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With the implementation of GB 55015-2021 "General Code for Energy Efficiency and Renewable Energy Application in Buildings," an increasing number of new and retrofit projects are considering the configuration of heat-recovery equipment in the design stage of their fresh-air systems, in order to reduce fresh-air loads, decrease cooling/heating-source installed capacity, and lower operating energy consumption.

Rotor has recently launched a new total-heat-exchanger product series, using selective permeation membrane material and an inverse-flow heat-exchange structure, achieving a heat-recovery efficiency of over 70% (according to the GB/T 21087 test condition). Compared with traditional plate-type sensible heat exchangers that can only recover sensible heat, total heat exchangers can simultaneously recover sensible and latent heat, making them particularly suitable for fresh-air systems in hot-summer/cold-winter and hot-summer/warm-winter regions. The unit has a compact structure and low leakage rate, suitable for installation in suspended ceilings, equipment rooms, or vertical air-conditioning units, applicable to fresh-air systems with energy-efficiency requirements in offices, shopping malls, hospitals, schools, and hotels.

The working principle of the total heat exchanger is to use selective permeation membrane material to perform moisture and heat exchange between fresh air and exhaust air. Fresh air and exhaust air transfer moisture and heat through both sides of the membrane material without direct contact, avoiding cross-contamination. Rotor's new total heat exchanger uses an inverse-flow heat-exchange structure, with fresh air and exhaust air flowing countercurrently on both sides of the membrane, further improving heat-recovery efficiency.

The technical highlights of this series include: the selective permeation membrane material has high moisture permeability and air tightness, maintaining stable long-term moisture-recovery efficiency; the inverse-flow heat-exchange structure allows fresh air and exhaust air to flow countercurrently on both sides of the membrane, significantly improving heat-recovery efficiency; the unit cabinet uses aluminum-alloy or stainless-steel frames and polyurethane double-layer panels, with low leakage rate and good insulation performance; the unit specifications cover a wide range of airflow volumes, allowing flexible interfacing with different fresh-air system designs; filter sections and silencing sections can be configured as required.

GB 55015-2021 has clear mandatory and recommended provisions for building energy efficiency. Rotor's new total-heat-exchanger units can help new and retrofit projects reduce fresh-air loads, decrease cooling/heating-source installed capacity, and lower operating energy consumption, in compliance with the code's recommended requirements for heat recovery.