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Air to Air Heat Exchangers

Our Air to Air Heat Exchangers have a closed loop cooling system which employs the heat recovery ventilation system to exchange heat from an electrical enclosure to the outside.

In applications where ambient temperatures are suitable for heat pipes, an A2A heat exchanger is the most efficient method of cooling, the waste heat is the engine which drives the system.

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Available Models

ModelWatts
°F/°C
Voltage/HzRunning AmpsMax Ambient
Temperature
Mounting Dimensions
H x W x D
A2AC0401206/11120 50/60.37160°F16.5" x 11" x 3.5"
A2AC0402306/11230 50/60.18160°F16.5" x 11" x 3.5"
A2AC040D246/1124VDC.80160°F16.5" x 11" x 3.5"
A2AC040D486/1148VDC.40160°F16.5" x 11" x 3.5"
A2AC08012012/22120 50/60.37160°F16.5" x 11" x 3.5"
A2AC08023012/22230 50/60.18160°F16.5" x 11" x 3.5"
A2AC080D2412/2224VDC.80160°F16.5" x 11" x 3.5"

Product Downloads

Product Drawings
PDF | CAD

Product Cutouts
PDF | CAD

Available Models

ModelWatts °F/°CVoltage/HzRunning AmpsMax Ambient TemperatureMounting Dimensions H x W x D
A2AD12012018/33120 50/60.37160°F16.5" x 11" x 5.5"
A2AD12023018/33230 50/60.18160°F16.5" x 11" x 5.5"
A2AD120D2418/3324VDC.80160°F16.5" x 11" x 5.5"
A2AD120D4818/3348VDC.40160°F16.5" x 11" x 5.5"
A2AD16012024/44120 50/60.37160°F16.5" x 11" x 5.5"
A2AD16023024/44230 50/60.18160°F16.5" x 11" x 5.5"
A2AD160D2424/4424VDC.80160°F16.5" x 11" x 5.5"
A2AD160D4824/4448VDC.40160°F16.5" x 11" x 5.5"

Product Downloads

Product Drawings
PDF | CAD

Product Cutouts
PDF | CAD

Available Models

ModelWatts °F/°CVoltage/HzRunning AmpsMax Ambient TemperatureMounting Dimensions H x W x D
A2AT26012040/71.6120 50/60.47160°F29" x 13.88 x 5.5"
A2AT26023040/71.6230 50/60.243160°F29" x 13.88 x 5.5"
A2AT260D2440/71.624VDC1.94160°F29" x 13.88 x 5.5"
A2AT260D4840/71.648VDC.928160°F29" x 13.88 x 5.5"
A2AT20012031/55120 50/60.47160°F29" x 13.88 x 5.5"
A2AT20023031/55230 50/60.243160°F29" x 13.88 x 5.5"
A2AT200D2431/5524VDC1.94160°F29" x 13.88 x 5.5"
A2AT200D4831/5548VDC.928160°F29" x 13.88 x 5.5"

Product Downloads

Product Drawings
PDF | CAD

Product Cutouts
PDF | CAD

Features:

  • All units are available in NEMA Type 12, 4 and 4X
  • Hazardous Location (Class 1, Div 2, Groups B, C, D) configuration available for all units
  • Closed Loop & Filterless Operation
  • Full use of insulation to preserve the cold fraction
  • Deliberate use of physical isolation of coil from casing where we want to transfer heat
  • Deliberate use of contact between coil and casing for another increment of heat transfer to the enclosure environment
  • Available in 120VAC, 230VAC, 24VDC, 48 VDC

DownloadAir to Air Heat Exchanger Brochure
DownloadHeat Exchangers VS Filtered Fans
DownloadA2A Installation & Operations Manual

Heat pipes have a liquid refrigerant under a partial vacuum inside sealed tubes. They operate with a phase change process which is much like that of mechanical air conditioning, but without the compressor. Each heat pipe has an evaporator section and a condenser section which are separated by a permanent baffle to provide a closed loop.

The bottom of each heat pipe is in contact with heated air from the electrical enclosure. When the enclosure air reaches approximately 75 degrees Fahrenheit, the refrigerant changes to vapor phase (boils) and the vapor (steam) rises to the top of the tube which is in contact with cooler outside (ambient) air. When the outside air temperature is lower than the enclosure temperature, the refrigerant vapor gives up heat to the outside air and returns to the liquid phase. It then falls to the bottom and repeats  A2A Heat Exchangers Heat In Heat Out Diagram 300x181 300x181the cycle endlessly so long as there is a negative temperature differential between the enclosure and outside. Heat pipes will not operate in reverse cycle so heat cannot be transferred from the ambient to the interior of the enclosure.

Our design has a top-to-bottom enclosure air flow pattern with maximum separation of the inlet and outlet. This design pulls the hottest air from the top of the enclosure and returns the cooled air from the bottom of the heat pipe to the enclosure. The airflow on the ambient side is bottom in, top out, so that the hotter discharge air moves up and away rather than being recirculated.

As with all of our coil systems, we use aluminum end plates and baffles which improve conduction and reduce corrosion for longer life. The center aluminum baffle, which is swaged into the heat pipe coil, provides an airtight seal between the two air systems.

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