Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Thermal Performance Evaluation of Solar Hot Water System according to Flow Rate Control

유량제어방식에 따른 태양열 급탕시스템의 열성능 평가

  • Received : 2011.09.14
  • Accepted : 2011.10.24
  • Published : 2011.10.30
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Abstract

In this study, the performance and behavior of solar heating system according to the system control scheme, variable flow control (proportional control) and constant flow control (on-off control) was carried out by experiment. The on-off control is used generally for solar thermal system by now. But the proportional control is used for the solar district heating system which is supplied the higher temperature of water than that of desired. The proportional control logic that pump speed is varied in an attempt to maintain a specified outlet temperature of solar heating system was developed and tested for the use widely for the small and medium solar thermal system. The results are as following. First, the proportional controller which is made here could be adopted the characteristics for setting temperature control. Second, the proportional control is better than the on-off control in the side of the performance of thermal stratification in storage tank. Third, the operating energy(electricity consumption by pump) of solar thermal system can be saved more than 60% using the proportional control comparing to the on-off control.

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References

  1. 신우철 외 1인, "차온제어기의 On-Off온도설정에 따른 태양열 시스템 열성능", 태양에너지학회 논문집, pp. 1-8, Vol. 25, No. 2, 2005.
  2. 백남춘 외 4인, "태양열 축열조가 없는 변유량 제어방식의 지역난방용 태양열 시스템 실증실험연구" 태양에너지학회 논문집, pp. 21-27, Vol. 8, No. 5, 2008.
  3. J. A. Duffie, W. A. Beckman, Solar engineering of thermal processes, JONE WILEY & SONS, INC.

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