• Title/Summary/Keyword: Cooling&Heating

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Economic Analysis of Cooling-Heating System Using Ground Source Heat in Horticultural Greenhouse (시설원예의 지열냉·난방시스템 경제성 분석)

  • Ryoo, Yeon-Su;Joo, Hye-Jin;Kim, Jin-Wook;Park, Mi-Lan
    • Journal of the Korean Solar Energy Society
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    • v.32 no.6
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    • pp.60-67
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    • 2012
  • Government Geothermal Cooling-Heating Projects has made efforts to reduce GHG(Greenhouse Gas) emissions and to manage cost of greenhouse farm households. This study evaluated the economic benefits of heating load rate of change by comparing Geothermal Cooling-Heating System with the existing system(greenhouse diesel heating) in the Government Geothermal Cooling-Heating Projects. Economic analysis results shows that, 1) When installing the Cooling-Heating system according to the ratio of 70% heating load in policy standards, the geothermal cooling-heating system has economic efficiency with greenhouse type or scale independent because the investment cost is recovered within 7 years. And It was more economic efficiency the ratio of 50% heating load than70% heating load. 2) When installing the Cooling-Heating system according to the glass greenhouse of the ratio of 90% heating load, pay period of investment cost is recovered within 5 years. Therefore it is necessary to apply flexible heating sharing according to greenhouse type or scale.

A Study on the Economic Analysis of Cooling-Heating System Using Ground Source Heat in a public library (공공도서관에 지열시스템 적용시 경제성에 관한 연구)

  • Choi, Chang-Ho
    • Journal of the Korean Solar Energy Society
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    • v.32 no.1
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    • pp.56-66
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    • 2012
  • This study evaluated the economic benefits by comparing Cooling-Heating System with the existing system in the public library. The building's annual energy consumption was measured by adding the figures of the absorber chillers, the air conditioners and heaters in the building. The total amount of annual energy consumption was 143.51RT in air-conditioning and 83.66RT in heating. So, We made the capacity of geothermal heat pumps three 50RTs in order to check up this system. In order to estimate each construction and equipment cost and to evaluate economical efficiency, LCC(Life Cycle Cost) method was used and the service life of the building was sixty years. The result of analysis was that the geothermal cooling-heating system was more efficient than the existing system in public library.

Performance and Heat transfer Characteristics of Louver Fin-tube Heat Exchanger for Simultaneous Cooling/Heating Heat Pump (동시 냉난방 히트펌프용 루버핀-관 열교환기 성능 및 전열특성 실험연구)

  • Kwon, Young-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.6
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    • pp.1337-1342
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    • 2007
  • An experimental study has been performed to investigate the performance and heat transfer characteristics of the heat exchanger for simultaneous cooling/heating heat pump. The heat transfer performance was measured using an air-enthalpy calorimeter and a constant temperature water bath, to obtain the performance evaluation and analysis of a fined tube heat exchanger. Six finned tube heat exchangers with louver fin were tested under a heating condition. Air-side heat transfer and friction were presented in terms of j-factor and f-factor. The heat transfer coefficient increased with decreasing the fin pitch, j-factor and f-factor on the fin pitch and the number of tube rows decreased with increasing Reair.

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A Study on the Application Plan of Air-Conditioning and Renewable Complex Systems in the Small Schools. (소규모 학교의 냉난방 및 신재생에너지복합시스템 적용방안에 관한 연구)

  • Kim, Ji-Yeon;Park, Hyo-Soon;Hong, Sung-Hee;Kim, Seong-Sil;Hur, Inn-Ku;Suh, Seung-Jik
    • Proceedings of the SAREK Conference
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    • pp.946-951
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    • 2009
  • The research aims to study a new, optimum and renewable energy application method that can cover the minimum energy and operation costs within a range of school budgets. By deriving the optimum application method, it is expected to maximize the cooling/heating and water heating energy saving efficiencies for educational facilities. Therefore, this research carried out a study on the new/renewable energy utilization technique diffusion expansion method and the optimum method. As a result, the first optimum plan was introduced with the multi-type geothermal heat pump 174kW + solar heat collector $94\;m^2$ + highly efficient electronic cooling/heating device (EHP) 249.4kW. On the other hand, the second optimum plan was induced as the multi-type geothermal heat pump 255.2kW + highly efficient electronic cooling/heating device (EHP) 168.2kW.

