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An array of electrical heating elements is used in an air-duct heater as shown in Fig. P7130. Each element has

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An array of electrical heating elements is used in an air-duct heater as shown in Fig. P7–130. Each element has a length of 250 mm and a uniform surface temperature of 350°C. Atmospheric air enters the heater with a velocity of 12 m/s and a temperature of 25°C. Determine the total heat transfer rate and the temperature of the air leaving the heater. Neglect the change in air properties as a result of temperature change across the heater. Evaluate the air properties at an assumed mean temperature of 35°C and 1 atm. Is this a good assumption?

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24 mm ↓ ↓↓ 24 mm Air T₁= 25°C V = 12 m/s ↓↓ To T, = 350°C D = 12 mm (L = 250 mm)

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Total heat transfer rate The total heat transfer rate can be calculated using the following equation Q hA T s T m where Q is the total heat transfer r…View the full answer


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Related Book For  answer-question
Heat And Mass Transfer Fundamentals And Applications

Heat And Mass Transfer Fundamentals And Applications

ISBN: 9780073398181

5th Edition

Authors: Yunus Cengel, Afshin Ghajar

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Question Details
Chapter # 7- EXTERNAL FORCED CONVECTION
Section: Problems
Problem: 130
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Question Posted: September 15, 2023 10:21:13
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