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Q.2 A steel pipe (I.D. = 50 mm, O.D. = 55 mm) is insulated with magnesia insulation [k = 0.02 W/(m °C)]. The temperature at the interface between the pipe and the insulation is 280°C. The allowable heat loss by conduction from the insulated pipe is 550 W/m length of pipe. For safety, the temperature of the outside surface of the insulation must not exceed 50°C. Determine: (i) The minimum thickness of insulation required, (ii) The temperature of the inside surface of the pipe assuming its thermal conductivity k = 45 W/(m °C). Draw the thermal circuit of the %3D insulated pipe giving the values of all temperatures and thermal resistances.

Q.2 A steel pipe (I.D. = 50 mm, O.D. = 55 mm) is insulated with magnesia insulation [k = 0.02 W/(m °C)]. The temperature at the interface between the pipe and the insulation is 280°C. The allowable heat loss by conduction from the insulated pipe is 550 W/m length of pipe. For safety, the temperature of the outside surface of the insulation must not exceed 50°C. Determine: (i) The minimum thickness of insulation required, (ii) The temperature of the inside surface of the pipe assuming its thermal conductivity k = 45 W/(m °C). Draw the thermal circuit of the %3D insulated pipe giving the values of all temperatures and thermal resistances.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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إضافة ملف Q.2 A steel pipe (1.D. = 50 mm, O.D. = 55 mm) is insulated with magnesia insulation [k = 0.02 W/(m °C)]. The temperature at the interface between the pipe and the insulation is 280°C. The allowable heat loss by conduction from the insulated pipe is 550 W/m length of pipe. For safety, the temperature of the outside surface of the insulation must not exceed 50°C. Determine: (i) The minimum thickness of insulation required, (ii) The temperature of the inside surface of the pipe assuming its thermal conductivity k = 45 W/(m °C). Draw the thermal circuit of the insulated pipe giving the values of all temperatures and thermal resistances.
Transcribed Image Text:إضافة ملف Q.2 A steel pipe (1.D. = 50 mm, O.D. = 55 mm) is insulated with magnesia insulation [k = 0.02 W/(m °C)]. The temperature at the interface between the pipe and the insulation is 280°C. The allowable heat loss by conduction from the insulated pipe is 550 W/m length of pipe. For safety, the temperature of the outside surface of the insulation must not exceed 50°C. Determine: (i) The minimum thickness of insulation required, (ii) The temperature of the inside surface of the pipe assuming its thermal conductivity k = 45 W/(m °C). Draw the thermal circuit of the insulated pipe giving the values of all temperatures and thermal resistances.
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