PE Mechanical Thermal Fluids case studies
PE Mechanical Thermal Fluids · Put your knowledge to work in context.
The PE Mechanical: Thermal and Fluid Systems exam is one of three NCEES PE Mechanical discipline exams, alongside HVAC and Refrigeration and Machine Design and Materials. It is a computer-based, closed-book exam administered year-round at NCEES-approved Pearson test centers. The PE Mechanical Thermal Fluids case studies are 5 cases and about 4,760 words.
1Condensate Pump Cavitation After a Heat-Recovery Retrofit
An atmospheric condensate receiver at a food plant serves a 200 gpm centrifugal pump. The pump was selected three years ago, when condensate entered the receiver at 180°F; a heat-recovery project now returns it at 205°F.
880 words, about 4 min2Lube-Oil Cooler Shortfall: Fouling, Plugged Tubes, or Water Flow?
A shell-and-tube lube-oil cooler is specified to cool 120 gpm of oil (SG 0.87, cp 0.45 Btu/lb·°F) from 150°F to 120°F using 70 gpm of cooling water entering at 85°F. The unit is 1-2 pass with F = 0.93, 295 ft² of area, a clean overall coefficient of 65 Btu/h·ft²·°F, and a design fouling allowance of 0.0015 h·ft²·°F/Btu.
911 words, about 5 min3Steam Coil That Only Heats on Mild Days
An air handler serving a paint booth uses a 15 psig saturated steam coil to heat 12,000 scfm of outdoor air from 40°F to 90°F. The site is near sea level.
986 words, about 5 min4Fan and Filter Upgrade: Can the 15 hp Motor Hold Design Airflow?
A constant-volume air handler delivers 20,000 cfm at 4.0 in. total static with the supply fan at 60 Hz.
948 words, about 5 min5Cooling Tower Delivering 87°F Cold Water at a 74°F Wet Bulb
A two-cell induced-draft cooling tower serves a chiller condenser water loop. Design conditions are 3,000 gpm circulating, 95°F water in, 85°F water out, 78°F design wet bulb, and 7°F design approach, with both fans at full speed.
1,035 words, about 5 min