Energy recovery air purifier

Commercial Total Heat Recovery Units for Medium and Large Airflows

Where a packaged fresh air ventilator is not large enough, the project moves to a total heat recovery unit: a bigger cabinet with the same recovery principle and more airflow. ROTER's commercial total heat exchanger range covers three installations, each aimed at a different building type.

Medium ceiling-mounted heat recovery unit

The medium ceiling-mounted heat recovery unit handles an airflow range of 1,500 to 15,000 m³/h. It is applicable to KTV venues, internet cafes, hotels, shopping malls, factories, office buildings, restaurants, banks, classrooms, kindergartens, hospital wards and similar locations. Because the unit is mounted in the ceiling, it leaves the floor area completely free, which is what makes it the usual choice for retrofit work in an occupied building.

Medium ceiling-mounted total heat recovery unit

The medium ceiling-mounted total heat recovery unit covers an airflow range of 1,000 to 15,000 m³/h, suitable for hotels, guest rooms, small meeting rooms, residential dwellings and similar applications. Again the machine is placed in the ceiling so that it does not occupy the usable floor area. Unlike the heat recovery unit above, this model performs total heat exchange, so it recovers moisture as well as sensible heat.

Vertical total heat recovery unit

The vertical total heat recovery unit is suited to underground garages, large supermarkets, swimming pools, shopping malls, office buildings, restaurants and similar places. The unit adopts a floor-standing installation and can be placed in an equipment room, which suits spaces where there is no ceiling void to work in, such as a basement car park.

Which of the three fits the project

What a total heat recovery unit does for running costs

The unit pre-conditions the incoming fresh air to a temperature close to the indoor temperature, which significantly reduces the air conditioning load downstream. The 200 m² room case in the ROTER manual shows supply air at about 28°C where ordinary ventilation would deliver 7°C, saving approximately 1,112 kWh in winter and 1,427 kWh in summer, roughly 42.3% annually at 0.48 CNY per kWh. Because the load on the air conditioning equipment is reduced, the equipment cost may also be lowered accordingly.

Information needed for a quotation

• The design airflow and the space it serves, including the ceiling height or the plant room constraints for the vertical unit.
• Whether the duty is sensible heat recovery or total heat recovery, and whether the exhaust stream is clean or industrial.
• Noise limits at the occupied position and the available maintenance access.
• Any filtration requirement beyond the standard core, such as particulate removal in a hospital or workshop environment.