Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintaineI thickness I mm are attached to the tube. The space between the fins is 3 mm, and thus there are 250 fins per of 40 W/m2 °C. a. Determine the total heat transfer rate from the pipe per one meter of its lengn. b. Determine the overall effectiveness of the fin array, 25 cm T.-25 C INOC I mm 3 mm
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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 5510.8 The heat transfer coefficient of a copper tube (1.9-cm II) and 2.3-em OD) is on the inside and on the outside, but a deposit with a fouling factor of (based on the tube outside diameter) has built up over time. Estimate the percentage increase in the overall heat transfer coefficient if the deposit were removed.3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is , estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.
- 2.7 A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue. Both surfaces of this chip-aluminum system are cooled by air at , where the convective heat transfer coefficient of air flow is . If the heat dissipation per unit area from the chip is under steady-state conditions, draw the thermal circuit for the system and determine the operating temperature of the chip.2.45 Heat is transferred from water to air through a brass wall . The addition of rectangular brass fins, 0.08 cm thick and 2.5 cm long, spaced 1.25 cm apart, is contemplated. Assuming a water-side heat transfer coefficient of and an airside heat transfer coefficient of , compare the gain in heat transfer rate achieved by adding fins to (a) the water side, (b) the air side, and (c) both sides. (Neglect temperature drop through the wall.)3. Hot water flows inside a 2.5 cm inner diameter tube, the tube has a wall thickness of 0.8 mm (tube length=1m) with a conduction resistance of 0.000183 °C /W, the inner and outer convection resistance are (0.00662, 1.196 °C /W) respectively. The overall heat transfer coefficients depending on the outer diameter of the pipe is equal to: A. 9.94 W/m2 °C B. 200 W/m² °C C. 0.5 W/m² °C D. None of them
- Q. IsTeam at 605 K Flow in Alpipe with thermal conductivity K=188 W/m.c whose in and out diamter D₁ = 2 inche and D₂= 58 mm respectively. The pipe is covered with Turo insulation material First was glass wool K=0,06 and second cyas insulation K=0,01 w/m.c. Firs.T 33mm and second 13 mm, Heat is Lost to the surrounding al Too Too2 = 288K by natural convection and radiation, with combined. heat Transfer coefficent of he-22,8 W/m²c. Taking heat Transfer coefficent inside pipe To be hi-48.9 W/m² c. Find Heat loss poo length and Temp. dropp. ?? *Aplane wan of thickness 2h Was an internal heat generation that varies according -io cosax where oasthe heat genevated per unit volume at the centr of the wall ( X=0) cand (chis coustant. if both sides of the wall are maintained at acons trant te mp (Tw)-derive an expressian for the (Tル total heat loss from the wan per anit fuce face area suri. A very long rod 5 mm in diameter has one end maintained at 100 oC. The surface of the rod is exposed to ambient air at 25 oC with convection heat transfer coefficient of 100 W/m2-K and thermal conductivity is 180 W/m-K. Determine the temperature distribution along the rod and What is the heat loss. ii. Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 500 W/m2◦C. The convection coefficient on the outside is 12 W/m2 ◦C. Calculate the overall heat-transfer coefficient.
- Q. IsTeam at 605 K Flow in Alpipe with thermal conductivity K-188 W/m. c whose in and out diamter D₁ = 2 inche and D₂=58mm respectively. The pipe is covered with Tuto insulation material First was glass wooL K=0,06 and second cuas insulation K=0,01 w/m.c FirsT 33mm and second 13 mm, Heat is Lost to the surrounding at Too' Too2=288K by natural convection and radiation, with combined Theat Transfer coefficent of h=22,8 W/m² C, Taking heat Transfor coefficent inside pipe To be hi-48.9 W/m². C. Find Heat loss por length and Temp. dropp. ??Calculate the overall heat transfer coefficient for the following cases: (a) Heat is transferred across Im?of a 3-cm thick plate made of steel of k = 36.4 W/ (m-K). A liquid flows on one side with a heat transfer coefficient h, = 4000 W/ (m2K) and the other side is exposed to air with hy= 12W/(m²-K). Assume a foul- ing heat transfer coefficient of h,- 3000 W/(m-K) on the liquid side. (b) Same as part (a), with the air replaced by condensing steam, h, = 6000 W/(m2K). () Same as part (a) with the liquid replaced by a flowing gas, h = 6 W/(m2K). %3D %3DQ2) A central processing unit (CPU), also called a central processor or main processor, is the t important processor in each computer. Thermal design of CPUs is vital for its stable ration. Consider the design problem described below. w = 5 cm. N-1 H L=5 cm w=5 cm. L=5 cm. K-200 W/mK Kar 0.025 W/mK T= 100 C Tair= 25 C Vair=1.0 m/s Vair1.3 x 10-5 m²/s Pr=0.72