• Title/Summary/Keyword: Solar city

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Optimal Operation Methods of the Seasonal Solar Borehole Thermal Energy Storage System for Heating of a Greenhouse (온실난방을 위한 태양열 지중 계간축열시스템의 최적 운전 방안)

  • Kim, Wonuk;Kim, Yong-Ki
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.1
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    • pp.28-34
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    • 2019
  • Solar energy is one of the most abundant renewable energy sources on Earth but there are restrictions on the use of solar thermal energy due to the time-discrepancy between the solar-rich season and heating demand. In Europe and Canada, a seasonal solar thermal energy storage (SSTES), which stores the abundant solar heat in the summer and uses the heat for the winter heating load, is used. Recently, SSTES has been introduced in Korea and empirical studies are actively underway. In this study, a $2,000m^2$ flat plate type solar collector and $20,000m^2$ of borehole thermal energy storage (BTES) were studied for a greenhouse in Hwaseong City, which has a heating load of 2,164 GJ/year. To predict the dynamic performance of the system over time, it was simulated using the TRNSYS 18 program, and the solar fraction of the system with the control conditions was investigated. As a result, the solar BTES system proposed in this study showed an average solar fraction of approximately 60% for 5 years when differential temperature control was applied to both collecting solar thermal energy and discharging BTES. The proposed system simplified the configuration and control method of the solar BTES system and secured its performance.

A study on the Estimation of Standard Heating City Gas Consumption of Apartment Housing (공동주택의 난방용 도시가스 표준사용량 산정에 관한 연구)

  • Shim, Yun-Hee;Choi, Chang-Ho;Lee, Hyun-Woo
    • Journal of the Korean Solar Energy Society
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    • v.26 no.3
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    • pp.89-97
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    • 2006
  • Our Housing culture continuously changes for the correspondence to social development and changes of economy, and be developing. A massive apartment complex continuously increased, and According to this in our country heating energy consumption of a residential building is continuously increasing at country me whom was limited in order to raise efficient residential land use and diffusion ratio of house. If confirm an element to be able to reduce use of a heating energy, and there is saving possibility to parts of energy saving, this study will present the standard amount used with bases to the gas amount used for heating and Field Test data about room temperature. Execute simulation with building balance (public area, a plain), the gas amount useds such as incense of a building, indoor setting temperature ($^{\circ}C$), a position of an apartment house etc. to affect the energy amount used of a valuation object building of a variable through Field Test and research on the actual condition. Calculate the standard amount used of city gas for winter season heating of a comparative analysis apartment house to data value getting the above results through Field Test and simulations with bases.

Effect of channel hight on Bubble growth under Saturated Nucleate Pool Boiling for Various Channel Height using Heater with Artificial Cavity (인공 캐비티를 가진 히터를 이용한 가열면의 채널 높이가 풀비등시 기포성장에 미치는 영향에 대한 기초연구)

  • Kim, Jeong-Bae;Park, Moon-Hee;Jeon, Woo-Cheol
    • Journal of the Korean Solar Energy Society
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    • v.30 no.5
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    • pp.93-99
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    • 2010
  • Nucleate pool boiling experiments with constant heat flux condition were performed using pure R113 for various channel heights under saturated pool condition. A circular heater of 1mm diameter, with artificial cavity in the center, fabricated using MEMS technique and the high-speed controller were used to maintain the constant heat flux. Images of bubble growth were taken at 5,000 frames per second using a high-speed CCD camera. The bubble geometry was obtained from the captured bubble images. The effects of channel height on the bubble growth behaviors were analyzed as dimensional scales for the initial and thermal growth regions. The parameters for the bubble growth behaviors were bubble radius, bubble growth rate, and bubble shapes. These phenomena require further analysis for various surface angles, but this study will provide good experimental data with constant heat flux boundary condition for such works.

Investigation of Problem and System by Energy Application in City Level (도시차원에서의 에너지 적용에 따른 문제점 및 체계 검토)

  • Park, Yool;Kim, Sam-Uel;Park, Jin-Young;Lee, Sang-Jin;Yee, Jurng-Jae
    • Journal of the Korean Solar Energy Society
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    • v.29 no.3
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    • pp.51-58
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    • 2009
  • Recently, many social, economical and political problems have occurred in the field of urban energy supply because of the depletion of fossil fuels and the international climate change agreements and the current energy-related laws focus on individual buildings which makes them difficult to implement. Also, the policies for energy savings have increased day by day, but it is difficult to establish efficient urban plan because of lack of integrated policies and institutions. Current legal systems for urban plan does not cover domestic and international climate change agreements, energy related industry's structural changes and other environmental problems such as embodied energy and global warming. This paper tries to investigate current conditions of legal system to provide fundamental materials for improving energy conservation in urban plan.

Application of Sun Control Devices and Energy Conservation (Theory and Practice) (주광제어 장치를 이용한 건물의 에너지 절약(이론 및 실제))

  • Han, Hyun-Joo;Cho, Yil-Sik;Song, In-Choon
    • Solar Energy
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    • v.10 no.2
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    • pp.77-85
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    • 1990
  • In the present analysis, a number of sun control devices are examined for their performance in promoting the interior visual environment. Two exemplary cases are introduced for their excellence in harnessing the concept of daylighting and passive concepts. Of these, the Johnson Controls branch office building in Salt Lake City manifests the effectiveness of light shelves and clerestory windows in implementing these concepts. Distinct optical characteristics are found for overhangs, light shelves, louvers, and blinds as they interfere with the path of sunlight. Substantial amount of energy could be saved if the fundamentals of these devices are truly understood in their application to residential and commercial buildings. Sustained efforts should be made in this regard by the builders, architects, energy consultants, and educators who make contributions in energy management.

