Engineering CalculationCooling Load Calculator in TR - Room, Building and AHU
Estimate the air-conditioning load of a room, building or AHU in TR, with sensible, latent and fresh-air parts and the supply air quantity.
Open the calculator →Formula
Q (kW) = ṁ × (h1 − h2), ṁ = air flow (m³/s) × 1.2 kg/m³
1 TR = 3.517 kW
Worked example
AHU 5 m³/s, air enthalpy 60 kJ/kg in and 40 kJ/kg off the coil (read from a psychrometric chart)
Q = 5 × 1.2 × (60 − 40) = 120 kW = 34.1 TR
Where engineers use it
- HVAC sizing for offices and plants
- Checking an AHU or DX unit
- Clean room and control room loads
How to use
- Click Open the calculator. It runs free in your browser, on desktop or phone.
- Enter your values. Units and typical ranges are shown next to each input.
- Read the result and the step-by-step working, then print or add it to your Project BOQ.
Questions
Is there a quick thumb-rule method?
Yes, the Civil suite has an HVAC tonnage estimate by occupancy, and the MEP suite covers full building services.