Transcription of Package DX Units: Performance Optimization & Field Tests
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Package DX Units: Performance Optimization & Field Tests
Package DX Units: Performance Optimization & Field TestsMichael West, PhD, PEAdvantek Consulting Engineering, POWERED :: CLIENT DRIVENU nitary equipment is ubiquitous. 60% of US commercial space is cooled with RTUs (DOE) 54% of commercial building cooling primary energy consumption (EIA) Total annual installations over 300,000 units Estimated million legacy units operating at low efficiency levels100,000 units at DoD facilities / 20,000 buildings100,000 units at USPS facilities / 30,000 buildings500,000 units at 65,000 big box retail storesRTU Rooftop packaged air-conditioner UnitDOE Department of EnergyEIA Energy Information AdministrationUSPS United States Postal ServiceBackgroundROOFTOPPORTABLE PAD MOUNTSPLIT SYSTEM How much cooling you get for the electricity it uses Btuh per Watt (MBH per kW) EER Energy Efficiency RatioFull Load @95F Ambient IEER Integrated Energy Efficiency RatioWeighted Full Load & Part Load @95, , 68, and 65F SEER Seasonal EER Part Load @82F Ambient x Performance Load Factor IPLV Integrated Part-load ValueLegacy rating (no longer standard)
Improvement of evaporator refrigerant / two-phase heat transfer. Increased suction density improves compressor volumetric efficiency. Variable sensible heat ratio optimizes airside performance. REFRIGERANT CIRCUIT COIL HEAT TRANSFER TXV –Thermostatic Expansion Valve Modified DX Cycle
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