This research provides fundamental principles to study the thermodynamic performance of the screw expander at part-load working conditions. Screw expanders are rotary-type volumetric machines which can convert thermal to mechanical energy with a satisfactory efficiency even for low-grade heat sources and when expanding fluid in two-phase conditions, unlike standard dynamic expanders which are unable to handle with liquid droplets. However, since screw expanders operate at off-design condition in most situations, calculating expander efficiency under fluctuating working conditions appears to be a crucial issue. Hence, in this study, a part-load thermodynamic model on the real expansion process of the screw expander is investigated considering all the energy losses affecting actual working conditions, also including variable fluid leakage losses. Therefore, in relation to the part-load behavior of this volumetric power machine, the optimum working conditions together with the resultant best global efficiencies are defined and shown. Lastly, the predicted energy performance is compared with experimental data, so obtaining a good agreement between the calculated and measured overall efficiency of screw expanders.

THERMODYNAMIC ANALYSIS OF SCREW EXPANDERS AT PART-LOAD WORKING CONDITIONS: ENERGY LOSSES, FLUID LEAKAGE AND OVERALL EFFICIENCY / Iodice, P.; Amoresano, A.; Langella, G.. - In: INTERNATIONAL JOURNAL OF MECHANICS AND CONTROL. - ISSN 1590-8844. - 24:1(2023), pp. 89-96.

THERMODYNAMIC ANALYSIS OF SCREW EXPANDERS AT PART-LOAD WORKING CONDITIONS: ENERGY LOSSES, FLUID LEAKAGE AND OVERALL EFFICIENCY

Iodice P.
Primo
;
Amoresano A.;Langella G.
2023

Abstract

This research provides fundamental principles to study the thermodynamic performance of the screw expander at part-load working conditions. Screw expanders are rotary-type volumetric machines which can convert thermal to mechanical energy with a satisfactory efficiency even for low-grade heat sources and when expanding fluid in two-phase conditions, unlike standard dynamic expanders which are unable to handle with liquid droplets. However, since screw expanders operate at off-design condition in most situations, calculating expander efficiency under fluctuating working conditions appears to be a crucial issue. Hence, in this study, a part-load thermodynamic model on the real expansion process of the screw expander is investigated considering all the energy losses affecting actual working conditions, also including variable fluid leakage losses. Therefore, in relation to the part-load behavior of this volumetric power machine, the optimum working conditions together with the resultant best global efficiencies are defined and shown. Lastly, the predicted energy performance is compared with experimental data, so obtaining a good agreement between the calculated and measured overall efficiency of screw expanders.
2023
THERMODYNAMIC ANALYSIS OF SCREW EXPANDERS AT PART-LOAD WORKING CONDITIONS: ENERGY LOSSES, FLUID LEAKAGE AND OVERALL EFFICIENCY / Iodice, P.; Amoresano, A.; Langella, G.. - In: INTERNATIONAL JOURNAL OF MECHANICS AND CONTROL. - ISSN 1590-8844. - 24:1(2023), pp. 89-96.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/931627
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