a. Explanation Given information: The temperature of surrounding air is 20 ° C . The temperature of surrounding walls is 25 ° C . Convection heat transfer coefficient is 10 W/m 2 .K Emissivity of ice is 0 .95 . Dimension of ice rink is 12m × 40m . Calculations: Surface area of ice rink is 12 × 40=480m 2 . Heat if transferred from the ice through convection and radiation. Rate of heat transfer by convection ( Q ) = hA s Δ T Where, ( Δ T ) = Temperature difference between ice and surrounding air= ( 20 − 0 ) = 20 ° C ( A s ) = Surface area of ice rink = 480 m 2 ( h ) = Heat transfer coefficient=10W/m 2 .K ⇒ Q = hA s Δ T Putting the values in the equation, we get, ⇒ Q = 10 × 480 × 20 ⇒ Q = 96000 W Rate of heat transfer by radiation is = ε σ A ( T 1 4 − T 2 4 ) Where, T 1 =Temperature of surrounding wall b. To determine The time required to melt 3mm of ice from the surface of rink if no refrigeration is done.

6th Edition

ISBN: 9780073398198

Author: CENGEL

Publisher: RENT MCG

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Question

Chapter 1, Problem 138P

To determine

The refrigeration load of the system necessary to maintain ice of the rink at 0°C .

To determine

The time required to melt 3mm of ice from the surface of rink if no refrigeration is done.

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Chapter 1, Problem 137P

Chapter 1, Problem 139P

Chapter 1 Solutions

HEAT+MASS TRANSFER:FUND.+APPL.

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Ch. 1 - Prob. 11CP Ch. 1 - An ideal gas is heated from 50C to 80C (a) at...Ch. 1 - What is heat flux? How is it related to the heat...Ch. 1 - What are the mechanisms of energy transfer to a...Ch. 1 - A logic chip used in a computer dissipates 3 W of...Ch. 1 - Consider a 150-W incandescent lamp. 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What...Ch. 1 - Consider a house in Atlanta, Georgia, that is...Ch. 1 - Prob. 120P Ch. 1 - A 4m5m6m and room is to be heated by one ton (1000...Ch. 1 - Engine valves (cp=440J/kg.Kandp=7840kg/m3) are to...Ch. 1 - Prob. 123P Ch. 1 - Prob. 124P Ch. 1 - A 0.3 -cm-thick, 12-cm-high, and 18-cm-long...Ch. 1 - A 40-cm-long, 800-W electric resistance heating...Ch. 1 - It is well known that wind makes the cold air feel...Ch. 1 - An engine block with a surface area measured to be...Ch. 1 - Prob. 129P Ch. 1 - Prob. 130P Ch. 1 - Prob. 131P Ch. 1 - Consider a person standing in a room maintained at...Ch. 1 - Prob. 133P Ch. 1 - Prob. 134P Ch. 1 - Prob. 135P Ch. 1 - Prob. 136P Ch. 1 - Prob. 137P Ch. 1 - Prob. 138P Ch. 1 - Prob. 139P Ch. 1 - Prob. 140P Ch. 1 - Prob. 141P Ch. 1 - Prob. 142P Ch. 1 - A 2-kW electric resistance heater submerged in...Ch. 1 - Prob. 144P Ch. 1 - A cold bottled drink (m=2.5kg,cp=4200J/kg.K) at...Ch. 1 - Prob. 146P Ch. 1 - Air enters a 12-m-long, 7-cm-diameter pipe at 50oC...Ch. 1 - Prob. 148P Ch. 1 - Steady heat conduction occurs through a...Ch. 1 - Heat is lost through a brick wall (k=0.72W/m.K),...Ch. 1 - Prob. 151P Ch. 1 - A 40-cm-long, 0.4-cm-diameter electric resistance...Ch. 1 - Prob. 153P Ch. 1 - Prob. 154P Ch. 1 - Over 90 percent of the energy dissipated by an...Ch. 1 - On a still, cleat night, the sky appears to be a...Ch. 1 - Prob. 157P Ch. 1 - Prob. 158P Ch. 1 - A persons head can be approximated as a...Ch. 1 - A person standing in a room loses heat to the air...Ch. 1 - Write an essay on how microwave ovens work, and...Ch. 1 - Using information form the utility bill for the...Ch. 1 - It is well know that at the same outdoor air...

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