TY - JOUR
T1 - A new ventilated window with PCM heat exchanger—Performance analysis and design optimization
AU - Hu, Yue
AU - Heiselberg, Per Kvols
PY - 2018
Y1 - 2018
N2 - This paper proposes a ventilated window with a phase change material (PCM) heat exchanger as a new window application. In summer, night ventilation mode is operated to discharge energy stored in PCM by the ambient cold air, which can be reloaded again, when ventilation pre-cooled air is provided. Numerical model is built and verified by full-scale experiment to evaluate the PCM ventilation system. The nonlinear properties and hysteresis of PCM are set in the model. The conclusion is that the configuration optimization should be based on different climates. In the case study in Copenhagen, the heat exchanger with 10 mm plate thickness is optimized. It can cool down the ventilated air 6.5 °C on average in 3.9 h pre-cooling effective time with 3.19 MJ/day energy saving. The material cost saving is 16.87% compared to 20 mm plate thickness which has similar discharged heat amount. Nevertheless, the heat exchanger with 5 mm plate thickness has a faster thermal response and a higher cost saving ability, which is good for the climate when the period of outdoor air temperature suitable for night ventilation in a day is short.
AB - This paper proposes a ventilated window with a phase change material (PCM) heat exchanger as a new window application. In summer, night ventilation mode is operated to discharge energy stored in PCM by the ambient cold air, which can be reloaded again, when ventilation pre-cooled air is provided. Numerical model is built and verified by full-scale experiment to evaluate the PCM ventilation system. The nonlinear properties and hysteresis of PCM are set in the model. The conclusion is that the configuration optimization should be based on different climates. In the case study in Copenhagen, the heat exchanger with 10 mm plate thickness is optimized. It can cool down the ventilated air 6.5 °C on average in 3.9 h pre-cooling effective time with 3.19 MJ/day energy saving. The material cost saving is 16.87% compared to 20 mm plate thickness which has similar discharged heat amount. Nevertheless, the heat exchanger with 5 mm plate thickness has a faster thermal response and a higher cost saving ability, which is good for the climate when the period of outdoor air temperature suitable for night ventilation in a day is short.
KW - PCM modeling
KW - Phase change material
KW - Ventilated window
KW - Ventilation pretreatment
KW - PCM modeling
KW - Phase change material
KW - Ventilated window
KW - Ventilation pretreatment
UR - http://www.scopus.com/inward/record.url?scp=85044991970&partnerID=8YFLogxK
U2 - 10.1016/j.enbuild.2018.03.060
DO - 10.1016/j.enbuild.2018.03.060
M3 - Journal article
AN - SCOPUS:85044991970
SN - 0378-7788
VL - 169
SP - 185
EP - 194
JO - Energy and Buildings
JF - Energy and Buildings
ER -