کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
789624 | 1466449 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization](/preview/png/789624.png)
This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes.
Journal: International Journal of Refrigeration - Volume 34, Issue 4, June 2011, Pages 870–880