A prototype water-ammonia absorption heat transformer has been built and thoroughly tested. Compared to water-salts mixtures, water-ammonia allows operating the machine in a lower temperature range, fostering recover of low-grade heat. Driving temperatures between 60 °C and 64 °C were tested, with condenser temperatures of 8–16 °C. The unit proved able to operate in a stable, reliable and repeatable way in this working range, achieving gross temperature lifts up to 25 °C and thermal COPs in the range 0.400–0.475. Useful effect up to 4.5 kW was achieved, with electric consumption always below 100 W.

A water-ammonia heat transformer to upgrade low-temperature waste heat

GARONE, SILVIA;TOPPI, TOMMASO;GUERRA, MARCO;MOTTA, MARIO
2017-01-01

Abstract

A prototype water-ammonia absorption heat transformer has been built and thoroughly tested. Compared to water-salts mixtures, water-ammonia allows operating the machine in a lower temperature range, fostering recover of low-grade heat. Driving temperatures between 60 °C and 64 °C were tested, with condenser temperatures of 8–16 °C. The unit proved able to operate in a stable, reliable and repeatable way in this working range, achieving gross temperature lifts up to 25 °C and thermal COPs in the range 0.400–0.475. Useful effect up to 4.5 kW was achieved, with electric consumption always below 100 W.
Absorption; Heat transformer; Low-grade heat; Prototype, heat recovery; Water-ammonia; Energy Engineering and Power Technology; Industrial and Manufacturing Engineering
File in questo prodotto:
File Dimensione Formato  
11311-1033900_Toppi.pdf

accesso aperto

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 1.6 MB
Formato Adobe PDF
1.6 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1033900
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 15
social impact