Activity: compile 1 example for each topic: explain: 1. Conductive heat flow through flat surface 2. Conductive heat flow throw composite wall 3. Conductive heat flow through thick walled tube
Q: Q3. What is the analogical reason between heat transfer by conduction and flow of electricity…
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Q: heat and mass transfer An uninsulated steam pipe of 100-mm diameter is routed through a building…
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Q: 1. If the thermal conductivity increase the heat transfer coefficient wi
A: Note:- As per our company guidelines we are supposed to answer only one question. Kindly repost…
Q: An one piece window, surface area of 14 m2 and thickness of 5.0 mm, has inner surface temperature of…
A: Answer: The rate of heat conduction through the window is 44.8 kW.
Q: A composite wall is formed of a 2.5-cm copper plate (k = 386 W/m.°C), a 3.2-mm layer of 0.038…
A: Note:As per our guidelines we are supposed to answer only one question. Kindly repost other…
Q: Provide two sample question regarding Heat transfer between two fluids separated by walls of a…
A: To provid two sample question regarding Heat transfer between two fluids separated by walls of a…
Q: The composite wall of an oven consists of three materials, two of which are of known thermal…
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Q: Calculate the natural convection heat transfer coefficient for a vertical stainless pipe, 100 mm…
A: Pipe diameter, d=100mm=0.1m Pipe length, L=0.9m Pipe surface temperature, Ts=145oC The ambient air…
Q: Two identical 7.5-cm cubes of copper at 425 and 90°C are brought into contact. Assuming that the…
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Q: 1.19 A square isothermal chip is of width w = 5 mm on a side and is mounted in a substrate such that…
A: The width of square isothermal chip is, w=5 mm The temperature of the coolant is, T∞=15°C The…
Q: (a) Obtain expressions for the fin heat transfer rates, qso and q,1, in terms of the base…
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Q: Derive an expression for the overall heat transfer coefficient for the following case of a flat…
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Q: Steam at a temperature of 300 °C flows through a steal pipe, k= 14.9 W/m.K of 60 mm inside diameter…
A: Heat flow is the heat supplied for the power generation or for the useful work of a machine. This…
Q: Calculate the heat flow per square meter (heat flux) through mineral wool insulation, U 5 cm thick,…
A: Given data T1=200 °C T2= 30°C Thickness (t)=5cm=0.05m We take thermal conductivity of mineral wool…
Q: In fabrication process, steel components are formed hot and then quenched in water. Consider 2 m…
A: The Biot number can be calculated as, Since the value of the Biot number is more than 0.1, the…
Q: A straight triangular fin of length L and thickness t at the base is made of porous material of…
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Q: A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the…
A: Given data as per question r1=0.18 mr2=0.21 mr3=0.21+0.15=0.36 mT1=2500CKal=204 wmkcalculating the…
Q: A wall is constructed of 2.0 cm of copper, 3.0 mm of asbestos sheet [k = 0.166 W/m.°C], and 6.0 cm…
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Q: wo heat reservoirs with respective temperatures of 325 and 275 K are brought into contact by an iron…
A: Given Thermal conductivity, k = 79.5 W/m K Temperature, T1 = 325 K…
Q: Air flows at 120 o C in a thin-walled tube (k = 18 W/m o C) with h = 65 w/m 2 - o C. The inside…
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Q: Q2: Calculate the critical radius of insulation for asbestos [k = 0.162 W/m K] surrounding a pipe…
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Q: 9. A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine…
A: Given data: Ti=250°CTo=20°Ch=30 W/m2KQ=80 Wr1=0.18 mr2=0.21 mt=0.15 m Need to determine the thermal…
Q: d. Find the heat flow rate, q for each element., If q is given by q =D e. Would you increase…
A: Given…
Q: Suppose that a finned surface is exposed to an environment with a temperature of 32 and a…
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Q: 7. A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed…
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Q: Calculate the heat loss per foot from a 10 in. nominal pipe ( outside diameter = 10.75 in.) covered…
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Q: Calculate the quantity of heat conducted per minute through a duralumin circular disc 127 mm…
A: Given data as per the question Diameter of the disc =127 mm The thickness of the disk = 19 mm…
Q: 4. Calculate the heat loss per linear foot from a 10.3 in. nominal pipe (outside diameter=10.75 in.)…
A: Heat transfer in hollow cylinder: q˙= ∆TR Where ∆T →Temperature difference R → Thermal resistance…
Q: A truncated solid cone is of circular cross section, and its diameter is related to the axial…
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Q: An uninsulated steam pipe of 100-mm diameter is routed through a building whose walls and air are at…
A: GIven:L=1 md=100 mmTa=27°C =300 KTs=147°C =420 Kh=10W/m2Kε=0.8Surafce area,A=πdLA=π*0.1*1 =0.314…
Q: Derive an expression for heat conduction through a composite plane wall of n- layers.
