Reversing Regenerator (RG)

Reversing Regenerator (RG)
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ECE RG units can be used in almost all buildings, but are particularly suitable for those with high constant heat and or humidity gains, high occupation density and high ventilation needs.

Heat Recovery Efficiency

The correct efficiency is a subjective decision and depends on the economic calculation and written guidelines, i.e. Ecodesign Commission Regulation (EU) No 1253/2014, on operating data such as energy prices, useful life, running times, temperatures, maintenance costs and interest rates. With regard to (EU) No 1253/2014, profitability and environmental protection the heat recovery efficiency should be no less than 73%

Dependent on the right conditions heat recovery efficiencies can reach 95%

ECE RG units can be used in almost all buildings, but are particularly suitable for those with high constant heat and or humidity gains, high occupation density and high ventilation needs such as:- Hotels, Corporate, High End Housing, Sports & Leisure, Education, Offices, Industrial, Data centre and Health.


RG air handlers are configured either in a side-by-side or stacked configuration. The RG units perform all the functions required of an environmental control system by simply extracting and supplying air and moving two pairs of dampers. This rapid movement is effected by inverter driven actuators. The very high recovery efficiency of ECE RG units means that the basic unit can also be used as "add on" ventilation to existing buildings or systems without adding to, overloading or replacing existing heating plant and providing a small load margin exists.

From this process the specific heat output capacity depends on the temperature difference between the two air streams. Hence the reversing regenerator is suitable for heat as well as cool recovery, i.e. for winter and summer operation.

As a general rule if in winter the internal total gains always exceed the fabric losses by 10% of the fresh air load then no mechanical heating is needed.

Ancillary Items

Air filtration is always present in order to provide clean dust-free air to the building occupants.

Direct heating, placed directly in the air stream, are direct heat exchangers and include those for gas-fired fuel-burning heaters or electric air heater batteries (EAHB).

Indirect Heating and Cooling coils use hot water or steam for heating, and chilled water for cooling. Heat pumps can be used as well. (Prime energy for heating and cooling is provided by central plant).

Humidification is often necessary in colder climates where continuous heating will make the air drier, resulting in uncomfortable air quality and increased static electricity. Various types of humidification may be used as part of our air handler and include evaporative, vaporizer, spray mist and wetted medium.

If dehumidification is required, then the cooling coil is employed to over-cool so that the dew point is reached and condensation occurs. A heater coil placed after the cooling coil re-heats the air to the desired supply temperature and humidity level. This is often used for chilled beam applications. 

Smart Control System

ECE Smart Control System comes as a standard and monitors the return air quality, energy available to recover and CO2 concentration for optimum energy efficiency whilst maintaining desired fresh air requirements. Additionally, when outside air conditions are such, typically mid-season weather conditions, it may be that ambient temperatures are suitable for free cooling purposes. Where fresh air is not required, such as early morning pre heat or pre conditioning periods, the dampers can be automatically set to full recirculation, again for optimum energy efficiency.


Our complete range of AHUs can be tailor made to suit all customer requirements including direct & indrect heating, cooling, heat pumps, controls and refrigeration.

Air volume ranges from 0.31m3/s to 13.2m3/s.