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VAV Terminal Reheat Box Minimum Airflow Calculator

Easily calculate and compute vav terminal reheat box minimum airflow calculator with accurate equations, live formulas, and expert guidance.

Peak cooling airflow rate.

ASHRAE 62.1 breathing zone ventilation airflow.

Reheat coil entering water temperature.

Winter design heating load.

Calculated Result
300 CFM

Minimum Airflow Setting

Minimum Airflow Setting

300 CFM

Minimum Vav Airflow Setting Cfm

300

Turndown Ratio Percentage

25

Reheat Air Temperature Rise F

57.1

Discharge Supply Temperature F

112.1

300 — CFM

Calculation Breakdown

  1. Applied FormulaSizes minimum airflow setpoints and hydronic reheat temperature rise for Variable Air Volume (VAV) terminal units balancing fan energy savings against ASHRAE 62.1 outdoor air ventilation.V_{min} = \max(V_{turndown}, V_{ventilation}), \quad q = 1.08 \cdot CFM \cdot \Delta T

VAV Box Sizing Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.075150225300Minimum Airflow Setting

What Is the VAV Terminal Reheat Box Minimum Airflow Calculator?

This tool computes vav terminal reheat box minimum airflow calculator with high precision arithmetic.

How Does the VAV Terminal Reheat Box Minimum Airflow Calculator Work?

Sizes minimum airflow setpoints and hydronic reheat temperature rise for Variable Air Volume (VAV) terminal units balancing fan energy savings against ASHRAE 62.1 outdoor air ventilation.

VAV Terminal Reheat Box Minimum Airflow Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

Vmin=max⁡(Vturndown,Vventilation),q=1.08⋅CFM⋅ΔTV_{min} = \max(V_{turndown}, V_{ventilation}), \quad q = 1.08 \cdot CFM \cdot \Delta T

Sizes minimum airflow setpoints and hydronic reheat temperature rise for Variable Air Volume (VAV) terminal units balancing fan energy savings against ASHRAE 62.1 outdoor air ventilation.

How to Use the VAV Terminal Reheat Box Minimum Airflow Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

VAV Terminal Reheat Box Minimum Airflow Calculator Example

Input Values:

maximumPeakCoolingAirflowCfm:1200.0
occupantVentilationRequirementCfm:280.0
reheatWaterTemperatureEnteringC:60.0
targetZoneHeatingLoadBtuHr:18500.0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required CFM.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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