Water enters a 2.5-cm-internal-diameter thin copper tube of a heat exchanger at 15°C at a rate of 0.61 kg/s, and is heated by steam condensing outside at 115°C. If the average heat transfer coefficient is 950 W/m2.K, determine the length of the tube required in order to heat the water to 105°C. (Insert answer for Q (kW), TLMTD (°C) and L (m) ) kW m
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- Water enters a 2.5-cm-internal-diameter thin copper tube of a heat exchanger at 15oC at a rate of 0.61 kg/s, and is heated by steam condensing outside at 115oC. If the average heat transfer coefficient is 950 W/m2.K, determine the length of the tube required in order to heat the water to 109oC. (Insert answer for Q (kW), TLMTD (oC) and L (m) )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.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 enters a 2.5-cm-internal-diameter thin copper tube of a heat exchanger at 15 °C at a rate of 0.3 kg/s, and is heated by steam condensing outside at 120 °C. If the average heat transfer coefficient is 800 W/m²-K, determine the length of the tube required in order to heat the water to 115 °C. Steam -T, = 120°C 115°C Water 15°C D=2.5 cm 0.3 kg/sSteam in the condenser of a power plant is to be condensed at a temperature of 30°C with cooling water from a nearby lake, which enters the tubes of the condenser at 14°C and leaves at 22°C. The surface area of the tubes is 45 m2, and the overall heat transfer coefficient is 2100 W/m2?K. Determine the mass flow rate of the cooling water needed and the rate of condensation of the steam in the condenser.Steam is to be condensed on the shell side of a heat exchanger at 75°F. Cooling water enters the tubes at 50°F at a rate of 44 Ibm/s and leaves at 65°F. Assuming the heat exchanger to be well insulated, determine the rate of heat transfer in the heat exchanger and the rate of condensation of the steam. The specific heat of water is 1.0 Btu/lbm-°F and the enthalpy of vaporization of water at 75°F is 1050.9 Btu/lbm. The rate of heat transfer in the heat exchanger is The rate of condensation of the steam is lbm/s. Btu/s.
- A steam condenser operates at 61 cm of Hg vacuum. The steam enters the condenser with a moisture content of 87%. Cooling water is supplied to the condenser at a temperature of 20 C with a terminal difference of 5 C. The water velocity of water inside the tube is to be limited to 2.5 m/s when using 2.5 cm outside diameter tubes whose thickness is 1.75 mm. The overall heat transfer coefficient of the tubes could be approximated by the equation U = 1213.4(v1/2), W/(m2-C) where v is the water velocity in m/sec. Determine: 1. The required mass flow of cooling water, kg/s 2. The required capacity of the circulating pump, liter per second 3. The Logarithmic Mean Temperature Difference, C 4. The required Number of tubes 5. The required length of tubes, (m), and number of passesWater (Cp = 4180 J/kg-°C) enters the 2.5- cm internal-diameter tube of a double-pipe counter-flow heat exchanger at 17°C at a rate of 3 kg/s. It is heated by steam condensing at 120°C (hfg = 2203 kJ/kg) in the shell. If the overall heat transfer coefficient of the heat exchanger is 1500 W/m2-°C, determine the length of the tube required in order to heat the water to 80°C. msteam exits the turbine of a steam power plant at 105 F and is to be condensed in a large condenser by cooling water flowing through copper pipes (k = 223 Btu/h-ft-F) of inner diameter 0.5 in. and outer diameter 0.7 in. at an average temperature of 70 F. The heat transfer of vaporization of water at 100F is 1037 Btu/lbm. The heat transfer coefficient are 1500 Btu/h-ft-F on the steam side and 35 Btu/h-ft-F on the water side. Determine the length of the tube required to condense steam at arate of 130 lbm/h.
- 300960 W (e) Water is entering a heated tube at mass flow rate of 1.2 kg/s. The temperature at the inlet is 20°C and at the outlet is 80°C. Assume the surface temperature of the tube is 100°C. The convection coefficient of the water flow is 28 W/m².°c. The specific heat and density of water can be assumed to be 4180 J/kg.°C and 990 kg/m³. What is the rate of heat transfer to water during this process?Steam condenses at 100°C on the outer surface of a pipe with a thermal conductivity of 180 J/ms°C. The surface heat transfer coefficient of the water flowing in the pipe is 4000 J/m²s°C, and the heat transfer coefficient created by the steam condensing outside is 10000 J/m²s°C. The length of the pipe is 5 m and the thread diameter is 25 mm. Since the pipe thickness is 1 mm, calculate the total heat transfer coefficient and the rate of heat transfer from the condensed steam to the water at 15 °CWater at an average temperature of 110°C and an average velocity of 5.5 m/s flows through a 7-m-long stainless-steel tube (k = 14.2 W/m⋅K) in a boiler. The inner and outer diameters of the tube are Di = 1.0 cm and Do = 1.4 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho = 7200 W/m2⋅°C, determine the overall heat transfer coefficient Ui of this boiler based on the inner surface area of the tube. It is given that the properties of water at 110°C are (Table A-9) ν=μρ=0.268×10−6 m2/s , k = 0.682 W/m⋅°C, and Pr = 1.58. The overall heat transfer coefficient of this boiler is _____ W/m2⋅°C.