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Q: What is the analogical reason between heat transfer by conduction and flow of electricity through…
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Q: A square silicon chip 7 mm x 7 mm in size and 0.5-mm thick is mounted on a plastic substrate as…
A: Heat Transfer: The transfer of heat from one body to another body due to the difference in…
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Q: T2 D Insulated Consider the composite of two materials combined in parallel paths with the ends…
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Q: PROBLEM 1 Consider an adult human standing in the centre of a closed room. The air and room’s…
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Q: An ice-skating rink is located in an indoor shopping mall with an environmental air temperature of…
A: Note: Dear Student! As per our guidelines, we are only allowed to answer a single question. Kindly…
Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
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Q: Q. A house wall may be approximated as two 1.2 cm layers of fiber insulating board, an 8.0 cm layer…
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Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
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Q: Calculate the heat flow per square meter (heat flux) through water medium with thermal conductivity…
A: If heat transfer is within same medium then this process is conduction whether it is fluid or steel…
Q: of thickness L = 0.1 m and of thermal conductivity k = 1 W/mK has the temperature distribution as…
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Q: Two identical 7.5-cm cubes of copper at 425 and 90°C are brought into contact. Assuming that the…
A: Given…
Q: Two heat reservoirs with respective temperatures of 325 K and 275 K are brought into contact by an…
A:
Q: [Radial system conduction with heat generation] The cross section of a long cylindrical fuel element…
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Activity: compile 1 example for each topic:
explain:
1. Conductive heat flow through flat surface
2. Conductive heat flow throw composite wall
3. Conductive heat flow through thick walled tube
4. CONDUCTED HEAT FLOW THROUGH THICK SPHERE
5. Heat transfer between two fluids separated by walls of a composite
tube of solid materials
6. Absorption, reflection and transmission
Step by step
Solved in 2 steps
- 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.A window measures 36 inches x 50 inches and there are 20 of these windows in a structure. The U-factor for this single pane metal window is 1.3 Btu/hr-ft2-oF. U-factor is the conduction factor (and thus the reciprocal of an R-factor) and is equal to conductivity of the material k over the conducting pathlength L. Assume conduction only. a. Estimate the heat transfer (in Joules per day) through these 20 windows when the inside temperature is 20C and the outdoor temperature stays at -15C. b. The U-factor of replacement windows (double pane, argon filled, low-E vinyl frames) is 0.31 Btu/hr-ft2-oF. How much heat is transferred in a day for this case?V:01 Expert Q&A Done Question 1: In your own words, write down the differences between thermodynamic and heat transfer. (3 Marks) Question 2: Estimate the heat loss per square metre of surface through a brick wall 0.5 m thick when the inner surface is at 400 K and the outside surface is at 300 K. The thermal conductivity of the brick may be taken as 0.7 W/mK. (2 Marks) Question 3: A furnace is constructed with 0.20 m of firebrick, 0.10 m of insulating brick, and 0.20 m of building brick. The inside temperature is 1200 K and the outside temperature is 330 K. If the thermal conductivities are as shown in the figure below, estimate the heat loss per unit area. (5 Marks) 1200 K 330 K Insulating brick X-0.10m k= 0.21 Ordinary brick X=0.20 m Fire brick X= 0.20 m k= 1.4 k= 0.7 (W/mK)
