Hydrogen-Evolving CNT-Photocatalysts for Effective Use of Solar Energy

2018 ◽  
pp. 205-218
Author(s):  
Yutaka Takaguchi ◽  
Tomoyuki Tajima ◽  
Hideaki Miyake
Keyword(s):  
Solar Energy ◽  
Effective Use

scholarly journals Fluidyne Heat Engine Construction and Performance

1969 ◽  
Vol 69 (1) ◽  
pp. 45-55
Author(s):  
Y. Shahabasi
Keyword(s):  
Puerto Rico ◽  
Solar Energy ◽  
Fossil Fuels ◽  
Low Cost ◽  
Heat Engine ◽  
Rapid Rate ◽  
The World ◽  
Engine Construction ◽  
And Performance ◽  
Effective Use

Strictly speaking, all forms of energy are derived from the sun. However, our most common forms of energy, fossil-fuels, received their solar input eons ago and have changed their characteristics so that they are now in concentrated form. It is apparent that these stored concentrated energy forms are now being used at such a rapid rate that they will be depleted in the not-toodistant future. It would be useful to utilize the incoming solar energy directly. The effective use of the sun's energy in agriculture by any economically possible means will help the farmers continue their work with no disruption because of the lack of concentrated form of energy. The fluidyne heat engine utilizes solar energy to pump water. The simplicity, reliability, and low cost of this engine are of primary importance for the farmers in the part of the world whereas solar energy is abundant such as Puerto Rico.

H2-evolving SWCNT Photocatalysts for Effective Use of Solar Energy

2017 ◽  
Vol 1 ◽  
Author(s):  
Kiki Kurniawan ◽  
◽  
Noritake Murakami ◽  
Yuto Tango ◽  
Takumi Izawa ◽  
...  
Keyword(s):  
Solar Energy ◽  
Effective Use

scholarly journals CALCULATION OF THE INSTANT MODEL OF SOLAR RADIATION DISTRIBUTION ON CURVED SURFACES IN HIGH-RISE BUILDINGS

2020 ◽  
pp. 3-12
Author(s):  
Olga Krivenko ◽  
Peter Kulikov ◽  
Andrey Zaprivoda ◽  
Vitaliy Zaprivoda
Keyword(s):  
Decision Making ◽  
Solar Radiation ◽  
Solar Energy ◽  
Surface Shape ◽  
Design Parameters ◽  
Curved Surfaces ◽  
Hyperbolic Paraboloid ◽  
Solar Systems ◽  
High Rise ◽  
Effective Use

The aim of research is to simulate the zones of solar radiation on the curved surfaces of the shells of high-rise buildings for the effective use of renewable solar energy. An urgent task is the development of tools that can substantiate the decision-making by designers about the location of solar thermal devices in the energy-efficient design of curvilinear high-rise buildings. The main attention is paid to high-rise buildings, is actively growing in modern megalopolises and requires a significant energy resource. To optimize the integration of solar thermal devices in high-rise buildings, it is important to take into account a set of design parameters, including parameters of surface shape and location in space. A feature of curved surfaces, considered in the study, is their aerodynamic properties, which provide them with the advantage of choosing among modern high-rise buildings. At the same time, the complexity of setting the parameters of a curved surface to determine the zones of solar radiation for the effective use of regenerative solar energy lies in providing reliable and convenient tools for optimizing decision-making. The study proposes an application of the method based on a discrete geometric model of solar radiation input on the surface of the shells of high-rise buildings, described by compartments of curved geometric surfaces. As a result of modeling, let’s obtain a family of lines of the same level of solar radiation on a certain curved surface for the given parameters of time and geographic location. As an example of simulation modeling, the performed calculations of the instantaneous model of the distribution of solar radiation on the compartments of the curved surfaces of an ellipsoid of revolution, hemisphere, hyperbolic paraboloid. On the basis of the proposed model for the distribution of solar radiation over curvilinear surfaces of buildings, the influence of factors arising in the design process is investigated: changes in the geometric parameters of the surface shape, orientation to the cardinal points, the formation of zones of its own shadow on surfaces. Calculations were performed and instantaneous solar radiation zones were constructed on the surfaces of a hemisphere, a hyperbolic paraboloid with various geometric parameters, taking into account different orientations relative to the cardinal points, and determining the zones of its own shadow. At this stage of the study, the result is an algorithm for constructing zones of different levels of solar radiation on curved surfaces of high-rise buildings. The advantage of the algorithm is the ability to analyze the results of changes in the design parameters of the surface of a high-rise building when placing solar systems on them. The proposed approach will provide a basis for automating the modeling process, will help expand the scope of solar systems in high-rise construction and increase the efficiency of their work

