What Is the HVAC Sensible & Latent Cooling Load Supply Airflow Calculator?
Conditioning an indoor space requires supplying air at a sufficiently cold temperature and low moisture content to absorb occupants, equipment, and solar heat gains.
Supply airflow rate is sized primarily by the sensible heat equation to offset room dry-bulb temperature gains, while the coil apparatus dew point handles latent condensation loads.
This calculator computes dry air mass flow in kg/s, volumetric airflow in both m³/h and CFM, and Sensible Heat Ratio (SHR) to size central AHUs and VAV air handlers.
How Does the HVAC Sensible & Latent Cooling Load Supply Airflow Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
HVAC Sensible & Latent Cooling Load Supply Airflow Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
First law steady sensible enthalpy balance governing forced convection air conditioning systems.
How to Use the HVAC Sensible & Latent Cooling Load Supply Airflow Calculator
- Enter your primary measurements in the input fields above.
- Select your preferred units (e.g. metric or imperial) if applicable.
- Review or adjust operational assumptions such as field efficiency.
- Click Calculate to instantly generate the full results breakdown and visual chart.
- Use the Reset button at any time to clear the form and test a new scenario.
Step-by-Step Example Calculation
Commercial Office Suite (25 kW Sensible, 5 kW Latent, 11°C ΔT)
Input Values:
Understanding Your Result
Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.
Factors That Affect the Result
Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.
When Should You Use This Calculator?
Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.
Assumptions & Limitations
- Sensible Heat Balance: Q_s = m_dot · c_p · (T_room - T_supply).
- Air specific heat c_p ≈ 1.006 kJ/(kg·K); standard air density ρ ≈ 1.204 kg/m³.
- Required Air Mass Flow: m_dot = Q_s / [1.006 · (T_room - T_supply)] in kg/s.
- Volumetric Flow Rate: V = (m_dot / ρ) · 3600 in m³/h (1 m³/h ≈ 0.5886 CFM).
- Sensible Heat Ratio: SHR = Q_s / (Q_s + Q_l).
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.