Abstract
Organic Rankine cycles (ORC) are used to produce power from low-temperature heat sources. In the low power output range (
Highlights
Climate change and global warming have become a major concern for the world
Many experimental studies have been conducted to demonstrate the use of scroll expanders as an expansion devices for micro organic Rankine cycle (ORC) power generation systems
This paper aims to investigate the performance of the scroll expander under varying operating conditions, using a validated semi-empirical model available in the literature [40]
Summary
Climate change and global warming have become a major concern for the world. The global community has committed itself to increase energy sustainability by increasing renewable energy generation and reducing dependency on fossil fuels. This paper aims to investigate the performance of the scroll expander under varying operating conditions, using a validated semi-empirical model available in the literature [40] Using this model, the effect of expansion ratio, shaft speed, and expander inlet temperature on the mass flow rate, work output, and expander efficiency havebeen analysed. The power curve is shifted downwards at lower shaft speeds at the same inlet pressures This is due to the decrease in mass flow rate of the working fluid as shown in fig. The degree of superheat of the fluid determines the quantum of heat exchange with the wall in the isobaric cooling process, modelled at the inlet This thermal energy which is exchanged is an important component similar to the power loss. Higher shaft speed increases the wall temperature, as high shaft speeds lead to more frictional power loss
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