1. What is a Unit Heater Sizing Calculator for Warehouse?

Definition: This calculator estimates the required heating capacity (in BTUs) for a warehouse space based on its volume and desired temperature rise.

Purpose: It helps HVAC professionals and facility managers determine the appropriate size of unit heaters needed to adequately heat warehouse spaces.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( BTUs \) — Heating capacity required (BTU per hour)
• \( Cubic\ Feet \) — Volume of the space (length × width × height)
• \( Temperature\ Rise \) — Desired temperature increase above outdoor temperature (°F)
• \( 0.133 \) — Constant factor for standard air conditions

Explanation: The formula calculates the heat energy needed to raise the temperature of the air volume by the specified amount.

3. Importance of Proper Heater Sizing

Details: Correct heater sizing ensures energy efficiency, proper temperature control, and prevents equipment strain from over- or under-sizing.

4. Using the Calculator

Tips:

• Measure your warehouse dimensions accurately to calculate cubic feet
• Determine required temperature rise based on local climate and desired indoor temperature
• For spaces with high ceilings or poor insulation, consider adding 10-20% to the calculated BTUs

5. Frequently Asked Questions (FAQ)

Q1: What's the 0.133 factor in the formula?
A: This accounts for the heat capacity of air (0.018 BTU per cubic foot per °F) and converts minutes to hours (60 minutes/hour × 0.018 ≈ 0.133).

Q2: How do I calculate cubic feet of my warehouse?
A: Multiply length × width × height in feet. For irregular spaces, divide into rectangular sections and sum their volumes.

Q3: What temperature rise should I use?
A: Subtract your area's winter design temperature from desired indoor temperature (e.g., 70°F indoor - 10°F outdoor = 60°F rise).

Q4: Does this account for insulation?
A: This is a basic calculation. Poor insulation may require 20-50% more BTUs, while excellent insulation may need less.

Q5: Should I round up the BTU calculation?
A: Yes, it's recommended to round up to the nearest standard unit heater size available.