BODY:\({r_{cr,cylinder}} = \frac{k}{h}\)where, k = conductivity of insulation, h = convective heat TRANSFER coefficient of OUTER bodyCalculation:Given:k = 0.06 W/mK, h = 10 W/m2KCritical radius for cylinder\(\begin{array}{l} {r_c} = \frac{{{k_{insulation}}}}{{{h_{outside}}}}\\ = \frac{{0.06}}{{10}} = 0.006\;m = 6~mm \END{array}\)

"> BODY:\({r_{cr,cylinder}} = \frac{k}{h}\)where, k = conductivity of insulation, h = convective heat TRANSFER coefficient of OUTER bodyCalculation:Given:k = 0.06 W/mK, h = 10 W/m2KCritical radius for cylinder\(\begin{array}{l} {r_c} = \frac{{{k_{insulation}}}}{{{h_{outside}}}}\\ = \frac{{0.06}}{{10}} = 0.006\;m = 6~mm \END{array}\)

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The figure below shows a cross section through an insulated heating pipe which is made from steel (k = 45 W/mK) with an inner radius of 150 mm and outer radius of 155 mm. The pipe is coated with 100 mm thickness of insulation having thermal conductivity of k = 0.06 W/mK. Air at inlet temperature Ti = 60°C flow through the pipe has a value of convective coefficient hi = 35 W/m2K. The outside surface of the pipe is surrounded by air which is at 15°C and convective heat transfer coefficient on this surface has a value of ho = 10 W/m2K. Find the critical insulation radius?

General Knowledge General Awareness in General Knowledge 11 months ago

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Concept:The insulation radius at which resistance to heat flow is minimum and consequently heat flow rate is maximum is called “critical radius”.The critical radius of insulation for a cylindrical BODY:\({r_{cr,cylinder}} = \frac{k}{h}\)where, k = conductivity of insulation, h = convective heat TRANSFER coefficient of OUTER bodyCalculation:Given:k = 0.06 W/mK, h = 10 W/m2KCritical radius for cylinder\(\begin{array}{l} {r_c} = \frac{{{k_{insulation}}}}{{{h_{outside}}}}\\ = \frac{{0.06}}{{10}} = 0.006\;m = 6~mm \END{array}\)

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Posted on 23 Nov 2024, this text provides information on General Knowledge related to General Awareness in General Knowledge. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.

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