• Title/Summary/Keyword: Solar Heat Energy

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Study on the Latent Heat Storage of Solar Energy for Greenhouse Heating (Greenhouse 보온(保溫)을 위한 태양(太陽)에너지 잠열축열(潛熱蓄熱) 연구(硏究))

  • Song, H.K.;Tyu, Y.S.
    • Journal of Biosystems Engineering
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    • v.16 no.4
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    • pp.399-407
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    • 1991
  • In Korea, the cultivation area under the plastic greenhouse was 1,746 ha in 1975, and 36,656 ha in 1989, it shows that the greenhouse cultivation area was increased by 21 times during last 14 years. The greenhouse cultivation area of 90~93% has been kept warm with double layers of plastic film and thermal curtain knitted with rice straw, and the rest area of 7~10% has been heated by fossil fuel energy. The use of rice straw thermal curtain is inconvenient to put it on and off, on the other hand the use of fossil fuel heating system results in the increase of production cost. To solve these problems, at first the heating load and the storable solar energy in greenhouse during the winter season were predicted to design solar utilization system, secondly a solar thermal storage system filled with latent heat storage materials was developed in this study. And then finally the thermal performance of greenhouse-solar energy storage system was analyzed theoretically and experimentally.

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A Study on the characteristic solar heat system with season (태양열시스템의 계절에 따른 온수급탕에 관한 운전특성연구)

  • Shin, Young-Shik;Jung, Sung-Chan;Cha, In-Su;Choi, Jeong-Sik
    • 한국태양에너지학회:학술대회논문집
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    • 2009.04a
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    • pp.199-202
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    • 2009
  • Domestic new recycling energy supply is on the way in various form and capacity locally through the support of governmen aid. Among these, solar energy supply is the most in scale and facility. In this paper, we intended to analysis the characteristics of solar energy operation system with season.

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Thermal Characteristics of Hybrid Solar Receiver using a Solar and Combustion heating (태양열과 가스 연소열을 적용한 복합 태양열 흡수기의 열특성 연구)

  • Kang, Myeong-Cheol;Kim, Jin-Soo;Kang, Yong-Heack;Yoon, Hwan-Ki;Yu, Chang-Kyun;Lee, Sang-Nam
    • New & Renewable Energy
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    • v.2 no.4 s.8
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    • pp.33-38
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    • 2006
  • The Dish/Stirling system with the Stirling engine is currently used to convert solar energy directly to electrical energy. Successful operation of dish/Stirling system is supported by hybrid system, which will allow continuous operation driven by solar and combustion heating. The hybrid Receiver has to be provided with an additional combustion system. The heat pipe receiver and conbustion system were manufactured and tested for thermal characteristics of receiver. Maximum temperature difference along the heat pipe surface is $200^{\circ}C$. Emission measurements showed low NOx values of 28 to 46 ppm and very high CO values of 18 to 201 ppm.

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Thermal Characteristics of a Solar and Gas-fired Receiver (태양열과 가스 연소열을 복합 적용한 흡수기의 열특성 연구)

  • Kang, Myeong-Cheol;Kim, Jin-Soo;Kang, Yong-Heack;Yoon, Hwan-Ki;Yu, Chang-Kyun;Lee, Sang-Nam
    • 한국신재생에너지학회:학술대회논문집
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    • 2006.11a
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    • pp.157-160
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    • 2006
  • The Dish/Stirling system with the Stirling engine is currently used to convert solar energy directly to electrical energy successful operation of dish/Stirling system is supported by hybrid system, which will allow continuous operation driven by solar and combustion heat ins. The hybrid Receiver has to be provided with an additional combustion system. The heat pipe receiver and conbustion system were manufactured and tested for thermal characteristics of receiver. Maximum temperature difference along the heat pipe surface is $200^{\circ}C$. Emission measurements showed low NOx values of 28 to 46 ppm and very high CO values of 18 to 201 ppm.

