Thermal conductivity measurements of pure R1243zf and binary mixtures R32 + R1234yf were conducted in the homogeneous liquid vapour phases with a transient hot-wire technique. The mole fractions are 0.25, 0.50, 0.75 both systems. temperature range was from (264.1 to 405.6) K pressures ranging between (0.9 6.1) MPa. apparatus validated CO2 regions. relative combined expanded uncertainty (k = 2) ...

This paper aims to evaluate residential air conditioning systems' performance enhancement and optimization by adopting a novel functionalized Al2O3 (FAl2O3)–Polyolester (POE) nanolubricant. Comprehensive discussions were conducted on key parameters, including heat absorption, compressor work, cooling capacity, coefficient of (COP), power consumption. Novel FAl2O3 nanoparticles dispersed into th...

The performance characteristics of an ejector-expansion refrigeration cycle (EEC) using R32 have been investigated in comparison with that using R134a. The coefficient of performance (COP), the exergy destruction, the exergy efficiency and the suction nozzle pressure drop (SNPD) are discussed. The results show that the application of an ejector instead of a throttle valve in R32 cycle decreases...

In the present study, the flow boiling heat transfer of R1234ze(E), R32 and zeotropic mixture R1234ze(E)/R32 (50/50 mass%) in a horizontal micro-fin tube is experimentally investigated to clarify the pressure drop and heat transfer characteristics. Tested micro-fin tube is made of copper, and its geometry is as follows, 6.00 mm in outer diameter, 5.21 mm in mean inside diameter, 0.26 mm in fin ...

This paper presents an analytical evaluation of isobutane (R600a), propane (R290), R134a, R22, R410A, and R32 in a vapor compression system used for comfort cooling applications. The evaluation method was based on a system simulation model that was complimented with an evolutionary computation module for the optimization of refrigerant circuitries in the evaporator and condenser. The evaluation...

The working fluids are crucial for developing the absorption refrigeration system. Our previous work has proposed three novel pairs, which uses low-GWP HFCs (R32, R152a and R161) as refrigerants polyethylene-glycol dimethylether solvent DMETEG absorbent. To explore VLE behaviors of in other longer chain structures solvents, modified UNIFAC (Dortmund) model was applied prediction. binary paramet...

The thermophysical properties of a refrigerant can be modified via adding metal organic frameworks (MOF) to it. Understanding the adsorption–diffusion process mixture in MOFs at molecular level is important further improve efficiency Rankine cycle. adsorption and diffusion R32/R1234yf MOF-200 was investigated by dynamics simulation present work. results show that number adsorbed molecules R32 p...