1. COMBINED CONDUCTION CONVECTION ON CYLINDRICAL WALL A hot-water pipe (k = 60 W/m K) in a house, made of 3/4-inch schedule 40 pipe (OD = 26.7 mm; thickness = 2.87 mm) is 15 meters long and contains water at 50 C. The air around the pipe is at 24 C. The heat transfer coefficient inside and outside the pipe are 1,135 W/m² K and 17 W/m²K, respectively. Insulation with thermal conductivity of 20 W/m K is to be added to the pipe. Determine the percent reduction of heat loss from the pipe due to insulation of 130 mm thick. hot water Qo air 24 C 50 C r2 BARE PIPE (w/o insulation) Q air insulation hot water pipe r2 ri PIPE with insulation
1. COMBINED CONDUCTION CONVECTION ON CYLINDRICAL WALL A hot-water pipe (k = 60 W/m K) in a house, made of 3/4-inch schedule 40 pipe (OD = 26.7 mm; thickness = 2.87 mm) is 15 meters long and contains water at 50 C. The air around the pipe is at 24 C. The heat transfer coefficient inside and outside the pipe are 1,135 W/m² K and 17 W/m²K, respectively. Insulation with thermal conductivity of 20 W/m K is to be added to the pipe. Determine the percent reduction of heat loss from the pipe due to insulation of 130 mm thick. hot water Qo air 24 C 50 C r2 BARE PIPE (w/o insulation) Q air insulation hot water pipe r2 ri PIPE with insulation
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.19P: 1.19 A cryogenic fluid is stored in a 0.3-m-diameter spherical container is still air. If the...
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