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Performance Evaluation of Hybrid Solar Air-Water Heater when the Heated Air is used as Inlet Air during Air and Water is Heated Simultaneously (가열 공기 유입에 따른 복합형 태양열 가열기 공기-물 제조 성능에 관한 연구)

  • Choi, Hwi-Ung;Yoon, Jung-In;Son, Chang-Hyo;Choi, Kwang-Hwan
    • Journal of the Korean Solar Energy Society
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    • v.35 no.5
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    • pp.21-29
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    • 2015
  • In this study, the performance of hybrid solar air-water heater when the heated air was used as inlet air was investigated during air and liquid were heated simultaneously. Temperature difference between inlet air and ambient was set as $0^{\circ}C$, $13^{\circ}C$ and $22^{\circ}C$ and it was maintained during the daily operation. As a result, thermal efficiency of liquid heating was increased when the inlet air temperature was increased and heat gain of the water in heat storage tank was also increased with increment of temperature difference between inlet air and ambient temperature. On the contrary to this, the decrement of air heating efficiency and total efficiency of collector was confirmed with increment of inlet air temperature and it is considered that heat gain of liquid side is lower than heat loss of air side that occurring by using heated air as inlet air of collector. So, from these results, maximum temperature that the liquid in heat storage tank can reach was expected to increase if the return air or any heated air was used as inlet air. But air and total efficiency of hybrid solar air-water is decreased, so using outdoor air as inlet air is considered as better way on perspective of using of solar thermal energy by hybrid solar collector. However, it is hard to conclude that using outdoor air is better than heated air on the perspective of energy saving of building because the performance of heat storage performance was increased even air and total thermal efficiency was decreased, so the necessity of more profound consideration about these result in further research was confirmed for putting the hybrid solar air-water heater to practical use.

Development of Adsorption Desalination System Utilizing Silica-gel (실리카겔을 이용한 흡착식 담수화 시스템의 기초연구)

  • Hyun, Jun-Ho;Kim, Yeong-Min;Jung, Jin-Ho;Lee, Yoon-Joon;Chun, Won-Gee
    • 한국태양에너지학회:학술대회논문집
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    • 2011.04a
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    • pp.204-209
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    • 2011
  • According to the environment report of UN, korea was classified as potable water shortage countries. Approximately 71% of the Earth's surface is covered by ocean. However, it is difficult to use for industry of residential purpose without a certain processing. The development of solar and waste-heat used absorption desalination technology have been examined as a viable option for supplying clean energy. In this study, the modelling of the main devices for solar and waste-heat used and adsorption desalination system was introduced. The design is divided into three parts. First, the evaporator for the vaporization of the top water is designed, and then the reactor for the adsorption and release of the steam is designed, followed by the condenser for the condensation of the fresh water is designed. In addition, new features based on the energy balance are also included to design absorption desalination system. In this basicresearch, One-bed(reactor) adsorption desalination plant that employ a low-temperature solar and waste energy was proposed and experimentally studied. The specific water yield is measured experimentally with respect to the time controlling parameters such as heat source temperatures, coolant temperatures, system switching and half-cycle operational times.

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Evaluation on Performance of Hybrid Heating System with Solar Collector of Thermosyphon Tube Type (열사이폰관형 태양열집열기를 주열원으로 하는 하이브리드 난방시스템 성능 평가)

  • Chun, Tae-Kyu;Yang, Young-Joon
    • Journal of Energy Engineering
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    • v.21 no.4
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    • pp.356-361
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    • 2012
  • Recently, even though the researches on renewable energy like geothermal, wind, solar energy have been performed widely, its use-rate in total energy is still low. This study was carried out to investigate the performance of hybrid heating system, which consisted of solar collector of thermosyphon tube type and X-L pipe boiler. Especially, new type of solar collector was tried and compared with double tube type and, futhermore, performance and safety on X-L pipe boiler were investigated. As the results, efficiency of solar collector of thermosyphon tube type was higher 20.7% than that of double tube type, mainly due to its structural characteristics. It was also confirmed that temperature of special heat medium used X-L pipe boiler rose up about 20% rapidly in comparison with that of pure water.

