Steam, initially saturated at 2.28 MPa, passes through a 10 cm standard steel pipe for a total distance of 150 m. The steam line is insulated with 5 cm thickness of fiberglass insulation (k = 0.043 W/m-K). For an ambient temperature of 30°C, neglecting steam surface coefficient, what is the quality of the steam which arises at its destination if the mass flow rate is 0.15 kg steam per second? Note: ho for still air is 9.36 W/m²-K
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- 8. Steam initially saturated at 2.05 MPa, passes through a 10.1 cm standard steel pipe for a total distance of 152 m. The steam line is insulated with a 5.08 cm thickness material of k = 0.069 W/m- o K and exposed to the atmosphere whose temperature is 22 o C and h = 9.36 W/m 2 -K. What is the quality ofsteam which arises at its destination if the mass flow rate is 0.125 kg of steam per second? (At 2.05 MPa, t sat = 213.67 o C, h f = 914.52 kJ/kg, h g = 2800 kJ/kg.Consider a flow of water in a cylinder maintained at a constant temperature of 1000 C, the diameter of the cylinder is 50 mm and the length of the tube is 6m. The inlet and the outlet temperature of the water are Ti = 150 C and T0 = 570 C . Find the average heat transfer coefficient associated with the flow of water. Mass flow rate is 0.25 Kg/ s and Cp = 4.178 KJ/Kg.KWater is to be heated from 20 to 60 0C as it flows through a thick-walled tube having inner and outer diameters of 20 mm and 40 mm, respectively. The tube is equipped with an electrical heating which provides uniform heating throughout the surface of the tube at a rate of 20 kW/m2. Assume that steady-state conditions are achieved and the outer surface of the heater is well insulated. (a) For a mass flow rate of 0,15 kg/s, how long must the tube be to achieve the desired outlet temperature? (b) Calculate the inner surface temperature at the tube inlet.
- Q5 c) Water is to be heated from 10°C to 80°C as it flows through a 2-cm-internal-diameter, 7-m- long tube. The tube is equipped with an electric resistance heater, which provides uniform heating throughout the surface of the tube. The outer surface of the heater is well insulated, so that in steady operation all the heat from the heater is transferred to the water in the tube. If the system is to provide hot water at a rate of 8 L/min, determine the convection heat transfer coefficient and temperature at the inner surface of the pipe at the exit. d) Hot air at atmospheric pressure and 85°C enters a 10-m long uninsulated square duct of cross section 0.15m x 0.15m that passes through the attic of a house at a rate of 0.1 m/s. The duct is observed to be nearly isothermal at 60°C. Determine the rate of heat loss from the duct to the air space in the attic.Water (T = 20°C) from a reservoir is pumped up at 5 kg/s through a 3-in Sch. 40 pipe connected to a storage tank of relatively large area. The tank is 7 m from the reservoir where the pump is placed on its side delivering 30 kW of power. The fluid absorbs heat at 3.5 kW. Illustrate and determine the temperature at the receiver tank.Consider a flow of water in a cylinder maintained at constant temperature of 100° C, the diameter of the cylinder is 50 mm and the length of the tube is 6 m. The inlet and the outlet temperature of the water is T, = 15° C and T, =57°C. Find the average heat transfer coefficient associated with the flow of water. Mass flow rate is 0.25 kg/s and c, = 4.178 kJ/kg·K. C (A)850 W/m² - K (B 650 W/m2 .K (C)755 W/m? · K (D) 725 W/m².K
- Q3. White potatoes (k = 0.50 W/m. °C and a = 0.13 x 106 m²/s) that are initially at a uniform temperature of 25°C and have an average diameter of 6 cm are to be cooled by refrigerated air at 2°C flowing at a velocity of 4 m/s. The average heat transfer coefficient between the potatoes and the air is experimentally determined to be 19 W/m². °C. Determine how long it will take for the center temperature of the potatoes to drop to 6°C.Q1. Cooling water available at 10°C is used to condense steam at 30°C in the condenser of a power plant at a rate of 0.15 kg/s by circulating the cooling water through a bank of 5-m- long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water, the tubes, and the number of tubes needed to achieve the indicated heat transfer rate in the condenser. Q2. A concentric annulus tube has inner and outer diameters of 25 mm and 100 mm, respectively. Liquid water flows at a mass flow rate of 0.05 kg/s through the annulus with the inlet and outlet mean temperatures of 20°C and 80°C, respectively. The inner tube wall is maintained with a constant surface temperature of 120°C, while the outer tube surface is insulated. Determine the length of the concentric annulus tube. Assume flow is fully developed. T Insulation…Q1. Cooling water available at 10°C is used to condense steam at 30°C in the condenser of a power plant at a rate of 0.15 kg/s by circulating the cooling water through a bank of 5-m- long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water, the tubes, and the number of tubes needed to achieve the indicated heat transfer rate in the condenser.
- High-pressure steam condenses at 400 K on the outer surface of a thin-walled tube of 50 mm diameter. The overall heat transfer coefficient between steam and air on the inside of the tube is 200 W/m?. If the air enters the tube at 25 m/s, 150 kPa and 280 K, find the length of the tube required for the air to be heated to 350 K.In a large student house in Sheffield, cold water is supplied by the mains water supply at a pressure of 2 bar, gauge, and at a temperature 10°C. A wash basin cold tap is located 3 meters above the mains supply, connected to the mains pipe with a copper pipe of internal diameter 15 mm and length 12 meters. When the tap is opened the flow rate of water out of the tap is 24 litres per minute, creating a Fanning friction factor in the pipe of 0.008. а) Calculate the Reynolds number of the water in the pipe and determine if it is laminar or turbulent. b) Calculate the pressure loss from friction, change in elevation, and hence the pressure of the water just before entering the tap. c) Name two assumptions that have been made in order to arrive at your answer to part b) and state if these assumptions under or over predict the pressure of the water just before entering the tap. d) If the value were not given, what procedure would be needed to determine the Fanning friction factor?In a large student house in Sheffield, cold water is supplied by the mains water supply at a pressure of 2 bar, gauge, and at a temperature 10°C. A wash basin cold tap is located 3 meters above the mains supply, connected to the mains pipe with a copper pipe of internal diameter 15 mm and length 12 meters. When the tap is opened the flow rate of water out of the tap is 24 litres per minute, creating a Fanning friction factor in the pipe of 0.008. a) Calculate the Reynolds number of the water in the pipe and determine if it is laminar or turbulent.