If q" w = 5000 and the convection heat transfer coefficient at the pipe outlet is 1000 W/m2K, Determine the temperature at the inner surface of the pipe at the outlet.
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- 3. Saturated refrigerant 134a flows in the evaporator tube at 2 °C. The evaporator is made of thin copper tube with d=1 cm outer diameter. Aluminum annular fins having a diameter of D=2.5 cm are attached to the surface of the pipe. The ambient is at 25°C and the heat transfer coefficient is h-40. a. Determine the heat loss per unit length of the evaporator tube, if fins are 0.5 mm thick and the fin density is 200 fins per meter. 4. 3.142 -A 10 ft length of pipe with an inner radius of 1 in and outer radius of 1.25 in has an outer surface temperature of 250 F. The heat transfer rate is 30,000 BTU/hr. Find the interior surface temperature. Assume k = 25 BTU/hr-ft-F.Determine the transfer coefficient for water flowing through a 1-inch pipe.inch, 16 BWG and 3 m / s, if the tube temperature is 82 ° C and the water enters at 21 ° C and exitsat 55 ° C
- Water (5.2 L/min) is flowing in a tube "D= 3 cm, L= 5 m" and is to be heated from 15°C to 59.9°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? 0.8 II If turbulent flow use Dituss-Boetler relation Nu= 0.023 Re Pr. 3 Properties : p = 992.1 kg/m , C 4179 J/kg. °C, k=0.631 W/m°C, Pr= 4.32, v= 0.658E-6 m /s Select one:An electric generator at a power plant produces energy by passing superheated steam from a high temperature container (reservoir), through a pipe connected to a series of fans, and then into a low temperature reservoir. As the steam passes across the blades of the fans some of the heat energy of the steam is transformed into mechanical energy, which turns the fans which in turn are connected to a generator, which in turn converts the mechanical energy into electrical energy. If the high temperature steam has a temperature of 201.9 K and the low temperature reservoir has a temperature of 154.1 K, what is the Carnot efficiency of this process?Water (4.1 L/min) is flowing in a tube "D = 3 cm, L= 5 m" and is to be heated from 15°C to 59.8°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the ?resistance heater (kW) If turbulent flow use Dituss- Boetler relation Nu= 0.023 Re0.8 .Prn Properties : p = 992.1 kg/m³ , C, = 4179 J/kg.°C, k 0.631 W/m°C, Pr = 4.32, v = 0.658E-6 m²/s
- The surface temperature of a heater with a diameter of 50 mm in a horizontal position is 40°C. This heaterIt was immersed in water at 20°C. Find the heat lost per unit length of the heater.Water (5.0 L/min) is flowing in a tube "D = 3 cm, L= 5 m" and is to be heated from 15°C to 64.0°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? 00 0.8 If turbulent flow use Dituss-Boetler relation Nu= 0.023 Re Pr. 3 Properties : p = 992.1 kg/m ,C = 4179 J/kg. °C, k = 0.631 W/m°C, Pr= 4.32, v = 0.658E-6 1m/sn electric generator at a power plant produces energy by passing superheated steam from a high temperature container (reservoir), through a pipe connected to a series of fans, and then into a low temperature reservoir. As the steam passes across the blades of the fans some of the heat energy of the steam is transformed into mechanical energy, which turns the fans which in turn are connected to a generator, which in turn converts the mechanical energy into electrical energy. If the high temperature steam has a temperature of 412.1 K and the low temperature reservoir has a temperature of 105.4 K, what is the Carnot efficiency of this process?
- Water (7.7 L/min) is flowing in a tube "D = 3 cm, L= 5 m" and is to be heated from 15°C to 62.1°C by applying a uniform heat flux on the outer surface of the tube by electric resistance heater. What is the power rating of the resistance heater (kW)? If turbulent flow use Dituss- Boetler relation Nu= 0.023 Re0.8 Pr". Properties : p = 992.1 kg/m³ , C, = 4179 J/kg.°C, k = 0.631 W/m°C, Pr = 4.32, v = 0.658E-6 m²/sThe temperature of a hot gas stream flowing in a duct (90cm) length and (30cm) diameter is to be measured by using a spherical thermocouple junction (2mm) in diameter placed at the center of the duct. The duct wall is at (30 ° C) and the gas stream is at (110 ° C). If the heat is being transferred to the thermocouple at the rate of (560 W / m²) from the gas, and both the thermocouple and the duct are considered black, what will be the reading of the thermocouple?Consider a copper tube with domestic hot water flowing inside (Tin =70◦C, um = 0.5m/s). The inner diameter of the tube is Din=13mm and outer diameter is Dout=15mm. The tube is located in a crawlspace and the surrounding temperature is T∞ =0 ◦C. The inner and outer heat transfer coefficients are hin = 250W/m2K and hout = 5W/m2K. The tube is insulated at the outer surface with insulating foam of thickness lf oam=17.5mm. The temperature drop of the water along the tube is 0.5◦C. 1. Draw a sketch that indicates the dimensions of the system, and the directions of heat transfer and fluid flow. 2. What is the length of the tube?