Comparison assessment of semi-transparent solar cell for BIPV windows (반투과형 태양전지를 이용한 창호형 BIPV 건물의 환경성능 분석)

  • Chung, Min Hee
    • Land and Housing Review
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    • v.11 no.1
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    • pp.87-94
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    • 2020
  • To implement the planning of zero-energy buildings, their energy performance must be improved, and renewable energy applications must also be included. To accelerate the use of renewable energies in such buildings, BIPVs should be actively used in windows and on roofs. Window-type BIPVs are being developed in various forms depending on the size, composition, area ratio of the window, specification of glass, and so on. To analyze the applicability of various solar cells as window-type BIPVs, in this study, we evaluated their applicability, at the current development level, by analyzing the indoor illuminance, heat gain and heat loss; the cooling, heating, and lighting energy levels; and the generation performance of the various solar cells. To enhance the future applicability of window type BIPV, we analyze the overall energy performance of the building, according to changes in visible light transmittance and generation efficiency. The main research results are as follows. The area ratios above the standard illuminance, based on the window type and according to the VLT, were in order of low-e glazing, a-Si window, DSSC window, and c-Si window. The heat gain of the semi-transparent solar cell winodw was remarkably low. The energy consumption of buildings was highest in the order of c-Si window, DSSC window, a-Si window, and clear low-e window. However, in the case of including the power generation performance of the solar cell, the energy consumption was found to be high in order of DSSC window, c-Si window, a-Si window, and clear low-e window. In the future, if a window-type BIPV is developed, we believe that improvement in power generation performance and improvement in visible light transmittance will be needed.

A Study on the Heat-Storage/-Release Characteristics of a Regenerative Heat Exchanger Utilizing the Reversible Thermochemical Reaction of $Ca(OH)_2/CaO$ ($Ca(OH)_2/CaO$ 계의 가역 열화학 반응열을 이용한 축열식 열교환기의 축열 및 방열특성에 관한 연구)

  • Lee, Soo-Kag;Kim, Hong-Jea;Lee, Jin-Kook
    • Solar Energy
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    • v.9 no.2
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    • pp.22-30
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    • 1989
  • Since the energy storage method by means of the thermochemical reaction has no heat loss by separating the reactants under the storage period, it is remarked as one of promising means particularly for long-term heat storage. In this study, the heat-storage/-release characteristics of the reversible chemical reaction cycle, $Ca(OH)_2/CaO$, is numerically analysed by a mathematical modelling. As a result, the effectiveness of the heat exchanger by the chemical heat storage method is considerably higher than that by the sensible heat storage method. It is found that the major parameters, which determines the effectiveness of the heat exchanger, are the mass flow rate and inlet temperature of fluid, the residence time, etc.. The heat-storage/-release period can be controlled by changing the operation conditions. It is expected that the results obtained here will supply useful informations in designing a regenerative heat exchanger utilizing the thermochemical reaction.

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A Study on the Change in Energy Performance of the Domestic Building by the Isolation-heat Paint (차열도료 적용을 통한 국내 건축물의 에너지 성능 변화에 관한 연구)

  • Choi, Doo-Sung;Chun, Hung-Chan;Cho, Kyun-Hyong
    • Journal of the Korean Solar Energy Society
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    • v.31 no.5
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    • pp.33-40
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    • 2011
  • In this study, it is quantitatively analyzed for thermal Characteristics of isolation-heat paint which has been supplied to a domestic market through experiments and simulations. In the case of experiment using the container box, it shows 8% decrease on cooling energy consumption in a summer season, but shows increase on heating energy consumption. As a result, the analysis has found increase of energy consumption. As a result of holding simulations with meteorological data of domestic major cities, it shows an increase of energy consumption in domestic condition, and it is hard to expect an energy saving from the isolation-heat paint unless greater air-conditioning load.