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Title: An Experimental Investigation into Performance of a Nanorefrigerant (R134a+CuO) based Domestic Vapour Compression Refrigeration System
Authors: Salman, Qasim Kadhim
Supervisor: Lal, Kundan
Keywords: Copper oxide nanoparticle, nanorefrigerant, thermo-physical properties, freezing capacity, pressure and temperature drop, condenser and evaporator, COP, energy consumption and optimum CuO concentration
Issue Date: 4-Sep-2014
Abstract: The performance of the refrigeration system depends upon the heat transfer characteristics of the refrigerant being used. The present study on an experimental investigation into the performance of a nanorefrigerant (R134a + CuO) based refrigeration system is conducted at the Mechanical Engineering Department, Thapar University, Patiala. Refrigerant, R134a is one of the commonly used refrigerants in many refrigeration applications but it has been observed that its heat transfer characteristics are poor which thereby limits its performance. In our experimental study an attempt has been made to improve its performance by mixing nanoparticles (CuO) into the refrigerant R134a. Copper oxide (CuO) nanoparticles are used to enhancing the heat transfer capacity of R134a refrigerant in the refrigeration system because of its improved thermal conductivity. In these experiment investigations nanofluids are prepared by using CuO as nanoparticles (size 20 nm) in the base fluids which is R134a refrigerant at various concentrations (0.25 % to 2 %) with an increase of 0.25% of volume fraction in each step. Effect of various parameters like heat flux, cooling load in evaporator, mass flow rate of nanorefrigerant (R134a+CuO) with varied volume fraction of CuO nanoparticles in base refrigerantR134a have been investigated. The performance enhancement of a domestic refrigerator is investigated by using CuO nanorefrigerants. It has been observed that the addition CuO of nanoparticles to the R134a refrigerant results in improvements in the thermo-physical properties and heat transfer characteristics of the refrigerant, thereby improving the performance of the refrigeration system. Stable nanorefrigerant (R134a+CuO) has been prepared for the study and the experimental studies indicate that the refrigeration system with nanorefrigerant works normal. The results show that there is a marginal increase in pressure drop up to 2 kpa in both condenser and evaporator. But, there is a significant increase in temperature drop (19%) with increase in volume fraction (1.25%) in condenser side and it is found to be 14 % in evaporator side at same volume fraction at constant heat flux in the evaporator at 35°C. It has been also observed that the freezing capacity of the system is increased by 18.27 % at 1.25 % of volume fraction for 10 LPH of mass flow rate and a 22 % increase is observed at 1.25 % volume fraction at mass flow rate of 15 LHP. Power consumption of the system is found to be reduced by 13 % at volume fraction of 1.25 % and an improvement in COP is by 20 % in comparison to COP of a pure R134a refrigerant. Suitable concentration range of nanoparticles (CuO) for the conducted experimental investigation s is found to be 1-1.25 % for the best results.
Description: ME, MED
Appears in Collections:Masters Theses@MED

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