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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

Q1- An exterior wall of a house consists of 10.2 cm brick and 3.8 cm gypsum plaster. What thickness of loosely packed rockwool insulation should be added to reduce the heat transfer through the wall by 80%? Thermal conductivity of materials for the wall are Brick: k= 0.7 W/mK Gypsum plaster: k=0.48 W/mK Rockwool: k= 0.065 W/mK

Determine k, thermal conductivity of a wall if q = 1000 kcal/m2 -hr at thickness, k = 33 mm and ∆t = 30°C.

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A wall consists of a layer of wood and a layer of cork insulation of the same thickness. The temperature inside is 34.0°C, and the temperature outside is 0.0°C. The thermal conductivity of wood is 0.130 W/(m·K) and the thermal conductivity of cork is 0.0460 W/(m·K). A) What is the temperature at the interface between the wood and the cork if the cork is on the inside and the wood on the outside? in C  B) What is the temperature at the interface if the wood is on the inside and the cork is on the outside? in C C) It doesn’t matter whether the cork is placed on the inside or the outside of the wooden wall because the temperature at the interface differs for the two cases.the temperature at the interface differs for the two cases. the temperature at the interface is the same for the two cases.the temperature at the interface is the same for the two cases. the total thermal resistance is the same for the two cases.the total thermal resistance is the same for the two cases.…

-:) Given a tank wall with a thickness of 0.01 m and a thermal conductivity of 0.2 W/m-K. The convective coefficient is 100 and 10 W/m²K for inner and outer surfaces, respectively. An insulation layer with a thermal conductivity of 0.06 W/m-K is used to reduce the heat flux by 90%, If all the parameters are assumed to remain the same, what is the thickness of the insulation layer? (in meter) (a) 0.052 (d) 0.086 (b) 0.012 (e) 0.043 (c) 0.128

Requirements: 1. Fill the tables. 2. Calculate the thermal conductivity and the thermal resistance. Comment on results. 3. Plot the measured values for temperature difference over the electrical power.     please don't reject the question. Thank you

As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 1. Ts. 1} Steam 12. T8.2} Insulation (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T2 = 490 K, respectively. what is the rate of heat loss per unit length (q') of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T2, in K, for the steam pipe with the inner surface temperature fixed at T₁ = 800 K, inner radius r₁ = 0.06 m, and outer radius r₂ = 0.14 m. The outer surface is exposed to an airflow (To = 25°C) that maintains a convection coefficient of h = 25 W/m²-K and to large surroundings for which Tsur = To = 25°C. The surface emissivity of calcium silicate is approximately 0.8.

Q1/ A thick wall consists two layers of Gypsum, insulation and brick as shown in figure below. The ambient temperature is 20 °C and heat transfer coefficient is 5 W/m2. K in the left side. The surface temperature of right side is 45 °C. find the heat losses per meter length. What will happen if the insulation's thickness * .increases by 25% Gypsum k = 0.04W/m. K T = 45 °C h=5 W/m'. K T. = 20 °C 5 cm Insulation k = 0.04W/m. K Brick k = 0.69 W/m. K

To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe ( ks = 40 W/m-K) has an inside diameter of Di, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D2 = 250 mm and wall thickness, = 1,. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, = 0.0425 W/m.K) between the two pipes does not exceed its maximum service temperature of Tp, max = 70°C. The ocean water is at Too, o ho T = -5°C and provides an external convection heat transfer coefficient of h = 500 W/m²K. The convection coefficient associated with the flowing crude oil is h₁ = 450 W/m²K. (2) It is proposed to enhance the performance of…

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Q1/ A thick wall consists two layers of Gypsum, insulation and brick as shown in figure below. The ambient temperature is 20 °C and heat transfer coefficient is 5 Wim2. K in the left side. The surface temperature of right side is 45 °C. find the heat losses per meter length. What will happen if the insulation's thickness * increases by 25% Gypsum k = 0.04W/m. K T= 45 °C h=5 W/m'. K T = 20 °C 5 cm Insulation k=0.04W/m. K Brick k=0.69 W/m. K

