Abstract
Net-zero energy buildings are on the agenda of international community due to reducing energy consumption in the building, thus dropping carbon emissions and negative environmental effects. One of the solutions is to utilize heat pumps to decrease energy consumption in the building. In this study, the idea of ejector utilization in a heat pump system was investigated in an experimental test facility by comparison to a conventional heat pump system (without an ejector). The experimental facility, which utilizes hot and cold water as the heat source, can operate in two modes: The ejector heat pump water heater (EHP-WH) and heat pump water heater (HP-WH). The system was tested in transient conditions and the effect of ejector utilization on the system was determined. Results indicate that EHP-WH mode (COP between 5 and 6) had an average of 5.5% higher COP value than HP-WH mode (COP between 4.5 and 5.5). Furthermore, the heating capacity obtained in EHP-WH mode was 30% higher than in HP-WH. Additionally, the water cooler loop’s water temperature was 64.5% higher in EHP-WH mode than in HP-WH. Finally, it is determined that the ejector positively impacts on the performance of HP-WH system.
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