A 12 cm diameter steam pipe is covered by 2 layers of lagging. The inside layer is 3 cm thick and has a coefficient of thermal conductivity of 0.08 W/m-K. The outside layer is 4 cm thick and has a coefficient of thermal conductivity of 0.15 W/m-K. The steam main conveys steam a pressure of 1.7 MPa with 25 °C superheat. The outside temperature of the lagging is 27 °C. If the steam main is 35 m long, find the heat loss in kW.
Q: OA l-m long hollow cylinder of inner radius 5 cm and outer radius 15 cm is considered. The inner…
A: Given data: The length of the cylinder, L = 1 m. The inner radius of the cylinder, ri = 5 cm. The…
Q: Steam at T∞ 1 = 320°C flows in a cast iron pipe (k = 80 W/m · °C) whose inner and outer diameters…
A:
Q: A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at…
A:
Q: A heater tube with power 2000 W is placed inside a fluid. Assuming all of the electrical power is…
A: from the given data, by heat balance h× Area×(Tfluid - Tambient) = 2000. here, Area = pi×d×l =…
Q: 2. Two 4-m-long and 0.4-cm-thick cast iron (k = 52 W/m·K) steam pipes of outer diameter 10 cm are…
A: givenDi=9.2cm =0.092mDO=10cm =0.10mso Ai=πDJL =π×0.092×8 =2.312m2A0=πDOL =π×0.1×8 = 2.513m2
Q: A 12-cm outside diameter and 10-cm inside diameter cast iron pipe with conductivity of 80 W/m-K has…
A:
Q: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The…
A: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface, U…
Q: In a thermal power plant, a horizontal copper pipe of "D" diameter, "L" length and thickness 0.6 cm…
A:
Q: Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the…
A: Given Data The Convective heat transfer coefficient, h= 15 W/(m*K) The surface area of the fin, A= 2…
Q: H.W. Q: An aluminum pan whose thermal conductivity is 237 W/m-°C has a flat bottom with diameter 20…
A: Heat transfer by conduction is given by Fourier's law Q=-kAlA dTdx the temperature gradient decrease…
Q: Two industrial steel pipes are carrying 200 °C steam. The internal diameter of both pipes are 2.0 cm…
A:
Q: Steam at 230°C is flowing through a steel pipe (k = 15.1 W/m-K) whose inner and outer diameters are…
A:
Q: A pipe carrying steam of 5 cm inside diameter and 6.5 cm outside diameter is covered with a 2.75 cm…
A:
Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…
A:
Q: A 50 meter long cast iron pipe with outer diameter of 10 cm passes in an open space of 288 K…
A: Given, L = 50 m d2 = 10 cm = 0.1 m To = 288 K Ti = 423 K Combined heat transfer Coefficient (h) =…
Q: Q.6 A 1 cm diameter, 30 cm long fin made of aluminum (k = 237 W/m°C) is attached to a surface at…
A: Given:d=1 cml=30 cmk=237 W/m°CTb=80°CT∞=22°Ch=11 W/m2°C
Q: The walls of the refrigerated storage room are 10 m long and 3 m high and constructed with 90 mm…
A: Given: The thermal conductivity of concrete block is kc=0.935 W/m°C=0.935 W/mK, The thermal…
Q: A refrigerator door of area 0.6 sq.m consists of 25 mm of insulation on top of a thin metal sheet.…
A: Qtotal=Qconduction+(Qconvection)in+(Qconvection)outQtotal=∆T1hAin+tkAcond+1hAoutQtotal=20-0110×0.6+0…
Q: One side of a copper (401 W/m-oC) block 5 cm thick is maintained at 175 oC, the other side is…
A:
Q: Consider a stainless steel spoon (k = 15 W/m·K) partially immersed in boiling water at 95°C in a…
A:
Q: A refrigerator door of area 0.6 sq.m consists of 25 mm of insulation on top of a thin metal sheet.…
A: given; →area(A)=0.6m2→insulation thickness(t)=25mm=0.025m→inside heat transfer coefficent…
Q: Two industrial steel pipes are carrying 200 °C steam. The internal diameter of both pipes are 2.0 cm…
A: First option is correct.
