Reviewer
Luis Arroyo
EPA 608 Universal, RSES CMS, refrigeration specialist
Luis works as a refrigeration specialist on commercial and supermarket systems. He holds EPA Section 608 Universal certification (the federal credential required to service all refrigerant equipment classes under 40 CFR Part 82 Subpart F, earned by passing the proctored Core exam plus Type I, II, and III specialty exams) and the RSES Certificate Member Specialist credential in Commercial Refrigeration. The CMS designation from the Refrigeration Service Engineers Society requires first passing the 18-category Certificate Member exam, then passing the specialty exam in commercial refrigeration, and maintaining 90 continuing-education hours every five years through RSES-approved courses.
His day-to-day work is on rack systems running R-448A, R-449A, R-454B, R-32, and an increasing amount of CO2 transcritical equipment as supermarket chains phase out higher-GWP refrigerants under the AIM Act timeline. The math behind subcooling on a TXV-controlled medium-temp evaporator, refrigerant charge by line-set length on a long-line install, and low-side pressure-temperature correlation across a refrigerant glide is the math he uses on every diagnostic call. The tools on this site that touch refrigerant thermodynamics are the ones he checks against his service-truck reference cards.
Luis reviews the subcooling calculator and the refrigerant charge calculator. Both tools rely on saturation-temperature lookups and bubble-point versus dew-point distinctions for zeotropic blends like R-454B, which is exactly the math RSES tests on the commercial refrigeration specialist exam.
Tools reviewed by Luis
Every tool listed below was reviewed by Luis Arroyo against the published code, standard, or manufacturer data it implements. Luis signs off on the math, the inputs that drive it, and the edge cases the result panel flags.
Refrigerant
How BTU Size uses reviewers
Every tool on BTU Size credits a named technician with field experience in the relevant trade. Reviewers check the math against published code (ACCA, ASHRAE, NEC, NFPA, IECC), against manufacturer engineering data (Carrier, Trane, Mitsubishi, Owens Corning, Slant/Fin), and against the edge cases that show up on real service calls. See the full reviewer roster and methodology.