Define each term of its thermal conductivity in W/mK
Q: If the area, thickness and temperatures are same across the material. Justify which material will…
A: Thermal conductivity: It is the rate of heat that can be transferred through a unit…
Q: The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -15 C and…
A: Solution:
Q: Determine the thermal conductivity.
A: M1 => K = 15Q42.3-32.8=15Q9.5 M2 => K = 25Q41.9-32.7=25Q9.2 M3 => K = 35Q39-32.7=35Q6.3 M4…
Q: a hot fluid of 200 °C. How long does it take the rod temperature to reach 70% of the fluid…
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Q: Consider a multi-layered walls of a storage building (no windows) that is made of three layers as…
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Q: The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -15 C and…
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Q: If we consider a flat sheet of iron at 300 K does not receive any radiation from its surroundings.…
A: Given data:- The temperature of the iron sheet is T = 300 K. The length and width of the iron sheet…
Q: What is meant by the term one-dimensional when applied to conduction
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Q: Thermal diffusivity of a substance is a. Inversely proportional to thermal conductivity b. Directly…
A: Thermal diffusivity of a substance is
Q: method of measuring the Thermal Conductivity of an explanatory material,
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Q: has an area of 5.5 ft² of 5 mm. If one side is at a temperature of 45° F and the other is at 23° F,…
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Q: Calculate the heat transfer per hour through a solid brick wall
A: Given data; a solid brick wall ;length (L)=6 mheight (h)=2.9 mthick =225mm=0.225…
Q: The following unit conversions are illustrations of the SI system of units. Convert: a. A thermal…
A: Given data as per question A thermal conductivity value of 0.3 BTU/h ft oF) to W/m-Kb. A surface…
Q: 1 Derive the Value of thermal resistance in aCylindrical wall
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Q: A wall is made up of an outer layer of brick, 79 mm (k = 0.65 W/m°C) followed by 41 mm layer of…
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Q: Choose the correct answer for heat: Select one: O a. Path Function O b. Intensive properties O c.…
A: Extensive properties: It properties which is depend on the amount of matter. Intensive property: It…
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Q: Define the thermal conductivities of some materials at room conditions
A: Thermal conductivity is a kind of intrinsic property of a substance that determines the ease with…
Q: A window measures 36 inches x 50 inches and there are 20 of these windows in a structure. The…
A: Given: Window of size 36 inches x 50 inches A=1800 in2=1.161 m2 Number of windows, n=20 U=1.3…
Q: A temperature difference of 85•C is impressed across a fiberglass layer of 13 cm thickness. The…
A: Temperature difference across a fibreglass, ∆T=85oC Thickness of the fibreglass, L=13cm=0.13 m…
Q: Experiment :LEE'S DISC Aim: To determine the thermal conductivity of a bad conductor by the Lee's…
A: Concept used: Heat flows from higher to lower temperature.
Q: Question 9 the dimensions of the faces of each block be 3 m by 2 m. Also, the conductivity of copper…
A: We are authorized to answer one question at a time since you have not mentioned which question you…
Q: (HEAT TRANSFER THROUGH COMPOSITE WALLS)
A: Given:
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A: Heat transfer, in general, defines the movement of heat (thermal energy) caused by temperature…
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Q: e thermal radiation in nanofluid
A: INTRODUCTION:Themal radiation is electromagnetic radiation created by the thermal movement of…
Q: One end of a 40 cm metal rod 2.0 cm2 in cross section is in a steam bath while the other end is…
A: Given, Length of metal rod, L=40cm Area of the rod, A = 2cm2 Mass of ice melted, m=13.3g Time taken…
Q: The compartment below is used as a freezer of refrigerator compartment. Inner wall is at -8 C and…
A: Option C is correct K=0.097 w/mk
Q: 6. The surface of a furnace wall is at a temperature of 1200°C. The outside wall temperature is…
A: Given, Ti=1200 0CTo=38 0C L1=15 cm=0.15 mL3=1 cm=0.01 m k1=1.73 W/m.Kk2=0.34 W/m.Kk3=44 W/m.K The…
Q: The internal and external surfaces of a brick wall, 5m x 6m, 30 cm thick and with a thermal…
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Q: I- Rate of heat transfer per unit area (Im) through the composite wall. Il- Determine also the…
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Q: Determine the specific heat of a 150.0 gram object that requires 62.0 cal of energy to raise its…
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Q: 12.3-2. Determination of Thermal Conductivity. In determining the thermal conductivity msu of an…
A: Given:
Q: Why is the thermal conductivity of superinsulation orders of magnitude lower than the thermal…
A: (1) Superinsulation: Superinsulation is made by a number of layers of highly reflective sheets and…
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Q: A furnace wall consists of 2 ft of brick . The brick has a thermal conductivity of 0.6 Btu/ hr sq…
A: (a) The thermal diffusivity of the brick is α = 0.0273 ft2/hr. (b) The heat loss per hour through a…
Q: 1. Thermal conductivity of clothes: How should the material of underwear and outerwear be selected…
A: Introduction: Thermal conductivity is extremely significant to clothing makers since the comfort…
Q: dT = k(T- Tm), where T(t) is the temperature of the object at The mathematical model for Newton's…
A: Given Data dTdt=K(T-Tm)by solving above equation we will get-kt=log(T-Tm)+log C T-Tm=C×e-kt→ →…
Q: hermal conductivity of the layers and temperatures are shown conduction, answer the following…
A: ka=2W/m°Ckb=1W/m°Ckc=5W/m°Ckd=4W/m°CLet T1, T2, T3, T4 be the temperatures at the start of section…
Q: A glass window pane and a pyrex window pane are held together as shown below. Heat is flowing…
A: Note: As per policy, we can solve the first one from multiple questions. Please resubmit the…
Q: Calculate the energy transfer rate, in SI unit, across 6 in. wall of fire brick with a temperature…
A: Below is the answer to the question mentioned.
