Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is 294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(mK) and 0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K) and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be neglected.

Example 2.22: A steel pipe 25 mm internal diameter and 33 mm outer diameter and insulated with rockwool carries steam at 451 K (178°C). If the surrounding air temperature is 294 K (21°C), calculate the rate of heat loss from one metre length of pipe. The thickness of insulation is 38 mm. Thermal conductivities of steel and rockwool are 44.97 W/(mK) and 0.175 W/(m-K) respectively. The inside and outside heat transfer coefficients are 5678 W/(m²K) and 11.36 W/(m²K) respectively. Contact resistance between the pipe and insulation may be neglected.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

1Q
1- A pressure head of 1.5 m of fluid with a specific weight (v) 0.8 is equal to a. 14.7 kN/m2 b. 11.76 kpa с. 24.5 kN/m? d. 33.2 kpa
A 5 kW electric motor driving a pump has an efficiency of 85%. Determine the losses encountered in the driver. a. 2500 kJ/hr b. 48.00 kJ/min c. 0.78 kW d. 2700 kJ/hr
I need the answer as soon as possible
Home work/1: A fan with 24-in-diameter blades moves 2000 cfm (cubic feet per minute) of air at 70°F at sea level. Determine (a) the force required to hold the fan and (b) the minimum power input required for the fan. Choose a control volume sufficiently large to contain the fan, with the inlet sufficiently far upstream so that the gage pressure at the inlet is nearly zero. Assume air approaches the fan through a large area with negligible velocity and air exits the fan with a uniform velocity at atmospheric pressure through an imaginary cylinder whose diameter is the fan blade diameter?
Q1.docx > Q: Find the time required to empty a tank with water height (h=18) 8 ft A 20 ft circular hole
36 - Argon is heated at 340 K with a mass flow of 3 kg/s while passing through a pipe. Given that the heat taken by the argon is 29 kW and the flow is known to be continuous, which of the following is the temperature at the pipe outlet? (Cp = 0.5203 kJ/kgºC) a) 95.7 ºC B) 75.3 ºC NS) 358.6 ºC D) 85.6 ºC TO) 348.3 ºC
A) Define the type of flow using Reynolds number. B) Explain the significance of the information we get from Reynolds number equation. C) determine the rated power of the pump that needs to be purchased.
Water is flowing in a pipe that changes diameter from 30 to 40 mm. If inlet velocity is 50 m/s, determine a) outlet velocity b) the mass flow rate
Pls to step by step
Assignment I A pump supplies oil at 2.0 Lpm to a 4.5 cm diameter double-acting hydraulic cylinder. If the load is 4000 N (extending and retracting) and the rod diameter is 3.0 cm, find i) Hydraulic pressure during the extending stroke. ii) Piston velocity during the extending stroke iii) Cylinder kW power during the extending stroke iv) Hydraulic pressure during the retracting stroke. v) Piston velocity during the retracting stroke. vi) Cylinder kW power during the retracting stroke.