Numerical and experimental investigation of the effect of tilt angle on the performance of PV systems

This paper presents a MATLAB based user friendly software tool called as PV.MY for optimal sizing of photovoltaic (PV) systems. The software has the capabilities of predicting the metrological variables such as solar energy, ambient temperature and wind speed using artificial neural network (ANN), optimizes the PV module/ array tilt angle, optimizes the inverter size and calculate optimal capacities of PV array, battery, wind turbine and diesel generator in hybrid PV systems. The ANN based model for metrological prediction uses four meteorological variables, namely, sun shine ratio, day number and location coordinates. As for PV system sizing, iterative methods are used for determining the optimal sizing of three types of PV systems, which are standalone PV system, hybrid PV/wind system and hybrid PV/diesel generator system. The loss of load probability (LLP) technique is used for optimization in which the energy sources capacities are the variables to be optimized considering very low LLP. As for determining the optimal PV panels tilt angle and inverter size, the Liu and Jordan model for solar energy incident on a tilt surface is used in optimizing the monthly tilt angle, while a model for inverter efficiency curve is used in the optimization of inverter size.

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Simulation About Suitable Direction of Photovoltaic Array for Residential Solar Power Generation System

Solar Energy ◽

10.1115/isec2003-44227 ◽

2003 ◽

Author(s):

Koji Sakai ◽

Osamu Ishihara ◽

Akio Tanaka ◽

Hidetoshi Nakagami ◽

Masaki Manabe

Keyword(s):

Power Generation ◽

Tilt Angle ◽

Generation System ◽

Pv Systems ◽

Photovoltaic Array ◽

Solar Power Generation ◽

Installation Angle ◽

Power Generation System ◽

Pv Power Generation ◽

Fixed System

In this paper, it is attempted in the present study to estimate the factors to reduce power generating efficiency using the results of measurements and to calculate the optimal tilt angle in Kyushu area. Also, the study was made as to how the annual power generation amount is influenced by the deviation of the optimal tilt angle from actual installation angle. We have obtained the results that modeling was performed on the factors to reduce the efficiency obtained from measurements, and PV power generation amount in Kyushu area was estimated. Also, from the results of calculation of the optimal installation angle of the fixed system at installation site, it was demonstrated that the installation of PV systems on roof surface as generally practiced at present did not lead to a greater loss.

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Solar Tilt Angle Optimization of PV Systems for Different Case Studies

EAI Endorsed Transactions on Energy Web ◽

10.4108/eai.13-7-2018.157038 ◽

2019 ◽

Vol 6 (23) ◽

pp. 157038

Author(s):

Hasan Muslim

Keyword(s):

Case Studies ◽

Tilt Angle ◽

Pv Systems

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Experimental Investigation on Operating Limitation of an Oscillating Heat Pipe

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology ◽

10.1115/ht2013-17088 ◽

2013 ◽

Author(s):

Yulong Ji ◽

Chao Chang ◽

Gen Li ◽

Hongbin Ma ◽

Yuqing Sun

Keyword(s):

Experimental Investigation ◽

Heat Pipe ◽

Tilt Angle ◽

Heat Transfer Performance ◽

Input Power ◽

Filling Ratio ◽

Working Fluid ◽

Transfer Performance ◽

Oscillating Heat Pipe ◽

Al2o3 Nanofluid

This research represents an experimental investigation on the operating limitation of an oscillating heat pipe (OHP). The OHP has six turns and three sections: evaporator, condenser and adiabatic sections with lengths of 40 mm, 64 mm and 51 mm, respectively. Water or a mixture of water and alumina (Al2O3) making up a nanofluid served as the working fluid. Filling ratios ranging from 30% to 70%, and tilt angles (orientation) ranging from 0° to 90° were studied. The experimental results showed (1) the water/Al2O3 nanofluid can enhance the OHP heat transfer performance, i.e., the highest input power (operating limitation) increased when the OHP was charged with water/Al2O3 nanofluid; (2) the operating limitation increased as the filling ratio increased from 30% to 70%, but the optimum filling ratio of the OHP is 30% or 50% when the working power is lower or higher; and (3) the thermal resistance of the OHP decreased as the tilt angle increased, and the operating limitation increased as the tilt angle increased.

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