TY - JOUR
T1 - Investigation on thermal-hydraulic performance of outdoor heat exchanger in air sources heat pump
AU - Fang, Zhaosong
AU - Li, Lafang
AU - Cheng, Yong
AU - Wang, Houhua
AU - Oladokun, Majeed Olaide
PY - 2017/6/1
Y1 - 2017/6/1
N2 - A plethora of findings exists on the decreasing heat transfer performance of ASHP under frosting condition. This study investigates, using field and laboratory experiments, the frosting behavior and heat transfer performance of fin-tube exchangers. Findings from our initial observation revealed the severity of frosting phenomenon during winter in hot summer and cold winter zone of China; for avoiding the lower COP, defrosting period of ASHP was not longer than 60 min. The results showed that the basic tube surface temperature decreases with running time and remains stable after 70 min, and an adverse pressure drop ensued. The findings, thereby suggests a 70 min defrosting period in ASHP. Comparing jH/fH and COP between exchangers revealed an improved performance of plain fin-tube exchanger over that of louver fin-tube exchanger in all the test conditions. Therefore, under frosting condition, plain fin-tube heat exchanger provides a superior thermal-hydraulic performance over louver fin-tube heat exchanger. Findings from this study will help designers and facility managers in taking a more informed decision when selecting heat exchanger types for ASHP.
AB - A plethora of findings exists on the decreasing heat transfer performance of ASHP under frosting condition. This study investigates, using field and laboratory experiments, the frosting behavior and heat transfer performance of fin-tube exchangers. Findings from our initial observation revealed the severity of frosting phenomenon during winter in hot summer and cold winter zone of China; for avoiding the lower COP, defrosting period of ASHP was not longer than 60 min. The results showed that the basic tube surface temperature decreases with running time and remains stable after 70 min, and an adverse pressure drop ensued. The findings, thereby suggests a 70 min defrosting period in ASHP. Comparing jH/fH and COP between exchangers revealed an improved performance of plain fin-tube exchanger over that of louver fin-tube exchanger in all the test conditions. Therefore, under frosting condition, plain fin-tube heat exchanger provides a superior thermal-hydraulic performance over louver fin-tube heat exchanger. Findings from this study will help designers and facility managers in taking a more informed decision when selecting heat exchanger types for ASHP.
KW - Comprehensive evaluation
KW - Field and experimental investigation
KW - Fin-tube heat exchanger
KW - Heat transfer performance
UR - http://www.scopus.com/inward/record.url?scp=85011575316&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85011575316&origin=recordpage
U2 - 10.1016/j.expthermflusci.2017.01.008
DO - 10.1016/j.expthermflusci.2017.01.008
M3 - RGC 21 - Publication in refereed journal
SN - 0894-1777
VL - 84
SP - 28
EP - 38
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
ER -