Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/12487
Title: Design optimisation of CO2 gas cooler/condenser in a refrigeration system
Authors: Ge, YT
Tassou, SA
Santosa, ID
Tsamos, K
Keywords: CO2 gas cooler or condenser;Test facilities;Experiment and modelling;Heat exchanger sizes and controls;Refrigeration system
Issue Date: 2014
Publisher: Elsevier
Citation: Energy Procedia, 61: pp. 2311 - 2314, (2014)
Abstract: As a natural working fluid, CO2 has been widely applied in refrigeration and heat pump systems where heat is conventionally rereleased to ambient through external airflow. Owing to extraordinary thermophysical properties, especially its low critical temperature, the CO2 heat release through a highpressure side heat exchanger will inevitably undergo either supercritical or subcritical processes, depending on ambient air temperatures and head pressure controls. Correspondingly, the heat exchanger will act intermittently as either a gas cooler or condenser within the system during an annual operation. Such evidence should therefore be taken into account for an optimal design of the heat exchanger and head pressure controls in order to significantly enhance the performance of both components and the associated system. To achieve these targets, two CO2 finned-T ube gas coolers/condensers with different structural designs and controls have been purposely built, instrumented and connected with an existing test rig of a CO2 booster refrigeration system. Consequently, the performance of the CO2 gas coolers/condensers with different structure designs, controls and system integration at different operating conditions can be thoroughly investigated through experimentation. In the meantime, models of the finned-T ube CO2 gas coolers/condensers have been developed using both the distributed (detailed model) and lumped (simple model) methods. The former is employed to give a detailed prediction of the working fluid temperature profiles, localized heat transfer rates and effects of pipe circuitry arrangements, while the latter is suitable for the simulation and optimisation of system integration with less computation time. Both models have been validated with measurements, and moreover the simple model has been integrated with other component models so as to create a system model. The effects of the CO2 gas cooler/condenser sizes and controls on the system performance can thus be compared and analysed.
URI: http://www.sciencedirect.com/science/article/pii/S1876610214030215
http://bura.brunel.ac.uk/handle/2438/12487
DOI: http://dx.doi.org/10.1016/j.egypro.2014.11.1191
ISSN: 1876-6102
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

Files in This Item:
File Description SizeFormat 
Fulltext.pdf546.39 kBAdobe PDFView/Open


Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.