CFD study of a variable area ratio ejector using R600a and R152a refrigerants

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Pedro Lebre (Autor) FEUP; Szabolcs Varga (Autor) FEUP; Armando C. Oliveira (Autor) FEUP

Revista

Título: International Journal of Refrigeration

Vol. 36

Páginas: 157-165

ISSN: 0140-7007

Editora: Elsevier

Indexação

ISI Web of Knowledge - 45 Citações

ISI Web of Science

Scopus - 59 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-002-1JW

DOI: 10.1016/j.ijrefrig.2012.10.016

Abstract (EN): In the present paper, the numerical results for two 1 kW cooling capacity ejectors with variable primary nozzle geometry are presented using R152a and R600a as working fluids. Working fluids were selected based on the criteria of low environmental impact and good performance in the range of operating conditions adequate for using solar thermal energy as primary heat source. Variable area ratio was achieved by applying a movable spindle at the primary nozzle inlet. Numerical results clearly show that adjusting spindle position resulted in a significant improvement of the entrainment ratio compared to a fixed geometry ejector when the operating conditions were different from design values. This increase in ejector performance was as high as 177% for low condenser pressures. Diagrams are also presented for both refrigerants that can be used to find spindle positions that maximise ejector performance under variable operating conditions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9