Results 41 to 50 of about 81 (69)

Performances of multi-vane expanders

Applied Energy, 1985
Abstract Multi-vane expanders possess many advantages as prime movers for organic Rankine-cycle power systems utilising low grade energy as the heat inputs, particularly for low power outputs (i.e.
O. Badr, S.D. Probert, P. O'Callaghan
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Multi-vane expanders: Internal-leakage losses

Applied Energy, 1985
Abstract Secondary flows of the working fluid via internal leakage paths in an MVE contribute significantly to its efficiency reduction. So the major leakage channels were indentified, and a mathematical model for predicting the flow rates via them has been developed.
O. Badr, S.D. Probert, P.W. O'Callaghan
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Multi-vane expander performance: Breathing characteristics

Applied Energy, 1985
Abstract The throttling of the working fluid flow at the inlet and exhaust port openings of multi-vane expanders leads to power losses. Therefore, a mathematical model has been developed to analyse their breathing characteristics. In particular two existing designs of multi-vane expanders, using refrigerant 113 as the working fluid, were considered ...
O. Badr, P.W. O'Callaghan, S.D. Probert
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Multi-vane expanders: Vane dynamics and friction losses

Applied Energy, 1985
Abstract Mechanical friction and viscous drag represent major causes of power loss in multi-vane expanders. So a mathematical model has been developed to describe these loss phenomena. The constructed dynamic model was employed to investigate the loss of contact between the vanes and the stator-cylinder, which results in significant internal leakage ...
O. Badr, S.D. Probert, P. O'Callaghan
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Optimal design and operating conditions for a multi-vane expander

Applied Energy, 1986
Abstract Multi-vane expanders (MVEs) possess several advantages over turbines and other positive-displacement machines (i.e. reciprocating or screw expanders) as prime movers for low grade energy engines, particularly for systems with low (
O. Badr, S.D. Probert, P.W. O'Callaghan
openaire   +1 more source

Influences of vane design and lubricant on a multi-vane expander's performance

Applied Energy, 1986
Abstract Multi-vane expanders possess advantages as prime movers for organic Rankine-cycle engines stimulated by low-grade heat, particularly for low-power output applications. The behaviours of the vanes in these devices influence radically their overall performances. In this study, the effects of the percentage of the lubricating oil mixed with the
O. Badr, S.D. Probert, P.W. O'Callaghan
openaire   +1 more source

Selection of operating conditions and optimisation of design parameters for multi-vane expanders

Applied Energy, 1986
Abstract Multi-vane expanders possess many advantages as prime movers for organic Rankine-cycle engines utilising low-grade heat as the energy inputs. The performances of these devices can be improved considerably by the proper selection of the operating conditions for existing units and by optimising their designs proposed for specified applications.
O. Badr, D. Probert, P.W. O'Callaghan
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Multi-Vane Expanders as Prime Movers in Low-Grade Energy Engines

Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering, 1986
Multi-vane expanders possess many advantages, over turbines and other positive-displacement machines, as prime movers for low-grade energy engines of small power outputs. It has been found that the performances of such expanders can be improved considerably by optimizing their design and operating variables.
O Badr, D Probert, P W O'Callaghan
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Multi-vane expanders as prime movers for low-grade energy organic Rankine-cycle engines

Applied Energy, 1984
Abstract The behaviour of the prime mover in a low-grade energy Rankine-cycle engine is one of the most important factors affecting the overall system performance. A survey of published data concerning various types of expander in use in Rankine engines and an analysis based on the concept of similarity shows that, for the low power outputs ...
O. Badr, P.W. O'Callaghan, M. Hussein, S.D. Probert   +3 more
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