Cascaded thermoelectric generation and absorption refrigeration waste heat recovery

Shahzaib B. Abbasi, Alexander S. Rattner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thermoelectric generation (TEG) and absorption cooling have been identified as promising pathways for waste heat recovery (WHR). TEGs reject most of the high-source-temperature thermal energy they receive to the ambient, while converting only 5-10% of that energy. Absorption cycles can harness low-to-mid grade waste heat (70 - 200°C) to deliver refrigeration at COPs of 0.5 - 1.2+. These two technologies are well-suited for integration. If the heat rejection temperature of a TEG system is slightly elevated, its power generation capacity would only be somewhat reduced, and its unconverted input energy can activate an absorption system. This can be considered cascaded WHR, because waste heat cascades through processes that harness both high and low availability portions of input energy. In this study, a model is developed for cascaded TEG and absorption cooling WHR. Thermoeconomic performance is assessed for two potential applications. In a refrigerated transport truck, engine exhaust could be used to produce 770 W electricity and 12 kW cooling at -15°C. Payback periods could approach 3 years. Cascaded WHR from an industrial carburizing furnace (50 kW recovered) could deliver electricity (3.3 kWe) and chilled water (27 kWth). The cascaded system payback period (6.7 yrs) is projected to be higher than standalone TEG (5.4 yrs) but lower than absorption cooling (6.9 yrs). While further research is needed to refine these thermoeconomics projections, the integration and flexibility advantages of this concept may advance adoption of waste heat recovery.

Original languageEnglish (US)
Title of host publicationProceedings of the 3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
PublisherBegell House Inc.
Pages1793-1797
Number of pages5
ISBN (Electronic)9781567004724
DOIs
StatePublished - 2018
Event3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018 - Fort Lauderdale, United States
Duration: Mar 4 2018Mar 7 2018

Publication series

NameProceedings of the Thermal and Fluids Engineering Summer Conference
Volume2018-March
ISSN (Electronic)2379-1748

Conference

Conference3rd Thermal and Fluid Engineering Summer Conference, TFESC 2018
CountryUnited States
CityFort Lauderdale
Period3/4/183/7/18

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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