| 论文简介 |
In this paper, an ejector enhanced vapor injection CO2 transcritical heat pump cycle with
sub-cooler (ESCVI) for heating application in cold regions is proposed. The thermodynamic
analysis using energetic and exegetic methods is carried out to predict the performance
characteristics of the ejector enhanced cycle, and then compared with those of the conventional
vapor injection heat pump cycle with sub-cooler (SCVI). The simulation results
demonstrate that the ejector enhanced cycle exhibits better performance than the conventional
vapor injection cycle under the specified operating conditions. The improvements
of the maximum system COP and volumetric heating capacity could reach up to
7.7% and 9.5%, respectively. Exergetic analysis indicates that the largest exergy destruction
ratio is generated at the compressor followed by the evaporator and gas cooler. Additionally,
the exergy efficiency of the ejector is introduced to quantify the effectiveness of
the exergy recovery process, which may be a new criterion to evaluate the performance of
the ejector enhanced vapor compression cycle. |
(创新港)
