Abstract
An investigation was carried out to find the most optimum configuration, particularly the torque matching characteristics, of an integrated Revolving Vane compressor- expander. To carry out the study, a mathematical model of the integrated compressor-expander was developed. An open cycle air refrigeration system was adopted. The controlled parameter was the angle shift between the compressor and the expander. The observed parameters were the peak torque requirement and the bearing load. The results show that when properly matched, the peak torque can be reduced by more than 65% while the bearing loads can be reduced by up to 25%, depending on operating conditions. Unfortunately, the optimum angle shifts for peak torque do not always coincide with those for bearing load. When the pressure and inertial components of the torques are comparable or when the inertial component is dominant, the optimum angle shifts for peak torque and bearing load are around 180° and 330°, respectively. When the pressure component is dominant, the optimum angle shift for peak torque is equal to the angle difference between the pressure peak torques of the compressor and the expander while for bearing load is around 150°.
Highlights
Revolving vane (RV) mechanism was introduced in 2006 [1] as a novel rotary mechanism that is simple and has low frictional losses
The performance was quantified by the peak torque requirement and the frictional loss
The integrated compressor-expander machine was assumed to operate in an open cycle air refrigeration system where the compressor and the expander were linked with a shared shaft as illustrated in figure 2
Summary
Revolving vane (RV) mechanism was introduced in 2006 [1] as a novel rotary mechanism that is simple and has low frictional losses. In its basic form, the mechanism has only 3 main components, i.e. a cylinder, a rotor and a vane. Unlike typical rotary mechanisms where the cylinders are stationary, the cylinder of a RV machine rotates together with the rotor. This results in reduced relative velocities between the rubbing surfaces and the frictional losses are reduced too. The main components and the working principle as an expander of one of the variants, called “RV-I” elsewhere [11], are shown in figure 1
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