Solar Tri-Generation: New Concept of Solar Energy System

Solar Energy ◽  
2003 ◽  
Author(s):  
Tadayoshi Tanaka ◽  
Yuji Ando ◽  
Masatsugu Amano
Keyword(s):  
Solar Energy ◽  
Fossil Fuel ◽  
Energy Resource ◽  
Photovoltaic Cell ◽  
Energy System ◽  
Energy Resources ◽  
System Structure ◽  
Co2 Emission Reduction ◽  
Simplified Analysis ◽  
Effective Use

It is general that each of the heat and electricity is individually supplied even if their resources are the same. However, from the viewpoint of the effective use of energy resources, development of co-generation producing both of them is promoted. To enhance more the utilization of energy resources, it is considered to supply three different types of energy from one energy resource. This is a basic concept of tri-generation and we named it first in the world. Tri-generation we proposed supplies heat, electricity and fuel. By this definition, we can easily understand that tri-generation is realized by utilizing solar energy. Therefore, we call it solar tri-generation. In this paper, the methods of system structure and the feature of solar tri-generation are described and we conducted a simplified analysis to make clear the effectiveness of solar tri-generation in the comparison of effective use of solar energy with a solar co-generation consisting of photovoltaic cell modules and photovoltaic/thermal modules. Furthermore, from the viewpoint of CO2 emission reduction, we conducted a simplified analysis to make clear the characteristics of energy consumption in the three systems of a fossil fuel fired co-generation and, a solar co-generation and a tri-generation with fossil fuel fired co-generation.

scholarly journals Field experiment on flow stabilization of working fluid in a top-heat-type thermosyphon

2021 ◽  
Vol 897 (1) ◽  
pp. 012007
Author(s):  
K Maruyama ◽  
T Kawaguchi ◽  
T Fujisawa ◽  
T Kawashima
Keyword(s):  
Solar Energy ◽  
Field Experiments ◽  
Hot Water ◽  
Working Fluid ◽  
Intermittent Flow ◽  
Damage And Failure ◽  
Flow Stabilization ◽  
External Power Source ◽  
Water Field ◽  
Effective Use

Abstract To address the problem of global warming, increasing efforts are being made to use renewable sources of energy, such as solar energy, wind energy, and geothermal energy. However, the effective use remains a major challenge for its sustainable development. In this study, we used a top-heat-type thermosyphon to heat water using solar energy and transport the low-density hot water from the source to the sink (high to low elevation) without an external power source. The transported hot water can be used for cooking, bathing, underfloor heating, and heating homes and buildings, and warming cold springs. However, a disadvantage of top-heat-type thermosyphon is the intermittent flow of the circulating working fluid under low solar radiation. To address this issue, the authors proposed and developed a control system to stabilize the intermittent flow and prevent equipment damage and failure due to the sudden boiling of water. Field experiments were conducted to assess the practicability of the developed controller. The results showed that the controller efficiently converted the intermittent flow of working fluid to continuous flow by reducing the pressure in the buffer chamber and thus lowering the boiling point of the working fluid in the header of the solar collector.

Discussion on Integrated Design of the Solar Energy Application and Solar Shading of Buildings

2014 ◽  
Vol 507 ◽  
pp. 492-496
Author(s):  
Yan Qiu Cui ◽  
Chun Lei Liu ◽  
Cai Ling Luo
Keyword(s):  
Solar Energy ◽  
System Design ◽  
Integrated Design ◽  
Solar Module ◽  
Module Design ◽  
Solar Energy Application ◽  
Solar Shading ◽  
Energy Application ◽  
Save Energy ◽  
Effective Use

Solar energy application combined with solar shading of buildings can not only take advantage of solar energy initiatively, but also save energy passively. By analyzing the strategy and integrated design methods of combination between solar energy application and shading system design, combining the geographical position of construction and solar radiation, this paper rationally design the arrangement of solar module, discuss the methods how to combine solar system with roof, facade window as well as superficial sun-shading of buildings, so that it could propose on making effective use of solar module design, which has dual efficacy, promoting the integration of solar energy application and shading system design.

