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Although pressure enthalpy is a more advanced topic, I introduce the concepts to my students during their very first semester at the college.
The seminar is organized so that the forst portion is a review of the basic refrigeration cycle, with emphasis placed on component function, superheat, subcooling and other goodies.
Once the basics have been discussed we move into pressure enthalpy on a conceptual level. This helps understand the workings of the system and not just how to put numbers into a formula.
The really neat thing about this seminar is that, no matter how much (or how little) experience you have, you will still walk away with a wealth of knowledge.
As far as a Boston area seminar goes, I have nothing planned as of yet, but I will contact you when we come to your area.
Hope to see you soon.