TY - JOUR
T1 - Selection between single-phase and two-phase evacuated-tube solar water heaters in different climate zones of China
AU - Chow, Tin-Tai
AU - Bai, Yu
AU - Dong, Zhaoting
AU - Fong, Kwong-Fai
PY - 2013/12
Y1 - 2013/12
N2 - Evacuated-tube (ET) solar water heaters are popular in China. Both single-phase and two-phase thermosyphon ET collector systems are available in the market. However, the system energy and economic performance has not been evaluated systematically. In this paper, the numerical evaluation of these two types of solar water heaters in different climate zones of China was reported on the aspects of system energy performance and economical return. The single-phase system is found having better cost payback period in all these cities, and can be a suitable choice except for locations with extreme cold weather. The two-phase design is an attractive and sustainable alternative since its thermal efficiency is higher under the same weather condition and this is important for supporting zero-carbon building design. On the other hand, it can be readily used to enhance the outside appearance of a building. Hence when considering climate adaptability and aesthetic compatibility, the potential of the two-phase system is higher. © 2013 Elsevier Ltd.
AB - Evacuated-tube (ET) solar water heaters are popular in China. Both single-phase and two-phase thermosyphon ET collector systems are available in the market. However, the system energy and economic performance has not been evaluated systematically. In this paper, the numerical evaluation of these two types of solar water heaters in different climate zones of China was reported on the aspects of system energy performance and economical return. The single-phase system is found having better cost payback period in all these cities, and can be a suitable choice except for locations with extreme cold weather. The two-phase design is an attractive and sustainable alternative since its thermal efficiency is higher under the same weather condition and this is important for supporting zero-carbon building design. On the other hand, it can be readily used to enhance the outside appearance of a building. Hence when considering climate adaptability and aesthetic compatibility, the potential of the two-phase system is higher. © 2013 Elsevier Ltd.
KW - Economic payback period
KW - Evacuated-tube collector
KW - Solar water heating
KW - Thermosyphon system
UR - http://www.scopus.com/inward/record.url?scp=84887363339&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84887363339&origin=recordpage
U2 - 10.1016/j.solener.2013.10.011
DO - 10.1016/j.solener.2013.10.011
M3 - RGC 21 - Publication in refereed journal
SN - 0038-092X
VL - 98
SP - 265
EP - 274
JO - Solar Energy
JF - Solar Energy
IS - PC
ER -
