Abstract
The applications of a transcritical CO₂ cycle into water heaters show advantages over conventional systems in the respect of power consumption and heating efficiency because the CO₂ cycle has a high compressor discharge temperature. Besides, the heating performance of the transcritical CO₂ cycle can be improved by optimizing operating conditions. In this study, the heating performance of a variable speed CO₂ heat pump was measured and analyzed by varying refrigerant charge amount, EEV opening, compressor frequency and outdoor temperature. As a result, the optimum normalized charge for heating was 0.226. The COPs at the compressor frequencies of 40, 50 and 60 ㎐ were 2.94, 2.75 and 2.25, respectively. The heating performance of the CO₂ cycle with charge amount was more sensitive than the cooling performance. Moreover, the heating performance was improved significantly by optimizing of compressor frequency and EEV opening.
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