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- 1.3 A furnace wall is to be constructed of brick having standard dimensions of Two kinds of material are available. One has a maximum usable temperature of 1040°C and a thermal conductivity of 1.7 W/(m K), and the other has a maximum temperature limit of 870°C and a thermal conductivity of 0.85 W/(m K). The bricks have the same cost and are laid in any manner, but we wish to design the most economical wall for a furnace with a temperature of 1040°C on the hot side and 200°C on the cold side. If the maximum amount of heat transfer permissible is 950 , determine the most economical arrangement using the available bricks.1.63 Liquid oxygen (LOX) for the space shuttle is stored at 90 K prior to launch in a spherical container 4 m in diameter. To reduce the loss of oxygen, the sphere is insulated with superinsulation developed at the U.S. National Institute of Standards and Technology's Cryogenic Division; the superinsulation has an effective thermal conductivity of 0.00012 W/m K. If the outside temperature is on the average and the LOX has a heat of vaporization of 213 J/g, calculate the thickness of insulation required to keep the LOX evaporation rate below 200 g/h.Thermal conductivity for pure aluminum: kal = 238 W/m⋅K ; Thermal conductivity for glass: kgl = 1.4 W/m⋅K.
- Required info: There is a 2.00 cm thick stagnant air pocket. a) What thickness of cork would have the same R-factor as the stagnant air pocket? The thermal conductivity of air is 0.0230 W/m-K and of cork is 0.0460 W/m-K. b) What thickness of tin would be required for the same R-factor as a 2.00-cm-thick stagnant air pocket? The thermal conductivity of air is 0.0230 W/m:K and of tin is 66.8 W/m-K. THANK UA new 1 ft thick insulating material was recently tested for heat resistant properties. The data recorded temperatures of 70 deg. F and 210 deg. F on the cold and hot sides, respectively. If the thermal conductivity of the insulating material is 0.026 Btu/ft . h .⁰ F, calculate the rate of the heat flux,Q/A, through the wall in Btu/ft^2 . h. Resolve the problem in SI units.(a) What will be the convection heat transfer coefficient for a similar bar with L = 1 m when V =15 m/s?(b) What will be the convection heat transfer coefficient for a similar bar with L = 1 m when V =30 m/s?(c) Would your results be the same if the side of the bar, rather than the diagonal, were used asthe characteristic length?
- A small sphere (emissivity = 0.745, radius = r1) is located at the center of a spherical asbestos shell (thickness = 1.72 cm, outer radius = r2; thermal conductivity of asbestos is 0.090 J/(s m Co)). The thickness of the shell is small compared to the inner and outer radii of the shell. The temperature of the small sphere is 727 °C, while the temperature of the inner surface of the shell is 406 °C, both temperatures remaining constant. Assuming that r2/r1 = 6.54 and ignoring any air inside the shell, find the temperature in degrees Celsius of the outer surface of the shell.A gas vessel 1.5m x 1.5m x 2m containing Carbon Dioxide (CO2) with a temperature of -3°C. The right vessel wall is fixed to the wall, as shown in Figure Q1 (a). A minimum force of 10kN is required to split/open the gas vessel. Calculate: i. Vacuum pressure of CO2.ii. Mass of the CO2. Take molecular weight for Oxygen= 16, Carbon = 12, atmosphericpressure 100kPa, and universal gas constant = 8314 J⋅kmol−1⋅K−1A 1 in. o.d. (outer diameter) tube reactor is insulated with a 3 inch layer of asbestos. If the temperature of the outer surface of the insulation is 100 °F and the rate of heat loss per foot of reactor length is 50 BTU/hr, what must the temperature of the inside of the reactor be? [for asbestos, k = 0.105 BTU/hr ft °F]
- 3.A steam at 118°C is flowing inside a diameter of 40 mm, thickness of 10 mm ceramic pipe (k=1.52 W/mK). The pipe is insulated with 25 mm of insulator (k=0.064 W/m K). The convective coefficient for steam inside the pipe is h;=20.7 W/m²K and the convective coefficient for air outside the pipe is h.=0.07W/m²K. The air is at a temperature of 28°C ? (1)Calculate the heat loss per unit length of 1m of pipe (W)? (2)Repeat, using the overall U; based on the inside area A; ?A low carbon steel pipe with an internal diameter of 52.5 mm and a thickness of 3.8 mm that carries dry saturated steam at 20 bar is insulated with an insulator made of diatomaceous earth with a thickness of 30 mm and whose thermal conductivity is 0.1 W / (m ° C). This in turn is covered with a 65 mm thick layer of asbestos with k = 0.073 W / (m ° C). In one test the ambient temperature was 20 ° C and the asbestos surface temperature was 40 ° C. The heat transfer coefficient in the inner part of the tube was estimated as hi = 55 W / (m2 ° C). Neglect radiation losses. a) What is the heat loss per meter of pipe, in W / m? 1) 61 2) 84 3) 142 4) 5755. A 10-in nominal pipe (outside diameter = 10.75in) is covered with a composite pipe insulation consisting of 2.0 in of insulation I placed next to the pipe and 1.5 in of insulation II placed upon insulation I. Assume that the inner and outer surface temperatures of the composite insulation are 900F and 150F respectively, and that the thermal conductivity of material I is 0.05 BTU/hr-ft-F and for material II is 0.039 BTU/hr-ft-F. What is the individual thermal resistance of insulation I?