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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Solar Energy Society
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Journal DOI :
The Korean Solar Energy Society
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Volume & Issues
Volume 36, Issue 4 - Aug 2016
Volume 36, Issue 3 - Jun 2016
Volume 36, Issue 2 - Apr 2016
Volume 36, Issue 1 - Feb 2016
Selecting the target year
A Study on Preliminary Architectural Orientation Design Methodologies for Sustainability
Lim, Ki-Taek ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 1~7
DOI : 10.7836/kses.2016.36.3.001
The objective of this study is to present and to analyze preliminary orientation design factors in the design stage of sustainable architecture in the viewpoint of technocentrism. Typically people interpret solar energy system architecture as simply being part of a mechanical system. Yet, even before considering energy-consuming physical systems in buildings, it is very important to consider the outer parameters of sustainable design factors and the design process itself for the effective and suitable energy-saving design methodology. By analyzing the evolving phases and history of technocentrism and solar energy systems in sustainable architecture through examples and case studies, this paper focuses on and proposes preliminary orientation design factors that should be considered when starting the architectural design process in the viewpoint of technocentrism.
Micro-Mechanical Approach for Spanwise Periodically and Heterogeneously Beam-like Structures
Lee, Chang-Yong ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 9~16
DOI : 10.7836/kses.2016.36.3.009
This paper discusses a refined model for investigating the micro-mechanical behavior of beam-like structures, which are composed of various elastic moduli and complex geometries varying through the cross-section directions and are also periodically-repeated and heterogeneous along the axial direction. Following the previous work (Lee and Yu, 2011), the original three-dimensional static problem is first formulated in a unified and compact form using the concept of decomposition of the rotation tensor. Taking advantage of the smallness of the cross-sectional dimension-to-length parameter and the micro-to-macro heterogeneity, while also performing homogenization along the dimensional reduction simultaneously, the variational asymptotic method is rigorously used to construct a total energy function, which is asymptotically correct up to the second order. Furthermore, through the transformation procedure based on the pure kinematic relations and the linearized equilibrium equations, a generalized Timoshenko model is systematically established. For the purpose of dealing with realistic and complex geometries and constituent materials at the microscopic level, this present approach is incorporated into a commercial analysis package. A few examples available in literature are used to demonstrate the consistency and efficiency of this proposed model, especially for the structures, in which the effects of transverse shear deformations are significant.
A Study on the POE-based Energy Utilization Satisfaction Analysis for Passive House in Germany
Chung, Hae Jo ; Kim, Sooyong ; Yang, Jinkook ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 17~23
DOI : 10.7836/kses.2016.36.3.017
Passive House represents energy-saving technologies. It aims to save energy and provide comfort to the dwellers. The design and construction began in Germany, where it is commonly observed. In South Korea, implementation of the Passive House concept is difficult because of high construction costs and technological problems. This study performed a POE analysis to analyze the extents of satisfaction and knowledge about Passive House among those who live in them in Germany. The results found high satisfaction with functional aspects, such as ventilation, windows, doors, and the thermal bridge. These research results will provide application criteria for Passive House construction in South Korea.
A Study on the Contact Characteristics of Metal Ring Joint Gaskets
Lee, Min-Young ; Kim, Byung-Tak ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 25~31
DOI : 10.7836/kses.2016.36.3.025
Gaskets are usually used for the sealing of flange joints. The joint is usually composed of two flanges, a ring gasket and clamping bolts. The metal ring gasket is suitable for pipe flanges, pumps and valve joints in high temperature and high pressure environments. A very high surface stress is developed between a ring type joint gasket and the flange groove when the ring type joint is bolted up in a flange. The dimensions of flanges and ring joint gaskets for the pipe sizes that are in common use are specified in the ANSI codes. However, sometimes it is necessary to make a new design for the flange joint which is not specified in the codes, as the equipment is getting larger and larger in size. This paper presents the contact behavior of Class 600 ring joint gaskets with oval and octagonal cross sections. Five different sizes of gaskets are employed in the analysis, and one of them is newly designed on the basis of analysis results obtained from existing models. Three load steps are used to find the stress, stain and contact pressure etc., and to compare the contact characteristics among the models due to the bolt clamping force and the working surface pressure. ANSYS Workbench version15 is used to conduct the finite element analysis.
A Study on Prediction Method of Sky Luminance Distributions for CIE Overcast Sky and CIE Clear Sky
Kim, Chul-Ho ; Kim, Kang-Soo ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 33~43
DOI : 10.7836/kses.2016.36.3.033
Daylight is an important factor which influences building energy efficiency and visual comfort for occupants. It is important to predict precise sky luminance at the early stages of design to reduce light energy in the building. This study predicted sky luminance distributions of standard sky model(CIE overcast sky, CIE clear sky) that was provided from the CIE(Commission internationale de
). Afterward, result of sky luminance was compared and verified with simulation value of Radiance program. From the CIE overcast sky, zenith and horizon ratio is about 3:1. From the CIE clear sky, luminance value gets most high value around the sun. On the other hand, luminance value is the lowest in the opposite direction of the sun when angle is
between the sun and sky element. As a result of comparing the calculation results with Radiance program, sky luminance prediction error rate is 0.4~1.3% when it is CIE overcast sky. Also, sky luminance prediction error rate is 0.3~1.5% when it is CIE clear sky. When compared with the results of radiance simulation, it was evaluated as fairly accurate.
