Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
2. The cabin air in an empty aircraft on the ground in a tropical country is maintained at a constant 21°C (=T) by air-conditioning when the outside temperature is 35°C (=Ta). The radius of the fuselage is 3.7m (=r), the thermal conductivity of the cabin wall is 0.4 W/m.K (=k)and the heat transfer coefficients are 9 (=h) and 39 (=ha) W/m.K for the air in the cabin and the external atmosphere respectively. Assume that the effects of radiation are negligible. (a) Draw a sketch of the fuselage showing the dimensions, heat transfers, temperatures as well as the values of thermal conductivity and heat transfer coefficients. Identify the types of heat transfer occurring and express them in terms of the appropriate temperatures and constants of proportionality. Identify the relationships between the temperature differences associated with the heat transfers; and, hence show that the heat transfer unit length of fuselage (b) (c) is (Ta-Te) = = 2ar: Aha'k'hc If the air-conditioning unit is 50% efficient and the fuselage is 40m long and its wall thickness is 0.1m, then how much power is required to maintain these conditions? (d) [Answer: 43.3 kW]

2. The cabin air in an empty aircraft on the ground in a tropical country is maintained at a constant 21°C (=T) by air-conditioning when the outside temperature is 35°C (=Ta). The radius of the fuselage is 3.7m (=r), the thermal conductivity of the cabin wall is 0.4 W/m.K (=k)and the heat transfer coefficients are 9 (=h) and 39 (=ha) W/m.K for the air in the cabin and the external atmosphere respectively. Assume that the effects of radiation are negligible. (a) Draw a sketch of the fuselage showing the dimensions, heat transfers, temperatures as well as the values of thermal conductivity and heat transfer coefficients. Identify the types of heat transfer occurring and express them in terms of the appropriate temperatures and constants of proportionality. Identify the relationships between the temperature differences associated with the heat transfers; and, hence show that the heat transfer unit length of fuselage (b) (c) is (Ta-Te) = = 2ar: Aha'k'hc If the air-conditioning unit is 50% efficient and the fuselage is 40m long and its wall thickness is 0.1m, then how much power is required to maintain these conditions? (d) [Answer: 43.3 kW]

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
See similar textbooks
icon
Related questions
Question
Q2 please
A SIIICUII Cip mcuJung J m substrate. In a steady state, the chip has an electrical power input of 0.3W. The top surface of the chip is exposed to a coolant whose temperature is 20°C. The heat transfer coefficient for convection between the chip and coolant is 150 W/(m².K). (а) Draw a sketch of the chip showing the dimensions, an appropriate system boundary and energy transfers across the boundary. If the heat transfer by conduction between the chip and substrate is negligible, determine the surface temperature of the chip. (b) [Answer: 86.7°C] 2. The cabin air in an empty aircraft on the ground in a tropical country is maintained at a constant 21°C (=T.) by air-conditioning when the outside temperature is 35°C (=Ta). The radius of the fuselage is 3.7m (=r), the thermal conductivity of the cabin wall is 0.4 W/m.K (=k)and the heat transfer coefficients are 9 (=h) and 39 (=ha) W/m.K for the air in the cabin and the external atmosphere respectively. Assume that the effects of radiation are negligible. (a) Draw a sketch of the fuselage showing the dimensions, heat transfers, temperatures as well as the values of thermal conductivity and heat transfer coefficients. Identify the types of heat transfer occurring and express them in terms of the appropriate temperatures and constants of proportionality. Identify the relationships between the temperature differences associated with the heat transfers; and, hence show that the heat transfer unit length of fuselage (b) (c) is (Ta-Tc) ģ = 2nr : ha If the air-conditioning unit is 50% efficient and the fuselage is 40m long and its wall thickness is 0.1m, then how much power is required to maintain these conditions? (d) [Answer: 43.3 kW]
Transcribed Image Text:A SIIICUII Cip mcuJung J m substrate. In a steady state, the chip has an electrical power input of 0.3W. The top surface of the chip is exposed to a coolant whose temperature is 20°C. The heat transfer coefficient for convection between the chip and coolant is 150 W/(m².K). (а) Draw a sketch of the chip showing the dimensions, an appropriate system boundary and energy transfers across the boundary. If the heat transfer by conduction between the chip and substrate is negligible, determine the surface temperature of the chip. (b) [Answer: 86.7°C] 2. The cabin air in an empty aircraft on the ground in a tropical country is maintained at a constant 21°C (=T.) by air-conditioning when the outside temperature is 35°C (=Ta). The radius of the fuselage is 3.7m (=r), the thermal conductivity of the cabin wall is 0.4 W/m.K (=k)and the heat transfer coefficients are 9 (=h) and 39 (=ha) W/m.K for the air in the cabin and the external atmosphere respectively. Assume that the effects of radiation are negligible. (a) Draw a sketch of the fuselage showing the dimensions, heat transfers, temperatures as well as the values of thermal conductivity and heat transfer coefficients. Identify the types of heat transfer occurring and express them in terms of the appropriate temperatures and constants of proportionality. Identify the relationships between the temperature differences associated with the heat transfers; and, hence show that the heat transfer unit length of fuselage (b) (c) is (Ta-Tc) ģ = 2nr : ha If the air-conditioning unit is 50% efficient and the fuselage is 40m long and its wall thickness is 0.1m, then how much power is required to maintain these conditions? (d) [Answer: 43.3 kW]
Expert Solution
steps

Step by step

Solved in 5 steps with 1 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Dimensional Analysis
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS