Performance and Oil Retention Characteristics of a CO2 Heat Pump Water Heater

dc.contributor.advisorRadermacher, Reinhard Ken_US
dc.contributor.authorFernandez, Nicholas Edward Peteren_US
dc.contributor.departmentMechanical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.description.abstractA CO2 heat pump water heater (HPWH) was investigated experimentally and analytically. In the first stage of the study, a baseline performance was measured, investigating the effect of operating parameters on the system performance under typical tank heating scenarios. In the second, the CO2 HPWH was modeled to investigate the effect of optimizing key components. In the third, the oil retention mass, the increase in pressure drop, and the COP degradation were measured as a function of oil mass fraction. In the fourth, two alternative system configurations were investigated for potential performance enhancement; a two-stage compression cycle with internal heat exchanger and a system with a suction line heat exchanger. Overall, the CO2 cycle seems uniquely suited for water heating. CO2 HPWHs have enormous energy savings potential if the cooling from the evaporator can be harnessed during the summer months, and rejected to the environment during the colder months.en_US
dc.format.extent3766404 bytes
dc.subject.pqcontrolledEngineering, Mechanicalen_US
dc.subject.pqcontrolledEngineering, Environmentalen_US
dc.subject.pquncontrolledHeat pump water heateren_US
dc.subject.pquncontrolledinternal heat exchangeren_US
dc.subject.pquncontrolledOil Retentionen_US
dc.subject.pquncontrolledsuction line heat exchangeren_US
dc.titlePerformance and Oil Retention Characteristics of a CO2 Heat Pump Water Heateren_US


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