TY - JOUR
T1 - An experimental study on the starting characteristics of an improved radiant-convective air source heat pump system
AU - Zhang, Long
AU - Dong, Jiankai
AU - Deng, Shiming
AU - Yan, Sen
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - The application of air source heat pump (ASHP), a kind of environmental-friendly energy-saver used for space heating, can help to slow down energy crisis and global warming problems. Recently, to improve the indoor thermal environment, several studies on investigating novel indoor heating terminals of ASHP have been carried out. In this paper, a novel radiant-convective heating terminal was designed and coupled into an ASHP, and its starting characteristics were experimentally investigated. The experimental results showed that both compressor frequency and indoor air fan opening criteria significantly impacted the starting characteristics of the improved ASHP. With an increase in compressor frequency, the values of radiant-convective panel surface temperatures, discharge temperature and pressure, and compressor input power at the end of the starting stages increased, but the suction pressure decreased. Besides, the time point for turning on indoor air fan was prolonged from 100 to 680 s when the temperature of air fan opening criteria increased from 28.0 to 43.0 °C, and the shortest starting time of the improved ASHP occurred when employing the indoor air fan opening criteria of 38.0 °C. Furthermore, an optimized control strategy for the improved ASHP was presented. Compared to a conventional control strategy, the optimized control strategy can significantly shorten the starting time of improved ASHP from 29 to 11 min.
AB - The application of air source heat pump (ASHP), a kind of environmental-friendly energy-saver used for space heating, can help to slow down energy crisis and global warming problems. Recently, to improve the indoor thermal environment, several studies on investigating novel indoor heating terminals of ASHP have been carried out. In this paper, a novel radiant-convective heating terminal was designed and coupled into an ASHP, and its starting characteristics were experimentally investigated. The experimental results showed that both compressor frequency and indoor air fan opening criteria significantly impacted the starting characteristics of the improved ASHP. With an increase in compressor frequency, the values of radiant-convective panel surface temperatures, discharge temperature and pressure, and compressor input power at the end of the starting stages increased, but the suction pressure decreased. Besides, the time point for turning on indoor air fan was prolonged from 100 to 680 s when the temperature of air fan opening criteria increased from 28.0 to 43.0 °C, and the shortest starting time of the improved ASHP occurred when employing the indoor air fan opening criteria of 38.0 °C. Furthermore, an optimized control strategy for the improved ASHP was presented. Compared to a conventional control strategy, the optimized control strategy can significantly shorten the starting time of improved ASHP from 29 to 11 min.
KW - Air source heat pump
KW - Compressor frequency
KW - Convective heating
KW - Radiant heating
KW - Starting characteristic
UR - http://www.scopus.com/inward/record.url?scp=85089440982&partnerID=8YFLogxK
U2 - 10.1016/j.enbuild.2020.110384
DO - 10.1016/j.enbuild.2020.110384
M3 - Article
AN - SCOPUS:85089440982
SN - 0378-7788
VL - 226
JO - Energy and Buildings
JF - Energy and Buildings
M1 - 110384
ER -