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2. PHD Thesis / Tesis PHD
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Title:	Performance enhancement of grid connected photovoltaic thermal system by nanofluids
Authors:	Ali Najah Kadhim (P67974)
Supervisor:	Kamaruzzaman Sopian, Prof. Dato' Dr.
Keywords:	Nanofluids Photovoltaic power systems
Issue Date:	13-Jan-2017
Description:	Hybrid collector or photovoltaic thermal solar collector (PVT) produces electricity and thermal energy simultaneously. The electricity generated can be connected to grid or be used to operate the fan or pump. The purpose of this study was to design, fabricate and evaluate the performance of photovoltaic thermal (PVT) using three types of nanofluids. Three different absorber designs (round, square and rectangular configurations) with different diameters and different types of nanofluids (SiO2, TiO2 and SiC) have been designed and studied. A three-dimensional Navier–Stokes equation coupled with the Energy balance equation was solved using the computational fluid dynamics (ANSYS-Fluent) software program to perform numerical computations. The theoretical analysis was conducted to determine the optimum design for each configuration and the most suitable base fluid for heat transfer. The experimental setup was constructed using these optimum diameters for each design and were validated using the theoretical results. Each of the collectors was made of round, square and rectangular stainless steel hollow tube and later affixed to bottom of photovoltaic module using silicone gel and after that covered with thermal insulation material fixed inside box to produce complete collector. The two-step method was used to prepare the nanofluids. An ultrasonic device was used to suspend the nanoparticles in the base fluid. Results obtained from the theoretical analysis indicated that the rectangular tube [w=25mm, d=15mm] collector has the best design with SiC nanofluid as the best base fluid for heat transfer. The theoretical results show that the collector with the rectangular tube has the combined PVT efficiency of 82.46% with electrical PVT efficiency of 13.536% at mass flow rate of 0.170 kg/s and solar irradiance of 1000 W/m2. The experimental results show that the nanofluid with Rectangular absorber collector tubes has the highest daily performance and obtained a combined PVT efficiency (76.31-81.61)% with the electrical PVT efficiency (11.72-13.14)% at mass flow rate 0.170 kg/s. From the experimental and theoretical results the rectangular tube nanofluid collector recorded much higher overall efficiency using the best design and optimum nanofluids. A case study on the PVT with nanofluids for grid-connected system with 10 PVT collectors on the top roof house has been conducted. The results indicated that GCPVT system using SiC nanofluid delivered the highest performance compared with grid-connected photovoltaic (GCPV). The average daily PVT module efficiency, system efficiency and inverter efficiency were 13.52%, 13.11% and 96.97%,, respectively. The GCPVT-SiC nanofluid system has been enhanced by 30% in terms of the performance ratio compared with the GCPV system. GCPVT-SiC nanofluid system also exhibited higher energy production, reliability and better conversion of system performance compare with other GCPV system.,Certification of Master's/Doctoral Thesis" is not available
Pages:	231
Call Number:	TK1087.K335 2017 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Solar Energy Research Institute / Institut Penyelidikan Tenaga Suria (SERI)

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