DE HVAC case studies
DE HVAC · Put your knowledge to work in context.
This independent study page provides practice for DE HVAC. Its editorial learning areas include Refrigeration cycle, property references, and energy calculations; Compressor types, lubrication, capacity, and fault reasoning; Heat rejection, evaporators, secondary loops, and advanced systems; Operating controls, interlocks, instrumentation, and electrical basics; Refrigerant hazards, emergency response, and regulatory boundaries; Refrigerant properties, performance trends, and accountable operation; Air conditioning, airflow and accountable installation evidence; Delaware HVACR authority, scope and examination preparation. The DE HVAC case studies are 6 cases and about 1,188 words.
1Comparing compressor performance and plant performance
An operator is asked to compare two shifts of refrigeration performance. One spreadsheet divides cooling duty by compressor input only, while another includes the secondary pump and condenser fans.
210 words, about 1 min2Rising condenser pressure on a warm production day
A refrigeration plant is serving a higher production load during warm weather. The operator notes rising condenser pressure and a larger difference between the condensing temperature and the cooling-water outlet.
221 words, about 1 min3A control display appears normal after a shutdown
A chilled-water plant has stopped following a low-temperature alarm. The alarm has been acknowledged, and the operator sees a normal-looking temperature value on the building-management display.
221 words, about 1 min4A suspected ammonia release during a shift change
During handover, a refrigeration detector alarms near a machinery room using ammonia. A worker reports irritation but is not sure whether it comes from the room.
221 words, about 1 min5A cool supply-air reading hides incomplete commissioning
A fictional air-conditioning system has just been installed. The supply air feels cool and the controller shows a satisfied demand, so a contractor proposes signing off the complete installation.
154 words, under 1 min6A requested service exceeds the stated restricted category
A fictional Delaware business receives a customer request covering several HVACR services. The assigned professional holds a restricted category, but nobody has checked which parts of the proposed scope that category permits.
161 words, under 1 min