Question

(a) Calculate the rate of heat conduction (in W) through house walls that are 15.0 cm...

(a)

Calculate the rate of heat conduction (in W) through house walls that are 15.0 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 115 m2 and their inside surface is at 19.0°C, while their outside surface is at 5.00°C.

W

(b)

How many 1 kW room heaters would be needed to balance the heat transfer due to conduction? (Round your answer to the next whole integer.)

1 kW room heaters

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Calculate the rate of heat conduction (in W) through house walls that are 14.5 cm thick...
Calculate the rate of heat conduction (in W) through house walls that are 14.5 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 145 m2 and their inside surface is at 21.5°C, while their outside surface is at 5.00°C. How many 1 kW room heaters would be needed to balance the heat transfer due to conduction? (Round your answer to the...
Uniform area, heat transfer problem A stove's walls are made up of a flat inner insulating...
Uniform area, heat transfer problem A stove's walls are made up of a flat inner insulating board 0.01m thick (thermal conductivity: 0.2 W m-1K-1) and a flat outer steel sheet 0.01m thick (thermal conductivity: 26 W m-1K-1). A mineral-wool (thermal conductivity: 0.065 W m-1K-1) is placed between these sheets. The inside temperature of the wall is 773K, how thick does the insulation have to be to maintain the outside wall temperature at 323K ? Assume that the ambient air temperature...
A house has well-insulated walls 15.0 cm thick (assume conductivity of air) and area 500 m2...
A house has well-insulated walls 15.0 cm thick (assume conductivity of air) and area 500 m2 , a roof of wood 5.0 cm thick and area 270 m2 , and uncovered windows 0.55 cm thick and total area 30 m2 . I don't need help with question A, I got it right but i don't know how to do b and c A) Assuming that heat is lost only by conduction, calculate the rate at which heat must be supplied...
On a cold night the temperatures of the two surfaces of a glass windowpane in a...
On a cold night the temperatures of the two surfaces of a glass windowpane in a house are 7.8° C on the outer surface and 8.0° C on the inner surface when the air temperature is 0° C outside and 25.0° C inside. The glass is 2.73 mm thick. (The thermal conductivity for glass is 0.8 W/m-C°.) (a) Find the rate at which heat is conducted through the glass per square meter of window area. (b) Find the value of...
A 2 cm thick steel pipe (thermal conductivity = 43 W/[m.C]) with 6 cm inside diameter...
A 2 cm thick steel pipe (thermal conductivity = 43 W/[m.C]) with 6 cm inside diameter is being used to convey steam from a boiler to process equipment for a distance of 40 m. The inside pipe surface temperature is 115 degrees C, and the outside pipe surface temperature is 90 degrees C. Calculate the total heat loss to the surroundings under steady-state conditions.
consider a 0.8 cm thick steel plate with a thermal conductivity of 50W/m-k.When the inside surface...
consider a 0.8 cm thick steel plate with a thermal conductivity of 50W/m-k.When the inside surface of the plate is subjected to a uniform heat flux 0f 5*104 w/m2 the oter surface temperature of the plate is measured to be 110c under steady operating condition a)express the differential equation and the boundary conditions for steady one dimensional heat conduction through the wall b)obtain the relation for the variation of temperature in the plate by solving the differential equation. c)evaluate the...
You want to limit the heat flux density (heat intensity) by a wall to 10 W...
You want to limit the heat flux density (heat intensity) by a wall to 10 W / (m2). The outside temperature is 4 ° C and the internal temperature 37 ◦C. How thick should a steel wall (λ = 17, 3 W / (m · K)) be to meet requirements? How thick must a mineral wool disk (λ = 0, 038 W / (m · K) be) to give the same greatest heat intensity? Disregard the heat transfer rates between...
A house with 200-m2 floor space is heated with geothermal water flowing through pipes laid in...
A house with 200-m2 floor space is heated with geothermal water flowing through pipes laid in the ground under the floor. The walls of the house are 4 m high, and there are 8 single-paned windows in the house that are 1.2 m wide and 1.8 m high. The house has R-4 insulation (where R= 1/U is the overall unit thermal resistance(the R-value) and U is the overall heat transfer coefficient) in the walls and R-5 on the ceiling. The...
In the first lesson we talk about the heat transfer that takes place in the human...
In the first lesson we talk about the heat transfer that takes place in the human body, but the same types of transfer occur for any object. For the following question, use the dimensions and characteristics of your own home. It’s reasonable to assume that walls are thick enough to block direct heat loss to radiation (without prior conduction through the walls). Windows are relatively thin in comparison and conduct more heat than walls (i.e. a double-pane glazed window has...
Q. Unsteady conduction A large steel plate 0.02 m thick leaves a heat treating furnace at...
Q. Unsteady conduction A large steel plate 0.02 m thick leaves a heat treating furnace at 425 oC. And the plate is plunged into water (at 25 oC) and cooled from both sides. How long does it take for the maximum temperature to reach 65 oC? For steel plate: thermal conductivity, k=30 W/m·K, density ?=7600 kg/m3, heat capacity cp=700 J/kg·K. Heat transfer coefficients: h=6000 W/m2·K in water. Please use two methods to calculate this question: (1) Directly apply the exact...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT