程序代写 Shell and Tube Exchangers

Shell and Tube Exchangers

Shell and Tube Exchangers

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Plate and Frame Heat Exchanger

Fin Fan Cooler

Double Pipe Heat Exchanger

Cross Flow Heat Exchanger

Key Issues Governing Heat Transfer
Temperature difference between hot and cold streams
Heat transfer area
Flow arrangement (turbulence, friction – fluid mechanical issues)
Design requirements (heater vs cooler, phase change, operating pressure, maintenance needs)
Fouling of heat exchanger (additional “resistance”)

Goal of heat exchanger analysis
What is the “duty” of the heat exchanger (heat transfer rate required)
What surface area is required, and therefore how big does the exchanger need to be?
What outlet temperatures need to be met?
What is the effect of fouling on the heat exchanger and how does this affect plant efficiency, emissions, cost, etc
How often is maintenance required?
Two analytical approaches:
LMTD Method: known outlet temperatures
Effectiveness–NTU: unknown outlet temperatures

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