• Title/Summary/Keyword: Double evacuated tube-type

Search Result 4, Processing Time 0.018 seconds

Study on Performance Evaluation and Efficiency Comparison for Solar Collector with Thermosyphon Tube-type (태양열집열기의 성능평가 및 열사이폰관형 집열기의 효율 비교 연구)

  • Sim, Han-Sub;Yang, Young-Joon
    • Journal of Energy Engineering
    • /
    • v.23 no.2
    • /
    • pp.175-182
    • /
    • 2014
  • The use of solar energy among renewable energy tends to increase because of infinity and cleanness of resources. Even though the consumption rate of solar energy in our country is still low, however, in recent years, the research for solar energy have been widely conducted due to policy support of government. This study was performed to make the system of performance test for solar collector and to investigate thermal efficiency for solar collector with thermosyphon tube-type. As a result, in case of indoors measurement using halogen lamp, thermal efficiency for solar collector with thermosyphon tube-type was increased about 15~22% after 120 minutes compared with that of solar collector with double evacuated tube-type. In addition, in case of outdoors measurement, thermal efficiency of thermosyphon tube-type was showed maximum about 46% higher than double evacuated tube-type.

Study on the Optical Performance of Evacuated Solar Collectors (진공복사관식 집열기의 성능실측 및 최적화 연구)

  • Chun, Won-Gee;Kang, Sang-Hoon;Kim, Ki-Hong;Lee, Yong-Kuk;Chang, Rae-Woong
    • Journal of the Korean Solar Energy Society
    • /
    • v.21 no.4
    • /
    • pp.63-71
    • /
    • 2001
  • This work has been carried out to find the ideal operating conditions for solar vacuum tube collectors which are widely used at present. Various types of solar collectors including a flat plate one were experimentally tested and examined to determine their thermal efficiencies and operating characteristics. Generally, solar vacuum tubes can be classified into two groups according to their design features. Of these, one is characterized by the insertion of a metallic device(such as a finned heat pipe) in an evacuated glass tube for the collection and transportation of solar energy. The other utilizes double glass tubes where the smaller one is contained inside the bigger one and soldered to each other after the small gap between them is evacuated. Both of these solar collectors are designed to minimize convection heat losses by removing the air which is in direct contact with the absorber surface. The performance of the former type can be readily analyzed by applying the relevant correlations developed for flat plate solar collectors. This has been demonstrated in the present study for the case of a solar collector where a heat pipe is inserted in an evacuated tube.

  • PDF

Study on Thermal Efficiency according to Configuration Change and Contact Resistance of Solar Collector with Single Evacuated Tube-type (단일진공관 태양열집열기의 형상변화 및 접촉저항에 따른 집열효율 연구)

  • Choi, Bo-Won;Yang, Young-Joon
    • Journal of Energy Engineering
    • /
    • v.23 no.4
    • /
    • pp.189-195
    • /
    • 2014
  • The use of solar energy among renewable energy tends to increase because of its infinity and cleanness of resources. Even though the consumption rate of solar energy in our country is still low, however, in recent years, the research for solar energy have been widely conducted due to policy support of government. This study was performed to investigate the efficiency of heat collection using solar collector with single evacuated tube-type. As the results, the temperature of radiation fin for solar collector with single evacuated tube-type was lower in spite of high temperature of heat pipe compared that of double evacuated tube-type. In order to increase the efficiency of heat collection, it was confirmed that the loss of heat collection due to contact resistance as well as performance improvement for solar collector should be decreased.

A Study on the Collector Characteristics of Evacuated Double Glass Tube by Artificial Sun (인공태양에 의한 이중 진공 유리관의 집열특성에 관한 연구)

  • Nam, Yong-Han;Shin, Jae-Ho;Mo, Joung-Gun;Chung, Han-Shik;Jeong, Hyo-Min;Suh, Jeong-Se
    • Proceedings of the KSME Conference
    • /
    • 2003.04a
    • /
    • pp.1542-1547
    • /
    • 2003
  • This paper represents the solar collector performance with type of an evacuate double glass, and a copper tube was installed in center of collector to get a solar thermal energy. The one module of solar collector and artificial sun were used in this experiment The distance between artificial sun and solar collector was fixed at 0.5m, and this experimental condition was focused on winter season. The experiments were carried out. three times for getting a accurate data and the heat amount of one module evacuate d solar collector was estimated at out. 48 kcal/hr.

  • PDF