Q: A 3-m long and 0.4-cm-thick cast iron (k= 52 W/m ·°C) steam pipes of outer diameter 10 cm are…
A: Given data
Q: 7-28 A transformer that is 10-cm long, 6.2-cm wide, and 5-cm high is to be cooled by attaching a…
A:
Q: Convective heat transfer coefficient is 15 W/(m*K), surface area of the fin is 2 m^2, the…
A: Given :- Area of fin, A= 2m2 Base temperature, Tb = 70°C = 343K Ambient temperature, To = 20°C =…
Q: Steam passes into tubes in a heating system whose outer diameter is 3 cm and whose wall is held at a…
A: Given Data: The outer diameter of the tube is, D1=3 cm=3 cm×m100 cm=0.03 m. The temperature of the…
Q: shape of a cylindrical tube with a length of 35.0 m and an inner radius of 2.50 m. Its walls are…
A:
Q: Consider a steam pipe of length 15 ft, inner radius 2 in., outer radius 2.4 in., and thermal…
A:
Q: When a long section of a compressed air line passes through the outdoors, it is observed that the…
A:
Q: A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10…
A:
Q: Estimate the natural convection heat transfer coefficient of the horizontal pipe. The temperature of…
A: Given: Outer surface temperature of pipe Ts=120oC The ambient air temperature, T∞=40oC Outer pipe…
Q: Calculate the overall heat transfer coefficient of the steel pipe based on the inner surface. The…
A: Given: Inner diameter of pipe is 12.7 cm. Thickness of the pipe is 2.4 cm. Inside Convection heat…
Q: Determine the rate of heat transfer and the overall heat transfer coefficient for the composite wall…
A:
Q: Hot water at an average temperature of 70°C is flowing over a 15-m section of a cast iron pipe (k =…
A: Given: Hot water temperature is 70°C. Length of pipe is 15 m. Thermal conductivity of CI pipe is 52…
Q: Steam at 200ºC flows in a cast iron pipe (k = 80 W/m⋅ºC) whose inner and outer diameters are D1 =…
A:
Q: The walls of the refrigerated storage room are 10 m long and 3 m high and constructed with 90 mm…
A: Given: The length of the wall of the refrigerated storage room is L=10 m, The height of the wall of…
Q: 8.) A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space…
A: Given data, Length of the steam pipe, L = 50 m Outer diameter of the steam pipe, D2 = 0.1 m Outer…
Q: H.W. Q:A hot surface at 100°C is to be cooled by attach- ing 3-cm-long, 0.25-cm-diameter aluminum…
A: Given data:
Q: Steam passes into tubes in a heating system whose outer diameter is 3 cm and whose wall is held at a…
A:
Q: Two industrial steel pipes are carrying 200 °C steam. The internal diameter of both pipes are 2.0 cm…
A:
Q: An aluminum pan whose thermal conductivity is 237 W/m*^ C has a flat bottom whose diameter is 20 cm…
A: Given-Data:- Thermal Conductivity=237Wm°CThickness of aluminium pan(L)=0.6cmDiameter of Aluminium…
Q: In the walls of a warehouse, the inner plaster thickness is 2 cm and the heat conduction coefficient…
A: Given data: For the walls of a warehouse: Inner plaster thickness, xip=2 cm=0.02 m, and it's thermal…
Q: 18. An aluminum pan whose thermal conductivity is 237 W/m · °C has a flat bottom whose diameter is…
A: The problem is based on heat transfer and can be solved as:
Q: Q1: An aluminum pan whose thermal conductivity is 237 W/m-°C has a flat bottom whose diameter is 20…
A:
Q: A conductor with a diameter D= 0.8 cm, covered by an electric current, passes through an environment…
A: Given:- D=0.8cm=0.008m T0 = 30 °C Ti= 130 °C h= 120 W/(m² °C) l=1m k=1.2 W/(m°C) To find:- Heat loss…
Q: Steam exiting the turbine of a steam power plant at 40°C is to be condensed in a large condenser by…
A:
Q: A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was…
A:
Q: sof? =120°Cand?
A: given:outer radius r2=7cminner radius r1=5cmthermal conductivity k=25W/mKT1=120CT2=50C
Show you complete solution.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
- Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 55A 10-cm diameter pipe is covered by 2 layers of lagging. The insidelayer is 4 cm thick and has a coefficient of thermal conductivity of 0.08W/m-K. The outside layer is 3cm thick and has a coefficient of thermalconductivity of 0.15 W/m-K. The steam main conveys steam apressure of 1.7 MPa with 25 C superheat. The outside temperature ofthe lagging is 27 C. If the steam main is 30 m long, determine theinterface temperature of the lagging and overall coefficient of heattransfer based on outside area.A 10 cm diameter pipe is covered by 2 layer of logging. the inside layer is 4 cm thick and has a coefficient of thermal conductivity of 0.08 w/m-k. the outside layer is 3 cm thick and has coefficient of thermal conductivity of 0.15 w/m-k. the steam main conveys steam a pressure of 1.7 mpa with 25 C superheat. the outside temperature of the lagging is 27 C. if the steam main is 30 m long, determine the interface temperature of the lagging and overall coefficient of heat transfer based on outside area.