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A Study on the Application Plan of Air-Conditioning and New and Renewable Systems in the Large High Schools (대규모 고등학교의 냉난방 및 신재생에너지시스템 적용방안에 관한 연구)

  • Kim, Ji-Yeon;Park, Hyo-Soon;Kim, Seong-Sil;Suh, Seung-Jik
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.21 no.10
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    • pp.564-574
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    • 2009
  • The study is conducted to study a new, optimum and new and renewable energy application method that can cover the minimum energy and operation costs within a range of school budgets. By deriving the optimum application method, it is expected to maximize the cooling/heating and hot water supply energy saving efficiencies for educational facilities. Therefore, this research implemented a study on the new and renewable energy utilization technique diffusion expansion method and the optimum method. As a result, the first optimum plan was introduced with the multi-type geothermal heat pump 475.6 kW+highly efficient electronic cooling/heating device(EHP) 545.2 kW. On the other hand, the second optimum plan was induced as the multi-type geothermal heat pump 261kW+solar heat collector $240\;m^2$+highly efficient electronic cooling/heating device(EHP) 759.8 kW.

Performance Analysis of Water Direct Contact Air Conditioning System (물 직접접촉식 공기조화장치의 성능해석)

  • Yoo, S.Y.;Kwon, H.K.;Song, J.;Kim, K.Y.;Park, J.T.
    • Proceedings of the KSME Conference
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    • pp.158-163
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    • 2001
  • Performance of the water direct contact air conditioning system, in which heat and mass are transferred directly between air and water droplet, is simulated by semi-empirical method. This system improves transport efficiency compared to conventional indirect contact system and cooling, heating, dehumidification and humidification are attained with one unit. In this study, temperature and flowrate for air and water are measured in the various cooling and heating conditions, and correlations for $h_{c}A/c_{pm}$ are derived from these data. Cooling and heating characteristics of the water direct contact air conditioning system are investigated using correlations.

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Design of an Aquifer Thermal Energy Storage System(II) : Thermal Analysis (지하대수층을 이용한 축열시스템의 설계(II) : 열해석)

  • Lee, K.S.;Lee, T.H.;Song, Y.K.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.6 no.3
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    • pp.315-324
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    • 1994
  • The energy recovery efficiency(ERE) of an aquifer thermal energy storage system was calculated using curvilinear coordinate. The results of the calculation were compared with the experimental results, and agreed within 11% of the discrepancy. The variation of ERE was investigated as a function of the underground water natural velocity, the amount of the stored energy, and period of the energy recovery. The slower the natural velocity and shorter the recovery period, the higher ERE was yielded. Also it was found that increase in the amount of energy storage yields higher ERE, and carries out less influential ERE to the natural velocity. Reiterative usage of the aquifer as a thermal storage tends to gradually increase ERE. The result of this study implements that the aquifer thermal energy storage system is suitable for large cooling/heating loads, such as district cooling/heating.

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Annual Energy Consumption Characteristics of the Geothermal Cooling & Heating System by Types in Public Building (공공건축물에 적용된 지열 냉.난방 시스템의 유형별 연간 에너지 소비특성)

  • Koo, Bon-Kil;Kim, Kang-Min;Hong, Won-Hwa
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.28 no.11
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    • pp.341-348
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    • 2012
  • Nowadays, Due to the recent instability in global oil prices, the convention of climate change, and greenhouse gas emissions, the international regulations on the use of energy, have been strengthened. At this time, energy-saving plan cannot solve the fundamental energy problem. Therefore, it is necessary to diversify the energy supply source by shifting the energy source from fossil energy to renewable energy, as well as practicing energy saving. The purpose of this study the limitations of the geothermal cooling & heating system which is the most close to the practical use in the perspective of initial investment costs and energy efficiency, among renewable energies, were perceived; and to solve this problem, the characteristic of energy consumption of the case in which the geothermal hybrid system, recently being introduced, has been applied, has been carried out.

Cooling-Heating System Using Thermoelectric Module and Parallel Flow Type Pulsating Heat Pipe

  • Kim Jeong-Hoon;Im Yong-Bin;Lee Seong-Ho;Lee Euk-Soo;Kim Jong-Soo
    • International Journal of Air-Conditioning and Refrigeration
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    • v.13 no.4
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    • pp.217-224
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    • 2005
  • The purpose of this study was to develop a cooler/heater using a thermoelectric module combined with a parallel flow type pulsating heat pipe with R-142b as a working fluid. The experiment was performed for 16 thermoelectric modules (6A/15V, size: $40\times40\times4mm$), varying design parameters of the heat pipe (inclination angle, working fluid charging ratio, etc.). Experimental results indicate that the optimum charging ratio and the inclination angle of the parallel flow type pulsating heat pipe were $30\%$ by volume and $30^{\circ}$, respectively. The maximum cooler/heater capacity were 479 W (COP: 0.47) and 630 W (COP: 0.9), respectively.