I am a mechanical engineering student at Purdue University. For our senior design project, we have to design a small refrigerator to cool workstation microchips. Anyway, I'm looking for how to design the capillary tube used for throttling. I've looked in the ASHREA handbook, but it only gives curves for R22 and some other refrigerant. We're using R134a. Any advice you could give would be appreciated. Thanks in advance.