Our Projects

A 350 kWe Hybrid Parallel Gas Turbine

Introduction:
Stringent emissions standards and increasing fuel prices drive a need for alternatives to the traditional piston internal combustion engine (ICE). The ICR350 gas turbine engine produces 350 kW peak power in a direct-drive application for Class 8 trucks. When combined with a high-efficiency electric drive system in a parallel-hybrid configuration, >15% fuel economy gains can be realized, over modern diesel. The fuel agnostic gas turbine beats the most stringent emission regulations without after treatment.

ICR350 Engine Cycle:
The intercooled, recuperated 2-stage compression and 3-stage expansion cycle is shown at right.

The combustor is configured to allow on-the-fly fuel switching between diesel and natural gas. This feature allows fleet operators to use the most economical fuel choice for local operation, and range extension when outside areas with natural gas infrastructure.

Overall cycle efficiency is 44%, in part due to a high-effectiveness recuperator (90%) and the high firing temperature (1370K). The recuperator is a proprietary Brayton Energy design featuring modular cell construction.

Predicted engine overhaul interval is 1 million miles (20,000 hrs). The improved maintenance interval compared to diesel engines reduces overhead for fleet operators.

Enabling Technology: Ceramic Turbine and Hot Section:
Ceramic technology enables higher firing temperatures that improve cycle efficiency. The High Pressure (HP) turbine wheel is made from silicon nitride using a process that has been proven in automotive applications to yield low cost and high reliability.