Dawson Company

Topic: Centralized Heat Pump Water Heater (CHPWH) System Design Considerations and New Sizing Techniques

Taught by Eric Decker, PE, CPD

Please come in at 8am for breakfast and class will begin promptly at 8:30.

PART 1: • Overview of heat pump refrigerantcycle • Discuss Minimum Lift and Water SideDeltaT • Current 3rd Party Testing Standards (Energy Star, DOE, AHRI Standard1300) • Typical refrigerants used for CHPWH • General design considerations

PART 2: • “Single-Pass” vs. “Multi-Pass” configurationvs. piping schematic • Peak and off-peak scenario hydronic analysis • General comments on “single-pass” vs.“multi-pass”, pro’s/cons • Electric Swing Tank vs. Electric Backup –hydronic analysis

PART 3: • General comments vs. gas-fired,ASPE Fixture Tables • CHPWH Sizing Methods-Peak/Off-Peak Sizing Method-Ecotope Sizing Method-CBECC-Res 2019 Sizing Method • Other Sizing Methods – ASHRAE LoadProfile • Sizing examples