Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Enhancement of Solar Thermal Storage Tank with Heat Exchange Coils (Part 2 : Simulation)

열교환코일 내장형 태양열 축열조의 성능향상 (제2보 시뮬레이션)

  • Kim, Jong-Hyun (Department of Mechanical Engineering, Graduate School of Kyung Hee University) ;
  • Li, LongJie (Department of Mechanical Engineering, Graduate School of Kyung Hee University) ;
  • Lee, Uk-Jae (Department of Mechanical Engineering, Graduate School of Kyung Hee University) ;
  • Hong, Hiki (Department of Mechanical Engineering, Kyung Hee University)
  • 김종현 (경희대학교 대학원 기계공학과) ;
  • 이용걸 (경희대학교 대학원 기계공학과) ;
  • 이욱재 (경희대학교 대학원 기계공학과) ;
  • 홍희기 (경희대학교 기계공학과)
  • Received : 2016.07.22
  • Accepted : 2016.08.14
  • Published : 2016.09.10
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Abstract

As an alternative of well-mixed storage tank with lower coil only, we have proposed a tank with lower and upper coils and verified a superior thermal stratification in a tank, which results in increased collector efficiency and solar fraction. But the phenomenon of temperature reversal was often experimentally observed in the tank, so a revised control was successfully applied which is to heat only lower coil using three way valve if temperature reversal occurs and to operate the collector with low flow rate when the condition of solar radiation is not good. In the present study, using TRNSYS we compared the existing lower heating and the proposed lower and upper heating with a control preventing temperature reversal. The results showed that the proposed method has an increase of collector efficiency by 5.1% and solar fraction by 3.2%.

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References

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