Low grade waste heat recovery using heat pumps and power cycles

D. M. van de Bor*, C. A. Infante Ferreira, Anton A. Kiss

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

66 Citations (Scopus)

Abstract

Thermal energy represents a large part of the global energy usage and about 43% of this energy is used for industrial applications. Large amounts are lost via exhaust gases, liquid streams and cooling water while the share of low temperature waste heat is the largest.Heat pumps upgrading waste heat to process heat and cooling and power cycles converting waste heat to electricity can make a strong impact in the related industries. The potential of several alternative technologies, either for the upgrading of low temperature waste heat such as compression-resorption, vapor compression and trans-critical heat pumps, or for the conversion of this waste heat by using organic Rankine, Kalina and trilateral cycle engines, are investigated with regards to energetic and economic performance by making use of thermodynamic models. This study focuses on temperature levels of 45-60 °C as at this temperature range large amounts of heat are rejected to the environment but also investigates the temperature levels for which power cycles become competitive. The heat pumps deliver 2.5-11 times more energy value than the power cycles in this low temperature range at equal waste heat input. Heat engines become competitive with heat pumps at waste heat temperatures at 100 °C and above.

Original languageEnglish
Article number7783
Pages (from-to)864-873
Number of pages10
JournalEnergy
Volume89
DOIs
Publication statusPublished - 1 Sep 2015
Externally publishedYes

Keywords

  • Compression-resorption
  • Economic comparison
  • Heat pumps
  • Power cycles
  • Waste heat

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