Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 2, Problem 2.46P
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of
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In a thermal power plant, a horizontal copper pipe of "D" diameter, "L" length and thickness 1.7 cm enters into the boiler that has the thermal conductivity as 0.3 W/mK. The boiler is maintained at 107degreeC and temperature of the water that flows inside the pipe is at 31degreeC. If the energy transfer (Q) is 124925 kJ in 7 hours. Determine the Heat transfer rate, Surface area of the pipe and Diameter & Length of the pipe, if D = 0.012 L.Change in Temperature (in K)
Heat Transfer Rate (in W)
Surface Area of the Pipe (m2)
Pipe Length (in m)
Pipe Diameter (in mm)
Copper pipe (k = 400 W/m.K) has an inner diameter of 25 cm and an outer diameter of 27 cm. Saturated steam flows through it at 110 °C. The piping is located in a space at 30 °C and the external convection heat transfer coefficient is estimated at 15 W/m2.K, while the internal convection heat transfer coefficient is 2500 W/m2.K. In order to reduce heat losses, it was decided to install thermal insulation. The available insulation has a thickness of 4.9 cm and a conductivity k = 0.027 W/m.K. Calculate the percentage increase in the "total" thermal resistance resulting from installing the insulation (between the uninsulated and the insulated case).
Copper pipe (k = 400 W/m.K) has an inner diameter of 25 cm and an outer diameter of 27 cm. Saturated steam flows through it at 110 °C. The piping is located in a space at 30 °C and the external convection heat transfer coefficient is estimated at 15 W/m2.K, while the internal convection heat transfer coefficient is 2500 W/m2.K. In order to reduce heat losses, it was decided to install thermal insulation. The available insulation has a thickness of 4.9 cm and a conductivity k = 0.027 W/m.K. Calculate the percentage increase in the "total" thermal resistance resulting from installing the insulation (between the uninsulated and the insulated case).
Uma tubulação de cobre (k = 400 W/m.K) tem um diâmetro interno de 25 cm e um diâmetro externo de 27 cm. Vapor saturado flui através dela a 110 °C. A tubulação está localizada em um espaço a 30 °C e o coeficiente de transferência de calor por convecção externo é estimado em 15 W/m2.K, enquanto o coeficiente de transferência de calor por…
Chapter 2 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 2 - A plane wall, 7.5 cm thick, generates heat...Ch. 2 -
2.2 A small dam, which is idealized by a large...Ch. 2 - 2.3 The shield of a nuclear reactor is idealized...Ch. 2 - A plane wall 15 cm thick has a thermal...Ch. 2 - 2.5 Derive an expression for the temperature...Ch. 2 - A plane wall of thickness 2L has internal heat...Ch. 2 - 2.7 A very thin silicon chip is bonded to a 6-mm...Ch. 2 - 2.9 In a large chemical factory, hot gases at 2273...Ch. 2 - 2.14 Calculate the rate of heat loss per foot and...Ch. 2 - 2.15 Suppose that a pipe carrying a hot fluid with...
Ch. 2 - Prob. 2.16PCh. 2 - Estimate the rate of heat loss per unit length...Ch. 2 - The rate of heat flow per unit length q/L through...Ch. 2 - A 2.5-cm-OD, 2-cm-ID copper pipe carries liquid...Ch. 2 - A cylindrical liquid oxygen (LOX) tank has a...Ch. 2 - Show that the rate of heat conduction per unit...Ch. 2 - Derive an expression for the temperature...Ch. 2 - Heat is generated uniformly in the fuel rod of a...Ch. 2 - 2.29 In a cylindrical fuel rod of a nuclear...Ch. 2 - 2.30 An electrical heater capable of generating...Ch. 2 - A hollow sphere with inner and outer radii of R1...Ch. 2 - 2.34 Show that the temperature distribution in a...Ch. 2 -
2.38 The addition of aluminum fins has been...Ch. 2 - The tip of a soldering iron consists of a 0.6-cm-...Ch. 2 - One end of a 0.3-m-long steel rod is connected to...Ch. 2 - Both ends of a 0.6-cm copper U-shaped rod are...Ch. 2 - 2.42 A circumferential fin of rectangular cross...Ch. 2 - 2.43 A turbine blade 6.3 cm long, with...Ch. 2 - 2.44 To determine the thermal conductivity of a...Ch. 2 - 2.45 Heat is transferred from water to air through...Ch. 2 - 2.46 The wall of a liquid-to-gas heat exchanger...Ch. 2 - Prob. 2.47PCh. 2 - The handle of a ladle used for pouring molten lead...Ch. 2 - 2.50 Compare the rate of heat flow from the bottom...Ch. 2 - 2.51 Determine by means of a flux plot the...Ch. 2 - Prob. 2.52PCh. 2 - Determine the rate of heat transfer per meter...Ch. 2 - Prob. 2.54PCh. 2 - 2.55 A long, 1-cm-diameter electric copper cable...Ch. 2 - Prob. 2.56PCh. 2 - Prob. 2.57PCh. 2 - Prob. 2.58P
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- 2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section, 2.5 cm long and 0.25 cm thick, as shown in the figure. There are to be 100 fins per meter. The convection heat transfer coefficient, both for the wall and the fins, is estimated to be K. With this information determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall.arrow_forwardsteam exits the turbine of a steam power plant at 105 F and is to be condensed in a large condenser by cooling water flowing through copper pipes (k = 223 Btu/h-ft-F) of inner diameter 0.5 in. and outer diameter 0.7 in. at an average temperature of 70 F. The heat transfer of vaporization of water at 100F is 1037 Btu/lbm. The heat transfer coefficient are 1500 Btu/h-ft-F on the steam side and 35 Btu/h-ft-F on the water side. Determine the length of the tube required to condense steam at arate of 130 lbm/h.arrow_forwardThe heat exchanger wall has a surface area (0.5m *3m). The wall has 80 thin rectangular steel fins 0.5 cm thick and 1.25 cm high [k = 5 W(m K)]. The fins are 3 m long and the heat transfer coefficient of 40 W/(m? K) determine the rate of heat transfer if the overall temperature difference is 38°C.arrow_forward
- A hot-water pipe (k = 60 W/m K) in a house, made of 3/4-inch schedule 40 pipe (OD = 26.7 mm; thickness = 2.87 mm) is 15 meters long and contains water at 50 C. The air around the pipe is at 24 C. The heat transfer coefficient inside and outside the pipe are 1,135 W/m^2 K and 17 W/m^2 K, respectively. Insulation with thermal conductivity of 20 W/m K is to be added to the pipe. Determine the percent reduction of heat loss from the pipe due to insulation of 130 mm thick.arrow_forwardSteam flows in an insulated pipe at a temperature 130 C. The insideheat transfer coefficient is 79 W/m2-K and the outside coefficient is 15W/m2-K. The pipe is mild steel (k=57 W/m-K) and has an inside radiusof 50 mm and an outside radius of 57 mm. the pipe is covered with a25.4 mm layer( k=0.09 W/m-K). Determine the overall heat transfercoefficient if the surrounding air temperature is 21.1 C.arrow_forwardA cast iron pipe is used to transfer steam with an inlet temperature of 450 C. Inner radius of the pipe is 10 cm. The thickness of the pipe (k=18 W/(mK)) is 0.8 cm and there is an insulation (k=0.15 W/mK) over the pipe with a thickness of 7 cm. Environmental temperature is -10 C. Determine the steady heat loss from the pipe if the steam convection coefficient is 90 WI(m^2K) and environment convection coefficient is 18 W(m^2K)? Is insulation thickness enough? steam steam 486 W, yes 575 W, yes 625 W, yes 415 W, no nonearrow_forward
- 2. Consider water is to be heated in a tube equipped with electric resistance heater on its surface. The power rating of the heater and inner surface temperature are to be determined? Properties of tube and water are given below; Tube length L= 7 m, Tube Diameter of Tube D= 2cm, Surface heat flux is constant, water inlet/outlet Temp. Tinlet= 12 °C, Toutlet= 70°C For water q= 992.1 kg/m³ , V=0.008 m³/min, k=0.631 W/m°C, y= 0.658 10- m²/s, 4179 j/kg °C, Pr= 4.32 Cp=arrow_forwardA bare fuel rod has a diameter of 0.373 in and length of 12 ft. The volumetric heat generation rate for this rod is q′′′ = 10,000 kW/ft3. The heat produced by the rod is removed by water used as the coolant, at 2250 psia and 575 F. Find the heat transfer coefficient between the bare fuel rod and the coolant.The fuel rod surface temperature is 675 Farrow_forward(2) A sphere (k=204 W/m K) with inner diameter 4 cm and outer diameter of 8 cm. The inside temperature is 100C and the outer temperature 50c. Calculate the rate of heat transfer 2579 W O none 5127 W O 8612 W (2) A cylindrical tube with inner and outer radius are 10 mm and 20 mm respectively and the temperature of the inner surface is 300 C while for the outer surface is 100 C. If the rate of heat transfer per unite length is :3625.88 W/m , the tube conductivity is 2 W/mk O 4 W/mk none 8 W/mK Oarrow_forward
- A cold storage wall, whose components and dimensions are given below, is formed by connecting layers A, B, C, D, E and F in series and in parallel. The temperature of the outside air is 30 oC and the temperature of the inside of the warehouse is -4 oC. If the film heat transfer coefficient between the air in the warehouse and the E layer is 24 W/m2 oC and the film heat transfer coefficient between the outer surface of the flat wall (A and F layers surface) and the atmospheric air is 16 W/m2 oC; Calculate the heat transferred in a day. (KA= 0.17 W/m.K, kc 0.98 W/m.K) (kD= 0.21 W/m.K, KF= 0.58 W/m.K) XA=3cm B KBK= 0.024 W/m.K, KE=0.01 W/m.K, F C D E XB=14 cm Xc=Xp=8cm XE=10cm AF AC AD= A/3 h= 2 m 70 cmarrow_forwardAn electric motor is to be connected by a horizontal steel shaft (k 42.56 W/m.K), 25 mm in diameter to an impeller of a pump, circulating liquid metal at a temperature of 540°C. If the temperature of electric motor is limited to a maximum value of 52°C with the ambient air at 27°C and heat transfer coefficient of 40.7 W/m2.K, what length of shaft should be specified between the motor and pump? Steel shaftarrow_forwardYou want to increase the heat flux dissipated by a tube, OD = 2.5 cm, by placing cooling fins circular. The thickness, height and thermal conductivity of the fins are: 1mm, 1.25 cm and 160 W/mC, respectively. The fins are equally spaced such that there are 100 fins for every meter of tube length. If the The outer surface temperature of the tube is 170 C, the ambient temperature is 30 C, and the transfer coefficient of heat is h = 200 W/m2K, determine the increase (percentage) in the heat flux dissipated by the tube by placing the cooling fins. Take the efficiency of each fin to be 85%.arrow_forward
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