Question
In: Mechanical Engineering
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.
Solutions
samet mamat answered 1 year agoRelated Solutions
LMTD of a cross-flow heat exchanger is
LMTD of a cross-flow heat exchanger is
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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
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W/m2⋅K.
a) Sketch the temperature profile and calculate the mean
temperature for parallel flow, counter flow, and cross flow heat
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b) Determine the area required...
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22
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