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A garage (24 ft * 24 ft * 10 ft) is illuminated by six 60-W incandescent bulbs. It is estimated that 90% of the energy to an incandescent bulb is dissipated as heat. If the bulbs are on for 3 hours, how much would the temperature in the garage increase because of the light bulbs (assuming no energy losses). Complete an Excel worksheet like the one illustrated in Figure 1.71 to answer this question. Potentially useful information: • Air density (approximate): 1.2kg/m3 • Air heat capacity (approximate): 1000 joules/kg K • 3.28 ft = 1 m

A garage (24 ft * 24 ft * 10 ft) is illuminated by six 60-W incandescent bulbs. It is estimated that 90% of the energy to an incandescent bulb is dissipated as heat. If the bulbs are on for 3 hours, how much would the temperature in the garage increase because of the light bulbs (assuming no energy losses). Complete an Excel worksheet like the one illustrated in Figure 1.71 to answer this question. Potentially useful information: • Air density (approximate): 1.2kg/m3 • Air heat capacity (approximate): 1000 joules/kg K • 3.28 ft = 1 m

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1.3 Temperature Increase due to Incandescent Lighting When energy is added to a fluid, the temperature of the fluid increases. An egua- tion describing this phenomenon is Q = M Cp AT where Q is the amount of energy added (joules) is the mass of the fluid (kg) is the heat capacity of the fluid (joules/kg K) is the change in temperature (K, or °C) M. AT A garage (24 ft * 24 ft * 10 ft) is illuminated by six 60-W incandescent bulbs. It is estimated that 90% of the energy to an incandescent bulb is dissipated as heat. If the bulbs are on for 3 hours, how much would the temperature in the garage increase because of the light bulbs (assuming no energy losses). Complete an Excel worksheet like the one illustrated in Figure 1.71 to answer this question. Potentially useful information: • Air density (approximate): 1.2kg/m • Air heat capacity (approximate): 1000 joules/kg K • 3.28 ft = 1m B F Figure 1.71 Garage temperature change calculation. 1 Temperature Change in a Garage When Lights Left On 3 Specified Information 4 Number of Bulbs: 6 Bulb Power: 60 W 6 Bulb Percent Power Loss as Heat: 90% Bulbs on Time: 3 hrs 5760 ft 1.2 kg/m 1000 joules/kg K Garage Air Volume: 9 Air Density: Air Heat Capacity: 10 11 12 Calculated Information 13 Total Bulb Power: 14 Total Bulb Power Lost as Heat: 15 Total Bulb Power Lost as Heat: joules/second 16 Total Bulb Energy Lost as Heat: joules Garage Air Volume: m 17 Garage Air Mass: Temperature Change: 18 kg 19 K 20
Transcribed Image Text:1.3 Temperature Increase due to Incandescent Lighting When energy is added to a fluid, the temperature of the fluid increases. An egua- tion describing this phenomenon is Q = M Cp AT where Q is the amount of energy added (joules) is the mass of the fluid (kg) is the heat capacity of the fluid (joules/kg K) is the change in temperature (K, or °C) M. AT A garage (24 ft * 24 ft * 10 ft) is illuminated by six 60-W incandescent bulbs. It is estimated that 90% of the energy to an incandescent bulb is dissipated as heat. If the bulbs are on for 3 hours, how much would the temperature in the garage increase because of the light bulbs (assuming no energy losses). Complete an Excel worksheet like the one illustrated in Figure 1.71 to answer this question. Potentially useful information: • Air density (approximate): 1.2kg/m • Air heat capacity (approximate): 1000 joules/kg K • 3.28 ft = 1m B F Figure 1.71 Garage temperature change calculation. 1 Temperature Change in a Garage When Lights Left On 3 Specified Information 4 Number of Bulbs: 6 Bulb Power: 60 W 6 Bulb Percent Power Loss as Heat: 90% Bulbs on Time: 3 hrs 5760 ft 1.2 kg/m 1000 joules/kg K Garage Air Volume: 9 Air Density: Air Heat Capacity: 10 11 12 Calculated Information 13 Total Bulb Power: 14 Total Bulb Power Lost as Heat: 15 Total Bulb Power Lost as Heat: joules/second 16 Total Bulb Energy Lost as Heat: joules Garage Air Volume: m 17 Garage Air Mass: Temperature Change: 18 kg 19 K 20
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