Integrated Energy Recovery Make-Up Air Units

PowerFX

The PowerFX system is designed to recover the available energy from a hot air vent duct of a building. It uses this energy to preheat the fresh air of an Airex AMX Series air make-up, or any other air make-up unit.

The lack of fresh air can be a problem in an industrial building. Air make-up units, such as the AMX, are installed in these buildings to solve this problem. However, in situations that require a large volume of fresh air, these units can become energy-consuming, especially if they are used to heat the building. With the PowerFX, the exhaust air energy released to the atmosphere can be recovered. This energy is then returned to the air make-up unit.

How it Work

Firstly, an energy recovery coil should be installed in the air evacuation duct of the building, ideally of similar capacity (same air flow). The coil absorbs energy that would otherwise be released to the atmosphere. A refrigerant loop carries the captured energy to a compressor which is installed in the air make-up unit. The compressor operates under the principle of heat pumps. It releases a high temperature fluid from a low temperature source. This high temperature fluid is used to preheat the fresh air before it is fed into the building.

REDUCE YOUR AIRBORNE CONTAMINANTS RELEASED TO THE ATMOSPHERE

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Standard Characteristics

Horizontal roof exhauster
Direct expansion energy recovery thermal coil
Direct expansion heating coil
Refrigerant loop
Heat pump type compressor
Multistage compressor to avoid frequent starts / stops.
Reversible valve to enable dehumidification in summer
CSA approved Control Panel
Electric heating coil (optional)

Selection Criteria

Air make-up system air flow
Air flow from the exhaust related to the PowerFX
total heating capacity Percentage to be supported by a PowerFX

Applications

Commercial kitchens
Laboratories
Indoor parkings
Mechanical workshops
Offices
Schools
Industrial buildings
Residential buildings

Advantages

Energy recovery from hot air exhausts.
Decrease in electric peak for electric air make-up.
Greenhouse gases emissions decrease for natural gas air stabilizer unit (direct or indirect fire).
Heating costs reduced by over 60%.
the reversible valve allows to cool and dehumidify the fresh air in summer .
Increase of the compressor efficiency with an outdoor air temperature decrease, unlike other typical heat pumps applications.
Installation does not require additional ductwork.
AMX air make-up units already have the physical characteristics to easily accommodate a PowerFX system.
The PowerFX system is factory pre-assembled for easy and fast installation in case of existing air make-up units.
The PowerFX system can be connected to a thermal storage bank.

Specifications

integrated energy recovery makeup air units schematic

Technical Data
Air flow	10000 CFM
Compressor capacity	25 tonnes
Supply temperature	65 °F
Exhaust temperature	> 70 °F
Operating hours	24hres/7days
Unit localisation	Montreal
Natural gas rate	0.45$/m³
Electricity rate	0.068$/kWh

	Type Of Air Make-up Unit
	Direct Fire	Indirect Fire	Electric Heater
Annual heating consumption	59 715 m³	79 620 m³	628 300 kWh
Annual heating cost	26 870 $	35 828 $	42 725 $
Equivalent consumption recovered with PowerFX*	39500 m³	54 767 m³	415 615 kWh
Annual saving with a Power FX installed*	16 100 $	22 971 $	28 260 $
PowerFX energy savings percentage	60%	64%	66%