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Numerical investigation of the thermal and ventilation performance of a combined impinging jet ventilation and passive chilled beam system
Abstract Impinging jet ventilation (IJV) systems provide high ventilation efficiency and good indoor air quality (IAQ) in the cooling mode. However, they have a limited cooling capacity. Passive chilled beam (PCB) systems are widely used in indoor environments with high cooling loads and can potentially address the limitation of low cooling capacity of IJV. In this study, the possibility of combining IJV and PCB systems is investigated using computational fluid dynamics (CFD) simulations. The effects of two main factors, namely the percentage of cooling load removed by the PCB system (η) and supply air parameters (L m) of the IJV system, on the thermal and ventilation performance of the IJV–PCB system are examined. The results indicate that the PCB system enhances the mixing of indoor air and effectively reduces the vertical temperature gradient in the IJV room. An optimal range of η that improves the cooling capacity and maintains the high ventilation performance of IJV is determined. This range for an IJV–PCB system is 0.15 ≤ η ≤ 0.45, considering thermal comfort, IAQ, and energy saving potential. In addition, the IJV–PCB system offers a wide selection range for L m (0.4–1.2) compared with that of the IJV, and a high ventilation efficiency and good IAQ are maintained in the room in this range.
Highlights Performance of impinging jet ventilation-passive chilled beam (IJV-PCB) is studied. PCB can enhance cooling capacity of the system when maintaining the advantage of IJV. PCB can effectively reduce the vertical temperature gradient in the IJV room. Suitable range of percentage of cooling load removed by PCB is from 0.15 to 0.45. IJV-PCB system has a wide selection range of supply air parameters compared to IJV.
Numerical investigation of the thermal and ventilation performance of a combined impinging jet ventilation and passive chilled beam system
Abstract Impinging jet ventilation (IJV) systems provide high ventilation efficiency and good indoor air quality (IAQ) in the cooling mode. However, they have a limited cooling capacity. Passive chilled beam (PCB) systems are widely used in indoor environments with high cooling loads and can potentially address the limitation of low cooling capacity of IJV. In this study, the possibility of combining IJV and PCB systems is investigated using computational fluid dynamics (CFD) simulations. The effects of two main factors, namely the percentage of cooling load removed by the PCB system (η) and supply air parameters (L m) of the IJV system, on the thermal and ventilation performance of the IJV–PCB system are examined. The results indicate that the PCB system enhances the mixing of indoor air and effectively reduces the vertical temperature gradient in the IJV room. An optimal range of η that improves the cooling capacity and maintains the high ventilation performance of IJV is determined. This range for an IJV–PCB system is 0.15 ≤ η ≤ 0.45, considering thermal comfort, IAQ, and energy saving potential. In addition, the IJV–PCB system offers a wide selection range for L m (0.4–1.2) compared with that of the IJV, and a high ventilation efficiency and good IAQ are maintained in the room in this range.
Highlights Performance of impinging jet ventilation-passive chilled beam (IJV-PCB) is studied. PCB can enhance cooling capacity of the system when maintaining the advantage of IJV. PCB can effectively reduce the vertical temperature gradient in the IJV room. Suitable range of percentage of cooling load removed by PCB is from 0.15 to 0.45. IJV-PCB system has a wide selection range of supply air parameters compared to IJV.
Numerical investigation of the thermal and ventilation performance of a combined impinging jet ventilation and passive chilled beam system
Hu, Jun (author) / Kang, Yanming (author) / Lu, Yihang (author) / Yu, Jia (author) / Li, He (author) / Zhong, Ke (author)
Building and Environment ; 226
2022-10-18
Article (Journal)
Electronic Resource
English
Performance evaluation of impinging jet ventilation combined with ductless personalized ventilation
| DOAJ | 2022