• Title/Summary/Keyword: Unused thermal energy

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Study on Evaluation Method of Thermal Potential of Unused Energy (미활용에너지의 열 포텐셜 평가 수법에 관한 연구)

  • Chung, Yong-Hyun
    • Journal of Environmental Science International
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    • v.15 no.5
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    • pp.493-501
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    • 2006
  • The increase in environmental loads and energy consumptions has resulted in the need of developed new forms of energy for a sustainable use for the society. Recently, the viability of using unused energy has attracted a great deal of attention. From the view point of using unused energy, the most critical problem can be referred to as the distance between the heat source/sink and heat demand area. The water resource in the city water system was used to solve this distance problem with unused energy. The calculation method of the potential use unit was used to survey the potential of the water resource in the city water system. The amount of theoretical unused energy and energy savings in the model city were estimated using this method. It is estimated that the amounts of energy savings and $CO_2$ reduction correspond to 131.3 GWh and 29280[t-C], respectively, per annual basis.

An Estimation of Quantity of Unused Energy of River Water, Seawater and Treated Sewage as Heat Source and Its Availability in Large Facilities (대규모 시설에서 이용가능한 미활용 에너지의 부존량과 그 이용 가능성에 관한 조사연구-하천수.해수.하수처리수를 중심으로)

  • Heo, Jae-Yeong
    • Journal of National Security and Military Science
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    • s.1
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    • pp.423-446
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    • 2003
  • While the demand for energy has shown a sharp increase recently, the supply seems to be limited by the fact that the conventional fossil fuel energy or nuclear energy has its own environmental problems such as, for example, global warming or nuclear waste disposal. To overcome such limited supply of energy, the utilization of natural thermal energy such as river water and seawater as well as treated sewage can be a substantial supplement. The potential use of the unused energy has become more and more feasible these days as the heat pump technology has been advanced. In the present study, the unused energy resources are estimated on regional and monthly basis for each resource by the method proposed here in order to establish the fundamental data for its utilization. The potential use of the unused energy is a1so discussed.

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Evaluation on Thermal Potential of Tap Water, Rain Water, Waste Water as City Water System (도시 수자원으로서의 상수.우수, 하수에 대한 열적 포텐셜의 평가)

  • ;大阪大學
    • Journal of environmental and Sanitary engineering
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    • v.13 no.2
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    • pp.26-33
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    • 1998
  • It has been referred as a problem that heat source/sink is distance from heat demand area in using unused energy. To solve the distance problem in using unused energy, the water from city water system like tap water, rain water, waste water used as unused energy. To survey the potential of the water of city water system, it is developed that the calculation method of the potential using unit method. The amount of theoretical unused energy and energy saving in the Osaka City, Japan were estimated by using that method.

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An Investigation on Quantity of Unused Energy Using Temperature Difference Energy as Heat Source and Its Availability (온도차에너지를 열원으로 하는 미활용에너지의 부존량과 이용가능성에 관한 조사연구)

  • 박준택;장기창
    • Journal of Energy Engineering
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    • v.11 no.2
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    • pp.106-113
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    • 2002
  • While the demand for energy has shown a sharp increase recently, the supply seems to be limited by the fact that the conventional fossil fuel energy or nuclear energy has its own environmental problems such as, for example, global warming or nuclear waste disposal. To overcome such limited supply of energy, the utilization of natural thermal energy such as river water and sea water as well as treated sewage can be a substantial supplement. The potential use of the unused energy has become more and more feasible these days as the heat pump technology has been advanced. In the present study, the unused energy reserves are estimated on regional and monthly basis for each resource based on the method developed here in order to establish the base data for its utilization. The potential use of the unused energy is also discussed.

Binary Power plant using unused thermal energy and Neural Network Controllers (미활용 열에너지를 이용한 바이너리 발전과 신경망 제어)

  • Han, Kun-Young;Park, Sung-Dae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.10
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    • pp.1302-1309
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    • 2021
  • Recently, the Korean Government announced the Korean New Deal as a national development strategy to overcome the economic recession from the pandemic crisis and lead the global action against structural changes. In the Korean New Deal, the Green New Deal related with the energy aims to achieve net-zero emissions and accelerates the transition towards a low-carbon and green economy. To this end, the government plans to promote an increased use of renewable energy in the society at large. This paper introduces a binary power generation using unused low-grade thermal energy to accelerate the transition towards a low-carbon and green economy and examines a control system based on Neural Network which is capable maintenance at low-cost by an unmanned automated operation in actual power generation environment. It is expected that the realization of binary power generation accelerates introduction of renewable energy along with solar and wind power.