scholarly journals CALCULATION OF THE INSTANT MODEL OF SOLAR RADIATION DISTRIBUTION ON CURVED SURFACES IN HIGH-RISE BUILDINGS

2020 ◽  
pp. 3-12
Author(s):  
Olga Krivenko ◽  
Peter Kulikov ◽  
Andrey Zaprivoda ◽  
Vitaliy Zaprivoda
Keyword(s):  
Decision Making ◽  
Solar Radiation ◽  
Solar Energy ◽  
Surface Shape ◽  
Design Parameters ◽  
Curved Surfaces ◽  
Hyperbolic Paraboloid ◽  
Solar Systems ◽  
High Rise ◽  
Effective Use

The aim of research is to simulate the zones of solar radiation on the curved surfaces of the shells of high-rise buildings for the effective use of renewable solar energy. An urgent task is the development of tools that can substantiate the decision-making by designers about the location of solar thermal devices in the energy-efficient design of curvilinear high-rise buildings. The main attention is paid to high-rise buildings, is actively growing in modern megalopolises and requires a significant energy resource. To optimize the integration of solar thermal devices in high-rise buildings, it is important to take into account a set of design parameters, including parameters of surface shape and location in space. A feature of curved surfaces, considered in the study, is their aerodynamic properties, which provide them with the advantage of choosing among modern high-rise buildings. At the same time, the complexity of setting the parameters of a curved surface to determine the zones of solar radiation for the effective use of regenerative solar energy lies in providing reliable and convenient tools for optimizing decision-making. The study proposes an application of the method based on a discrete geometric model of solar radiation input on the surface of the shells of high-rise buildings, described by compartments of curved geometric surfaces. As a result of modeling, let’s obtain a family of lines of the same level of solar radiation on a certain curved surface for the given parameters of time and geographic location. As an example of simulation modeling, the performed calculations of the instantaneous model of the distribution of solar radiation on the compartments of the curved surfaces of an ellipsoid of revolution, hemisphere, hyperbolic paraboloid. On the basis of the proposed model for the distribution of solar radiation over curvilinear surfaces of buildings, the influence of factors arising in the design process is investigated: changes in the geometric parameters of the surface shape, orientation to the cardinal points, the formation of zones of its own shadow on surfaces. Calculations were performed and instantaneous solar radiation zones were constructed on the surfaces of a hemisphere, a hyperbolic paraboloid with various geometric parameters, taking into account different orientations relative to the cardinal points, and determining the zones of its own shadow. At this stage of the study, the result is an algorithm for constructing zones of different levels of solar radiation on curved surfaces of high-rise buildings. The advantage of the algorithm is the ability to analyze the results of changes in the design parameters of the surface of a high-rise building when placing solar systems on them. The proposed approach will provide a basis for automating the modeling process, will help expand the scope of solar systems in high-rise construction and increase the efficiency of their work

scholarly journals Results of theoretical studies of the adaptation of the solar power complex of the south of the Tyumen region

2021 ◽  
Vol 49 (Special) ◽  
pp. 7-7
Author(s):  
Boris Zherebtsov ◽  
◽  
Ekaterina Basumatorova
Keyword(s):  
Solar Energy ◽  
Structural Changes ◽  
Operating Conditions ◽  
Technical Solution ◽  
The South ◽  
Negative Effects ◽  
Energy Complex ◽  
Calculation Results ◽  
Power Complex ◽  
Effective Use

Theoretical provisions of the adaptation of the solar energy complex for effective use in the climate of the south of the Tyumen region. In particular, the climate in the south of the Tyumen region has been studied, its main features are described, and the main difficulties in using this system in the region have been deduced. Methods for calculating the parameters of the power complex are presented, structural changes in the design of the heat exchanger are provided, taking into account the operating conditions, a technical solution has been developed for the design of the structure of the power complex in order to minimize the negative effects of the external environment, a method is given for testing the effectiveness of the proposed solutions, the heat transfer fluids used in system, taking into account the specifics of a particular project. Keywords: ADAPTATION, SOLAR ENERGY COMPLEX, CALCULATION, RESULTS, RESEARCH, ANALYSIS, HEAT EXCHANGE, HEAT, STEAM, TEMPERATURE, POWER, CYCLE, AREA

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