HVAC Sizing - Design Calculators

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HVAC Sizing Calculator for UPS/Inverter Rooms

This calculator helps determine the required cooling capacity (HVAC size) for rooms housing Uninterruptible Power Supplies (UPS) or Inverter Drives. It considers heat gains from equipment, lighting, occupants, building fabric, and solar radiation, following industry-standard principles outlined by organizations such as ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers), ISO (International Organization for Standardization), and CIBSE (Chartered Institution of Building Services Engineers).

Select Units:

Room Dimensions

Room Length (m)

Room Width (m)

Room Height (m)

UPS/Inverter Heat Dissipation

For multiple UPS/Inverter units, add each unit separately. If you have manufacturer's heat dissipation data for multiple units, sum them up and enter the total value if you choose "Enter Manufacturer's Data" for a single unit.

UPS/Inverter Unit 1

Heat Input Method

Rated Power (kVA)

Load (%)

Efficiency (%)

Internal Heat Gains

Lighting Power Density (W/m²)

Number of Occupants

Other Equipment Heat Gain (W)

External Heat Gains (Fabric & Solar)

Wall U-Value (W/m²K)

Roof U-Value (W/m²K)

Floor U-Value (W/m²K)

Window Area (m²)

Window SHGC

Peak Solar Radiation (W/m²)

Door Area (m²)

Door U-Value (W/m²K)

Environmental Conditions & Infiltration

Desired Room Temp (°C)

Ambient Temp (°C)

Air Changes per Hour (ACH)

Ambient Relative Humidity (%)

Desired Room Relative Humidity (%)

Safety Factor

Safety Factor (%)

HVAC Sizing Results

Parameter	Value