A counter-flow double-pipe heat exchanger is heating water from 20 to 80 C at a rate...

A counter-flow double-pipe heat exchanger is heating water from 20 to 80 C at a rate of 1.2 kg/s. The heating is provided by water at 160 C and a rate of 2 kg/s. The inner tube has a diameter of 1.5 cm, and the U is 640 W/m2 K. Use the effectiveness-NTU method to determine the length of the heat exchanger required.

Expert Solution

samet mamat answered 2 years ago

A counter-flow double-pipe heat exchanger is to heat water from 20ºC to 80ºC at a rate...

A counter-flow double-pipe heat exchanger is to heat water from 20ºC to 80ºC at a rate of 1.2 kg/s. The heating is to be accomplished by geothermal water available at 160ºC at a mass flow rate of 2 kg/s. The inner tube is thin-walled, and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/(m2.ºC), determine the length of the heat exchanger required to achieve the desired heating using the effectiveness-NTU...

A double-pipe heat exchanger is designed as an engine oil cooler. The flow rate of oil...

A double-pipe heat exchanger is designed as an engine oil cooler. The flow rate of oil is 5 kg/s, and it will be cooled from 60°C to 40°C through annulus (ID = 0.10226 m, OD = 0.1143 m). Sea water flows through the tubes (ID = 0.02664 m, OD = 0.03340 m) and is heated from 10°C to 30°C. The number of bare tubes in the annulus is 3, and the length of the hairpin is 3 m. Assume that...

A double-pipe heat exchanger is used to condense steam at 40°C saturation temperature. Water at an...

A double-pipe heat exchanger is used to condense steam at 40°C saturation temperature. Water at an average bulk temperature of 20°C flows at 2 m/s through the inner tube (copper, 2.54 cm ID, 3.05 cm OD). Steam at its saturation temperature flows in the annulus formed between the outer surface of the inner tube and outer tube of 6 cm ID. The average heat transfer coefficient of the condensing steam is 6,000 W/m2 ? K, and the thermal resistance of...

A double-pipe heat exchanger operating in counter current mode is to heat a fluid(Cp 1.7 kJ/kg...

A double-pipe heat exchanger operating in counter current mode is to heat a fluid(Cp 1.7 kJ/kg K) from 50°C to 95°C at a rate of 4.5 kg/s. The heating is to be accomplished by hot fluid (Cp=1.97 kJ/kg K) available at 200°C at a mass flow rate of 6 kg/s. The inner tube is thin-walled and has a diameter of 4 cm. If the overall heat transfer coefficient of the heat exchanger is 680 W/m2 °C, determine the length of...

Water is used to cool ethylene glycol in a 18.3-m-long double pipe heat exchanger made of...

Water is used to cool ethylene glycol in a 18.3-m-long double pipe heat exchanger made of 4-std and 2-std (both type M) copper tubing. The water inlet temperature is 15.6°C and the ethylene glycol inlet temperature is 82.2°C. The flow rate of the ethylene glycol is 9.07 kg/s, while that for the water is 13.6 kg/s. Calculate the expected outlet temperature of the ethylene glycol and determine the pressure drop expected for both streams. Assume counterflow, and place the ethylene...

You are studying the laminar flow of water in a pipe at 20˚C. The pipe is...

You are studying the laminar flow of water in a pipe at 20˚C. The pipe is 2 cm in diameter, and the pressure gradient driving the flow is 0.8 Pa/m. Find the x-sectional average velocity (Poiseuille’s Law) and the maximum velocity achieved at the centerline of the pipe (use the equation for Umax presented in the alternative derivation of Poiseuille’s Law). How many times greater is the maximum velocity compared to the average velocity? Is this ū/umax ratio constant or...

HEAT TRANSFER: HEAT EXCHANGER Oil flows in a heat exchanger with a mass flow rate of...

HEAT TRANSFER: HEAT EXCHANGER Oil flows in a heat exchanger with a mass flow rate of 20 kg/s and is to be cooled from 175 to 65°C with water as a coolant flowing at a rate of 30 kg/s and an inlet temperature of 12°C. The overall heat transfer coefficient is U = 1250 W/m2⋅K. a) Sketch the temperature profile and calculate the mean temperature for parallel flow, counter flow, and cross flow heat exchangers.. b) Determine the area required...

A heat exchanger with one body and eight pipe passes is designed. Water flows from the...

A heat exchanger with one body and eight pipe passes is designed. Water flows from the exhaust gas pipes as cold fluid by the body as cold fluid. Exhaust gas to the system at 210 ° C and entering at a temperature of 140 ° C The heat transfer coefficient is 392 W / m2K. On the other hand, water enters 16 iron (k = 38 W / mK) pipes with an inner diameter and outer diameter of 32 mm...

We are designing a double pass heat exchanger to heat ethanol from 25 C to 75...

We are designing a double pass heat exchanger to heat ethanol from 25 C to 75 C using steam. The flowrate of ethanol is 175 gpm = 0.011 m3 /s. We will start by using tubes with OD = 0.625”, ID = 0.50”. The ethanol is heated by low pressure saturated steam with Tin,s = 150 C, and Tout,s = 140 F. We eventually (Problem 8) want to calculate the heat needed to raise the temperature of the ethanol, and...

A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil...

A double pipe heat exchanger is to be designed to cool 5 gal/min of hot oil from 250°F to 120°F using 10 gal/min of cooling water available at 70°F. The heat exchanger is to consist of sections of 0.75 inch 16 BWG copper tubing inside 1.5 inch 16 BWG tubing; the water flows in the annular space. The shell-side heat transfer coefficient for this system is known to be 737 Btu/hr×ft2×°F. a) Estimate the required length of the countercurrent exchanger,...

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