Question

In: Mechanical Engineering

A double pane window consists of two pieces of glass each of 8 mm thick that...

A double pane window consists of two pieces of glass each of 8 mm thick that enclose an air space of 8 mm thick. The window separates room air at 18°C from outside ambient air at -8°C. The convection coefficient associated with the inner (room-side) surface is 12W/m2 .K. The thermal conductivity of the glass is kg=1.35 W/m. K and that of the air is ka=0.027 W/m. K Q1- If the outside air convection coefficient is ho = 76 W/m2 .K what is the heat loss through a window that is 0.8 m long by 0.5 m wide? Neglecting radiation and assume the air enclosed between the panes to be stagnant. Q2- We consider now that the heat transfer in the air gap is transferred by conduction and radiation and that the radiation coefficient hrad = 3 W/m2 K . Show the thermal circuit representing the steady state situation and define the new heat transfer loss through the window.
(Non-anonymous question )
Your name and file upload actions will be recorded in OneDrive and visible to the form owner.

Solutions

Expert Solution

samet mamat answered 7 months ago
Next > < Previous

Related Solutions

A double pane window consists of two pieces of glass each of 8 mm thick that...
A double pane window consists of two pieces of glass each of 8 mm thick that enclose an air space of 8 mm thick. The window separates room air at 18°C from outside ambient air at -8°C. The convection coefficient associated with the inner (room-side) surface is 12W/m2 .K. The thermal conductivity of the glass is kg=1.35 W/m. K and that of the air is ka=0.027 W/m. K Q1- If the outside air convection coefficient is ho = 76 W/m2...
A thermopane window consists of two pieces of glass each 0.1" thick separated by a layer...
A thermopane window consists of two pieces of glass each 0.1" thick separated by a layer of dry, stagnant air .4" thick. • Find the resistance of a 4 ft × 3 ft thermopane window. • Suppose the window is made by fastening an aluminum border .1" thick all around the edge. Find the total resistance for this configuration. • As an alternative to the aluminum, we might use a border of .75" thick white pine. Find the total resistance...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0 cm...
A thermopane window consists of two glass panes, each 0.50 cm thick, with a 1.0 cm thick sealed layer of air in between a) if the inside surface temperature is 22.2 c and the outside surface temperature is 0.0 c determine the rate fo energy transfer through 1.35 m^2 of the window _______W b) compare your answer to a) with the rate of energy transfer through 1.35 m^2 of a single 1.0 cm thick pane fo glass. Disregard surface air...
Consider a single pane glass window that has an area of 8ft^2 and is 3/16” thick....
Consider a single pane glass window that has an area of 8ft^2 and is 3/16” thick. The outside temperature is -10oC and the inside temperature is 21oC. [9] a.How much heat flows through the window in 8 hours? Use an R-value. b. In reality, all surfaces have a thin layer of air covering them that does not move. This air“film” is about .0005m thick. Calculate how much heat flows through the window in the 8 hour period with the addition...
The inner and outer surface temperatures of a glass window 5 mm thick are 15 and...
The inner and outer surface temperatures of a glass window 5 mm thick are 15 and 5°C. The thermal resist- ance of the glass window due to conduction is Rt,cond = 1.19 × 10−3 K/W. What is the rate of heat loss through a 1 m × 3 m window? What is the thermal conductivity of the glass?
A wall in a house contains a single window. The window consists of a single pane...
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.16m^2 and whose thickness is 2.0 mm. Treat the wall as a slab of the insulating material styrofoam whose are and thickness are 18m ^ 2 and 0.10 m, respectively. Heat is lost via conduction through the wall and the window. The temperature difference between the inside and outside is the same for the wall and the window. Of...
Consider a double-pane window of size 48.56×73.55 cm. The window is framed in aluminum. If the...
Consider a double-pane window of size 48.56×73.55 cm. The window is framed in aluminum. If the maximum and minimum outside temperatures are 30.28 and -32.21 °C, respectively, how much gap do you need to allow between the glass panes and the frame?
The variation of the spectral transmissivity of a 0.6cm thick glass window is 0.92 in the...
The variation of the spectral transmissivity of a 0.6cm thick glass window is 0.92 in the wavelength range from 0.3-3micrometer. Determine the average transmissvity of this window for solar radiation at T=5800K. Also, determine the amount of solar radiation transmitted through the window for incident solar radiation of 650W/m2.
Double glazing consists of two layers of glass separated by an air gap. Which of the...
Double glazing consists of two layers of glass separated by an air gap. Which of the following statements about double glazing is the most correct? Group of answer choices A thicker air gap reduces convection and has no significant effect on conduction A thinner air gap reduces convection and has no significant effect on conduction A thicker air gap reduces both convection and conduction A thicker air gap reduces convection but increases conduction A thinner air gap reduces both convection...
A laser beam enters a 19.0 cm thick glass window at an angle of 39.0° from...
A laser beam enters a 19.0 cm thick glass window at an angle of 39.0° from the normal. The index of refraction of the glass is 1.50. At what angle from the normal does the beam travel through the glass? Tries 0/20 How long does it take the beam to pass through the plate?
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT