16.34 In a test of an oil engine under full load condition the following resultswere obtained.ipbrake powerFuel usedRate of flow of water through gas calorimeterCooling water flow rateCalorific value of fuel33 kW27 kW8 kg/h12 kg/min7 kg/min43 MJ/kg15 °C%3DInlet temperature of cooling waterOutlet temperature of cooling waterInlet temperature of water to exhaustgas calorimeter%3D75°C15 °C%3DOutlet temperature of water to exhaustgas calorimeterFinal temperature of the exhaust gasesRoom temperature55 °C80 °C17 °CAir-fuel ratio on mass basis = 20%3D= 1 kJ/kg KSpecific heat of water = 4.18 J/kg KMean specific heat of exhaust gasDraw up a heat balance sheet and estimate the thermal and mechanicalefficiencies.

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Answered: 16.34 In a test of an oil engine under…

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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1000 cfm of air at 95°F dry bulb, 74°F wet bulb is mixed with 2000 cfm of air at 65°F dry bulb, 54°F wet bulb. Determine the volumetric flow rate of the mixed stream.A. 1845 cfmB. 2445 cfmC. 2745 cfmD. 3104 cfm
CO2 enters a compressor at 1 bar, 34 ° C, with a velocity of 28.4 m / s through a 150 mm diameter pipe located 7 m below the discharge line and exits at 8 bar and 265 ° C through a 120 mm diameter pipe. The heat losses are 4.5 kJ / kg. It is asked to calculate:Data: CP = 0.85 kJ / kg. °C Molar mass = 44 Local electricity tariff = S /. 0.2780 / kWh a) The velocity of the gas at the outlet, in m / sb) The mechanical power (shaft), if the compression efficiency is 78%, in kWc) If the compressor must deliver 15,000 m3 of compressed air per day, continuously, what consumption (kWh) and what monthly cost (S /.) Does this compressor originate, if the efficiency of its motor is 80%?
Assuming the clearance is negligible for a single stage compressor with the following data : Atmospheric pressure = 90 kPa, Atmospheric temperature = 17 degrees, Delivery pressure = 7 bar, Free air delivery flow rate = 0,2 m³/min. Take n= 1,3, Cp=1,005 KJ/Kg K, Cv=0,718 KJ/Kg K Determine the following : A) Which formula is used to evaluate the delivery temperature for an isentropic? B) the delivery temperature of air for a polytropic compression process with n=1,25 in Kelvin to 1 decimal place? C) the mass flow rate of air inside the compressor operating isentropically in kg/min to 3 decimal places? D) the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1,25? E) the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal? F) the power input to the compressor if the compression is isentropic in kW to 3 decimal places? G) the delivery temperature of air for an isentropic…
Use the following conversions where necessary:1hp = 745.7W; ρwater = 1000 kg/m3; ρmercury = 13600 kg/m3; 1 atm = 101.325 kPa; Cp (water) = 4.18 kJ/kg °C; g = 9.81m/s2; For properties of air, use R = 0.287 kJ/kg K; Cv (air) = 0.718 kJ/kg K; Cp (air) =1.005 kJ/kg K air enters a pipe at 25 °C, 100 kPa with a volumetric flow rate of 23 m3/h. On the outer pipe surface is an electrical resistor covered with insulation. With a voltage of 120 V, the resistor draws a current of 4 amps. Assuming the ideal gas model with cp = 1.005 kJ/kg - K for air and ignoring kinetic and potential energy effects, determine i. the mass flow rate of the air, in kg/h ii. the temperature of the air at the exit, in °C
Air passes through a narrow section during horizontal flow. The initial air temperature is 21 [℃], flow rate 91.5 [m / s], pressure 10.56 [Kg / cm2 abs], later flow rate 152 [m/s], pressure 7.05 [Kg/cm2. abs], what is the temperature of the air at the outlet if there is no outside or heat coming in? The average specific heat of air is 7 [kcal / kg mol. ℃] and calculate as an ideal gas.
32 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at 115ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2014.7 kJ/kg B) 649.1 kJ/kg NS) 2118.6 kJ/kg D) 2066.7 kJ/kg TO) 597.1 kJ/kg
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Water flows through a horizontal coil heated by steam condensing on the outside. If the inlet pressure and temperature are 2 atm and 160°F (state 1) and at the exit 1 atm and 220°F (state 2), calculate the heat added to the coil per pound mass of water. The entering velocity in 5 ft/s, and the leaving, 500 ft/s. Data: H1=127.9 BTU/lb, H2=1154.4 BTU/lbA. 1031 BTU/lbB. 1042 BTU/lbC. 1048 BTU/lbD. 1052 BTU/lb
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The following are reasons why we use assumptions to represent reciprocating engines as closed system cycles, EXCEPT: a.All statementds are valid b.Reciprocating engines have equivalent thermal efficiencies as their corresponding cycles c.The shape and behavior of reciprocating engines are too complex d.The working fluid for reciprocating engines is an air-fuel mixture, which could be difficult to model
For a period of 0.2 hour of test, 620 grams of fuel with density of 875.4 Kg/m^3 at 37.5 degree-C are completely burned with air at air-fuel ratio of 14 Kg of air per one Kg of diesel fuel. The compression ratio is 14. Using a brake torque analysis, the dynamometer reads a scale of 85 Kg with 35 cm arm at 440 rpm. (i) Find the brake thermal efficiency of a supercharged 4-cylinder, 4 stroke cycle Diesel engine with a bore and stroke of 10cmx16cm. Note: recquires unit analysis

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