Table of Contents
Energy recovery in HVAC systems involves capturing and reusing energy from exhaust air to improve efficiency and reduce energy consumption. Proper calculations and design considerations are essential for effective implementation.
Basics of Energy Recovery
Energy recovery systems transfer heat or cooling from exhaust air to incoming fresh air. This process reduces the load on heating and cooling equipment, leading to energy savings and improved indoor air quality.
Calculations for Energy Recovery
Calculations involve determining the amount of energy that can be recovered based on airflow rates and temperature differences. The key parameters include:
- Airflow rate (CFM or m³/h)
- Temperature difference between exhaust and incoming air
- Specific heat capacity of air
- Efficiency of the heat exchanger
The recovered energy (Q) can be estimated using the formula:
Q = ρ × Cp × ΔT × Qair × η
Design Considerations
When designing energy recovery systems, several factors must be considered:
- Type of heat exchanger (plate, rotary, run-around coil)
- Air quality and filtration requirements
- Space constraints and installation costs
- Maintenance and durability of components
Proper integration with the HVAC system ensures optimal performance and energy savings.