scholarly journals Evaluation of Building Energy Performance with Optimal Control of Movable Shading Device Integrated with PV System

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1799
Author(s):  
Dong Eun Jung ◽  
Chanuk Lee ◽  
Kwang Ho Lee ◽  
Minjae Shin ◽  
Sung Lok Do
Keyword(s):  
Heat Transfer ◽  
Optimal Control ◽  
Solar Radiation ◽  
Radiation Effects ◽  
Radiation Energy ◽  
Energy Performance ◽  
Control Logic ◽  
Pv System ◽  
Cooling Period ◽  
Shading Device

Among the envelope components (e.g., walls, roofs, floors, and windows, etc.) affecting the cooling and heating load of buildings, windows are the most thermally vulnerable. Shading devices can minimize the thermal load on windows due to solar radiation and decrease radiation effects. However, the load changes due to convection and conduction should be considered. Therefore, when a shading device is applied to a window, control logic for thermal blocking and heat retention is necessary to prevent the load changes. In addition, by combining the opposite features of photovoltaic (PV) that require solar radiation and the shading device to block solar radiation, energy-saving and production can be achieved simultaneously. Therefore, this study minimized the thermal effects of windows using a movable shading device integrated with PV and evaluated the PV power generation. This study evaluated the effects on window heat transfer by applying artificial intelligence techniques, which have recently attracted attention, to system operation. To achieve this, artificial neural network (ANN)-based control logic was developed, and the control performance of the system was assessed using simulations. In ANN control, the window heat transfer was 86.3% lower in a cooling period and 9.7% lower in a heating period compared with that of a shading device fixed at 45°. Furthermore, the PV system produced 3.0 to 3.1% more electric power under optimal control during the cooling period.

scholarly journals An analysis of temperature distribution in solar photovoltaic module under various environmental conditions

2018 ◽  
Vol 240 ◽  
pp. 04004 ◽  
Author(s):  
Marek Jaszczur ◽  
Qusay Hassan ◽  
Janusz Teneta ◽  
Ewelina Majewska ◽  
Marcin Zych
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Wind Speed ◽  
Solar Radiation ◽  
Environmental Conditions ◽  
Operating Temperature ◽  
Photovoltaic Module ◽  
Solar Photovoltaic ◽  
System Efficiency ◽  
Pv System

The operating temperature of the photovoltaic module is an important issue because it is directly linked with system efficiency. The objective of this work is to evaluate temperature distribution in the photovoltaic module under different environmental conditions. The results shown that photovoltaic module operating temperature depends not only on the ambient temperature or solar radiation dependent but also depends on wind speed and wind direction. It is presented that the mounting conditions which are not taken into consideration by most of the literature models also play a significant role in heat transfer. Depends on mounting type an increase in module operating temperature in the range 10-15oC was observed which cause further PV system efficiency decrease of about 3.8-6.5 %.

Development of a Computer Model for Solar Simulation and Shaded Fenestration Design

2001 ◽  
Author(s):  
John Kie-Whan Oh ◽  
Jeffrey S. Haberl ◽  
Larry O. Degelman
Keyword(s):  
Heat Transfer ◽  
Solar Radiation ◽  
Computer Model ◽  
Thermal Performance ◽  
Energy Efficient ◽  
Design System ◽  
The Sun ◽  
Physical Test ◽  
Shading Device ◽  
Solar Simulation

Abstract The goal of this study was to develop a computer model for solar radiation calculation and display and a shaded fenestration design system that can be used by architectural and engineering designers. This computerized model calculates the amount of insolation and transmitted solar radiation through a shaded window as well as the heat transfer through it. The computer model, called Shaded Fenestration Design (SFD), contains various functions relating to solar simulation such as: display of the sunpath diagrams and the accompanying shading mask protractor, display of the hourly intensity of solar radiation onto the path of the sun for horizontal and vertical surfaces at varying off-south azimuths, and simulating the thermal performance of a shaded fenestration. The model also provides graphical aids for energy-efficient shading device design with use of various kinds of sunpath diagrams and solar radiation diagrams. The model performs solar radiation simulation using the methods developed in the ASHRAE Handbook, Duffie and Beckman, and Kreider and Rabl. An anisotrophic sky model was applied for the calculation of solar radiation on a titled surface and the transmitted solar radiation through a single-glazed window. A part of the model was validated experimentally using a physical test box and was also compared to simulated results from the DOE-2 program; however, the validation is not included in this paper.

