HVAC Excellence Refrigeration case studies
HVAC Excellence Refrigeration · Put your knowledge to work in context.
HVAC Excellence is a set of HVACR education and workforce programs operated within ESCO Group, based in Mt. Its published materials describe standards and resources that strengthen the quality of education, training, credentialing, and workforce development across the HVACR and building science industries. Candidates encounter HVAC Excellence in two main ways: as students or technicians pursuing portable and stackable certifications offered at progressive career levels, and as instructors pursuing educator credentialing examinations that validate retained knowledge and pedagogical skills. ESCO Group's site also lists specialty credential areas such as A3 hydrocarbon refrigerant safety, low-GWP A2L mildly flammable refrigerant safety, system performance, R-410A, residential heat load analysis, duct and envelope testing, green awareness, and residential energy auditing, alongside EPA Section 608 and 609 resources and Employment Ready exams. The HVAC Excellence Refrigeration case studies are 5 cases and about 2,592 words.
1Liquid-to-Suction Heat Exchanger: Net Capacity vs. Discharge Temperature
A 1.5-ton R-404A freezer unit operates at a 20°F evaporator and 110°F condensing with a thermostatic expansion valve. The owner asks whether adding a liquid-to-suction heat exchanger will increase capacity enough to pull the box down faster.
582 words, about 3 min2R-22 to R-407C Retrofit: Glide, Oil, and Charging Method
A supermarket medium-temperature display case runs on R-22 with mineral oil and a TXV. The owner wants to convert to R-407C rather than replace the case.
544 words, about 3 min3Low-Ambient Head Pressure Control and Receiver Sizing
A 3 HP R-404A condensing unit serves a 35°F walk-in cooler in Minneapolis. Design conditions are 95°F ambient, 25°F evaporator, and 110°F condensing.
542 words, about 3 min4New R-410A System Commissioning: Charge, Superheat, and Vacuum
A new 10-ton R-410A split refrigeration system is being commissioned for a produce room. The line set is 80 ft of 1/2-inch liquid line and 1-5/8-inch suction, with a 25-ft vertical rise.
456 words, about 2 min5Reach-In Freezer Starving: Restriction vs. Undercharge vs. Weak Compressor
A reach-in freezer with a 1/2 HP R-404A condensing unit and a TXV is holding 18°F instead of 0°F. Ambient is 75°F and the condenser is clean.
468 words, about 2 min