This work studies two binary mixtures of R1243zf + R1234yf and R245cb which can be possibly used as a long-term alternative refrigerant for heat pumps. We present critical property (critical temperature, pressure, density) vapor liquid equilibrium (VLE) binaries. The maximum extended uncertainties (k=2) are estimated U(T) = 0.21 K, U(p) 0.048 MPa, U(ρ) 6.4 kg/m3 measurement, 0.06 K 0.015 MPa bu...

Bu çal??mada otomobil klima sisteminde farkl? so?utucu ak??kanlar kullan?larak kompresör volumetrik verim de?erlerinin analizi yap?lm??t?r. Literatürde önerilen ampirik ba??nt?dan elde edilen çal??ma ?artlar?ndaki de?erleri ile uyumlulu?u kar??la?t?rmal? olarak de?erlendirilmi?tir. Deneysel çal??malardan sonuçlara ba?l? ba??nt?n?n s?n?r de?erleri, ba??nt?lara ve için kullan?labilirli?i ara?t?r?...

This work presents an energy, exergy, and environmental evaluation of a novel compound PV/T (photovoltaic thermal) waste heat driven ejector-heat pump system for simultaneous data center cooling recovery district heating networks. The uses with evaporative-condenser as driving force ejector while exploiting the generated electric power to operate compressor pumps. vapor compression assessed sev...

In this paper, a first- and second-law analysis of vapor compression refrigeration is presented to estimate propose the replacement R134 with working fluids having less global warming potential (GWP) exergy destruction irreversibilities. Six different refrigerants were studied, namely, R717, R1234yf, R290, R134a, R600a, R152a. A thermodynamic model was designed on Engineering Equation Solver (E...

This paper proposes a methodology aiming at determining the most influent working variables and geometrical parameters over pressure drop heat transfer during condensation process of several refrigerant gases using exchangers with pipes mini channels technology. A multi-criteria decision making (MCDM) was used; this MCDM includes mathematical method called SIMUS (Sequential Interactive Modellin...

Stable nanolubricant mixtures are interrelated with thermal conductivity enhancement, thus improving heat transfer performance in automotive air conditioning (AAC) systems. This paper studies the stability and of double-end capped polyalkylene glycol (PAG)-based nanolubricants specially designed for R1234yf refrigerant. Mono (Al2O3/PAG SiO2/PAG) hybrid (Al2O3–SiO2/PAG) were prepared using a two...