To determine The rate of radiation heat transfer between the person and the surrounding surface in summer and winter. Explanation Given: Emissivity ( ε ) is 0.95 . Surface temperature ( T s ) is 32 ° C . Surface area ( A s ) is 1.6 m 2 . Surrounding temperature in summer is 23 ° C . Surrounding temperature in winter is 12 ° C . Calculation: Determine the rate of radiation heat transfer. Q ˙ rad = ε σ A s ( T s 4 − T surr 4 ) = 0.95 × 5.67 × 10 − 8 W / m 2 ⋅ K 4 × 1.6 m 2 [ ( 32 ° C + 273 K ) 4 − ( 23 ° C + 273 K ) 4 ] = 84

Fundamentals Of Thermal-fluid Sciences In Si Units

5th Edition

ISBN: 9789814720953

Author: Yunus Cengel, Robert Turner, John Cimbala

Publisher: McGraw-Hill Education

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Chapter 16, Problem 84RQ

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The rate of radiation heat transfer between the person and the surrounding surface in summer and winter.

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Chapter 16, Problem 83RQ

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One thousand kg/h of a (50-50 wt%) acetone-in-water solution is to be extracted at 25C in a continuous, countercurrent system with pure 1,1,2-trichloroethane to obtain a raffinate containing 10 wt% acetone. Using the following equilibrium data, determine with an equilateral-triangle diagram: a- the minimum flow rate of solvent; b- the number of stages required for a solvent rate equal to 1.5 times minimum, and composition of each streamleaving each stage. c- Repeat the calculation of (a) and (b) if the solvent used has purity 93wt% (4wr% acetone, 3wt% water impurities) acetone water 1,1,2-trichloroethane Raffinate. Weight Extract. Weight 0.6 0.13 0.27 Fraction Acetone Fraction Acetone 0.5 0.04 0.46 0.44 0.56 0.4 0.03 0.57 0.29 0.40 0.3 0.02 0.68 0.12 0.18 0.2 0.015 0.785 0.0 0.0 0.1 0.01 0.89 0.55 0.35 0.1 0.5 0.43 0.07 0.4 0.57 0.03 0.3 0.68 0.02 0.2 0.79 0.01 0.1 0.895 0.005

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Chapter 16 Solutions

Fundamentals Of Thermal-fluid Sciences In Si Units

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