Enter the vented steam mass flow and the feed water mass flow into the calculator to determine the deaerator vent rate.

Deaerator Vent Rate Formula

The following formula is used to calculate a deaerator vent rate.

DVR = VSMF / FWMF * 100

  • Where DVR is the deaerator vent rate (%)
  • VSMF is the vented steam mass flow rate (kg/s)
  • FWMF is the feedwater mass flow rate (kg/s)

To calculate Deaerator Vent Rate, divide the vented steam mass flow rate by the feedwater mass flow rate, then multiply by 100.

What is a deaerator vent rate?


A Deaerator Vent Rate is a measure of the percentage of mass that is converted to steam by a deaerator with respect to the inlet feedwater mass flow.

How to calculate Deaerator Vent Rate?

Example Problem:

The following example outlines how to calculate a Deaerator Vent Rate.

First, determine the feedwater mass flow rate. In this example, the feedwater is moving at a rate of 150 kg/s.

Next, determine the vented steam mass flow rate. In this case, the vented steam is moving at 50 kg/s.

Finally, calculate the Deaerator Vent Rate using the formula above:

DVR = VSMF / FWMF * 100

DVR = 50/150 * 100

DVR = 33.333%