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The Application and Evaluation of Heating and Cooling System by Seawater Heat Source for Research Center Building in Jeju (제주지역 연구소 건물의 해수열원 냉난방시스템 적용 및 평가)

  • Park, Jin-Young;Kim, Sam-Uel;Chang, Ki-Chang
    • Journal of the Korean Solar Energy Society
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    • v.33 no.6
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    • pp.26-31
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    • 2013
  • Use of heat from seawater could be different from the weather conditions of a coastal city and seawater temperatures near the city. It will be a good option to use surface layer water with Heat Pump system for using seawater cooling/heating in Jeju. The study investigates the proper depth for seawater heat gain of Jeju area in Korea. Sampling points are 0, 10, 20, 30m from the surface of the Sea. Seawater temperature does not change significantly according to the depth in winter, while the temperature is quite different according to the depth in summer. In this study, it is analyzed to compare existing system and seawater heat source system for target buildings on Jeju. And this systems are calculated a initial cost.

A Study on the Increase of City Temperature in Gwangju by using the of Meteorological Data (기상데이터를 이용한 광주광역시 도시온도 상승에 관한 연구)

  • Park, Seok-Bong
    • Journal of the Korean Solar Energy Society
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    • v.24 no.3
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    • pp.65-71
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    • 2004
  • This study analysed data on the weather of Seoul, Gwangju and Mokpo to examine the degree of temperature increase in those Korean cities. 1) When the results of the analysis were compared with those of previously analysed temperature increase in 1990s and 1940s, there was an increase in temperature of $1.7^{\circ}C$ in Seoul, $1.5^{\circ}C$ in Gwangju and $0.7^{\circ}C$ in Mokpo. 2) According to the seasonal analysis, $1.7^{\circ}C$ in Seoul, $1.5^{\circ}C$ in Gwangju and $0.7^{\circ}C$ in Mokpo increased in Spring. On a monthly basis in Spring increase in April was highest($2.3^{\circ}C$ and $1.0^{\circ}C$ in Gwangju and Mokpo, respectively). As for Seoul, $2.4^{\circ}C$ increased in March, highest. In July and August of Summer, no significant change occurred in the three cities, but in Autumn, $1.0^{\circ}C,\;1.5^{\circ}C$, and $0.3^{\circ}C$ in Seoul, Gwangju and Mokpo increased, respectively. In Winter, $2.9^{\circ}C$ in Seoul, $1.9^{\circ}C$ in Gwangju, and $2.3^{\circ}C$ in Mokpo increased, respectively.

A Study on Urban Energy Planning Process and Planning Support System for a Energy Saving Green City (친환경 도시에너지계획 프로세스 및 계획지원기술에 관한 연구)

  • Yeo, In-Ae;Yoon, Seong-Hwan
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.502-505
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    • 2012
  • This study suggested 'Environmental Friendly City Model' and 'Energy Planning Process' according to the increasing necessity of 'Energy Saving Green City and 3 technologies like (1)Urban Spatial Modeling, (2)Urban Energy Consumption, (3)Urban Energy Supply Planning technologies were suggested which are able to support sustainable urban energy planning'. The results are as follows. (1)E-GIS modeling system was suggested as a 'Planning Supporting System'. (2)Urban Energy Consumption Algorithm was systemized with planning information of E-GIS DB. (3)Urban Energy System Location was deduced by integrating E-GIS DB and ANN algorithm.

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A Study on Economic and Environmental Evaluation of Building Integrated Photovoltaic in Daegu (대구광역시 건축물 적용 태양광발전시스템의 경제성 및 환경성 평가에 관한 연구)

  • Soh, Jae-Eak;Kim, Ju-Young;Hong, Won-Hwa
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.1232-1237
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    • 2006
  • In Daegu, spread works of photovoltaic have were carrying out from a part of the solar city Daegu but, actual results have were insignificant. According to this study, it analyzed actual conditions of four building integrated photovoltaic system proper to the subject of investigation in Daegu City, in order to investigate the cause of inactive spread of building integrated photovoltaic system. After analyzing of actual state and performance, this study will present not only economic evaluation that Is problem of spread but also, environment evaluation by estimating to have an effect on greenhouse gas reduction.

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Attenuation of the Atmospheric Aerosol Transmissivity due to Air Pollution (대기오염에 의한 대기투과도 감쇠에 대한 연구)

  • Kim, Yoo-Keun;Lee, Hwa-Woon;Lee, Yong-Seob
    • Journal of Korean Society for Atmospheric Environment
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    • v.11 no.E
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    • pp.23-29
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    • 1995
  • Relationship between atmospheric aerosol transmissivity and air pollution was analyzed using observed data in a large industrial city, Pusan, Korea. The atmospheric aerosol transmissivity predicted by method of present study in Pusan was assessed by the method of Yamamoto et al.(1968) in order to set up an empirical model to predict the transmissivity using the various meteorological parameters and air pollution. As a result, good correlation between these tow method re observed. Thus, it is possible to conclude that the parameterization of air pollution suggested by this study is another method to give reliable estimate of atmospheric aerosol transmissivity and direct solar irradiance in Pusan.

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