To maintain pump power requirements per unit flow rate below an acceptable level, operation of (he oil pipeline of Problem 8.63 is subject (o the constraint that the oil exit temperature
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Fundamentals of Heat and Mass Transfer
- (Q1) A small reservoir based plant is planned in a remote location to supply water into a micro turbine to generate electricity. The height of water level in reservoir is 10 m. The micro turbine is to be located at ground level at a distance of 200 m from the reservoir. To generate sufficient power, the minimum head (total head) required at the turbine inlet is 9 m with the flow rate of 0.4 m3/s. The loss coefficient (KL) at the inlet to the pipe from reservoir is calculated as 0.4. Determine the minimum diameter of the cast iron pipe (roughness, e = 0.26 mm) required for the proposed design. Take following properties of the fluid: density (EGL). 1000 kg/m3, viscosity = 0.001 kg/m-s. Draw hydraulic grade line (HGL) and energy grade line Reservoir H = 10 m Inlet, K, = 0.4 Pipe Turbine 200 marrow_forwardAssuming the clearance is negligible for a single stage compressor with the followingdata.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K Calculatate the following 1 )Evaluate the mass flow rate of air inside the compressor operating isentropically in kg/min to 3 decimal places. 2 ) What is the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal? 3 ) What is the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1.25?arrow_forwardWhat is the engine bore (in mm) required for good volumetric efficiency for an engine with two inlet and two exhaust valves, stroke of 90 mm, inlet air temperature of 332 K, exhaust temperature of 900 K, engine speed of 8200 rpm and exhaust valve diameter Assume specific heat ratio =1.3, R = 287 J/kg.K, and an average inlet flow coefficient 0.4 and an average exhaust flow coefficient 0.5. mm (each). Select one: O a. 96.57 O b. 70.23 O c. 105.2 O d. 91.05 O e. 82.71arrow_forward
- Water is to be supplied to the inhabitants of a college hostel through a supply main. The following data are given : Distance of the reservoir from the hostel = 4000 m. Number of inhabitants = 3000. consumption of water per day %3D of each inhabitant = 180 litre, loss of head due to friction = 18 m, coefficient of friction for the pipe f = 0.007 if %3D the half of the daily supply is pumped in 8 hrs, determine the size of the supply main.arrow_forward(b) Figure 3 shows a pump with 80% efficiency (no) delivers 50 Liter/s of water at 20°C from tank 1 to tank 2. The pipeline has 150 mm diameter with a length of 200 m made of galvanised steel. Evaluate the input power to an electric motor of 90% (nm) efficiency that connected to the pump. The globe valve used is % wide open. 2 100 m GLOBE VALVE PRESSURE GAUGE МОTOR PUMParrow_forwardTwo-phase pipeline with 0.2 m diameter and 3000 m length. The inlet pressure = 2300 kPa, liquid flow rate = 0.01 m³/s, volumetric Gas Oil Ratio = 44, pr-680 kg/m³, pg-0.93 kg/m³, gas viscosity-0.015x10-³ Pa.s, and liquid viscosity = 9.4x103 Pa.s. If new gas pipeline with flow rate (0.09 m³/s) connects to the middle of the existing pipeline, calculate the pressure at the outlet of existing pipeline?arrow_forward
- An engine cooling system consists of the following components and associated losses; Engine Block and Head, HL=12.2m Radiator, HL=15.3m 5 x Elbows, CL=1.3 3 x Junctions, C_=1.2 3 Meters of piping, C = 9.5 x 103, Diameter = 40mm Given that the flow rate of coolant through the cooling system is 50L/min determine the total head loss associated with the system. Take the density of water to be 1000kg/m3 and g = 9.81 m/s?. Select one: O a. 31.79m O b. 29.79m O c. 27.79m O d. 25.79marrow_forwardAssuming the clearance is negligible for a single stage compressor with the following data.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.What is the power input to the compressor in kW to 3 decimal places if the compression reversible isothermal?arrow_forwardFor an inlet valve, the mass flow rate through the valve is 0.44 kg/s. The flow coefficient is 0.62 and the cylinder pressure is 105 kPa. Assume intake system pressure and temperature are 180 kPa and 527 K, the specific heat ratio is 1.3 and R =287 J / kg.K. The area of the valve is (SI unit): Select one: a. 2.30*10-3 O b. 3.45*10-2 O c. 1.43*10-3 O d. 1.75*10-3 O e. 0.85*10-2arrow_forward
- Assuming the clearance is negligible for a single stage compressor with the following data.Atmospheric pressure: 90 kPaAtmospheric temperature: 17 ˚CDelivery pressure: 7 barFree air delivery flow rate: 0.2 m3/minTake “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K 1.What is the power input to the compressor in kW to 2 decimal places if the compression is polytropic compression process with n=1.25?arrow_forward2. In the gasoline transfer facility the storage tank to the consumption tank, you want to install a pump to circulate a flow rate of 40. The 400m long pipe is cast iron 150mm in diameter and consists of a check valve, a gate valve and 2 commercial medium radius elbows. The Kg consumption tank is pressurized to 2.5 pressure cm gauge. Determine the power Additional data, pressure drop factors: pump drive in KW if the pump performance is 68%. . Check valve X = 1.8 • Open gate valve K, = 0.25 • Medium radius commercial elbow K = 0.75, for each elbow Outlet storage pond angles alive k, = 0.5 • Entrance to the consumption tank K₂ = 1 • Friction factor in pipes / = 0.025arrow_forwardPUMP SYSTEM – SYSTEM CURVE AND NPSH The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m3/h. SUCTION PIPE Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m3/h starting at 0 (7-point curve) 2. Would you advise the client to select the p400 or ¢460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: the gauge pressure in the suction tank at 115 kPa, the vapour pressure of the water at its average operating temperature at 20C suction height as 1.5 m. 3. Is the pump likely to cavitate? Support…arrow_forward
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