Theoretical investigation of the use of nanorefrigerants in various refrigeration cycles

Refrigerant mixtures which the composition of a pure refrigerant and nanoparticles are named nanorefrigerants. Most studies on nanorefrigerants have indicated that adding nanoparticles in pure refrigerant increases heat transfer coefficient, thermal conductivity, refrigeration capacity, and decreases compressor work and energy waste. In this thesis, a prediction model was developed to guess COP of the nanorefrigerant and applied to vapour-compression refrigeration cycles of nanorefrigerants consisted from R12, R134a, R430a, R436a, R600a and R22, R290, R410a, R431a, R507a as base fluid and Al2O3 nanoparticles. Alteration in COP was investigated while nanoparticles added to pure refrigerant for various evaporating temperatures and various condensation temperatures by calculating densities and achieving enthalpies of nanorefrigerants on the points of vapour-compression refrigeration cycle. The results pointed that COP enhances with adding nanoparticle to pure refrigerant.