Optimisation of the revolving vane expander
Neoh, Shi Liang
Date of Issue2015
School of Mechanical and Aerospace Engineering
The revolving vane (RV) expander is capable of improving the coefficient of performance (COP) of air-conditioning and refrigeration systems in two ways – through near-isentropic expansion and power generation. Following the development of theoretical models by Subiantoro  and the experimental investigations on the prototype of the RV expander by Subiantoro et al. , this Final Year Project aims to optimise the dimensions of the RV expander in order to maximise the generated power. The optimisation was performed using the mathematical models and the RV expander simulation developed by Subiantoro . Box’s  Complex method was used to solve this multi-variable, constrained optimisation problem. It was found that theoretically, it is possible to increase the generated power by up to 73% with a longer expander and a smaller radial clearance between the cylinder and rotor. The effects of the rotational velocity of the rotor on the generated power of the expander are also investigated. The optimisation and simulation routines were run using 360 rpm, 720 rpm and 1080 rpm as the angular velocity of the rotor. It was found that the generated power is the highest at 720 rpm. Results show a 30% improvement in the maximum power generated when the rotor runs at 720 rpm, as compared to the maximum power generated when the rotor runs at 360 rpm or 1080 rpm.
Final Year Project (FYP)
Nanyang Technological University