Next Article in Journal
Gasification of Agroresidues for Syngas Production
Previous Article in Journal
Optimal Distribution Network Reconfiguration through Integration of Cycle-Break and Genetic Algorithms
Open AccessArticle

Parameter Sensitivity Study for Typical Expander-Based Transcritical CO2 Refrigeration Cycles

Energy School, Xi’an University of Science and Technology, Yanta Road, Xi’an 710054, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(5), 1279; https://doi.org/10.3390/en11051279
Received: 18 April 2018 / Revised: 7 May 2018 / Accepted: 14 May 2018 / Published: 17 May 2018
A sensitivity study was conducted for three typical expander-based transcritical CO2 cycles with the developed simulation model, and the sensitivities of the maximum coefficient of performance (COP) to the key operating parameters, including the inlet pressure of gas cooler, the temperatures at evaporator inlet and gas cooler outlet, the inter-stage pressure and the isentropic efficiency of expander, were obtained. The results showed that the sensitivity to the gas cooler inlet pressure differs greatly before and after the optimal gas cooler inlet pressure. The sensitivity to the intercooler outlet temperature in the two-stage cycles increases sharply to near zero and then keeps almost constant at intercooler outlet temperature of higher than 45 °C. However, the sensitivity stabilizes near zero when the evaporator inlet temperature is very low of −26.1 °C. In two-stage compression with an intercooler and an expander assisting in driving the first-stage compressor (TEADFC) cycle, an abrupt change in the sensitivity of maximum COP to the inter-stage pressure was observed, but disappeared after intercooler outlet temperature exceeds 50 °C. The sensitivity of maximum COP to the expander isentropic efficiency increases almost linearly with the expander isentropic efficiency. View Full-Text
Keywords: parameter sensitivity; CO2 transcritical cycle; refrigeration; expander; COP parameter sensitivity; CO2 transcritical cycle; refrigeration; expander; COP
Show Figures

Figure 1

MDPI and ACS Style

Zhang, B.; Chen, L.; Liu, L.; Zhang, X.; Wang, M.; Ji, C.; Song, K.-I. Parameter Sensitivity Study for Typical Expander-Based Transcritical CO2 Refrigeration Cycles. Energies 2018, 11, 1279.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop