HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT
HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT
6th Edition
ISBN: 9781260699326
Author: CENGEL
Publisher: MCG
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Textbook Question
Chapter 1, Problem 128P

An engine block with a surface area measured to be 0.95 m2 generates a power output of 50 kW with a net engine efficiency of 35 percent. The engine block operates inside a compartment at 157 o C,  and the average convection heat transfer coefficient is 50 W/m2. K. If convection is the only heat transfer mechanism occurring, determine the engine block surface temperature.

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Consider a person standing in a breezy room at 20°C. Determine the total rate of heat transfer from this person if the exposed surface area and the average outer surface temperature of the person are 1.6 m2 and 29°C, respectively, and the convection heat transfer coefficient is 6 W/m2 ·°C (Fig. 2–75).
An engine block with a surface area measured to be 0.95 m2 generates a power output of 50 kW with a net engine efficiency of 35%. The engine block operates inside a compartment at 157°C and the average convection heat transfer coefficient is 50 W/m2·K. If convection is the only heat transfer mechanism occurring, determine the engine block surface temperature.
For heat transfer purposes, a standing man can be modeled as a 30-cm-diameter, 175-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 10 W/m2 ·°C, determine the rate of heat loss from this man by convection in an environment at 20°C.

Chapter 1 Solutions

HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT

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  • 1.)For heat transfer purposes, a standing man can be modeled as a 34.17-cm-diameter, 173.37-cm-long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34.46°C. For a convection heat transfer coefficient of 14.33 W/m2 · °C, determine the rate of heat loss from this man by convection in an environment at 20.36°C. 2.)Consider a 1,499.74-kg car cruising at constant speed of 73.89 km/h. Now the car starts to pass another car, by accelerating to 111.73 km/h in 5.84 s. Determine the additional power needed to achieve this acceleration.
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