G.?"Which matcrial has the higher themal conductivity'?d: 5.(ht What is the overall heat-transfer coefficicnt U? Describe a physical situation,inす 5コ .:-which it could be used.石:.5 .(c) A standard Schedule 405 cm steel pipe (inside diameter 5.25 cm and wall thickness040 cm) čarrying steam is lagged (i.e insulated) with 5.0 cm of 85 per cent magnesia covered inturn with 5.0 cm of cork. Estimate the heat loss per hour per meter of pipc if the inner surface ofthe pipe is at 120°C and the outer surface of the cork is at 32°C. The thermal conductivitics ofthe substances concerned are9.ofMaterialThermal Conductivity[Watts/ha K]Steel4585% Magnesia(0.07Cork0.05Atいい1

Q. a) Given: which material has higher thermal conductivity.

うー。 Which matcrial has the higher themal conductivity? (b) What is the overall heat-transfer coefficicnt U? Describe a physical situationin vhich it could be used. そ. 。 (c) A standard Schedule 405 cm steel pipe (inside diameter 5.25 cm and wall thickness D.40 cm) čarrying steam is lagged (i.e insulated) with 5.0 cm of 85 per cent magnesia covered in urn with 5.0 cm of cork. Estimate the heat loss per hour per meter of pipc if the inner surface of the pipe is at 120°C and the outer surface of the cork is at 32°C. The thermal conductivitics of the substances concerned are Thermal Conductivity Material [Watts/ha K] Steel 45 85% Magnesia 0.07 Cork 0.05 At it

うー。 Which matcrial has the higher themal conductivity? (b) What is the overall heat-transfer coefficicnt U? Describe a physical situationin vhich it could be used. そ. 。 (c) A standard Schedule 405 cm steel pipe (inside diameter 5.25 cm and wall thickness D.40 cm) čarrying steam is lagged (i.e insulated) with 5.0 cm of 85 per cent magnesia covered in urn with 5.0 cm of cork. Estimate the heat loss per hour per meter of pipc if the inner surface of the pipe is at 120°C and the outer surface of the cork is at 32°C. The thermal conductivitics of the substances concerned are Thermal Conductivity Material [Watts/ha K] Steel 45 85% Magnesia 0.07 Cork 0.05 At it

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.43P

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Table Q3 is given to collect the temperature of hot and cold water at the inlet and outlet positions in the laboratory using Tube Heat Exchanger (TD360a) by varying the cold-water flow rate to investigate the effect of cold-water flow rate on the heat exchanger’s performance. (a) Complete all the output parameters indicated in the table given in Appendix 1. (b) Draw the temperature (TH1, TH2, TC1 and TC2) on the vertical vs position (1, 2) on the horizontal axis for each flow and discuss the effect of cold water flow rate change on the exit temperature of both cold water and hot water. (c) Draw the graph of Energy Balance Coefficient and Mean Temperature Efficiency on vertical axis and cold-water flow rate on horizontal axis. Discuss the effect of flow rate on the Energy Balance Coefficient and Mean Temperature Efficiency based on your finding.
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