LMTD of a cross-flow heat exchanger is

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Amanda K answered 2 years ago

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...

In a thermofluids lab, a student is analysing a prototype single-pass cross-flow heat exchanger used to...

In a thermofluids lab, a student is analysing a prototype single-pass cross-flow heat exchanger used to cool water from 90oC to 60oC by transferring its heat to an air stream with an inlet temperature of 30oC without mixing. The water and air flow rates are 42,000 kg/h and 180,000 kg/h respectively. Assume that for the water cp=4.18kJ/kg⋅oC and for the air cp=1.02kJ/kg⋅oC. Calculate the log mean temperature difference for this heat exchanger.

define heat exchanger mechanical flow switch

Hot exhaust gases, which enter a tube heat exchanger with cross-flow fins (both unmixed fluids) at...

Hot exhaust gases, which enter a tube heat exchanger with cross-flow fins (both unmixed fluids) at 1.5 kg/s and 250 oC, are used to heat pressurized water at a speed of 1.0 kg/s and 35 oC. The specific heat of the exhaust gas is 1.0 kJ/kg K, and the overall heat transfer coefficient based on the surface area of the gas side is Uh = 100 22 W/m K and Ah = 40 m . Calculate heat transfer for heat...

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...

Which one of the following statements are correct? In a counter-flow heat exchanger, the exit temperature...

Which one of the following statements are correct? In a counter-flow heat exchanger, the exit temperature of the cold fluid can never reach the exit temperature of the hot fluid. In a parallel flow heat exchanger the exit temperature of the cold fluid is always greater than the exit temperature of the hot fluid. In a counter flow heat exchanger the exit temperature of the cold fluid is always greater than the exit temperature of the hot fluid. In a...

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...

Subject: Heat exchanger Lab Question: 1.1) in heat exchanger analysis, the following quantities are used. Explain...

Subject: Heat exchanger Lab Question: 1.1) in heat exchanger analysis, the following quantities are used. Explain what each means and give a formula for each. Assume the mass flow rates, fluid properties, inlet, temperatures, and length and diameters of the heat exchanger are known. a) Overall heat transfer coefficient. UA. b) A number of transfer units, NTU. c) Effectiveness, e 1.2) what is the hydraulic diameter and why is it useful for double-pipe heat exchanger analysis?

What is called Supertargetting in Heat Exchanger Network Design? How Heat Exchanger Network Design can be...

What is called Supertargetting in Heat Exchanger Network Design? How Heat Exchanger Network Design can be done by paying attention to Supertargetting?

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.

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