The Passive House (Passivhaus) standard — from the Passive House Institute (PHI) in Darmstadt — is the most demanding envelope-and-services benchmark in buildings, and continuous ventilation with heat recovery is mandatory. This article covers the recovery requirements and how they compare with code minimums.
Core Recovery Requirement
| Metric | PHI limit |
|---|---|
| Sensible heat recovery efficiency (HRV/ERV) | ≥ 75% (most certified units exceed 80–90%) |
| Specific fan power | ≤ 0.45 Wh/m³ (≤ 0.765 W/CFM) |
| Airtightness (new build) | n50 ≤ 0.6 h−1 at ±50 Pa |
| Heating demand | ≤ 15 kWh/m²/year, or peak ≤ 10 W/m² |
An airtight envelope makes mechanical ventilation unavoidable for IAQ, and the 75% floor means incoming air is pre-conditioned to within a few degrees of indoor temperature — fresh air with minimal energy penalty. A summer bypass lets the core be skipped in mild weather.
EnerPHit (Retrofit)
The PHI retrofit pathway, EnerPHit, relaxes the envelope but keeps recovery strict:
- Heating demand ≤ 25 kWh/m²/year (or airtightness ≤ 1.0 ACH50).
- Minimum heat recovery efficiency ≥ 75% (UK climate-specific tables set 75–80% depending on zone).
- Triple-glazed windows (U ≤ 0.80 W/m²K) and minimal thermal bridging.
PHI vs PHIUS+
In North America, PHIUS+ (Chicago) offers climate-specific targets (CORE, ZERO, REVIVE families) optimized for carbon and cost per climate zone, using a different energy model. Both certify buildings, designers, and components independently.
How It Stacks Against Codes
A 75% Passive House floor is far above the ASHRAE 90.1 50% minimum および EU Ecodesign 73% equipment threshold — though Ecodesign measures thermal efficiency (ηt) while PHI measures sensible. For critical ventilation, a non-rotating membrane core can meet the sensible floor without cross-contamination; a wheel does too but needs the frost and leakage care in wheel troubleshooting. See the enthalpy vs membrane comparison for the device trade-off.
よくある質問
What recovery efficiency does Passive House require?
At least 75% sensible heat recovery, with most certified units exceeding 80 to 90%, and specific fan power at or below 0.45 Wh per cubic meter.
Why is recovery mandatory in Passive House?
The envelope is so airtight that mechanical ventilation is required for indoor air quality, and the 75% floor pre-conditions incoming air with minimal energy penalty.
What is EnerPHit?
The PHI retrofit pathway, which relaxes the envelope but keeps recovery strict at 75% or more and adds airtightness and window requirements.
How does PHI compare with PHIUS+?
PHIUS+ in North America uses climate-specific targets and a different energy model, while both certify buildings and components independently.
よくある質問
What recovery efficiency does Passive House require?
At least 75% sensible heat recovery, with most certified units exceeding 80 to 90%, and specific fan power at or below 0.45 Wh per cubic meter.
Why is recovery mandatory in Passive House?
The envelope is so airtight that mechanical ventilation is required for indoor air quality, and the 75% floor pre-conditions incoming air with minimal energy penalty.
What is EnerPHit?
The PHI retrofit pathway, which relaxes the envelope but keeps recovery strict at 75% or more and adds airtightness and window requirements.
How does PHI compare with PHIUS+?
PHIUS+ in North America uses climate-specific targets and a different energy model, while both certify buildings and components independently.
適切な熱交換器を選定
当社のエンジニアが風量、温度、圧力損失の予算に合わせてコアを設計し、用途に応じて板式・回転式・ヒートパイプ回収を選定します。以下をお読みください： 熱交換器ガイド 、または仕様についてお問い合わせください。
関連製品
HVAC および換気向けの板式・回転式・ヒートパイプ回収。
空気と液体用の大表面積固定コア。
大風量向け高効率エネルギー回収。
清浄用途向けの受動的・完全分離流。