Question

In: Mechanical Engineering

Water (cp=4179 J/kg·K) at 30 °C flows on the inside of a steel tube with 25...

Water (cp=4179 J/kg·K) at 30 °C flows on the inside of a steel tube with 25 mm inner diameter and 0.4 mm wall thickness at a flow rate of 0.4 kg/s. The tubes forms inside of a counter flow double pipe heat exchanger. Engine oil at 100 °C flows in the annular space with a flowrate of 0.1 kg/s. The outlet temperature of the oil is 60 °C. The material of the heat exchanger is carbon steel with k=45 W/m·K. The inner diameter of the outer tube is 55 mm. If the length of a hairpin is 5m, calculate the number of hairpins ignoring the fouling resistances.

please can you help me course name heat exchangers.

Solutions

Expert Solution


Related Solutions

Made of steel (ρ = 7920 kg / m3 cp = 580 J / kg °...
Made of steel (ρ = 7920 kg / m3 cp = 580 J / kg ° K, k = 52 W / mK) with a diameter of 70 mm and a length of 8000 mm The rod is first kept in a room with an ambient temperature of uniform 40 ° C. Rod then film coefficient It enters its oven of 373 W / m2K at 900 ° C. After 2273 seconds, a.) Find the center axis temperature of the...
A stainless steel ball (? = 8055 kg/m3 , CP = 480 J/Kg? K ) of...
A stainless steel ball (? = 8055 kg/m3 , CP = 480 J/Kg? K ) of diameter D = 15cm is removed from the oven at a uniform temperature of 350 Degrees C. The ball is then subjected to the flow of air at 1 atm pressure and 30 degrees C with a velocity of 6m/s. The surface temperature of the ball eventually drops to 250 degrees 250 degrees C. Determine the average convection heat transfer coefficient during this cooling...
1. Two liters of methanol at -30 ˚C and two liters of water at 25 ˚C...
1. Two liters of methanol at -30 ˚C and two liters of water at 25 ˚C are mixed in an insulated glass cylinder that has a mass of 2 kg. The heat capacity of glass is 0.9 kJ/kgK.Using the properties of the other substance in the appendix of the book, determine thefinal temperature of the mixture. at room temp
A fire-tube boiler made from carbon steel in which fuel gas flows within the tube while...
A fire-tube boiler made from carbon steel in which fuel gas flows within the tube while the boiler feed-water along with condensate from the plant flows on the shell-side. Visual inspection revealed heavily localized tubercles were seen on the outside surface of several tubes. After about 11 months of operation, the pipe was leaked and visual inspection found pin holes outside surface contain loose brownish rust. The rust contained chloride and was acidic in nature. Select appropriate corrosion prevention to...
Air at 30 C flows at 10 m/s across an in-line tube bank consist of 5...
Air at 30 C flows at 10 m/s across an in-line tube bank consist of 5 rows with 10 tubes per row. The diameter of the tube is 5 cm and the tube pitch is 13 cm. Water flowing in tube maintains the tube surface temperature at 80C find the following: a) the air temperature at the outlet of the tube b) the convective heat transfere per unit length per tube to the air ( it is heat transfer problem...
A shell-and-tube heat exchanger is to used to heat water (in the tube side) from 30...
A shell-and-tube heat exchanger is to used to heat water (in the tube side) from 30 deg C to 40 deg C at a mass flow rate of 4 kg/s. The fluid used for heating (shell side) is water entering at 90 deg C with a mass flow rate of 2 kg/s. A 1-2 STHE is used and the overall heat transfer coefficient based on the inside area is 1390 W/m2-K. The tubes are 1.875 in diameter (inside) and require...
Saturated water at 20 C flows inside the annular region formed by two concentric circular tubes....
Saturated water at 20 C flows inside the annular region formed by two concentric circular tubes. The OD=71 in mm, while the ID= 101 mm, The mass flow rate is 0.02 kg/s. , The outer surface is insulated, and the inner surface is kept at 71 C, . Determine the heat transfer coefficient from inner surface to water   under fully developed velocity and temperature flow conditions. Use the following constant thermo-physical properties of water, ρ = 1000kg/m3; μ = 1×10-5...
1. Engine oil (cp = 2100 J/kg-°C) is to be heated from 20 °C to 60...
1. Engine oil (cp = 2100 J/kg-°C) is to be heated from 20 °C to 60 °C at a rate of 0.3 kg/s in a 2-cmdiameter thin-walled copper tube by condensing steam outside at a temperature of 130 °C (hfg = 2174 kJ/kg). a. For an overall heat transfer coefficient of 650 W/m2 -°C, determine the rate of heat transfer and the length of tube required to achieve it. Determine also the rate of steam condensation, in kgsteam/sec. (Ans: 25.2...
A shell-and-tube heat exchanger heats oil from 2°C to 35°C using hot water. The oil flows...
A shell-and-tube heat exchanger heats oil from 2°C to 35°C using hot water. The oil flows in the shell in a single pass. Water flows in 5 copper tubes with a total (all tubes) rate of 0.5 kg/s. Each tube makes 4 passes through the shell and the length per pass is 4 m. The tube inner and outer diameters are 15 mm and 19 mm. The water enters at 95°C and leaves at 29°C. 1. Estimate the average convection...
200g of water at 30°C is put in a 1000 W (J/s) microwave oven. For simplicity...
200g of water at 30°C is put in a 1000 W (J/s) microwave oven. For simplicity assume that all the energy produced by the microwave goes into the water. The microwave runs for 2 minutes. Constants for H2O: TMP=0°C, TBP=100°C, ΔHmelt = 333.5 kJ/kg, ΔHvap = 2257 kJ/kg, cliquid=4.18 kJ/kgK, cgas=1.87 kJ/kgK. a) Calculate the total amount of energy transferred to the water. Show your work. b) Draw the Three-Phase Diagram (temperature versus energy added) and label the initial state...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT