4 for air Answers [13.6% 22.6%] 2199

Q7: An amount of a perfect gas has initial conditions of volume (1 m³), pressure (1 bar) and temperature (18 °C). It undergoes ideal Diesel cycle operation, the pressure after isentropic compression being (50 bar) and the volume after constant pressure expansion being (0.1 m³). Calculate the temperature at the major points of the cycle and evaluate the thermal efficiency of the cycle. Assume y=1.4 for the gas Answers T2-890 K, T3 1455 K, T4-579 K, 63.59%