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Title: An Experimantal Investigations into the Performance of Nanorefrigerants (R134a+Al2O3, R134a+SiO2) based Refrigeration System
Authors: Singh, Satnam
Supervisor: Lal, Kundan
Keywords: Aluminum oxide nanoparticles, Silicon oxide nanoparticles, Nanorefrigerant, Thermal conductivity, Cooling Capacity, COP, Energy consumption.
Issue Date: 3-Sep-2014
Abstract: In today’s world refrigeration systems play a vital role to fulfill the human needs and a continuous research is being carried out by many researchers in order to improve the performance of these systems. Here, a such attempt has been made to improve the performance of the system. Our, present study on experimental investigations into the performance of nanorefrigerants (R134a + Al2O3, R134a + SiO2) based refrigeration system, is conducted at the Mechanical Engineering Department, Thapar University, Patiala. The experimental setup is build up according to the national standards of India, and made to function under varying conditions. Performance of the refrigeration system depends upon the various factors like; performance of refrigeration system’s components, nature and properties of the refrigerant being used, environmental conditions etc. During this research work, an attempt has been made to investigate the effect of nanoparticles on the performance of the refrigeration system. After deliberations & discussion it has been decided to use R134a as a base refrigerant which is commonly used refrigerant. But, it has been found that its refrigerant heat transfer capacity is limited and it also consumes more power when taken to refrigeration cycle. In addition to this, choice of a particular refrigerant also effects the temperature across condenser, evaporator of the refrigeration system. Selection of a refrigerant also effects the time taken to reach a particular temperature in the evaporator or freezing capacity. In order to make an improvement in its performance an experimental study has been conducted by using nanorefrigerant rather than the conventional refrigerant. Nanoparticles are injected along with the refrigerant R134a to increase the heat transfer capacity, to reduce the power consumption and there by to increase the performance of the system. Aluminium oxide (Al2O3) & Silicon oxide (SiO2) nanoparticles of size (60-70) nm have been used in the refrigeration system. Two concentrations of nanoparticles have been used. Data is collected for 11 LPH volume flow rate and for two heat fluxes in evaporator 25–26 oC and 35–36 oC. It has been found that addition of aluminium oxide and silicon oxide nanoparticles to the refrigerant results in an improvement in the thermo physical properties and heat transfer characteristics of the refrigeration system. It has been observed that there is more temperature drop across the condenser for the nanorefrigerant (5.47% – 4.83%) compared to refrigerant R134a. Similarly, a gain of (6.89% – 8.08%) has been obtained for evaporator temperature. An improvement in COP is also observed during the investigations (1.17% – 8.40%). This is achieved under 25–26oC evaporator temperature load. Similar improvements are also observed when refrigeration system is operated at 35–36 oC evaporator temperature load. A reduction in the power consumption (10.87% & 13.04%) along with faster cooling (from 40oC – 25oC) is also achieved when nanorefrigerants are used. The experimental studies indicate that the refrigeration system with nano-refrigerant works normal like any conventional refrigeration system. Thus, aluminium oxide and silicon oxide (Al2O3 & SiO2) nanoparticles can be used to improve the performance of a refrigeration system under investigated conditions.
Description: ME, MED
Appears in Collections:Masters Theses@MED

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