11.5 A heat recovery device involves transferring energy from the hot flue gases passing through ...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 55-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel ( k = 50 W/m·K). Consider conditions for...
A heat recovery device involves transferring energy from the hot flue gases passing through an annular region to pressurized water flowing through the inner tube of the annulus. The inner tube has inner and outer diameters of 24 and 30 mm and is connected by 8 struts to an insulated outer tube of 65-mm diameter. Each strut is 3 mm thick and is integrally fabricated with the inner tube from carbon steel (k = 50 W/m-K). 71-1=3 mm D. D.2...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diameter D, = 20 mm and an outer tube of diameter Do-80 mm. Saturated steam flows through the inner tube, maintaining its surface at uniform temperature of T,i 100°C, while the outer surface of the outer tube is well insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet...
A simple counter flow heat exchanger consists of two co-axial tubes with hot process water passing through the inner tube and clean water through the annular space between the inner and outer tubes. The clean water enters at 20°C and leaves at 50°C. The process water enters at 90°C and leaves at 40°C. The mass flowrate of the process water is 3 kgs-1. The inner tube diameter is 30 mm and the outer tube diameter is 50 mm. Take the...
A flue passing hot exhaust gases has a square cross section, 300 mm to a side. The walls are constructed of refractory brick 150 mm thick with a thermal conductivity of 1.6 W/m·K. Calculate the heat loss from the flue per unit length when the interior and exterior surfaces are maintained at 350 and 25°C, respectively. Use a grid spacing of 75 mm. Assume the temperature in nodes 2 and 3 are given as T2 = 108.3°C, T3 = 162.2°C....
A heat exchanger has Di 1 = 20 mm, Di2 = 33 mm, D = 64 mm, and L = 2.2 m. The walls and the 8 struts of a heat exchanger are made of carbon steel (k=50 W/m K). Liquid water at 300 K (u = 855x10 6 Ns/m2) enters the inner tube with a flow rate of 0.019 kg/s. Calculate the heat transfer coefficient for the inner tube. 1-1 = 3 mm D. Dia Dia Water Gas
Calculate the heat losses that are transferred to the open air of 1m from an uninsulated pipe with diameter d1 (inner diameter = 150 mm) and d2 (outer diameter = 165 mm) when water with an average temperature T1 runs through it. = 90 ° C and the ambient temperature Ta = -15 ° C. The coefficient of thermal conductivity of the tube material is K = 50 W / m ° C. The heat transfer coefficient for water and...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
Water enters through a thick-walled tube having inner and outer diameters of 19 and 38 mm and 20 m long The inlet temperature is Tmi=17℃ and outlet temperature is Tmo = 50°C. The outer surface of the tube is well Insulated, and electrical heating within the wall provides for a uniform generation rate of q = 8X105 W/m3. If the inner surface temperature of the tube Ts = 60 °C at the outlet what is the local convection heat transfer...