Feasibility of Thermoelectrics for Waste Heat Recovery in Conventional Vehicles

Smith, K. ; Thornton, M.

National Renewable Energy Laboratory (U.S.)

关键词: Efficiency;    Waste Heat Thermoelectrics;    Transportation;    Waste Heat Recovery;    Economics;   

DOI  :  10.2172/951806
RP-ID  :  NREL/TP-540-44247
RP-ID  :  AC36-99-GO10337
RP-ID  :  951806

美国|英语

来源: UNT Digital Library

【 摘 要 】

Thermoelectric (TE) generators convert heat directly into electricity when a temperature gradient is applied across junctions of two dissimilar metals. The devices could increase the fuel economy of conventional vehicles by recapturing part of the waste heat from engine exhaust and generating electricity to power accessory loads. A simple vehicle and engine waste heat model showed that a Class 8 truck presents the least challenging requirements for TE system efficiency, mass, and cost; these trucks have a fairly high amount of exhaust waste heat, have low mass sensitivity, and travel many miles per year. These factors help maximize fuel savings and economic benefits. A driving/duty cycle analysis shows strong sensitivity of waste heat, and thus TE system electrical output, to vehicle speed and driving cycle. With a typical alternator, a TE system could allow electrification of 8%-15% of a Class 8 truck's accessories for 2%-3% fuel savings. More research should reduce system cost and improve economics.