I am trying to design and build a mini chiller for a school engineering project. The chiller would have a small cooling compartment enough to fit a few cans.

My problem is that I don't know how to pick a compressor. I need to be able to achieve subzero temperatures in a short period of time.

I know so far that I will need a low back pressure, 115v 60hz, r134a compressor. I just do not know how much power I will need. Any input would be appreciated, thanks everyone