Effect of the Geothermal Heat-pump on alleviation of the Urban Heat Island
Son, Won-Tug ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 45~52
DOI : 10.7836/kses.2016.36.3.045
Remarkable air temperature increases in urban areas are known as heat island phenomenon. In this study, we analyzed the effects of renewable energy on the heat island phenomenon in urban area by numerical method. The results showed that the use of renewable energy reduces the building energy use in urban area and contributes the alleviation of the Urban Heat Island Effects.
Numerical Analysis on Heat Gain of Liquid from Ambient Air with Various Fin Heights and Pitches of Fin-and-Tube Heat Exchanger in Hybrid Solar Collector
Choi, Hwi-Ung ; Fatkhur, Rokhman ; Lyu, Nam-Jin ; Yoon, Jung-In ; Son, Chang-Hyo ; Choi, Kwang-Hwan ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 53~61
DOI : 10.7836/kses.2016.36.3.053
Solar assisted heat pump system uses solar thermal energy as a heat source of evaporator of heat pump. So, COP can be enhanced as well as collector efficiency. For improving performance of this system, some research about hybrid solar collector that has fin-and-tube heat exchanger has been conducted. This collector can get a thermal energy from ambient air for liquid heating, so heated liquid can be used as a heat source of evaporator in heat pump even the solar radiation is not enough. In this study, numerical analysis was conducted for confirming heat gain of liquid according to fin height and pitch of fin-and-tube heat exchanger in collector. As a result, higher heat gain was obtained on lower fin height and narrow fin pitch, but the pressure drop also increased with increment of heat gain. Thus the JF factor considering both heat transfer enhancement and pressure drop was investigated and the maximum value was shown when the fin height and pitch were 40mm and 45mm. So it is considered that this installation condition has a highest heat transfer improvement when comparing with pressure drop. However heat gain of liquid at this condition was less than the other installation conditions of fin pitch on same height. Then, after establishing a proper minimum heat gain of liquid, actual production and experiment of collector will be conducted with fin height and pitch showing maximum JF factor and satisfying selected minimum heat gain of liquid on the basis of results of this study.
Study on Heat Transfer and Fouling of Flow Boiling Systems using Oxidized Graphene Nanofluid
Kim, Woo-Joong ; Kim, Nam-Jin ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 63~74
DOI : 10.7836/kses.2016.36.3.063
The nanofluids are the fluids with excellent thermal property, it is expected as a working fluid of the next generation. The nanofluids are well known that if it is used in the boiling heat transfer system, the critical heat flux is enhanced up to 200%, and the thermal conductivity is increased up to from 10 to 160%. However, the fouling phenomenon can be occurred that nanoparticles of nanofluids are deposited on the heat transfer surface. Therefore, to investigate relation between nanofluid and fouling, this study is carried out using oxidized graphene nanofluid. Also it compared and analyzed the critical heat flux and the boiling heat transfer coefficient. As the result, in case of oxidized graphene deposition for fouling, the critical heat flux is increased up to 20% more than oxdized graphene nanofluid. However, the boiling heat transfer coefficient is decreased down to about
more than pure water.
Market Analysis on Green Building Certification System of the United Korean Peninsula based on the New Building Prediction in North Korea - Focused on Building Energy Conservation Plan, Building Energy Rating Certification, and Green Standard for Energy and Environmental Design (G-SEED) -
Kwak, Young-Hoon ; Shin, Sung-Eun ; Park, Jin-Young ; Do, Hwa-Yong ; Kim, Hea-Jong ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 75~85
DOI : 10.7836/kses.2016.36.3.075
This research aims to predict and analyze green building certification market of Korean Peninsula after unification. First, it analyzes prospected unification time period, then it forecasts number of new residential and non-residential buildings to be constructed based on estimated number of residences in short at the time in North Korea. There exists a good chance that North Korea`s new building market forms similar to that of South Korea, as unification would thoroughly proceed which would result levels of economic culture social politics in quasi-equal state. Thus, assuming the ratio of residential and non-residential building against population is similar in both Korea`s, the number against North Korea`s house supplied population can be estimated. Based on the expected numbers in North Korea, number of proceeded Building Energy Conservation Plan, Building Energy Rating Certification, and Green Standard for Energy and Environmental Design (G-SEED) are predicted. The research shows certification market related to green building in united Korean Peninsula to be \660 billion over 10 years. Not only certifications to newly built buildings but also including existing buildings, this market is to grow to a considerable extent. As this would largely influence eco-constructive materials, energy plant/equipment, and other relevant markets as well, it would require to make thorough preparations. In sum, to stabilize green building market even before the unification, the research proposes the necessities of appropriate systems in consideration of North Korea, through in-depth discussions and establishment of technology and policy directions in green building sector, such as building energy management and emission reduction technology.
Evaluation on the Performance of Design Parameters in Earth Tube System
Hwang, Yong-Ho ; Hwang, Seok-Ho ; Choi, Jeong-Min ;
Journal of the Korean Solar Energy Society, volume 36, issue 3, 2016, Pages 87~94
DOI : 10.7836/kses.2016.36.3.087
Earth tube system can be installed in many ways. However, performance data on earth tube system is still insufficient. Therefore, in this study seven design parameters of earth tube systems were chosen such as underground earth tube length, depth, tube thermal conductivity, thickness, radius, soil conditions, and fan type. And the change effects in the values of the seven parameters on earth tube exit temperatures and heat transfer rate were examined through Energyplus simulations.