Steam is being transported in a pipe at a chemical production facility. The outer diameter of the pipe is 8 cm, and the surrounding air temperature is 20 °C. On the surface of the pipe, the combined heat transfer coefficient is 35 W/m°K. The surface temperature of the pipe is 150 °C. Steady-state conditions exist. What is the rate of heat loss from the pipe to the surroundings per unit length of the pipe?

Steam is being transported in a pipe at a chemical production facility. The outer diameter of the pipe is 8 cm, and the surrounding air temperature is 20 °C. On the surface of the pipe, the combined heat transfer coefficient is 35 W/m°K. The surface temperature of the pipe is 150 °C. Steady-state conditions exist. What is the rate of heat loss from the pipe to the surroundings per unit length of the pipe?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Air flows steadily between two sections in a duct. At section (1), the temperature and pressure are T₁ = 87°C, and p₁ = 305kPa (abs), and at section (2), the temperature and pressure are T₂ = 182°C, P2 = 175 kPa (abs). Calculate the (a) change in internal energy between sections (1) and (2), (b) change in enthalpy between sections (1) and (2), (c) change in density between sections (1) and (2), (d) change in entropy between sections (1) and (2). (a) U2-U1= i (b) h₂-h₁ = (c) P2-P1= (d) $2-$1= J/kg J/kg kg/m³ J/(kg*K)
A piston/cylinder setup contains 1 kg of air at 20°C with an initial volume of V1=0.1 m3, as shown in Fig. Q7. Initially, the piston rests on some stops, but it is possible for it to move within the cylinder without friction. To lift the piston and start such motion, an air pressure of 1400 kPa is required. Now, heat is transferred to the system so that the temperature of the air reaches to a final value of 300°C. Fig. Q7 A. Which statement is true? The air can lift the piston before the temperature reaches to 300°C The air cannot lift the piston before the temperature reaches to 300°C
(2) The thermal expansion coefficient is given by: 1(av a =- (a) Would you expect the thermal expansion coefficient to appear to be first order or second order for a phase transition? Explain your answer. (b) Sketch the thermal expansion coefficient vs temperature for a phase transition.
Thermodynamics
DA Permeability, P m² solute(STP)' S-m - atmi m Diffusion Solubility, S [m' solute(STP)] m' solid - atm Solute Solid Coefficient (A) (B) T(K) Ref Table 1: Diffusivities and Permeabilities (B5) H2 Vulcanized rubber 0.85(10-") 0.342(10-19) 298 0.040 in Solids 298 0.21(10-º) 0.15(10-) 0.11(10-") 0.152(10-1") 0.054(10-1") 1.01(10-1) 0.070 N, CO, H; (B5) (BS) (B5) 298 0.035 298 0.90 Vulcanized 0.103(10-9) 0.180(10-9) neoprene 290 0.051 (B5) (B5) (R3) 300 0.053 H, O2 N2 Polyethylene 298 6.53(10-12) 4.17(10-") 1.52(10-12) 0.029(10-12) 0.0152(10-1) 303 (R3) (R3) 303 O2 Nylon 303 (R3) N2 303 (R3) Air English leather 298 0.15-0.68 × 10 * (B5) (B5) 306 H,O H,O Wax 0.16(10-1) 0.91-1.82(10-1") 4.86(10-15) 20.1(10-") Cellophane Pyrex glass 311 (B5) Не 293 (B5) 373 (B5) SiO2 2.4–5.5(10-4) 2.59(10-13) 1.3(10-*) Не 293 (B5) (B5) 0.01 Fe 293 Al Cu 293 (B5)
A horizontally-oriented cylinder contains an unknown noble gas at 42100 Pa and is sealed with a massless piston of radius 0.272 m. The piston is quasi-statically and isobarically moved inward 0.189 m, while 19500 J of heat is removed from the gas. Calculate the change in internal energy AU of the system. AU=
A pump withdraws water from a lake at a rate of 20 gpm and increase the pressure to Pgauge = 5 bar. The water temperature at the inlet and outlet of the pump are 22°C and 22.03°C respectively. Thekinetic and potential energies at the inlet and outlet are equal and the heat loss from the pump is negligible. Determine the pump efficiency
The ends of an insulated silver rod of radius 2.669 cm and length 44 cm are maintained at 32°C and 103°C. coefficient / constant! (a) What type of heat transfer is this? (b) What is the rate of heat flow through the rod? W (4 s.t.)
Air with a dry-bulb temperature of 38oC and a wet-bulb temperature of 27oC is scrubbed with water to remove dust. Water temperature is maintained at 25oC. The air leaving the scrubber is in equilibrium with water. It is then heated to 93oC in an air preheater and admitted to an adiabatic rotary drier. The air leaves the drier at 49oC. The material losses moisture at a rate of 0.05 kg of water per kg of product. The total product is 1000 kg/h. Determine the following (Use a psychrometric chart): a) Total weight of dry air used per hour. Answer: b) Total volume of air leaving the drier. Answer:
A 1.5 mol of perfect gas molecules with Cpm = 20.8) K-1 mol-1 is initially at 230 kPa and 315 K. It undergoes reversible adiabatic expansion until its pressure reaches 170 kPa. Calculate the final volume and temperature and the work done
pls show detailed explanation and solution pls
Water with a temperature of 15 ° C approaches vertically to a cylinder with a surface temperature of 120 ° C and a diameter of 25 mm. The velocity of the water has been given as 1 m / s. What is the heat transfer rate in kW / m2 ?