Accounting of Climatic Features in Designing Solar Shading Devices

2018 ◽  
pp. 162-166
Author(s):  
Alexander T. Dvoretsky ◽  
Alexander V. Spiridonov ◽  
Igor L. Shubin ◽  
Ksenia N. Klevets
Keyword(s):  
Solar Radiation ◽  
Russian Federation ◽  
North Caucasus ◽  
Cooling Period ◽  
The North ◽  
Solar Shading ◽  
Federal Districts ◽  
The Russian Federation ◽  
Shading Devices ◽  
Shading Device

Zoning maps of the territory of the Russian Federation on solar radiation and outdoor temperature are given. It should provide for shading of fenestration during the cooling period of buildings, depending on the total amount of solar radiation and the temperature of the outside air. Depending on the amount of solar radiation, five zones are proposed in the territory of the Russian Federation. For each of the five zones, the cooling period of the building is proposed, on which the choice of the parameters of the solar ray daily cone depends on the shape of a solar shading device. A map of isolines of solar radiation for July in the North Caucasus and Southern Federal Districts of the Russian Federation is proposed, which can be used to calculate heat input through fenestration.

scholarly journals Investigation of transient cooling of an automobile cabin with a virtual manikin under solar radiation

2013 ◽  
Vol 17 (2) ◽  
pp. 397-406 ◽  
Author(s):  
Gökhan Sevilgen ◽  
Muhsin Kiliç
Keyword(s):  
Experimental Data ◽  
High Temperature ◽  
Solar Radiation ◽  
Radiation Effects ◽  
Radiation Heat Transfer ◽  
Numerical Data ◽  
Numerical Results ◽  
Surface Radiation ◽  
Cooling Period ◽  
Temperature Distributions

The aim of the paper is to present a three dimensional transient cooling analysis of an automobile cabin with a virtual manikin under solar radiation. In the numerical simulations the velocity and the temperature distributions in the automobile cabin as well as around the human body surfaces were computed during transient cooling period. The surface-to-surface radiation model was used for calculations of radiation heat transfer between the interior surfaces of the automobile cabin and a solar load model that can be used to calculate radiation effects from the sun's rays that enter from the glazing surfaces of the cabin was used for solar radiation effects. Inhomogeneous air flow and non-uniform temperature distributions were obtained in the automobile cabin and, especially in ten minutes of cooling period, high temperature gradients were computed and measured and high temperature values were obtained for the surfaces which were more affected from the sunlight. Validations of the numerical results were performed by comparing numerical data with the experimental data presented in this study. It is shown that the numerical results were good agreement with the experimental data.

Transient thermal analyses of an integrated brake rotor and wheel hub for heavy duty vehicles

2021 ◽  
pp. 095440702110295
Author(s):  
İbrahim Can Güleryüz ◽  
Ziya Haktan Karadeniz
Keyword(s):  
Heat Transfer ◽  
Radiation Effects ◽  
Thermal Analyses ◽  
Convective Heat Transfer Coefficient ◽  
Heavy Duty ◽  
Cooling Period ◽  
Brake Rotor ◽  
Transient Thermal ◽  
Base Design ◽  
Heavy Duty Vehicles

In this study, transient thermal analyses for a new integrated rotor and wheel hub concept are performed by consideration of convection, conduction and radiation effects. Test methods used for the characterization and certification purposes are constructed in a simulation environment and the effect of different ventilation vanes and rotor-hub arrangements on heat transfer mechanism is examined and the details are summarized for a reliable simulation process. Validated procedures are used to report a series of characterization and certification analyses, namely; CFD analyses including wheel assembly, cooldown analyses, R13 repeated stop fade and alpine hot descent analyses for current design and new integrated rotor and hub pair for alternative ventilation vane designs. The analyses are especially focused on predicting the cooling period and predicting maximum bearing temperatures for normal and excessive loading scenarios. To provide benchmark a commercial integrated rotor and hub pair used in heavy duty vehicles is also analysed. The average convective heat transfer coefficient and cooldown period of proposed integrated brake rotor are improved by 117.3% and 30.5% compared to the base design. The maximum wheel bearing temperature is decreased by 27.0% and by 27.1% for the proposed integrated brake rotor and wheel hub compared to the benchmark model, in accordance with the repeated stop and alpine hot descent analyses. In addition, the total weight reduction of 10 kg (15%) according to the base design is achieved.

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