Aligning with the global movements towards mitigating CO2 emissions and regulations to phase out HFC refrigerants, many low GWP refrigerants are being tested and proposed as fourth-generation refrigerants. R1234yf is a refrigerant with a GWP of less than one and has a high potential to replace R134a, which has a GWP of 1300, and it is the most commonly used refrigerant in domestic refrigerators. In this study, an energy performance evaluation and a life cycle climate performance assessment for R1234yf were conducted and compared to those of R134a based on a baseline domestic defrost refrigerators. Four different charges of R1234yf (166.5g, 185g, 202g, and 221g) were tested on three thermostat points (low, medium, and high) and compared with the recommended manufacturer charge of R134a. This study ended up with R1234yf can reduce daily energy consumption by 5 to 2% depending on the thermostat setting. Also, the R1234yf charge optimization to the lowest life cycle CO2 emissions shows that reducing the charge from the baseline value of 185g to 166.5g proves to be the best option. In addition, all R1234yf charges achieved lower evaporation temperature than R134a at all thermostat settings. Also, R1234yf charges were able to achieve similar freezer and refrigerator air temperatures to that of R134a.
School of Sciences and Engineering
Mechanical Engineering Department
MS in Mechanical Engineering
Committee Member 1
Salah El Haggar
Committee Member 2
Institutional Review Board (IRB) Approval
Not necessary for this item
Khaled Zain, M. S.
(2021).Life Cycle Climate Performance Assessment for R1234yf As a Low GWP Drop-In Alternative for R134a in Domestic Refrigerators [Master's Thesis, the American University in Cairo]. AUC Knowledge Fountain.
Khaled Zain, Mohamed Ragab Senosey. Life Cycle Climate Performance Assessment for R1234yf As a Low GWP Drop-In Alternative for R134a in Domestic Refrigerators. 2021. American University in Cairo, Master's Thesis. AUC Knowledge Fountain.