Study of helically coiled adiabatic capillary tubes for transcritical CO 2 expansion

Neeraj Agrawal and Souvik Bhattacharyya

International Journal of Low-Carbon Technologies, 2012, vol. 8, issue 4, 245-252

Abstract: Transcritical expansion through coiled adiabatic capillary tubes having CO 2 as the refrigerant is numerically simulated, and the performance is compared with the flow of R22 through such tubes. Mori and Nakayama friction factor correlation in combination with Churchill equation, which is fitted into the form of Blasius type equation, is employed to estimate the friction factor. Results indicate that the reduction in the mass flow rate with a coiled capillary tube compared with a straight one is more pronounced in case of R744 in comparison to R22. The mass flow rate of refrigerant increases as the coil diameter increases, but changes little beyond a coil diameter of 180 mm. Variation in gas-cooler exit temperature does not lead to any significant change in variation in the mass flow rate with coil diameter. A shorter capillary tube will be required to match the requisite system mass flow rate when coiled capillary tubes are employed in lieu of a straight one. Copyright , Oxford University Press.

Date: 2012
References: Add references at CitEc
Citations:

Downloads: (external link)
http://hdl.handle.net/10.1093/ijlct/cts047 (application/pdf)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:oup:ijlctc:v:8:y:2012:i:4:p:245-252

Access Statistics for this article

International Journal of Low-Carbon Technologies is currently edited by Saffa B. Riffat

More articles in International Journal of Low-Carbon Technologies from Oxford University Press
Bibliographic data for series maintained by Oxford University Press ().