City Research Online

Abstract

Twin Screw compressors are widely used in the refrigeration sector, chillers, and applications like heat pumps due to their high durability and reliability. In this study, the use of an ultra-low GWP refrigerant R1234ze(E) and oil injected operation of a test compressor is evaluated using thermodynamic chamber model. A 4/5 lobe combination with an N type rotor profile is used. Design exploration is set up to analyse parameters of wrap angle, rotor length and built-in volume index to improve the rotor geometry at a rated pressure ratio of 8 and speed of 10,000 rpm. A full operating condition performance map is then obtained on the improved geometry. A 12% improvement in refrigeration capacity from 86 to 96 kW was achieved with a 5% higher adiabatic efficiency. Further, a detailed CFD model is employed to verify these design changes. Performance results from the chamber and CFD models are compared and indicate an average of 8% difference in the refrigerant mass flow rate and compressor power.

Publication Type:	Conference or Workshop Item (Paper)
Additional Information:	© 2026 The Author(s), under exclusive license to Springer Nature Switzerland AG. This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/978-3-032-04102-9_1
Publisher Keywords:	Screw compressor, Oil injection, R1234ze( E), CFD
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology School of Science & Technology > Department of Engineering
SWORD Depositor:	Symplectic Administrator

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