Originally posted by markfiddy
So jay asked why do TEV cabinets work better than capillary on fluctuations in ambient temperatures

On capillary a change in load or condensing temperature has a effect on pumping capacity and flow rate in the capillary.Leading to changes in case temperarure.

The TEV with MOP limits flow at a predetermined rate therefore limiting condensing pressures and keeping refrigerated case temperatures down.Thats the fundamentals.
Actually, the TEV is able to respond to changes in load, while the cap tube system is not. The cap tube is designed for a given set of conditions and changes in load or condensing temperature have very little effect.