Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22C. the outside temperature is -4 °C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network: (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window (iv) the temperature of the inner surface of the window.

Consider a room with a 1.8-m-high and 2.0-m-wide double- pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m? K and 25 W/m? K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22C. the outside temperature is -4 °C and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network: (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window (iv) the temperature of the inner surface of the window.

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

Related questions

Q: from the back side of the board to a medium at 37°C, with a heat transfer coefficient of 45 W/m²-K.…

Q: A homeowner wants to reduce their monthly heating bill and carbon footprint and is considering…

Q: The door of a 1 m long by 27.5 cm wide oven is made up of 2 AISI 1010 carbon steel plates of…

Q: The free convection heat transfer coefficient on a thin hot vertical plate suspended in still air…

Q: 5 A double glazed window of 1.5 m² surface consists of two layers of glass (k = 0.78 W m-¹ K-¹) each…

Q: Silver shafts of 0.1 m diameter are heat treated in a gas-fired furnace whose gases are at 1200 K…

Q: the outer surface temperature of the furnace should be kept below 45°C. Based on the above…

Q: During a testing of a insulating fabric for winter clothing, the fabric is wrapped over a…

Q: The 3-layer wall consists of glass-air-glass and the thickness is 2 cm, 5 cm, and 2 cm,…

Q: Consider a thin suspended hotplate that measures 0.25 mx 0.25 m. The isothermal plate has a mass of…

Q: An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the…

A: The objective of the question is to understand the relative temperatures of the internal and…

Q: An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the…

A: The objective of the question is to determine the heat energy gained per hour through all 4 walls of…

Q: Consider a 1.5-m-high and 2.4-m-wide double-pane window consisting of two 3-mm-thick layers of glass…

A: In this problem, we will calculate the steady rate of heat transfer and the inner surface…

Q: Consider a thin suspended hotplate that measures 0.4 mx 0.4 m. The isothermal plate has a mass of…

Q: A common annoyance in cars during winter is the formation of fog on the glass surfaces that blocks…

Question

100%

Consider a room with a 1.8-m-high and 2.0-m-wide double-
pane window consisting of two 4-mm-thick layers of glass
separated by a 10-mm-wide stagnant air space. The
convection heat transfer coefficients on the inner and outer
surfaces of the window are 12 W/m? K and 25 W/m? K,
respectively, while the average thermal conductivity of glass is
0.78 W/m K; and the air, 0.026 W/m K.
(a)
If the room is maintained at 22 C, the outside temperature is
-4 C and heat transfer due to radiation can be neglected,
determine:
(i)
Draw the sketch and thermal resistance network
(ii)
the total thermal resistance;
the steady rate of heat transfer through this double-pane
window
(ii)
(iv)
the temperature of the inner surface of the window.
If a fuel contains 86% C, 9% H2, 1% S and 4% ash (silica) by
mass, determine:
(b)
(i)
the total oxygen needed;
(ii)
the total air needed;
(iii)
the stoichiometric air/fuel ratio.
Page 2 of 5
D Focus
ENG
99+

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

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

A household oven door of 0.4 m height and 0.6 m width reaches an average surface temperature of 50°C during operation. Estimate the total heat loss to the room with ambient air at 22°C and convective heat transfer coefficient 5 W/m².K, if the door has an emissivity of 0.83 and the surroundings are also at 22°C.
1. (a) Consider a room with a 1.8-m-high and 2.0-m-wide double-pane window consisting of two 4-mm-thick layers of glass separated by a 10-mm-wide stagnant air space. The convection heat transfer coefficients on the inner and outer surfaces of the window are 12 W/m2 K and 25 W/m2 K, respectively, while the average thermal conductivity of glass is 0.78 W/m K; and the air, 0.026 W/m K. If the room is maintained at 22 oC, the outside temperature is -4 oC and heat transfer due to radiation can be neglected, determine: (i) Draw the sketch and thermal resistance network; (ii) the total thermal resistance; (iii) the steady rate of heat transfer through this double-pane window; (iv) the temperature of the inner surface of the window.…
A mercury-in-glass thermometer having a diameter of 6 mm is placed in a verti- cal position to measure the air temperature in a metal warehouse in the summer. The walls of the warehouse are at 50°C. The convection coefficient is 7 W/m² - °C, and the emissivity of the thermometer may be taken as € = 0.9. Calculate the temperature indicated by the thermometer if the air temperature is 32°C.
An industrial cold room has four 200 mm thick walls made of concrete. The walls are insulated on the outside with a layer of foam 60 mm thick. Cladding with a thickness of 15 mm protects the foam on the outside from the elements. The composite wall surface temperatures are –3 °C on the inside and 18 °C on the outside of the room respectively. The thermal conductivities of concrete, foam and cladding are 0.75, 0.35 and 0.5 W/m K respectively. Assuming perfect thermal contact between the layers of the composite walls, draw the typical temperature distribution across the layers and determine the heat energy gained per hour through all 4 walls of the room with a total surface area of 20 m2. What does this heat energy represent in terms of the refrigeration system of the cold room?
A certain building wall consists of 6-in of concrete ( k = 1.2 W/m-oC), 2-in of fiberglass insulation ( k = 0.026 W/m-0C), and 3/8-in of gypsum board ( k = 0.05 W/m-oC).The inside and outside convection coefficients are 2.0 and 7.0 BTU/hr-ft2-oF, respectively. The outside air temperature is 72 oF and the inside air temperature is 20 oF. Calculate the Rvalue, overall heat transfer coefficient and the heat loss per for 1 m2 area of the wall. (Four Decimal Places for final answer)