Design thickness of the wall to maintain steady heat flux
Q: A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2…
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Q: HEAT TRANSFER SHOW SOLUTION 4. Consider a solid cylindrical rod of length 0.15m and diameter…
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Q: Node at a plane surface with uniform heat flux m, n+ 1 Ay m - 1. n m.n-1 - Ax
A: Please find the solution below
Q: Explain if the heat transfer in the situation can be simplified to steady heat transfer or…
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Q: The wall of a refrigerator is made of fiberglass insulation (k = 0.035 W/mK) glued between two 1 mm…
A: Given data: Troom=24°CTs,out=20°Ch=9 W/m2K Need to determine the minimum thickness of fiberglass…
Q: A wall is 6.1 m wide 2.4 m hight and has an overall heat transfer coefficient of 0.4 W/m? °C. It…
A: Given data: - The width of the wall is bw = 6.1 m. The height of the wall is hw = 2.4 m. The…
Q: Calculate the heat loss rate with: A) The uncoated sphere; B) The sphere covered with an insulating…
A: 1. Diameter of the sphere D = 6 cm ==> radius r = 3 cm 2. Atmospheric Temperature T∞= 25 °C 3.…
Q: insulator has a thermal conductivity of 20 W/m ºC s used to separate two heat sinks whose…
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Q: Fin increase the heat transfer rates by increasing ………………………….
A: Fin increase the heat transfer rates by increasing …………………………. answer the surfce area of the body
Q: The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k= 240 W/m·K) or copper…
A: Given:Heat transfer from the stove to the pan, Q=1200 WDiameter of pan, d=200 mm or 0.2 mthermal…
Q: (example question from slides) A heat pump is to be used to heat a building during the winter. The…
A: Given:TH=21°C =294 KTL=-5°C =268 KQH=135,000 KJ/h
Q: HEAT TRANSFER SHOW SOLUTION 3. Consider a solid cylindrical rod of length 0.15m and diameter 0.05m.…
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Q: Copper plate (k=270 w/m k) maintained at 70C in one side and another side at 30 C what is the heat…
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Q: In a cylindrical nuclear reactor fuel rod, heat is generated internally according to the equation:…
A: Given data: Rod radius, R=0.0125 mThermal conductivity, k=26 WmKHeat transfer from the surface,…
Q: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The…
A: Heat transfer is given by Q = U*A*dT = (dT/R ) where R is thermal resistance R = (L/KA) and U is…
Q: 3. A 3 in O.D. aluminum tube (k=133 BTU/h ft°F) has 16 longitudinal fins spaced around its outside…
A: Give data: The outer diameter of the tube, do=3 in. The thermal conductivity of aluminum, k=133…
Q: A long water channel is covered with an aluminum cover 8 mm thick and 240 mm wide. The water flowing…
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Q: Straight, rectangular cross-section fins made of metal with constant thermal conductivity k = 235…
A: (a) Fin efficiency, ηfin = 80.57%. (b) Heat transfer rate from fin, qfin = 444.83 W.