- Problem 3: Insulation To=1 Toowwww Steam Tx2 T₂ T3 www www R₁ R₁ R₂ www.T R₂ Steam at Tx1 = 320 °C flows in a cast iron pipe (k = 80 W/m. °C) whose inner and outer diameters are 5 cm = 0.05 m and D₂ = 5.5 cm = 0.055 m, respectively. The pipe is covered with 3-cm-thick glass wool insulation with k = 0.05 W/m. °C. Heat is lost to surroundings at T2 = 5 °C by natural convection and radiation, with a combined heat transfer coefficient of h₂ = 18 W/m². °C. Taking the heat transfer coefficient inside the pipe to be h₁ = 60 W/m². °C, determine the temperature drops across the pipe and the insulation. The determination is based on a unit length of the pipe (L = 1 m). Assumptions 1. Heat transfer is one-dimensional since there is no indication of any change with time. 2. Heat transfer is one-dimensional since there is thermal symmetry about the centreline and no variation in the axial direction. 3. Thermal conductivities are constant. 4. The thermal contact resistant at the interface is…A steam is flowing through a 5.7 m long of steel tube that has inner and outer radii of r, = 0.015 and r, 0,024 m, and a thermal conductivity of 0.14 W/m.K. The steam and the outer surface of the tube is maintained at constant temperature of 150 °C and the air = 25 °C, h = 0.35 W/m2.k) is surrounding the tube. To prevent the outer surface of the steel from the environmental conditions, a material that has a thermal conductivity of 0.014 W/m.k is wrapped over the outer surface of the steel. What is the maximum heat transfer from the steam to the air (W)? NOTE: Enter your answer. Answer Air Th Steam Steel Tr 111 ToSTEAM FLOW IN AN INSULATE PIPE AT ATEMPERATURE 130 C. THE INSIDE HEAT TRANSFER COEFFICIENT IS 79 W/M-K AND THE OUTSIDE COEFFICIENT IS 15 W/M-K. THE PIPE IS MILD STEEEL (K=57 WLM-K) AND HAS AN INSIDE RADIUS OF 50 MM AND AN OUTSIDE RADIUS 57 MM. THE PIPE IS COVERD WITH A 25.4 MM LAYER ( K=0.09 W/M-K). DETERMINE THE OVERALL HEAT TRANSFER COEFFICIENTIF THE SURROUNDING AIR TEMPERATURE IS 21.1 C.
- You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?2. For a saturated dry steam at 1,500 KPa that passes through a 100 mm (OD) steel pipe with a thickness of 5 mm and a length of 100 meters. The steam line is insulated with a 50 mm thickness and a thermal conductivity of 0.25 W/m.C. For a mass flow rate of 600 kg of steam per hour. The surface film conductance of steam is h = 5,500 W/m?.C, surface film conductance of air is h = 12 W/m?.C , thermal conductivity of pipe material is k = 153 W/m.C and the ambient air temperature is -10°C . Determine the following: a) The quality of steam after passing through the pipe b) Explain the concepts/principles that were considered and the factors that affected the condition of the above mentioned items (a & b) @ 1,500 KPa (tsat = 198.32°C) kJ 2,792.20- kg k] 844.89 kg kJ 1,947.30- kg 1 hg 2 hf hfgDry saturated steam at 500 RK flows in a 20-cm I.D., 21 cm O.D. pipe. The pipe is covered with 8 cm of insulation that has a thermal conductivity of 0.10 W/m-K. The pipe's conductivity is 52 W/m-K. The ambient temperature is 300 2K. The unit convective coefficient on the inside is 18,000 W/m2-K. and the outside is 12 W/m2-K. Determine the heat loss from a pipe 4 m long. Calculate the overall coefficient of heat transfer based on the outside area.
- There are 2 different types of fins: circular section and square section. Both fins are 30 cm length and they are made of copper with 380W/mK_conductivity. The circular section fin diameter is D = 3mm and the lateral width of the square section fin is W = 50 mm. The fin base temperature is -10°C. The fins are immersed in an oil bath at 50°C and perpendicular velocity to the axis of the fins. Obtain the maximum heat rate absorbed in each types of fin for an oil velocity of 60 m/s. Justify every calculation and assumption. Answer: 27.42W (circular section); 987.53W (square section parallel oriented); 1018.6W (square section oblique oriented)Question 2 Steam at 320ºC flows in a stainless steel pipe, whose inner and outer diameters are D₁ = 5 cm and Do 5.5 cm. The pipe is insulated with insulating material - glass fiber (organic bonded) at a thickness of 3 cm. Heat is lost to surroundings at 5°C via convection and radiation with a combined heat transfer coefficient of h₂ = 18 W/m²K. If the heat transfer coefficient inside the pipe is h₁ = 60 W/m²K, determine: a) the heat loss from the steam per unit length of pipe b) temperature drop across the pipe thicknessSteaks (2 cm thick, k = 0.45 W/m - °C, « = 0.91 x 107 m2/s) usually have an original temperature of 25 °C. They will be cooled in a refrigeration room. The said room has a temperature of -11 °C. The heat transfer coefficient on both sides of the steak is 9 W/m2 - °C. How long will it take for both surfaces of the meat to be cooled to 2 °C? Assume the geometry of steaks to be a flat slab.