1. Saturated steam at 500 K flows in a 0.20 m inside diameter, 0.21 m outside diameter pipe. The pipe is covered with 0.08 m of insulation with a thermal conductivity of 0.10 W/m-K. The pipe's conductivity is 52 W/m-K. The ambient temperature is 300 K. The unit convective coefficients are h₁ = 18,000 W/m²-K and ho = 12 W/m²-K. Determine the heat loss (kJ/min) from 4 m of pipe. • show conversions, units, and box in your final answers

Hot fluid "C= 2562 J/kg.k , Pr=51.3, µ = 5.22E-3 Pa.s, k= 0.260 W/m.K" flows at 1.3 kg/min inside a 3-mm diameter, thin- walled tube. The tube is coiled and submerged in a water bath maintained at 23°C. The fluid experiences a temperature drop of 60°C and leaves the tube at 35°C. What is the required length of the tube "m"? Neglect heat transfer enhancement associated with the coiling. Assume fully developed flow, if turbulent flow use Dittus-Boelter equation: Nu = 0.023 Re 0.8 Pr. Select one: A. 25.62 В. 35.27 C. 27.95 D. 30.61 E. 33.27

To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D;, 2 = 250 mm and wall thickness t, = t;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (kp = 0.03 W/m-K) between the two pipes does not exceed its maximum service temperature of T, max = 70°C. The ocean water is at T,o = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²-K. The convection coefficient associated with the flowing crude oil is hị = 450 W/m²-K. (2) It is proposed to enhance the performance of the…

A 10 cm thick and 1 m wide long steel plate is immersed in an oil bath at T0=40°C when the temperature is T1=240 ° C. Heat transfer coefficient between plate and oil is h=600 W/m2K and p=7833 kg/m3 for steel, cp=465 J/kgK, k=43 W/mK, (alpha) = 1.2x10^(-5) m2/s. A) After how long the core temperature of the steel plate becomes 100 ° C. B) What is the temperature inside 3 cm from the surface of the steel plate happens. C) Within this period, per unit length plate what is the amount of heat that passes.

16-26 In a certain experiment, cylindrical samples of diameter 4 cm and length 7 cm are used (see Fig. 16–9). The two thermocouples in each sample are placed 3 cm apart. After initial transients, the electric heater is observed to draw 0.6 A at 110 V, and both differential thermometers read a temperature difference of 8°C. Determine the thermal con- ductivity of the sample. Answer: 98.5 W/m.K

Please help me with this question. This is for review purposes. Thank you!

Hot fluid "C= 2562 J/kg.k, Pr=51.3, µ = 5.22E-3 Pa.s,k= 0.260 W/m.K" flows at 1.3 kg/min inside a 3-mm diameter, thin- %3| walled tube. The tube is coiled and submerged in a water bath maintained at 23°C. The fluid experiences a temperature drop of 60°C and leaves the tube at 35°C. What is the heat transfer rate "Watts"? Neglect heat transfer enhancement associated with the coiling. Assume fully developed flow, if turbulent flow use Dittus Boelter equation: Nu = 0.023 Re 0.8 Pr. Select one: А. 3630.4 B. 4196.6 C. 2964.2 D. 3930.1 Е. 3330.6

A 10 cm thick and 1 m wide long steel plate is immersed in an oil bath at T0 = 40 ° C when the temperature is Ti = 240 ° C. According to the heat transfer coefficient between the plate and oil h = 600 W / m2K and p = 7833 kg / m3 for steel, cp = 465 J / kgK, k = 43 W / mK, α = 1.2x10-5m2 / s (a) after how long the core temperature of the steel plate becomes 100 ° C (b) What is the temperature within 3 cm from the surface of the steel plate (c) What will be the amount of heat transferred to the unit length plate during this time?

Need help I'm not sure where I went wrong on this

The interior of a refrigerator whose dimensions are 0.05 x 0.05 dam base area and 1.25 m high, must be kept at 4 °C. The refrigerator walls are constructed of two steel sheets (k= 35 kcal/h.m.°C) 3 mm thick, with 65 mm of material insulation (k=0.213 kcal/h.m.°C) between them. The film coefficient of the inner surface is 10 kcal/h.m².°C, while on the external surface it varies from 8 to 12.5 kcal/h.m².°C. Calculate: a) The power (in HP) of the refrigerator motor so that the heat flux removed from the inside the refrigerator maintain the specified temperature, in a kitchen whose temperature can vary from 21 to 36 °C; b) The temperatures of the inner and outer surfaces of the wall. Given 1 HP = 641.2 Kcal/h