A study on the fluid refrigerant charge in a Two-Phase Mechanically Pumped Loop system using R134a and R1234yf

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-07-25
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Language
en
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Applied Thermal Engineering, articlenumber 113727
Abstract
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.
Description
Keywords
TMPL, R1234yf, R134a, void fraction, refrigerant charge, Refrigerant charge, Void fraction, HFO-1234YF, DROP-IN REPLACEMENT, PERFORMANCE, POTENTIALS, FLOW, LOW-GWP REFRIGERANTS, PRESSURE-DROP, BOILING HEAT-TRANSFER, COOLING LOOP, VOID FRACTION
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Citation
Pereira , L , Humia , G , Khosravi , A , Revellin , R , Bonjour , J , Machado , L & Garcia Pabon , J J 2019 , ' A study on the fluid refrigerant charge in a Two-Phase Mechanically Pumped Loop system using R134a and R1234yf ' , Applied Thermal Engineering , vol. 158 , 113727 . https://doi.org/10.1016/j.applthermaleng.2019.113727