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Research Article

Performance analysis of a ductless personalized ventilation combined with radiant floor cooling system and displacement ventilation

Jiying Liu1,2( ), Daniel Alejandro Dalgo2, Shengwei Zhu1, Hui Li3, Linhua Zhang3, Jelena Srebric2
School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Key Laboratory of Renewable Energy Utilization Technologies for Buildings, Ministry of Education, Shandong Jianzhu University, Jinan 250101, China
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Abstract

This study conducted the numerical simulation to evaluate the performance of a ductless personalized ventilation (DPV) combined with radiant floor cooling system (RFCS) and displacement ventilation (DV) system. In the non-DPV cases, DV supplies air at temperature of 16 °C and 20 °C, respectively with a flow rate of 2.4 ACH. In the cases with DPV, DPV supplies personalized air, which is drawn at the height of 0.1 m or 0.2 m above the floor, to the face of a seated occupant at flow rates of 3 L/s, 5 L/s and 7 L/s, respectively. The horizontal distance of 0.3 m is designed between DPV air supply opening and occupant face at the height of 1.2m. For all the cases, the floor cooling temperature is set to 20 °C. The vertical air temperature difference at 1.1 m and 0.1 m (ΔT1.1-0.1), the contaminant removal effectiveness (ε) and the draft rate at the occupant face (DRface) are mainly used as evaluation indices to quantify the ventilation effectiveness and thermal comfort effect. According to the results, DPV remarkably decreases ΔT1.1-0.1 with a maximum reduction of 1.79 °C compared to non-DPV case. DPV significantly influences the temperature adjacent to the face at the breathing zone, with a maximum reduction of 4.44 °C from non-DPV case to DPV case. DPV cases also effectively improve ε at breathing region compared to the non-DPV case. The DRface ranges from 9.01% to 21.33% when different flow rates of DPV are used. In summary, the case using DPV flow rate of 5 L/s and at intake height of 0.1 m presented relatively better ventilation effectiveness and thermal comfort environment around the occupant.

Keywords

computational fluid dynamics (CFD)ductless personalized ventilation (DPV)displacement ventilation (DV)radiant floor cooling system (RFCS)

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Building Simulation
Volume 12 Issue 5,
October 2019
Pages 905-919
DOI: 10.1007/s12273-019-0521-9
Cite this article:
Liu J, Dalgo DA, Zhu S, et al. Performance analysis of a ductless personalized ventilation combined with radiant floor cooling system and displacement ventilation. Building Simulation, 2019, 12(5): 905-919. https://doi.org/10.1007/s12273-019-0521-9

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Received: 28 September 2018
Revised: 23 December 2018
Accepted: 28 January 2019
Published: 10 April 2019
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
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