Chapter 8G

8G. Latent heat of hydrocarbon mixtures Back to Main

This page is used to determine the latent heat of hydrocarbon mixtures. The latent heat is the amount of energy needed to change phase from liquid to vapor. Energy must be supplied on vaporization; it is released on condensation. The following equation represents a correlation for latent heat of hydrocarbon mixtures at or near atmospheric pressure ( Equation 8.10.)

Metric: Dh L = (4.19)(T/M) [8.75 + 4.57 log T]

English: Dh L = (T/M) (7.58 + 4.57 log T)

Where: T = average boiling point

Dh L = latent heat

M = molecular weight

To carry out the latent heat calculation the Temperature, Pressure, and Molecular Weight of the mixture must be entered into the appropriate entry space. To do so use the mouse to click the courser in the entry space and input the data.

Once Temperature, Pressure and Molecular weight of the mixture has been entered, select Run to execute the solution.

To convert unit values of data, please refer to “Set Auto Convert and Unit Conversion” in the main page.

If Molecular Weight of the mixture is not known while the compositions are available, Molecular Weight can be calculated using the following equation:

MW = S (MWi yi )

Where: MWi = Molecular Weight of component i

yi = is the mole fraction of component i in the mixture

Screen 5.A in Chapter 5, Volume1 of GCAP can help you to find the molecular weight of a paraffinic hydrocarbon mixture. After any calculation is done in Screen 5.A, the molecular weight of the feed will be displayed as a part of the results.

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