Find the thermal resistance r (in hr - *F/BTU) and the equivalent R-value (in hr ft?. °F/BTU) of a typical frame 20' x 7.5" wall consisting of a 0.5" plaster board on the inside of the room, nominai 2 x 4 studs, and a 0.5" sheathing on the outside. The spaces between the studs are filled with an R-15 insulating foam. What is the heat loss (in BTU) through this wall in four hours if the inside temperature is 72°F and the outside temperature is 32°F? (Assume that the 15% of the wall's area are studs and the remaining 85% is filled with the insulating foam. Assume that the air is moving outside the wall.) r- 0.0805 x hr F/BTU R=0.09 x hr ft2. °F/BTU AQ = BTU

Find the thermal resistance r (in hr - *F/BTU) and the equivalent R-value (in hr ft?. °F/BTU) of a typical frame 20' x 7.5" wall consisting of a 0.5" plaster board on the inside of the room, nominai 2 x 4 studs, and a 0.5" sheathing on the outside. The spaces between the studs are filled with an R-15 insulating foam. What is the heat loss (in BTU) through this wall in four hours if the inside temperature is 72°F and the outside temperature is 32°F? (Assume that the 15% of the wall's area are studs and the remaining 85% is filled with the insulating foam. Assume that the air is moving outside the wall.) r- 0.0805 x hr F/BTU R=0.09 x hr ft2. °F/BTU AQ = BTU

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: A brick wall 3 m high, 7.5 m wide, and 160 mm thick has a thermal conductivity of 0.7 W/(m-°C). The…

Q: under steady-state conditions. If you are given /1 = 200 and 12 = 164 a) the conduction heat flux,…

A: Given, T1= 200°C T2=164°C T∞=20°C Length of the prism (L)= 50mm Thermal conductivity k=100W/mk…

Q: 2. Calculate the heat loss for the structure described below. Use the indoor design setpoint of…

A: The objective of this question is to calculate the heat loss for a given structure using the given…

Q: 16. The figure below shows three different arrangements of materials 1, 2, form a wall. The thermal…

A: Given∆T=20°C k1>k2>k3

Q: Crude oil is transported from a storage to a refinery through a 10" schedule 40 pipeline which is…

A: To Find : The amount of heat lost from pipeline.Given : The temperature of crude oil is The…

Q: What Tj, Tr. and Tj in the wall shown? are 2 cm 6 cm 4 cm 4 cm k = 5 W/m°c k = 4 W/m°C W 12 m:c k =…

Q: To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity…

A: I Hope its helpfull.thank you.

Q: 1- Consider steady- state conduction for one-dimensional conduction in a plane wall having a thermal…

A: Assuming:1.steady state1-D conductioninternal heat generation = 0Heat flux is given…

Q: 1.42 As shown in Fig. P1.42, a small-diameter water pipe passes through the 6-in.-thick exterior…

A: Given:Thickness of wall, L=6 in=6*0.0254 m=0.1524 mTemperature at x=0; T1=20oCTemperature at x=6 in;…

Q: Consider a copper plate that has dimensions of 3 cm x 3 cm x 7 cm (length, width, and thickness,…

A: Given data Dimension of plate = 3cm × 3cm × 7cm Density of copper = 8900 kg/sec Energy per second =…

Q: The temperature at the inside surface of an oven is 460 oF. The inside wall of the oven is made of…

A: Given Temperature, T1 = 460oF T2 = 100oF Area, A = 2ft2…

Q: Consider a thick cylindrical wall with insulation at both the inner and outer walls. The inner and…

A: Given: Tin= 80°CT∞=25°CRth1 = 2.6565×10-3 °CWRth2 = 9.193×10-3 °CWRth3 = 2.6565×10-3 °CWRconv =…

Q: Calculate the rate of steady heat transfer from a 8 m-by-10 m roof of a building during a cold…

Q: Determine the heat conduction of a boiler if you are given the following data: The thickness of the…

Q: Part A If the temperature of the room is 20°C and outside is 10°C, find the rate of heat flow for a…

Q: Task 5 Considering multi-mechanical systems involved in heat engine as shown in figure 4 to…

Q: A pressure spring type thermometer having a time constant of 1.7s is placed in boiling water at a…

