Scholarly record
PERFORMANCE ANALYSIS OF A MICRO GAS TURBINE BASED TRIGENERATION SYSTEM WORKING AS ELECTRIC BUS RANGE EXTENDER
Abstract
Making the automotive greener has led to a continuous intensification of studies for alternative technologies in road transport. The most promising of technology is based on electric propulsion. But beside many advantages, the electric vehicles have some disadvantages compared to conventional vehicles: limited driving range, long charging times, and insufficient charging infrastructure in some areas. Additionally, battery degradation over time (especially due to operation in extreme weather conditions in winter and summer) raises concerns about longevity. The objective of the paper is to assess the performance of a trigeneration system that consists of a micro gas turbine combined with a bottom steam cycle, a heat exchanger to generate hot water for an absorption chiller driving or hot water for heating. The system is a high-efficiency energy solution designed to improve range, reduce emissions, and provide on-board comfort (heating or cooling) especially during the extreme weather conditions. It generates electricity in gas turbine and steam turbine cycles for the battery pack and electric motor, while recovering waste heat for cabin heating and, in some cases, for cooling. The gas turbine uses biofuels, works at full power, produces significantly lower CO2, CO and NOx emissions compared to diesel engines and reaches an efficiency of (70–80) % due to properly waste heat recovery. The micro gas turbine produces high-quality heat and power. The exhaust gases temperature is ideal for driving a Rankine cycle and then an absorption chiller for cooling or providing space heating for the bus interior.
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