What Is the Enthalpy Energy Recovery Wheel (ERV) Effectiveness Calculator?
Rotary energy recovery wheels (enthalpy wheels) transfer sensible heat and latent moisture between building exhaust air and incoming fresh outdoor ventilation air.
By pre-cooling and dehumidifying outdoor air in summer and pre-heating and humidifying in winter, energy recovery ventilators (ERVs) reduce central chiller and boiler plant sizing.
This calculator applies AHRI Standard 1060 effectiveness models to determine supply air discharge conditions and thermal energy recovery rate (kW).
How Does the Enthalpy Energy Recovery Wheel (ERV) Effectiveness Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
Enthalpy Energy Recovery Wheel (ERV) Effectiveness Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
AHRI 1060 sensible and latent energy transfer relations for counter-flowing air streams in a rotating desiccant matrix.
How to Use the Enthalpy Energy Recovery Wheel (ERV) Effectiveness 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
Summer Office Fresh Air ERV (3,500 m³/h)
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
- Discharge Air Temperature: T_sa = T_oa + ε_s · (T_ea - T_oa).
- Sensible Heat Duty: Q_s = m_dot · c_p · ΔT (where c_p = 1.005 kJ/kg·K).
- Total Enthalpy Duty compounds sensible and latent moisture exchange per AHRI 1060 test standards.
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.