- Universidade Federal de Minas Gerais
- Universite Claude Bernard Lyon 1
- Federal University of Itajubá
Heat management by means of two-phase mechanically pumped loop (TMPL) possesses promising advantages such as long-distance heat transport, high heat density and good temperature control. Knowledge of the fluid charge has great importance for TMPL system efficiency. The present work is a theoretical/experimental study on the refrigerant charge in TMPL system using R134a and R1234yf refrigerants. The mass of refrigerant in the TMPL system was measured for several cooling capacities. The effects of vapor quality in the evaporator (varying from 0.1 to 1), mass flux (300kg.s-1m-2 and 400kg.s-1m-2), and saturation temperature (25°C and 30°C) on refrigerant charge in the TMPL were experimentally investigated. About 70 experimental points were analyzed and compared with a theoretical model employing eight different prediction tools for the determination of the void fraction. The best results were obtained by Zivi and Hughmark correlations with mean absolute errors of 12% and 13%, respectively.
|Journal||Applied Thermal Engineering|
|Publication status||E-pub ahead of print - 9 May 2019|
|MoE publication type||A1 Journal article-refereed|
- TMPL, R1234yf, R134a, void fraction, refrigerant charge