What Is the Sensible Heat Ratio & Psychrometric Process Calculator?
The Sensible Heat Ratio (SHR = Qs / Qtotal) defines the slope of the room condition line on a psychrometric chart, establishing the proportion of sensible to total cooling load.
Selecting the correct Apparatus Dew Point (ADP) and cooling coil bypass factor ensures that both space temperature (sensible load) and relative humidity (latent load) are simultaneously satisfied.
This calculator computes room SHR, required supply air dry-bulb temperature, apparatus dew point, and volumetric supply airflow in m³/h.
How Does the Sensible Heat Ratio & Psychrometric Process Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
Sensible Heat Ratio & Psychrometric Process Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Psychrometric room condition line formulation linking Sensible Heat Ratio to Apparatus Dew Point and coil bypass.
How to Use the Sensible Heat Ratio & Psychrometric Process 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 Space (Qs = 35 kW, Ql = 15 kW, 24°C / 50% RH)
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
- A lower SHR (< 0.75) indicates high latent moisture loading (e.g. auditoriums, restaurants), requiring colder coil surface temperatures (low ADP).
- If the room condition line does not intersect the saturation curve, reheat is mandatory to prevent overcooling.
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.