Question

Find the thermal resistance r (in hr - °F/BTU) and the equivalent R-value (in hr ft?. °F/BTU) of a typical frame 20' x 7.5" wall
consisting of a 0.5" plaster board on the inside of the room, nominai 2 x 4 studs, and a 0.5" sheathing on the outside. The spaces
between the studs are filled with an R-15 insulating foam. What is the heat loss (in BTU) through this wall in four hours if the
inside temperature is 72°F and the outside temperature is 32°F? (Assume that the 15% of the wall's area are studs and the
remaining 85% is filled with the insulating foam. Assume that the air is moving outside the wall.)
r= 0.0805
x hr: OF/BTU
R=0.09
x hr ft2. F/BTU
AQ =
BTU

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 4 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

Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 100 Wm? C. The convection coefficient on the outside is 10 W/n C. The pipe is covered with a layer of asbestos. 1-determine the thickness of the asbestos layer at the critical insulation radius of the pipe. 2-calculate the change percent of heat transfer with and without the insulation. 3-commet on your results,
A wall of a house is made from two layers of bricks enclosing a layer of insulation. A radiator is positioned to cover the whole internal surface, and used intermittently when the internal temperature is low. The external surface is exposed to the outside air. Which of the following assumptions could be used to identify the relevant reduced form of the conduction equation to find the temperature in the wall. a. Conduction is mainly in two directions. b. Conduction is mainly in one direction. c. The wall properties are homogeneous. d. Steady conditions exist. e. Unsteady conditions exist. f. There is an internal volumetric heat generation in the wall.
A team of students tests a material for its thermal conductivity (k). After 20 minutes in a heat box, the temperature is 48° C inside the box and 28° C on top of the material. The following data is true about this test: Area of material = .0225 m2 Thickness of material = .0127 m Light bulb = 25 W What is the thermal conductivity constant for the material? Calculate the amount of energy transferred through the material. Determine the R-value of the material. Based on your calculations, would the material be a reasonable choice for home insulation? Yes of No
Which of the following statements are correct in the context of thermal conductivity? (Check all that apply.) Check All That Apply The thermal conductivity of gases is proportional to the square root of absolute temperature. The thermal conductivity of liquids is proportional to the square root of absolute temperature. The thermal conductivity of most liquids decreases with increasing temperature. The thermal conductivity of most liquids increases with increasing temperature.
An office space of 15 ft x12 ft x10 ft height. The heat loss through walls is (6949.8 Btuh) if Tb.l.=80 F , To= -10 F , and Uwall=0.143 Btu/hr.ft2.F ? True or false
1
Insulating material is used to reduce heat loss from the heating furnace walls to the room. The surface temperature of the insulating material is 100 ° C and the other surfaces 20 ° C. Allowable heat loss up to 140 W / m2 from the wall. If the thermal conductivity of the insulation material is 0.05 W / (m ° C), calculate the required thickness of insulation. insulation thickness = Answer cm
Please show complete solutions and detailed drawings. Show conversions, units, and box in the final answers
1. The thermal resistance of A, B, C, and D are 1, 2, 2, 4 W/ °C, respectively. The total thermal resistance to the wall conductance will be TAs = 200°C a. 9.0 W/ °C b. 5.5 W/ °C C. 6.0 W/ °C d. 16 W/ °C a. 0.672 b. 0.232 C. 0.0672 d. 0.023289 a. 250 W/mK b. 1.25 W/mK 6 cm C. 0.25 W/mK d. 0.125 W/mK A B с 2 cm 2.5 cm 3 cm g. 47.14% h. 14.14% 3 cm 2. The heat transfer due to radiation from a surface of 2 cm² area at 800 °C to a very cold enclosure is 5.0 W. Determine the emissivity of the surface at this temperature D 4 cm Problem 1.34 6 cm 3. An electric wire carrying current is covered with an insulating material. The critical diameter of the insulation is 10 mm. The outside air has heat transfer coefficient of 25 W/m² K TDs = 50°C 4. A hot potato is put in water bowl. Another hot potato of same temperature and size is kept in open air at same temperature that of water. Which potato will cool quicker and why? a. Potato in water bowl, as there will high convection comparatively b.…