Q: A single-cylinder air-cooled lawn mower engine operates under steady conditions. The cylinder…
A: Given, Surface temperature, Ts=300°CAmbient temperature, T∞=30°CThickness of fin,…
Q: Energy management and Audit question A steam main 150mm outside diameter containing wet steam at 28…
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Q: One side of a copper (401 W/m-oC) block 5 cm thick is maintained at 175 oC, the other side is…
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Q: A plane wall of thickness 2L has an internal heat generation that varies according to q = q0 cos…
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Q: In the example case of radiator, to enhance heat transfer from hot water to air, the effective…
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Q: 32. A bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation…
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Q: Calculate the overall heat transfer coefficient for the following cases: (a) Heat is transferred…
A: a). Given- Area, A=1m2Thickness of plate,t=3cm=0.03mThermal conductivity of steel,Ks=36.4W/mKHeat…
Q: In a way to cool an electronic circuit element The supplied aluminum wings are used. Base…
A: Given Data, L = Length of a aluminum wing = 40 mm = 0.04 m t = Thickness of a aluminum wing = 1 mm =…
Q: e steel. The overall heat-transfer coefficient, considering convection on both sides of the plastic,…
A: given:k=16W/mcthickness t=4mmoverall heat transfer U=120W/m2ctemperature difference across the…
Q: thickness (in meter) of the wall to maintain a steady heat flux of 2500 W/m2 should be
A: Given data;
Q: Obtain a relation for the fin efficiency for a fin of constant cross-sectional area Ac, perimeter p,…
A: Given Data The cross-sectional area of the fin, Ac The perimeter of the fin, p The length of the…
Q: An electric motor is to be connected by a horizontal steel shaft (k - 42.56 W/m.K), 25 mm in…
A: Given: k=42.56W/mkT0=540°CT∞=27°CTL=52°Ch=40.7W/m2Kd=0.025m Solution: Since the diameter of the fin…
Q: A plane wall has a thermal conductivity of 1.15 W/mK. If the inner surface is at 1100°C and the…
A: As per given question Thermal conductivity =1.15 w/mk Inner surfaces temp. =1100°c Outer temp.=350
Q: Determine the rate of heat transfer and the overall heat transfer coefficient for the composite wall…
A: Given Data The initial temperature is:T∞1=100°C The initial heat transfer coefficient is:h1=6…
Q: wall having a thermal conductivity of vity 0.9 W/mK. If the heat rate is to b
A: given:thermal conductivity of composite structural k=0.3W/mKthickness t=100mmhermal conductivity of…
Q: e heat transfer coefficient remains constant ne of the above e heat transfer coefficient will…
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Q: O heat source 1나0°C Given: composite wall (3 layers) poy unethane board Corerete rock wool (15 cm,…
A: given data- rate of heat transfer = 507.415 W/m2 concrete temperature = 32 degree C tconcrete= 15 cm…
Q: A bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation rate…
A: Given data: d=0.373 inq'''=10000kW/ft3=34121420 Btu/hrPwater=2250 psiaT∞=575 FTs=675 F To find: Heat…
Q: Q3. A small electric heating application uses wire of 2 mm diameter with 0.8 mm thick insulation (k…
A: Given, r1=1 mmr2=1.8 mmk=0.15 W/m°Ch∘=31 W/m2°C
Q: Q3. A small electric heating application uses wire of 2 mm diameter with 0.8 mm thick insulation (k…
A: Given Data Diameter of wire, d=2 mm Insulation thickness, t=0.8 mm K=0.15 W/mC h0=31 W/m2C Outer…
Q: Rich cows’ milk (4536 kg/h) at 4.4°C is being heated in a heat exchanger to 54.4°C by hot water. How…
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Q: The heat transmission rate through a plate is Ptrans. If the plate thickness is multiplied by two,…
A: The principle of thermal science expresses the rate of heat transmission through a solid called…
Q: U.2 W(III. K) IS auutu to 0.UZ II dlalIcter pipe. TIHE ZAJMIsulating Iaterial wiuI K heat transfer…
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Q: The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper…
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Q: 3- Compare the value between the the actual heat transfer rate Qactual for the surface with fins and…
A: “Since you have asked multiple question, we will solve the first question for you. If you want any…
Q: A room window measure (3 m²) constructed of glass with overall heat transfer coefficient of (4 W/m?.…
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Q: The 10-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m-K) or copper…
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Q: A heavy-water-cooled research reáctor is fueled with natural- Im metal rods 0.9 in. in diameter clad…
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- Show that the rate of heat conduction per unit length through a long, hollow cylinder of inner radius ri and outer radius ro, made of a material whose thermal conductivity varies linearly with temperature, is given by qkL=TiTo(rori)/kmA where Ti = temperature at the inner surface To = temperature at the outer surface A=2(rori)/ln(ro/ri)km=ko[1+k(Ti+To)/2]L=lenthofcyclinder1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.The heat transfer coefficient between a surface and a liquid is 57 W/(m2K). How many watts per square meter will be transferred in this system if the temperature difference is 10C?
