Akademik Veri Yönetim Sistemi
Isi Bilimi Ve Teknigi Dergisi/ Journal of Thermal Science and Technology, cilt.45, sa.2, ss.119-135, 2025 (SCI-Expanded, Scopus)
In this study, a water-source heat pump system was designed, manufactured, and experimentally investigated for space heating applications, with R-134a serving as the working refrigerant. The energy, exergy, and life cycle climate performances of two different systems were evaluated. The first system employed conventional POE oil as the compressor lubricant, while the second system used a nanolubricant, referred to as POE + Al2O3 nanofluid, formulated by adding 1 wt.% Al2O3 nanoparticles to the POE oil. The heat pump was tested under source water temperatures of 10 oC, 11 oC, and 12 oC. Within this scope, both the heating energy and exergy performances of the heat pump unit and the entire system, as well as their life cycle climate performances, were experimentally compared. The results indicate that the addition of Al2O3 nanoparticles increased the compressor power consumption by 1.62–3,0%. However, the heating energy performance of the heat pump unit decreased by 7.1–8.4%, and the overall system performance dropped by 12.5–22.8%. On the other hand, while the nanoparticle additive enhanced the exergy performance of the heat pump unit by 7–40%, it reduced the overall system exergy performance by 12.5–25%. Additionally, the Al2O3 additive improved the life cycle climate performance by 0.6–3.6%.