Four basic processes
On the psychrometric chart, ventilation air moves along predictable lines:
- Heating: horizontal line to the right (dry-bulb up, moisture constant).
- Sensible cooling: horizontal line to the left (dry-bulb down, moisture constant).
- Humidification: line upward (more moisture).
- Dehumidification: line downward (condensation, latent heat released).
Sensible recovery = a move along the constant-humidity line
A プレートコア pre-heats or pre-cools the supply along a constant-humidity path: dry-bulb temperature changes, moisture does not. It is the simplest, cleanest recovery for separated airstreams.
Total-energy recovery = a move toward the exhaust state
A rotary enthalpy wheel or membrane pulls the supply state toward the exhaust state in both temperature and humidity. In winter, cold dry outdoor air approaches the warmer, more humid exhaust – picking up sensible and latent energy and cutting both heating and humidification load.
Where frost enters the picture
When exhaust falls below its dew point and frost point, moisture deposits as ice on the core. This is why cold-climate designs need defrost strategy, not just a bigger wheel.
Frequently asked questions
Does recovery change indoor RH? Sensible-only recovery does not; total-energy recovery can steady indoor humidity because it transfers moisture too.
Which process saves more energy in summer? In humid summers, the dehumidification (downward) leg of total recovery relieves the cooling coil most.
Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team – WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.
よくある質問
How does a heat recovery process appear on the chart?
Sensible recovery moves a state horizontally (temperature change, same moisture); enthalpy recovery moves it along a line blending both temperature and moisture toward the supply state.
Why do cooling and recovery processes often combine on the chart?
Precooling the exhaust with incoming air lowers the wet-bulb the cooling coil must handle, shrinking coil load and sometimes letting a smaller coil meet the setpoint.
よくある質問
How does a heat recovery process appear on the chart?
Sensible recovery moves a state horizontally (temperature change, same moisture); enthalpy recovery moves it along a line blending both temperature and moisture toward the supply state.
Why do cooling and recovery processes often combine on the chart?
Precooling the exhaust with incoming air lowers the wet-bulb the cooling coil must handle, shrinking coil load and sometimes letting a smaller coil meet the setpoint.
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。