Your Inner Monkey

Phys AnthroQuizzes8.5:Your Inner Monkey
Phys AnthroQuizzes8.5:Your Inner Monkey5 questionseach question 1 creditPlease look carefully

Thermodynamics II
Making Liquid Nitrogen
Question Description:
Perform basic design of a liquefaction system based on
the schematic shown, capable of making ̇ = 800 kg of
liquid nitrogen per hour. Note that the compressor
shown in the schematic has two stages with one
intercooler (heat exchanger), while the T-s diagram
below is for 4-stage compressor with three intercoolers.
Intercoolers greatly reduce the inlet temperature of the
inlet to the subsequent stage (see page 438). You will
need to start with two stages and then extend the analysis
to three stages with two intercoolers.
You can make the following assumptions:

  1. The makeup gas and the return nitrogen vapor from
    the regenerator are both at 100 kPa and 20○C.
  2. All intercoolers and the heat exchanger
    (aftercooler) reject heat to the ambient air and have
    the same approach temperature
    difference of 20○C.
  3. Each compressor stage has isentropic efficiency of
    85% and has the same pressure ratio PR
  4. All devices are well insulated
  5. Compressors and the expansion valve are the only
    devices, which significantly affect pressures
  6. Makeup gas replenishes all liquid removed
  7. You can make any other realistic assumptions about
    the designed system.
    Recall that in EES ‘N2’ refers to nitrogen ideal gas and
    ‘Nitrogen’ refers to real gas.
    Your design report should present the following:
    1) Complete setup by hand for EES for two-stage compressor
    2) Solution for a single value of PR around 20. The output should include:
    a) Maximum temperature in the system Tmax
    b) Quality x at the valve exit; make sure the state is not superheated
    c) Mass flow rate through the compressor m
    d) Total power requirement to drive the compressor ̇
    3) Selection of the optimal pressure ratio PR
    a) Vary PR and observe the variation of all the output parameters.
    b) Graph and discuss the results.
    c) Recommend the pressure ratio PR. Justify your recommendation.
    4) Repeat all the above steps using a 3-stage compressor with two intercoolers. (You must
    modify the EES code and save as a separate file). Note that much lower PR for each
    stage will be needed. How many compressor stages would you recommend and why?

Lab Assignment 44

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