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?

Definition:

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%