Abstract The substitution of working fluids in vapour-compression plants causes major problems, because of a reduced plant performance. Therefore, extremely accurate design procedures are needed, because the relative sizing of each plant-component is essential for the cycle performance. For this reason, the knowledge of the heat-transfer characteristics of new fluids in condensers and evaporators is mandatory. The heat-transfer characteristics of R410A and R404A were experimentally investigated and analyzed as a function of evaporating pressure, heat and mass flux. The test section was a smooth, horizontal, stainless steel tube (6 mm ID, 6 m length) uniformly heated by the Joule effect. The working parameter was varied within the following ranges: evaporating pressure 3–12 bar, refrigerant mass-flux 290–1100 kg/m2 s, heat flux 11–39 kW/m2, respectively.
Flow boiling heat transfer with HFC mixtures in a smooth horizontal tube. Part I: an experimental investigation / Greco, Adriana; G. P., Vanoli. - In: EXPERIMENTAL THERMAL AND FLUID SCIENCE. - ISSN 0894-1777. - STAMPA. - 29:(2005), pp. 189-198.
Flow boiling heat transfer with HFC mixtures in a smooth horizontal tube. Part I: an experimental investigation
GRECO, ADRIANA;
2005
Abstract
Abstract The substitution of working fluids in vapour-compression plants causes major problems, because of a reduced plant performance. Therefore, extremely accurate design procedures are needed, because the relative sizing of each plant-component is essential for the cycle performance. For this reason, the knowledge of the heat-transfer characteristics of new fluids in condensers and evaporators is mandatory. The heat-transfer characteristics of R410A and R404A were experimentally investigated and analyzed as a function of evaporating pressure, heat and mass flux. The test section was a smooth, horizontal, stainless steel tube (6 mm ID, 6 m length) uniformly heated by the Joule effect. The working parameter was varied within the following ranges: evaporating pressure 3–12 bar, refrigerant mass-flux 290–1100 kg/m2 s, heat flux 11–39 kW/m2, respectively.File | Dimensione | Formato | |
---|---|---|---|
ETFS2005.pdf
non disponibili
Tipologia:
Documento in Post-print
Licenza:
Accesso privato/ristretto
Dimensione
398.77 kB
Formato
Adobe PDF
|
398.77 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.