- As a designer working for a major electric appliance manufacturer, you are required to estimate the amount of fiberglass insulation packing (k = 0.035 W/m K) that is needed for a kitchen oven shown in the figure below. The fiberglass layer is to be sandwiched between a 2-mm-thick aluminum cladding plate on the outside and a 5-mm-thick stainless steel plate on the inside that forms the core of the oven. The insulation thickness is such that the outside cladding temperature does not exceed 40C when the temperature at the inside surface of the oven is 300C. Also, the air temperature in the kitchen varies from 15Cto33C, and the average heat transfer coefficient between the outer surface of the oven and air is estimated to be 12.0W/m2K. Determine the thickness of the fiberglass insulation that is required for these conditions. What would be the outer surface temperature when the inside surface of the oven is at 475C?A high-speed computer is located in a temperature-controlled room at 26C. When the machine is operating, its internal heat generation rate is estimated to be 800 W. The external surface temperature of the computer is to be maintained below 85C. The heat transfer coefficient for the surface of the computer is estimated to be 10W/m2K. What surface area would be necessary to assure safe operation of this machine? Comment on ways to reduce this area.A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.
- A plane wall 15 cm thick has a thermal conductivity given by the relation k=2.0+0.0005T[W/mK] where T is in kelvin. If one surface of this wall is maintained at 150C and the other at 50C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.GChoose the right answer 1. The temperature profile for steady hest conduction through a plane wall of constant thermal conductivity is a. logarithmic b. parabolic 2. A brick wall (k-0.75 W/mK ) transmits $02 of heat loss through another wall (k-0.25 W/mK, x-100 mm). If the temperature difference across both walls is the same, the thickness of the brick wall would be a.150 mm c. linear 6T b. 240 mm c. 300 mm d. 375 mm 3. The maximum temperature at the center of the solid sphere of radius R having heat generation q (W/m') is given by g'R +9R b. T, + 4k T+9R 6k d. T+9R 8k a. 2k C. 4. The internal thermal resistance of a solid can be ignored if the Biot number is less than a. 1 b. 0.5 c. 0.1 d. Fourier number 5. The ratio of heat transfer of a fin to the heat transfer without fin is referred to as a. fin resistance b. fin efficieney efin effectiveness d. fin conductance.A rectangular wall of length "L" m and height "H" m is made from a thick bricklayer. The rectangular wall has a surface area as 11 m2 & Thermal conductivity as 0.53 W/mK. The wall is subjected to heat transfer due to the outside temperature 43 °C and inside temperature 24 °C. If the energy loss is 11219 kJ in 484 minutes. (HINT: 1 minute = 60 %3D seconds) Determine the following -- i) Heat transfer rate, ii) Thickness of the wall.
- The heat transfer across a 5" wall of firebrick is 500 W/m2. If the surface temperature thermalconductivity of brick is 0.7 Btu/hr-ft-°F, find he on cold side is 30°C and temperature on hot side. O 65.37 deg C 87.25 deg C 73.45 deg C 82.41 deg C5- Determine the rate of heat transfer by conduction per unit area, by means of conduction for a furnace wall made of fire clay. Furnace wall thickness is 6" or half a foot. Thermal conductivity of the furnace wall clay is 0.3 W/m-K. The furnace wall temperature can be taken to be same as furnace operating temperature which is 650°C and temperature of the outer wall of the furnace is 150°C.a. The wall of a building has a surface area of 50 m2. The outside layer of the wall is 20 cm thick concrete with thermal conductivity kcon = .8 W/m-K. The inner layer is 10 cm thick balsa wood (kbalsa = .048 W/m-K) as an insulator. Outside temperatures of 47o C are expected, while an inside temperature of 21o C is maintained by the cooling system. Find the rate of heat transfer through the wall.