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Abstract
The ability of nano-refrigerants to enhance the thermo-hydraulic properties of refrigerants, achieved the curiosity of researchers to contribute their useful efforts in this era. The involvement of ultrafine sized particle (1-100 nm) of metal oxide in a conventional refrigerant as a colloidal solution is recognized as a nano-refrigerant. The CuO nano-particle is considered for the comparison of specific heat. This nano-particle is applied in different refrigerants R11, R12, R22, R134a and R141b at volumetric concentration 1%-5%. The evaporator conditions are selected with temperature range of 190K-269K at a constant pressure of 0.3 MPa. The database for the properties of refrigerant at different temperature and pressure has been collected from National Institute of Standards & Technology (NIST). Pak and Cho[10] correlation is used for the calculation of specific heat. The specific heat indicated a negative variation with the addition of nano-particles and rises with the gain in temperature. The addition of the nano-particle has also shown the enhancement in thermal conductivity, density and viscosity of the refrigerant.