As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1, Ts,1} Steam Insulation = 490 K, respectively, (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T,1 what is the rate of heat loss per unit length (q) of the pipe, in W/m? = 800 K and T,2 (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the inner surface temperature fixed at T1 = 800 K, inner radius rį = 0.06 m, and outer radius ry = 0.12 m. The outer surface is exposed to an airflow (T, = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur = T, = 25°C. The surface emissivity of calcium silicate is approximately 0.8. %3D

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A wall made of wood is 4.00 cm thick and has an area of 48.0 m². If the temperature inside is 25 °C and the temperature on the outside is 14 C, then at what rate is thermal energy transported through the wall by conduction? The thermal conductivity of wood is 0.080 Js ¹m¹(c)¹ 'n Muur is gemaak van hout wat 4.00 cm dik is en met 'n oppervlakte van 48.0 m². Wat is die tempo van energie oordrag as gevolg van geleiding deur die muur indien die binne temperatuur is 25 °C en die buite temperatuur 14 °C is? Die termiese geleidingskonstante van hout is 0.080 Jsm¹(C)1. Select one: a 82 W O b. 1056 W 690 W 1100 W O e. 2200 W O.C. O d. A

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Consider a A = 17.0000 m² wall with two layers of insulation: d T = 10 °C between styrofoam and brick layers. Heat flow through d = 11 cm d = 15 cm Outside T = 1°C foam K = 0.01 W/(m Inside A 17.0 m² = 10 °C k=0.8W(mK) system of coordinates What is the heat flow through the wall divided by wall area? W What is the inside temperature? Tin = 9 Your last answer was interpreted as follows: 1 What is the heat flow (power) through the wall? P= W Your last answer was interpreted as follows: 1 What is the amount of heat passed through the wall? °C Your last answer was interpreted as follows: 1 Your last answer was interpreted as follows: 1 15 cm of brick wall and d = 11 cm of styrofoam. Temperature outside is Tout = 1 °C and the wall is measured for t = 12 h Do not leave any fields blank if you don't know the answer insert 1 for example

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

- 20 °C Wood siding Stud 130 mm Insulation Wall board 21 °C 40 mm Figure 1: The top view of the composite wall.

8) Consider two liquids, A and B. with temperatures Te > TA. The two objects are put into thermal contact for a time period. Without just saying 'heat flows from hot to cold' how would you prove to someone that a quantity of heat flowed from B to Á. (think of James Joule's experiments) 9) If the temperature of the sun were to suddenly double, by what multiplicative factor would the thermal radiation change ? Show Work

and heat transfer coefficients. Determine the thermal conductivity of a test panel 150 mm X 150 mm and 12 mm thick. 290 K and 300 K. Describe the different ways of therma! conductivity 1n solids iy nteactios if during a two-hour period 8.4 X 10 J are conducted through the pancl when the two face: are at Teydk İCA 1メーx- 入-入 {x'x +

A pipe 40 cm in diameter contains steam at 100°C and is covered with asbestos (K = 0.0006 cal/cm*deg*sec) 10 cm thick. The outside temperature is kept at 60°C. How much should the thickness be increased in order that the rate of heat loss will be decreased by 25%? (A) 14.34 cm B) 4.34 cm 34.14 cm D) 24.43 cm

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QUESTION-) 236 °C steam flows in a pipe which features are given below. Inner and outer diameters of pipe are 300 mm and 320 mm. Coefficient of heat transmission is 40 W/mK. It's external ambient is air and it's temperature is 20 °C. Take the temperature of the pipe's external surface 180 °C. It is known that the internal temp convection coefficient is 600 W/m^2K and external heat transfer coefficient is 5.9109 W/m^2K The pipe's length is 500 meter. You need to add the radiation in the calculation. The rate of the radiation emissivity is 0.85. You can take the environmental surface temp directly. IMPORTANT NOTE: Hi. I sent this question to be solved 3 times. But I faced with different and wrong answers in all. What i want to ask is that doesn't all the resistances except conduction and convection resistances need to change after adding the insulation materials to the pipe? In the solution the people who solved this question took the external surface temp constant. Shouldn't the…

What will be the rise in temperature in 30 minutes of a block of copper of 500-gram mass if it is joined to a cylindrical copper rod 20 cm long and 3.0 mm in diameter when a temperature difference of 80 degree Celsius is maintained between ends of the rod? The thermal conductivity of copper is 1.02 cal/cm2-sec-°C/cm (neglect heat losses). Please include FBD