Journal
SOLAR ENERGY
Volume 184, Issue -, Pages 527-538Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2019.04.027
Keywords
Alternative refrigerants; DX-SAHP; R1234yf; R290; R600a; R744
Categories
Funding
- Foundation for Research Support of the State of Minas Gerais (FAPEMIG) [AUC-00032-16]
- Coordination for the Improvement of Higher Education Personnel (CAPES) through the program PNPD/CAPES
- CNPq
Ask authors/readers for more resources
An important step during a project of a heat pump system is choosing a more suitable refrigerant. This paper presents a comparative study among refrigerants for a small direct expansion solar assisted heat pump (DX-SAHP). The mathematical model used in this study is presented in detail and validated from an experimental setup. The R134a is the reference and the refrigerants with low GWP are R290, R600a, R744 and R1234yf. The results show that R290 has better COP than others refrigerants for solar radiation between 300 W/m(2) and 700 W/m(2), as well as for environment temperature between 10 degrees C and 35 degrees C. On the other hand, for solar radiation less than 50 W/m(2), the R134a has better COP than R290. TEWI (Total Equivalent Warming Impact) analysis indicates that the indirect emission is the most important effect, and then, the TEWI results almost followed the COP outcome. A parametric analysis was conducted to evaluate the influence of the CO2 emission factor for producing electricity. In countries with higher emission factor, the refrigerant with the best COP has the best TEWI. The influence of wind speed and ambient temperature in COP of a DX-SAHP using R290 were more relevant in low solar radiation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available