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Homework Help: IC Engine Test - Practical

  1. May 18, 2012 #1
    1. The problem
    We were given a excel sheet, with RPM, Torque, Power, Bmep, Fuel mass flow rate, Airmass SFC, Engine Air inlet and Exhaust temp.

    The engine capacity is 2.2litre 4 stroke.
    Fuel specifications: 50 Cetane (0.05% Sulphur)
    Coolant = Fresh water with 45% glycol mix.

    I am having problems finding Volumetric Efficiency, the fuel calorific value and coolant specific heat.

    2. Relevant equations

    3. The attempt at a solution

    I found a VE(volumetric efficiency) of 72.808% for the first speed of 1000RPM
    with eq: VE=(9411*HP*BSFC)/(displacment*RPM)

    but seem to get the rest above 100% eg @2000RPM VE=133.856%
    I have tried more than one equation, this seemed to get closer to the 70% VE it should be.

    I also need to do a heat balance thus i require the calorific value of the diesel (it is not bio diesel fuel) as well as cp for the coolant.

    Any assistance would be much appreciated.
    Last edited: May 18, 2012
  2. jcsd
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