Airports & Transportation Terminals
Air-to-air energy recovery captures energy from the terminal's exhaust to pre-condition incoming outdoor air, and it pairs naturally with the dedicated-outdoor-air and displacement-ventilation strategies now common in terminal design.
Built for Continuous Ventilation Demands
Cut HVAC energy in vast, 24/7, high-occupancy public spaces — while keeping fresh air flowing for every traveler.
Airport terminals are among the most demanding buildings in commercial HVAC. They are enormous, high-ceilinged, and heavily glazed; they operate 24/7 with dramatic, occupancy-driven load swings as flights surge and empty; and they must ventilate very high densities of people. A Conditioning the large volumes of outdoor air these crowds require is a major, continuous cost.
Air-to-air energy recovery captures energy from the terminal’s exhaust to pre-condition incoming outdoor air, and it pairs naturally with the dedicated-outdoor-air and displacement-ventilation strategies now common in terminal design. Innergy tech manufactures AHRI-certified energy recovery wheels, sensible and enthalpy plate exchangers, and heat pipes – so the recovery technology can be matched to each terminal space, from the main concourse to baggage handling, and to the airstream-separation concerns that come with an active airfield.
Big Volumes, Big Crowds, Never Closed
HVAC Dominates Terminal Energy
Airport terminals have unique energy demands due to large-scale operations, continuous 24/7 activity, and diverse functional requirements. Review findings consistently identify HVAC as one of the largest shares of total terminal energy consumption. Case studies have documented significant HVAC energy reductions from control and scheduling optimization alone — underscoring how much energy these systems move. Recovering exhaust energy attacks the largest single end use.
High, Variable Occupancy
Concourses, holdrooms, security, and baggage claim swing from empty to packed as flights arrive and depart, so ventilation loads are large and highly dynamic. Research and design references note that high passenger densities frequently drive CO₂ above recommended thresholds when ventilation is inadequate. Meeting ASHRAE 62.1 outdoor-air rates for dense assembly occupancy — and often exceeding them for comfort and IAQ — is a defining load.
Vast, Glazed, High-Ceilinged Volumes
Modern terminals feature expansive glass curtain walls and clerestories for daylight and views, which add solar load and stratification challenges in tall spaces. Designers increasingly use displacement ventilation — supplying conditioned air low, at occupant level, and returning warm air high — which can reduce required airflow and outdoor air. Energy recovery complements these strategies.
24/7 Operation
Terminals never close, so ventilation energy is a round-the-clock cost and recovery pays back continuously. This also raises the value of reliable, low-maintenance recovery devices.
Airfield Emissions and Air Intakes
Aprons and taxiways expose the building’s outdoor-air intakes to jet-engine and ground-vehicle emissions — volatile organic compounds and particulate similar to diesel exhaust. The primary design responses are careful intake location and height and appropriate filtration. Where a terminal exhaust stream is undesirable to recirculate, physically separated recovery devices are preferred. (Energy recovery is selected around these measures — it is not an air-cleaning device.)
One Manufacturer, Four Recovery Technologies
Innergy Tech is a comprehensive air-to-air energy recovery manufacturer offering energy recovery wheels, sensible and enthalpy plate exchangers, and heat pipes (source: innergytech.com). A terminal contains a wide range of space types, and this breadth lets the device be matched to each:
- Energy Recovery Wheels (I4, I4R, I4-D): Rotary wheels for the highest total-energy (sensible + latent) recovery – the workhorse for large concourse, holdroom, and public-hall DOAS with clean return air. The I4R field-installed sectional wheel suits large or retrofit terminal AHUs; the I4-D is a passive dehumidification wheel for humid climates.
- Enthalpy Plate Exchangers (IPE6-PM): Total-energy fixed-plate exchangers with a polymer washable membrane and no moving parts – a low-maintenance option with low cross-leakage for terminal ventilation.
- Sensible Plate Exchangers: Fixed-plate, sensible-only recovery with separated airstreams and no moving parts – for cold/dry climates or where moisture transfer is not wanted.
- Heat Pipes (Thermogain): Passive thermosiphon devices with no moving parts and physically separated airstreams – the appropriate choice for terminal exhaust streams that should not be recirculated (e.g., certain baggage, apron-adjacent, or vehicle-tunnel exhausts), and a compact, low-maintenance option elsewhere. A U-shaped configuration is offered for dehumidification.
Scale, Corrosion, and Retrofit
Terminals need large airflows; field-installed sectional wheels (I4R) ease handling and installation in big AHUs and renovations. For coastal airports, epoxy-coated media/frame options support corrosion resistance.
Recovery Technology Fit
Benefits & Value Drivers
Attacks a Major Ventilation Energy Load
Airports require large volumes of outdoor air to support passenger comfort and indoor air quality. Energy recovery helps reduce the heating and cooling energy required to condition that air, lowering overall operating costs.
Supports Comfortable Terminal Environments
Energy recovery makes it more practical to provide the ventilation rates busy terminals require while maintaining comfortable indoor conditions throughout concourses, gate areas, and public spaces.
Humidity Moderation
Enthalpy-based energy recovery solutions help transfer both heat and moisture, supporting humidity management in large glazed terminal spaces. Additional passive dehumidification and heat pipe options are available for applications with greater humidity control needs.
Separated-Airstream Options
For applications where exhaust air should remain completely separated from incoming outdoor air, heat pipes and plate heat exchangers provide energy recovery without mixing airstreams.
Whole-Terminal Technology Match
With energy recovery wheels, plate heat exchangers, heat pipes, and dehumidification solutions, Innergy tech can support a wide range of airport spaces, from concourses and baggage handling areas to food service and operations facilities.
Performance-Focused Solutions
Advanced selection and design support help engineers identify the right energy recovery technology for each application, supporting energy efficiency goals while maintaining ventilation requirements.
Designing Energy Recovery for a Terminal Project?
Our team can help match recovery technology to each terminal space and provide AHRI-certified performance data for your energy model and submittal.