2. Air flows in a steady manner through a converging tube. At the inlet there are 690kPaa and 1.193m/kg. If 125m/min of air enters at the rate of 1.57 m/sec and the exit section has a diameter of 35cm, determine (a) the mass flow rate in kg/sec, (b) the diameter of the entrance section in mm and (c) the exit velocity in m/min.
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- ( See I have Attached Solution Too ,That I have recieved Earlier but It seems to be Wrong , I think W =P(Vs+Vc) Can anybody Clarify it.) An engine cylinder is 127mm in diameter, and the piston stroke is 508mm long, the clearance volume is 0.001m3, and the pressure constant is 735kPa. What is the work done in the cylinder during a single stroke? A) 3.995 kJ B) 2.530 kJ C) 8.576 kJ D) 5.287 kJDresden, Germany has a population of 700,000 and a population density of2200 km-2 in the urban area. Assume that the electrical needs of Dresden are an average of1.0 kWe per capita and these are satisfied by a wind farm consisting of 100 m diameterthree-rotor wind turbines operating at optimal efficiency and with optimal spacing. If thewind velocity is constant at 7 m/s, what is the area of the wind farm? The optimal efficiency, η = 0.49 and The ideal spacing for a turbine is 300m by 1000 meters Sustainable energy, 2nd edition, Ch 10, Problem 17PDresden, Germany has a population of 700,000 and a population density of2200 km-2 in the urban area. Assume that the electrical needs of Dresden are an average of1.0 kWe per capita and these are satisfied by a wind farm consisting of 100 m diameterthree-rotor wind turbines operating at optimal efficiency and with optimal spacing. If thewind velocity is constant at 7 m/s, what is the area of the wind farm? The optimal efficiency, η = 0.49 and The ideal spacing for a turbine is 300m by 1000 meters Answer in km2
- The motor of an electrical appliance consumes 18 000 J. during itsoperation, 9450 J dissipated in heat, 250 J were used forproduce light and 350 J are required to power the electronic panel ofdevice. What is the fuel efficiency of the engine of this device ?An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compressionratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10minutes test the dynamometer scale beam reading was 42 kg and the engine consumed4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27C and 1 bar wassupplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find:(1) the brake power delivered (bp),(2) the brake mean effective pressure (bmep),(3) the brake specific fuel consumption (bsfc),(4) the brake specific air consumption (bsac),(5) the brake thermal efficiency (b, th),(6) the volumetric efficiency (vol), and(7) the air-fuel ratio (A/F) on mass basis.Draw the simplified schematic diagram of the plant showing all the necessary data displayed on it. "Please only draw on schematic diagram of the plant"An eight-cylinder, four-stroke engine of 9 cm bore and 8 cm stroke with a compressionratio of 7 is tested at 4500 rev/min on a dynamometer which has 54 cm arm. During a 10minutes test the dynamometer scale beam reading was 42 kg and the engine consumed4.4 kg of gasoline having a calorific value of 44000 kJ/kg. Air at 27C and 1 bar wassupplied to the carburettor at the rate of 6 kg/min. Take R for air = 287 kJ/(kg·K). Find: (4) the brake specific air consumption (bsac),(5) the brake thermal efficiency (b, th),(6) the volumetric efficiency (vol), and(7) the air-fuel ratio (A/F) on mass basis.Draw the simplified schematic diagram of the plant showing all the necessary data displayed on it.
- Hello i dont undertsnad the steps, where do they get the 0.13333 from?? and the 0.7?? can you explain those steps more clearly pleaseA wind turbine with an 24000 mm-radius rotor is rotating at 18 rpm under steady winds at an average velocity of 24 km/h. Assuming the turbine efficiency as 28.5 percent, determine (A) Power produced, in kW. if the electric power produced is sold to the consumers at 13.5 Baiza/kWh. (B)What will be the revenue generated by the wind energy per year? Take the density of air to be 1.225 kg/m3.A single cylinder reciprocating engine is to be balanced by 60% of the reciprocating parts and all the revolving parts. Il mass of reciprocating parts and revolving parts is 40 kg and 30 kg respective y, then mass to be balanced at the crank pin will be equal to?
- A pneumatic shock absorber consists of a cylinder with aradius of 1.50 cm and a length that varies from a maximum of 30.0 cmto a minimum of 30.0 cm/v, where v is the compression ratio. Forease of manufacturing, v must be an integer. When the cylinder isfully extended and cooled, the air inside has an ambient pressure of101 kPa and ambient temperature of 30.0C. A quick adiabatic compressionheats the air. The cylinder then expands isothermally untilit reaches its maximum length. At that time the length remains fixedand the cylinder cools isochorically, returning to the ambient temperature. How much work is done by the air during a full cycle, in terms of v?A pneumatic shock absorber consists of a cylinder with aradius of 1.50 cm and a length that varies from a maximum of 30.0 cmto a minimum of 30.0 cm/v, where v is the compression ratio. Forease of manufacturing, v must be an integer. When the cylinder isfully extended and cooled, the air inside has an ambient pressure of101 kPa and ambient temperature of 30.0C. A quick adiabatic compressionheats the air. The cylinder then expands isothermally untilit reaches its maximum length. At that time the length remains fixedand the cylinder cools isochorically, returning to the ambient temperature. If at least 25.0 J of work must be done by the gas in a full-compression cycle, what is the minimum allowable integer value of v?Energy balance results (in kW) obtained for the same medium speed single cylinder diesel engine are reported in the following table. For case 1, if the coolant temperature is 105 °C at the outlet of the engine and the volumetric flow rate is 0.22*10-3 m3/s, the temperature of the coolant at the inlet is (in °C): (The coolant is considered water with a density 999 kg/m3 and a specific heat 4.2 k/kg.K). Case N (rpm) bmep (bar) W. O ambient Q ahast shaft 2.2 4.2 19.1 60.3 9.90 3.52 1 500 7.1 24.5 23.8 500 6.1 3.6 5.2 400 3.50 4.9 4.1 1.4 Select one: O a. 142.1 O b. 112.7 O c. 97.31 O d. 87.2 O e. 370.31