by what factor would the rate of heat transfer be reduced if a double glazed window...
by what factor would the rate of heat transfer be reduced if a double glazed window with a U value of 3.84w/(m2k) was used instead of a single glazed window with an U value of 5.90 w/(m2k)?
Homework Answers
heat transfer is reduced by a
factor of (0.35) i.e. by
35%....Add Answer to:
by what factor would the rate of heat transfer be reduced if a
double glazed window...
(a) Calculate the rate of heat conduction (in W) through a double-paned window that has a...
(a) Calculate the rate of heat conduction (in W) through a double-paned window that has a 5.00 m2 area and is made of two panes of 0.700 cm thick glass separated by a 1.00 cm air gap. The inside surface temperature is 17.0°C, while that on the outside is −20.0°C. (Hint: There are identical temperature drops across the two glass panes. First find these and then the temperature drop across the air gap. This problem ignores the increased heat transfer...
What is the rate of heat transfer due to conduction through a single-pane glass window that...
What is the rate of heat transfer due to conduction through a single-pane glass window that is 3.0 m2 and 3.175 mm thick, when the exterior temperature is 37°C and the interior temperature is 24°C?
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
(a) Calculate the rate of heat conduction (in w) through a double-paned window that has a...
(a) Calculate the rate of heat conduction (in w) through a double-paned window that has a s.00 m2 area and is made of two panes of 0.700 cm thick glass separated by a 1.00 cm air gap. The nside surface temperature is 16.0*C, while that on the outside is-1S.0 C (Hnt: There are identical temperature drops across the two glass panes. First find these and then the temperature drop across the ar gap. This problem ignores the increased heat transfer...
I figured out the first question but im not sure how to answer question 2 and 3?
i
figured out the first question but im not sure how to answer
question 2 and 3?
i
have figured out question 2. Question #3 is what is diffcult to
grasp because i have to guess my Fo #. Fo=time
1. To reduce building heating costs, modern building codes in many parts of the country require the use of double-pane windows (sometimes, called "double-glazed" or "thermopane" windows). Some of In one design of a double-pane window, each glass layer is...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width o...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width of 1.25 in. around the outside edge. The top of the window has a 1.5 ft overhang that extends a great distance on each side of the window. The incident angle is 60 deg, the incident direct irradiation is 120 Btu/hr-ft, and the incident diffuse irradiation is 50 Btu/hr-ft. 1- Compute the shaded area of the frame and glazing on July...
Compute the ratio of the rate of heat loss through a single-pane window with area 0.15...
Compute the ratio of the rate of heat loss through a single-pane window with area 0.15 m2 to that for a double-pane window with the same area. The glass of a single pane is 4.4 mm thick, and the air space between the two panes of the double-pane window is 6.50 mm thick. The glass has thermal conductivity 0.80 W/m⋅K. The air films on the room and outdoor surfaces of either window have a combined thermal resistance of 0.15 m2⋅K/W
Heat Loss Through Thermopane Double Window. A double window called thermopane is one in which two...
Heat Loss Through Thermopane Double Window. A double window called thermopane is one in which two layers of glass dry stagnant air. In a given window, each of the glass layers is 6.35 mm thick separated by a 6.35 mm space of stagnant air. The thermal conductivity of the glass is 0.869 W/m K and that of air is 0.026 over the temperature range used For a temperature drop of 27.8 K over the system, calculate the heat loss for...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat exchanger heats air which flows on the shell side. The tubes are bras with outside diameter of 2.6 cm and are 6.7m long. The heat transfer coefficients on the inside and outside tube surfaces are 470 W/m2K and 210 W/m2K, respectively. Air enters the unit at 15°C with a flow rate of 16 kg/s. The entering water temperature is 350K. A) Draw and label...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting o...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
(a) Calculate the rate of heat conduction (in w) through a double-paned window that has a s.00 m2 area and is made of two panes of 0.700 cm thick glass separated by a 1.00 cm air gap. The nside surface temperature is 16.0*C, while that on the outside is-1S.0 C (Hnt: There are identical temperature drops across the two glass panes. First find these and then the temperature drop across the ar gap. This problem ignores the increased heat transfer...
i
figured out the first question but im not sure how to answer
question 2 and 3?
i
have figured out question 2. Question #3 is what is diffcult to
grasp because i have to guess my Fo #. Fo=time
1. To reduce building heating costs, modern building codes in many parts of the country require the use of double-pane windows (sometimes, called "double-glazed" or "thermopane" windows). Some of In one design of a double-pane window, each glass layer is...
A 2 ft high x 6 ft wide double-glazed window faces southwest. The window has a frame with width of 1.25 in. around the outside edge. The top of the window has a 1.5 ft overhang that extends a great distance on each side of the window. The incident angle is 60 deg, the incident direct irradiation is 120 Btu/hr-ft, and the incident diffuse irradiation is 50 Btu/hr-ft. 1- Compute the shaded area of the frame and glazing on July...
Heat Loss Through Thermopane Double Window. A double window called thermopane is one in which two layers of glass dry stagnant air. In a given window, each of the glass layers is 6.35 mm thick separated by a 6.35 mm space of stagnant air. The thermal conductivity of the glass is 0.869 W/m K and that of air is 0.026 over the temperature range used For a temperature drop of 27.8 K over the system, calculate the heat loss for...
Water flowing at a rate of 10 kg/s through 50 tubes in a double-pass shell-and-tube heat exchanger heats air which flows on the shell side. The tubes are bras with outside diameter of 2.6 cm and are 6.7m long. The heat transfer coefficients on the inside and outside tube surfaces are 470 W/m2K and 210 W/m2K, respectively. Air enters the unit at 15°C with a flow rate of 16 kg/s. The entering water temperature is 350K. A) Draw and label...
Thermal Resistance Analysis: Consider a 1.2 m high and 1.4 m wide double-pane window consisting of two 4 mm thick layers ofglass (k-0.85 W m-K) separated by a 8-min stagnant air space. (k= 0.025 W m-K) Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner and outer surfaces on a day when the inside room temperature is maintained at 20 °C and the outside ambient temperature is 32 °C. Assume the convection...
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