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GB 55015-2021 "General Code for Energy Efficiency and Renewable Energy Application in Buildings" has been implemented since April 1, 2022, setting out clear energy-efficiency requirements for the building envelope, HVAC systems, lighting systems, and renewable-energy application of new buildings, expansions, and renovations. At the HVAC system level, the code requires heat recovery for fresh-air systems where conditions permit, and specifies limit values and recommended requirements for heat-recovery efficiency.

Rotor has completed the next-generation product iteration of its rotary heat-recovery units. The new generation achieves simultaneous optimization of heat-recovery efficiency and system pressure drop, reducing overall operating energy consumption by approximately 25% compared with the previous generation under the same fresh-air treatment volume. The unit uses an improved sealing structure and high-performance adsorbent materials, with simultaneous improvement of sensible and latent efficiencies, and maintains low long-term leakage rates.

The working principle of rotary heat recovery is to use the porous adsorbent material on the surface of the adsorption wheel to absorb waste cooling/heating in the exhaust-air sector and transfer the absorbed cooling/heating to the fresh air in the fresh-air sector. The wheel rotates at low speed to achieve continuous heat recovery. Compared with plate-type sensible heat exchangers, rotary heat recovery can simultaneously recover sensible and latent heat, making it particularly suitable for exhaust-air waste heat/moisture recovery in hospitals, operating rooms, electronics factories, pharmaceutical workshops, and data centres with high moisture or high enthalpy loads.

The technical highlights of this series include: the adsorption wheel uses an improved sealing structure, with improved sealing between the wheel and the casing and the wheel partition, maintaining low long-term leakage rates; the adsorbent material uses high-performance silica-gel/molecular-sieve composite materials, with simultaneous improvement of sensible and latent efficiencies; the drive uses either belt or direct-drive, with stable operation and easy maintenance; the control section supports both fixed- and variable-speed modes, and can automatically adjust rotor speed and fresh-air/exhaust-air damper openings based on indoor/outdoor temperature/humidity and fresh-air demand.

This series is suitable for exhaust-air waste heat/moisture recovery applications in hospitals, operating rooms, electronics factories, pharmaceutical workshops, and data centres with large airflow volumes and high requirements, in compliance with the recommended requirements for heat recovery in GB 55015-2021.