Compact Binary Power plant using unused thermal energy and Neural Network Controllers (미이용 열에너지를 이용한 소형 바이너리 발전과 신경망 제어기)

  • Han, Kun-Young;Jeong, Seok-Chan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.05a
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    • pp.557-560
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    • 2021
  • In the face of the COVID-19 pandemic, the Korean Government announced the Korean New Deal as a national development strategy to overcome the economic recession from the pandemic crisis and lead the global action aginst sturctural changes. The Green New Deal related with the energy aims to achieve net-zero emissions and accelerates the transition towards a low-carbon and green economy. To this end, the government plans to promete an increased use of renewable energy in the the society at large. This paper introduces a compact-binary power plant using unused thermal energy and a control system based on Neural Network in order to accelerate the transition towards a low-carbon and green economy. It is expected that he compact-binary power plant accelerate introduction of renewable energy along with solar and wind power.

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A study on the utilization of exhausted heat from subway for energy source of heat pump (공기열원 히트펌프의 에너지원으로서 지하철 배열 이용에 관한 연구)

  • Kim J.R.;Jeong K.C.
    • Journal of the Korean Institute of Gas
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    • v.4 no.4 s.12
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    • pp.13-19
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    • 2000
  • Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was performed as follows The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying.

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Research on using the exhausted heat from subway tunnel as unused energy (미활용 에너지원으로서의 지하철 배열이용에 관한 연구)

  • 김종렬;금종수;최광환;윤정인;박준택;김동규;김보철;정용현
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.6
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    • pp.695-701
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    • 1998
  • Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was peformed as follows. The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying. The results are summarized as follows; 1) Forced ventilation should be conducted to keep optimal temperature in subway tunnel in summer as well as in winter. According to the simulation, temperature in tunnel was higher than that on the ground in summer when the forced ventilation was conducted only in winter. 2) Ventilating time should be calculated out to the optimal condition for not only saving power of ventilation fan but reusing exhausted heat. By the simulation, it is certain that the exhausted heat should be eliminated in air-conditioning time. 3) The use of exhausted heat source heat pump could save 8% of electric power per hour in comparison with existing heat pump. It was based on a present heat generation and traffic for ventilating time of general air-conditioning, but could be different by ventilating time. 4) As the traffic increases up to 1.5 or 2 times, electric power consumption of the conventional heat pump increases to 11% or 13.5% per mean hour in comparison with that of the exhausted heat source heat pump, though all-day ventilation.

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High-efficiency Agricultural Heater and Smart Control System Utilizing Heat Pipe (히트파이프를 활용한 농업용 고효율난방기 및 스마트 제어시스템)

  • Kim, Eung-Kon;Lim, Chang-Gyoon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.6
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    • pp.1151-1158
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    • 2017
  • The Effluent Heat Pipe integral with the heater is a device that recreates unused thermal energy from the plant in winter, and thus reuses unused energy before releasing the exhaust heat. Through the establishment of facility horticulture and glass greenhouses, we identified the problems of our agricultural heaters, and we proposed efficient agricultural efficiency and smart control systems for optimum agricultural efficiency and smart house.

Effects of Pipe Network Materials and Distance on Unused Energy Source System Performance for Large-scale Horticulture Facilities (배관 재질 및 길이에 따른 대규모 시설원예단지용 미활용 에너지 시스템의 성능 평가)

  • Lee, Jae-Ho;Yoon, Yeo-Beom;Hyun, In-Tak;Lee, Kwang Ho
    • KIEAE Journal
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    • v.14 no.4
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    • pp.119-125
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    • 2014
  • This study investigated the effects of pipe network materials and distance on system performance utilizing unused energy sources in large-scale horticulture facility. For this, the modeling was performed with a 100 m long and 100 m wide rectangular shaped glass house having an area of 1ha ($10,000m^2$) using EnergyPlus software. The heat sources considered were air source, geothermal heat, power plant waste heat, sea water heat, and river water. The temperature variation of the fluid with regard to pipe material and distance from the heat source and the resultant heat pump electricity consumptions were calculated. It turned out that the fluid temperature reaching the heat pump increased as the distance from the heat source increased in case of sea water and river water, which have higher temperatures than the surrounding soil, improving the heat pump efficiency. It was vice versa in case of the power plant waste heat. In addition, pipe material of PVC showed the smallest effect on the system performance variation due to the lowest thermal conductivity, compared to PB and HDPE.