Those small-diameter coils — with names like MicroGroove, microchannel, and micro-multichannel — have gained a beachhead in residential heating and air conditioning, and are advancing in commercial HVAC, with refrigeration on the horizon.
The refrigeration destination may, more often than not, currently be in the computer-modeling stage but real-world applications are starting to arrive. It is just a matter of completing the fine-tuning on the a/c side before venturing into refrigeration equipment to an even greater extent.