scholarly journals Daylight and Architectural Simulation of the Egebjerg School (Denmark): Sustainable Features of a New Type of Skylight

2019 ◽  
Vol 11 (21) ◽  
pp. 5878 ◽  
Author(s):  
Cabeza-Lainez ◽  
Almodovar-Melendo ◽  
Dominguez
Keyword(s):  
Solar Energy ◽  
Reciprocity Theorem ◽  
Simulation Tool ◽  
Environmental Aspects ◽  
Educational Facilities ◽  
Simulation Data ◽  
Architectural Elements ◽  
New Type ◽  
Architectural Simulation ◽  
And Diffusion

This article discusses the performance of a new skylight for standard classrooms at the Egebjerg School (Denmark), which was built ca. 1970. This building underwent important reforms under a European project to which the authors contributed. This research aimed to create a new skylight prototype that is useful for several schools in the vicinity, since there is a lack of educational facilities. The former skylights consisted of plastic pyramids that presented serious disadvantages in terms of sustainability matters. During the design process, the priority changed to studying the factors that correlate daylighting with energy and other environmental aspects in a holistic and evocative approach. Accordingly, the new skylight features promote the admittance and diffusion of solar energy through adroit guidance systems. In order to simulate different scenarios, we employed our own simulation tool, Diana X. This research-oriented software works with the effects of direct solar energy that are mostly avoided in conventional programs. By virtue of Lambert’s reciprocity theorem, our procedure, which was based on innovative equations of radiative transfer, converts the energy received by diffusive surfaces into luminous exitance for all types of architectural elements. Upon completion of the skylights, we recorded onsite measurements, which roughly coincided with the simulation data. Thus, conditions throughout the year improved.

System Identification of TEG Themostatic System

2014 ◽  
Vol 551 ◽  
pp. 384-388 ◽  
Author(s):  
Dong Jing Yang ◽  
Jin Wu Gao ◽  
Le Lun Jiang ◽  
Tan Xiao
Keyword(s):  
System Identification ◽  
Control Strategy ◽  
Measuring Instrument ◽  
Analysis Method ◽  
Simulation Data ◽  
Arx Model ◽  
Data Matching ◽  
New Type ◽  
Matching Degree ◽  
Lower Temperature

Thrombelastograph device (TEG) is a measuring instrument of blood viscoelastic properties during coagulation. The measuring temperature of TEG is fixed at 37oC while in some surgery cases, lower temperature surroundings may be adopted. Therefore a new type of TEG with a controllable themostatic system has been designed to mimic various temperature surroundings in surgery. In this paper, a small-sized high accuracy thermostatic system for TEG was designed and its system identification was built to facilitate the development of control strategy. ARX model was supposed to analyze the system identification of the thermostatic system by Matlab System Identification Toolbox. Residual analysis method was adopted to verify the identified model. The results showed that the simulation data of ARX model was consistence with the measured data (matching degree was about 93%). Transfer function of the system can be applied to develop its control strategy.

scholarly journals Hybrid Microencapsulated Phase-Change Material and Carbon Nanotube Suspensions toward Solar Energy Conversion and Storage

Energies ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 4401
Author(s):  
Jun Li ◽  
Lisi Jia ◽  
Longjian Li ◽  
Zehang Huang ◽  
Ying Chen
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Solar Energy ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Microencapsulated Phase Change Material ◽  
Energy Conversion And Storage ◽  
New Type ◽  
And Storage ◽  
Change Material

In this study, a new type of functional hybrid suspension for solar energy conversion and thermal energy storage was prepared by adding carbon nanotube (CNT) and microencapsulated phase-change material (MEPCM) into deionized water. MEPCM with octadecane as the core material and titania (TiO2) as the shell material was synthesized by the sol–gel method. The MEPCMs were spherical particles with diameters of 2–4 μm, and the thickness of the shell was about 100 nm. The MEPCM achieved better thermal stability and thermal conductivity than the pure octadecane due to the TiO2 shell. The melting and solidification latent heats of the MEPCM were about 154.24 and 154.26 J/g, respectively. The encapsulation efficiency of octadecane was calculated to be 65.84%. Most of all, the novel hybrid CNT and MEPCM suspensions exhibited remarkable dispersion stability owing to the stable reticular structure composed of CNT in the suspension. Compared with pure water, the thermal conductivity, specific heat of the MEPCM/CNT suspension improved by 34.48 and 43.57%, respectively and the photo-thermal conversion efficiency reached a high value of 86.0%. This work provided a new type of hybrid functional suspension towards direct absorption solar collector for solar energy conversion and storage.

Research on Mode of Solar Automatic Tracker

2013 ◽  
Vol 724-725 ◽  
pp. 78-83
Author(s):  
Zhong Ying Yuan
Keyword(s):  
Sustainable Development ◽  
Solar Energy ◽  
Trajectory Tracking ◽  
Utilization Rate ◽  
The Sun ◽  
Automatic Tracking ◽  
Tracking Mode ◽  
The World ◽  
New Type ◽  
Solar Tracker

Solar energy, as a new type of energy for sustainable development without pollution, has caught much attention all over the world. Adequately improving the utilization rate of solar illumination is taken as the only means of using solar energy in maximum. This paper introduces two different tracking modes of the solar tracker which can switch automatically: Sensor tracking mode and the sun trajectory tracking mode. These two modes can self-switch and cooperate with each other to achieve high precision of all time automatic tracking.

scholarly journals Bipartite Fuzzy Stochastic Differential Equations with Global Lipschitz Condition

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Marek T. Malinowski
Keyword(s):  
Differential Equations ◽  
Stochastic Differential Equations ◽  
Unique Solution ◽  
Lipschitz Condition ◽  
New Type ◽  
And Diffusion

We introduce and analyze a new type of fuzzy stochastic differential equations. We consider equations with drift and diffusion terms occurring at both sides of equations. Therefore we call them the bipartite fuzzy stochastic differential equations. Under the Lipschitz and boundedness conditions imposed on drifts and diffusions coefficients we prove existence of a unique solution. Then, insensitivity of the solution under small changes of data of equation is examined. Finally, we mention that all results can be repeated for solutions to bipartite set-valued stochastic differential equations.

scholarly journals A literature review on Building Integrated Solar Energy Systems (BI-SES) for façades − photovoltaic, thermal and hybrid systems

2022 ◽  
Vol 7 ◽  
pp. 7
Author(s):  
Karol Bot ◽  
Laura Aelenei ◽  
Maria da Glória Gomes ◽  
Carlos Santos Silva
Keyword(s):  
Systematic Review ◽  
Solar Energy ◽  
Literature Review ◽  
Parametric Analysis ◽  
Energy Systems ◽  
Experimental Simulation ◽  
Simulation Tool ◽  
Strategic Development ◽  
Building Facades ◽  
And Performance

The building façade has a crucial role in acting as the interface between the environment and the indoor ambient, and from an engineering and architecture perspective, in the last years, there has been a growing focus on the strategic development of building façades. In this sense, this work aims to present a literature review for the Building Integrated Solar Energy Systems (BI-SES) for façades, subdivided into three categories: thermal, photovoltaic and hybrid (both thermal and photovoltaic). The methodology used corresponds to a systematic review method. A sample of 75 works was reviewed (16 works on thermal BI-SES, 37 works on photovoltaic BI-SES, 22 works on hybrid BI-SES). This article summarises the works and later classifies them according to the type of study (numerical or experimental), simulation tool, parametric analysis and performance when applied.

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