**4. Conclusion**

*Heat Transfer - Design, Experimentation and Applications*

**Lubricant COP COP increase** Polyol ester 1.25 --- Polyol ester +1.5% Cu 1.41 12% Polyol ester+3%Cu 1.31 5%

**158**

**Figure 11.**

*Effect of the 1.5%Cu nano-lubricant on the VCS's COP.*

**Table 2.** *COP improvement.*

**Table 1.**

**Figure 10.**

*VC system to test nano-lubricant effects on COP.*

*Components' technical characteristics.*

Cooling capacity 400W

Refrigerant R449A Charges mass 400gr

Compressor Secop SC12MLX

