Performance and Oil Retention Characteristics of a Carbon Dioxide Heat Pump Water Heater

Performance and Oil Retention Characteristics of a Carbon Dioxide Heat Pump Water Heater

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A 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.The heat exchangers were provided by Modine, a heat exchanger manufacturer based in Wisconsin. Based on the size ... From that point, the CO2 is expanded in a manual needle-type expansion valve, and flows into the evaporator. The evaporator is ... The evaporator was installed in a wind tunnel inside the environmental chamber with a blower controlled by a variable frequency drive. From the outletanbsp;...


Title:Performance and Oil Retention Characteristics of a Carbon Dioxide Heat Pump Water Heater
Author: Nicholas Fernandez
Publisher:ProQuest - 2008
ISBN-13:

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