- Task 02 Water flows through a cast steel pipe ( k = 50 W/m.K ) with an outer diameter of 104 mm and 2 mm wall thickness. (i). Calculate the heat loss by convection and conduction per metre length of un insulated pipe when the water temperature is 15 0C , the outside air temperature is -10 0C , the water side heat transfer coefficient is 30 kW/m2.K and the outside heat transfer coefficient is 20 W/m2.K . (ii). Calculate the corresponding heat loss when the pipe is lagged with insulation having an outer diameter of 365 mm, and thermal conductivity of k= 0.05 W/m.KPlease provide accurate answer with proper steps The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of the wall material is 0.1 W/m K and the insulation material is 0.01 W/m K. The furnace operates at 650 0C and the ambient temperature is 30 0 Allowable temperature on the outer side of the insulation is 1000C. Determine the overall heat transfer by conduction per unit area occurring across a furnace wall made from clay. If the air side heat transfer coefficient is 0.4 W/m2 K, calculate the minimum insulation thickness requirement.Shape Factor Conduction Problem A cylindrical pipeline that is used for the transport of crude oil is buried in the soil horizontally such that its centerline is 1.5 m (z) below the surface. The pipe has the outer diameter of 0.5 m (D) and is coated with a 100 mm thick layer of glass insulation on the outside. Assume that heated oil at 120 °C flows through the pipe and the soil surface temperature is at 0 °C (T2). The soil thermal conductivity is known as 0.5 W/m-K, and the glass insulation thermal conductivity is known as 0.07 W/m-K. What is the rate of heat loss per unit length of the pipe (W/m)? Soil Glass insulation Oil, T
- 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 Work1 example each Conductive heat flow through flat surface Conductive heat flow throw composite wallQuestion six(Heat Transfer) In a heat transfer equipment in a laboratory you used a pipe of outside diameter 9cm to convey steam to reduce the heat outward flow from it to the surroundings. You decided to pad the pipe with two layers of insulating materials each 3cm thick. One from the inside, and the other from the outside. the conductivity of one material being 4times that of the other. I. Show quantitavely that the combined conductivity of the two layers is 28% more when the better thermal insulating material is put on the inside. II. What percentage would the combined conductivity of the two layers be if the better insulating material is now placed on the inside.
- 1.) Compare the different heat flux resulting from conduction through 1 in. of the following materials when subjected to a 30oF temperature difference: copper, steel, wood, glass fiber.4 ) Every temperature measuring instrument makes use of specific physical property in order to measure temperature objectively . Which physical properties are used in thermocouple , PT sensors and mercury - in - glass thermometer ? Briefly describe each of this methods.For your company you need to mass produce 20-cmx10-cm heat sinks to dissipate heat quickly from an equipment. After considering several other parameters, you have short-listed two possible designs: A. 72 straight pin fins made of an alloy (thermal conductivity 240 W/m-°C) that costs $9,000 per m³. Each pin is 4 cm long and 1-cm diameter. E.=3'18; $204 B. 64 straight rectangular fins made of another alloy (thermal conductivity 180 W/m.°C) that costs $12,000 per m³. Each pin is 4 cm long and has 2-cmx1-cm cross-section. Eo =7:94%$ 6·14 The convection coefficient of the operating condition is approximated as 15 W/m2.°c. Consider that the manufacturing cost is same for both designs but the material cost differs. Calculate and compare the cost and performance (in terms of heat transfer gains by the heat sinks) of the two heat sinks so that a decision can be made to select a design.