Here is a link to a site that explains the concept of how to read a chart. Their example is using R404A; however, the basic principles of reading a PH chart are the same. Assuming you have a R134A chart, you need only apply the principles to your chart.
http://www.alephzero.co.uk/ref/circeff.htm
Another site that may be helpful. This one is using a 134A chart for their example.
http://www.achrnews.com/Articles/Feature_Article/84c33b478be5a010VgnVCM100000f932a8c0____
I hope you find this information helpful to you. Good Luck in your endeavor! :-)
COP of a refrigarator
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