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Parametric evaluation and performance comparison of a modified CO2 transcritical refrigeration cycle in air-conditioning applications

Wang, Zhe LU ; Han, Fenghui and Sundén, Bengt LU (2017) In Chemical Engineering Research and Design
Abstract

Nowadays, the main two issues of heating ventilation and air conditioning (HVAC) are refrigerant alternative and system efficiency improvement. As a safe and environmental protective refrigerant, CO2 has drawn a lot of attention these years. The improvement on its transcritical cycle efficiency has always been the study hotspot. On the basis of the traditional cycle system, this paper adds the internal heat exchangers (IHE) and pressure control devices into the system and optimizes the CO2 transcritical system with the dual throttling device. Engineering equation solver is used to build each module in the system as an object-oriented model. The effects of the IHE and bypass valve on system performance are... (More)

Nowadays, the main two issues of heating ventilation and air conditioning (HVAC) are refrigerant alternative and system efficiency improvement. As a safe and environmental protective refrigerant, CO2 has drawn a lot of attention these years. The improvement on its transcritical cycle efficiency has always been the study hotspot. On the basis of the traditional cycle system, this paper adds the internal heat exchangers (IHE) and pressure control devices into the system and optimizes the CO2 transcritical system with the dual throttling device. Engineering equation solver is used to build each module in the system as an object-oriented model. The effects of the IHE and bypass valve on system performance are investigated. The performance and configuration of four CO2 transcritical refrigeration cycles are analyzed and compared. Numerical studies also propose the formula expressing the relationship of the optimum high pressure, the gas-cooler CO2 outlet temperature and the evaporation temperature under specific operating conditions. In addition, the modified system can significantly improve the performance of the system under the operating conditions below the optimum high pressure. This research has played an effective guiding and facilitating role for CO2 transcritical refrigeration system development, optimization and improvement.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Air-conditioning applications, CO transcritical cycle, Parametric evaluation, Performance comparison, System improvement
in
Chemical Engineering Research and Design
publisher
IChemE
external identifiers
  • scopus:85028357870
ISSN
0263-8762
DOI
10.1016/j.cherd.2017.08.003
language
English
LU publication?
yes
id
6a11d290-2aa4-460c-9fba-a26831420e49
date added to LUP
2017-09-15 09:20:56
date last changed
2017-09-15 09:20:56
@article{6a11d290-2aa4-460c-9fba-a26831420e49,
  abstract     = {<p>Nowadays, the main two issues of heating ventilation and air conditioning (HVAC) are refrigerant alternative and system efficiency improvement. As a safe and environmental protective refrigerant, CO<sub>2</sub> has drawn a lot of attention these years. The improvement on its transcritical cycle efficiency has always been the study hotspot. On the basis of the traditional cycle system, this paper adds the internal heat exchangers (IHE) and pressure control devices into the system and optimizes the CO<sub>2</sub> transcritical system with the dual throttling device. Engineering equation solver is used to build each module in the system as an object-oriented model. The effects of the IHE and bypass valve on system performance are investigated. The performance and configuration of four CO<sub>2</sub> transcritical refrigeration cycles are analyzed and compared. Numerical studies also propose the formula expressing the relationship of the optimum high pressure, the gas-cooler CO<sub>2</sub> outlet temperature and the evaporation temperature under specific operating conditions. In addition, the modified system can significantly improve the performance of the system under the operating conditions below the optimum high pressure. This research has played an effective guiding and facilitating role for CO<sub>2</sub> transcritical refrigeration system development, optimization and improvement.</p>},
  author       = {Wang, Zhe and Han, Fenghui and Sundén, Bengt},
  issn         = {0263-8762},
  keyword      = {Air-conditioning applications,CO transcritical cycle,Parametric evaluation,Performance comparison,System improvement},
  language     = {eng},
  month        = {08},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research and Design},
  title        = {Parametric evaluation and performance comparison of a modified CO<sub>2</sub> transcritical refrigeration cycle in air-conditioning applications},
  url          = {http://dx.doi.org/10.1016/j.cherd.2017.08.003},
  year         = {2017},
}