Q2/ A metal plate of 4mm thickness (k = 95.5 W/m°C) is exposed to vapor at 100°C on one side and cooling water at 25°C on the opposite side. The heat transfer coefficients on vapor side and waterside are 14500 W/m^2°C and 2250 W/m^2 °C respectively. Determine the overall heat transfer coefficient
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Q: Q2/ A metal plate of 4mm thickness (k = 95.5 W/m°C) is exposed to vapor at 100°C on one side and…
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- 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 573 338 122 552. 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=A 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 F
- Steam exiting the turbine of a steam power plant at 40°C is to be condensed in a large condenser by cooling water flowing through copper pipes (k = 386 W/m•°C) of inner diam- eter 1 cm and outer diameter 1.5 cm at an average temperature of 20°C. The heat of vaporization of water at 40°C _is 2407 kJ/kg. The heat transfer coefficients are 13,000 W/m2.°C on the steam side and 200 W/m2.°C on the water side. Determine the length of the tube required to condense steam at a rate of 115 kg/h. Answer: 622 m Steam, 40°C 115 kg/h Cooling water Liquid waterA 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 ToA cast iron pipe is used to transfer steam with an inlet temperature of 350 C. Inner radius of the pipe is 5 cm. The thickness of the pipe (k=20 W/(mK)) is 0.5 cm and there is an insulation (k=0.07 W/mK) over the pipe with a thickness of 4 cm. Environmental temperature is -5 C. Determine the steady heat loss from the pipe if the steam convection coefficient is 70 WI(m^2K) and environment convection coefficient is 20 W/(m^2K)? Is insulation thickness enough? steam steam
- A 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 nonesteam 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.As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 2. Ts.2} 1. Ts,1} Steam Insulation (a) If the insulation is 22.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (d) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q), in W/m, and outer surface temperature T, 2, in K, for the steam pipe with the inner surface temperature fixed at T,1 = 800 K, inner radius ri = 0.06 m, and outer radius r2 = 0.08 m. The outer surface is exposed to an airflow (T = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur = T = 25°C. The surface emissivity of calcium silicate is approximately 0.8.
- Steam condenses at 100°C on the outer surface of a pipe with a thermal conductivity of 180 J/ms°C. The surface heat transfer coefficient of the water flowing in the pipe is 4000 J/m²s°C, and the heat transfer coefficient created by the steam condensing outside is 10000 J/m²s°C. The length of the pipe is 5 m and the thread diameter is 25 mm. Since the pipe thickness is 1 mm, calculate the total heat transfer coefficient and the rate of heat transfer from the condensed steam to the water at 15 °CQuestion 6 1 pts A composite wall constructed of 2.5cm of steel (k-60.5 W/m-K) and 5.0 cm of aluminum (k177W/m-K) separates two liquids. The liquid on the steel side has a film coefficient of 15W/m²-K and a temperature of 400degC. The liquid on the steel side has a film coefficient of 30W/m² and a temperature of 100degC. Assume steady state conditions, what is the temperature at the steel-aluminum interface in deg CAn 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 shaft