Open Loop - Air Cycle Cooler

Air Cycle

By applying power and rotating the driveshaft, atmospheric air is continually drawn into the inlet port. The architecture consists of a volumetric offset within the upper & lower half of the device.

A larger volume of air being extracted from discharge compared with a smaller volume being introduced at the inlet leads to a continual low pressure across the pipework. Due to the low pressure, the temperature of the pipework fluid is also very low, allowing the capability of heat transfer for AC cooling.

As such, a heat exchanger passes hot fluid across the cold air steam, lowering its temperature to be used for AC.

The FeTu air cycle construct is completely scalable therefore the size can be tuned to meet a customers cooling capacity needs. The volume capacity of the device increases by the cubed of its radius, therefore it is possible to have a large volume device at compact sizes.

FeTu engineers, Wilde analysis and Brunel University have verified the cooling capability and COP of the air cycle system with calculations and 1D analysis. The data collected is to be verified by upcoming tests.

Brunel University COP vs speed over a range of heat inputs for a 120mm diameter, Volume Ratio: 1.46.
This shows the high efficiency of the FeTu air cycle concept.


Wilde Analysis plot on how the temperature of a charge of air is affected within the FeTu device. In ideal adiabatic conditions, the temperature differential can reach 40 °C  from ambient conditions.


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