Technological Innovation and Application Value of Residential Energy Recovery Ventilation Systems
System Core Principles and Technological Evolution
Energy recovery ventilation systems (ERV/HRV) transfer energy between exhaust and fresh air through a heat exchange core. Their technical principles can be categorized into two types: sensible heat recovery and total heat recovery. The third-generation ERV system utilizes the WASSI-III energy recovery module, which improves heat exchange efficiency by 5%-10% compared to traditional models. This system can reduce CO₂ emissions by 0.5 tons per year for a 100-square-meter residential building. German practice demonstrates that if two million gas-heated buildings were fully equipped with high-efficiency ERVs, the potential annual emission reduction could reach millions of tons.
System Selection and Design Key Points
Climate Adaptability Selection:
HRV (sensible heat recovery) is preferred in dry areas.
ERV (full heat recovery) is recommended in high-humidity areas.
Key Parameters:
Air Volume Range: 100-100,000 m³/h (calculated at an air exchange rate of 0.6 times/h)
Heat Recovery Efficiency: 70%-80% for sensible heat recovery, 60%-75% for full heat recovery.
Pressure Loss Control: ≤50 Pa (meets passive house airtightness requirements)
Quantitative Analysis of Energy Savings
| Indicators | Conventional ventilation system | Heat recovery system | Improvement |
Heating Energy Consumption (kWh/m2) | 120 | ≤15 | 87.5% |
Cooling Energy Consumption (kWh/m2) | 95 | ≤15 | 84.2% |
Annual Operating Cost (yuan/m2) | 45 | 8 | 82% |
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