Chapter 8E

8E. Heat capacity and heat load for liquid hydrocarbons Back to Main

This page is used to determine heat capacity and heat load for liquid hydrocarbons . Heat capacity is the quantity of heat required to raise the temperature of a sample of matter by 1 temperature unit.

The heat capacity for hydrocarbon liquid may be estimated from the equation 8.7

Metric: Cpa = 2.96 - 1.34 g + T (0.00620 - 0.00234 g)

English: Cpa = 0.68 - 0.31 g + T (0.00082 - 0.00031 g)

Where: Cpa = heat capacity Metric kJ/kg·ºC English Btu/lb-ºF

> > g = liquid specific gravity (water = 1.0)

> > T = average temperature

To obtain the heat load, the heat capacity is found at the average temperature and multiplied by gas mass flow rate and the change in temperature (DT).

To carry out the heat capacity and heat load calculation the relative density, liquid flow rate, inlet temperature and the outlet temperature must be entered into the appropriate entry space. To do so use the mouse to click the curser in the entry space and input the data.

Liquid Relative Density is the density of a liquid divided by the density of pure water. At 15ºC [60ºF] the density for pure water is 1.0 g/cm³.

Liquid Flow Rate is the rate at which the liquid flows through the system

Inlet temperature is the temperature at which the liquid flows into the system.

Outlet temperature is the temperature at which the liquid flows out of the system.

Once the relative density, liquid flow rate, inlet temperature and the outlet temperature 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.

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