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On the Ventilation Performance of Low Momentum Confluent Jets Supply Device in a Classroom

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Department of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, Sweden
2
Division of Energy Systems, Department of Management and Engineering, Linköping University, 58183 Linköping, Sweden
*
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5415; https://doi.org/10.3390/en13205415
Received: 8 September 2020 / Revised: 3 October 2020 / Accepted: 13 October 2020 / Published: 16 October 2020
(This article belongs to the Special Issue Sustainable Buildings: Heating, Ventilation and Air-Conditioning)
The performance of three different confluent jets ventilation (CJV) supply devices was evaluated in a classroom environment concerning thermal comfort, indoor air quality (IAQ) and energy efficiency. The CJV supply devices have the acronyms: high-momentum confluent jets (HMCJ), low-momentum confluent jets (LMCJ) and low-momentum confluent jets modified by varying airflow direction (LMCJ-M). A mixing ventilation (MV) slot jet (SJ) supply device was used as a benchmark. Comparisons were made with identical set-up conditions in five cases with different supply temperatures (TS) (16–18 °C), airflow rates (2.2–6.3 ACH) and heat loads (17–47 W/m2). Performances were evaluated based on DR (draft rating), PMV (predicted mean vote), ACE (air change effectiveness) and heat removal effectiveness (HRE). The results show that CJV had higher HRE and IAQ than MV and LMCJ/LMCJ-M had higher ACE than HMCJ. The main effects of lower Ts were higher velocities, DR (HMCJ particularly) and HRE in the occupied zone as well as lower temperatures and PMV-values. HMCJ and LMCJ produce MV conditions at lower airflow rates (<4.2 ACH) and non-uniform conditions at higher airflow rates. LMCJ-M had 7% higher HRE than the other CJV supply devices and produced non-uniform conditions at lower airflow rates (<3.3 ACH). The non-uniform conditions resulted in LMCJ-M having the highest energy efficiency of all devices. View Full-Text
Keywords: experimental investigations; confluent jets ventilation; mixing ventilation; ventilation efficiency; thermal comfort; heat removal effectiveness experimental investigations; confluent jets ventilation; mixing ventilation; ventilation efficiency; thermal comfort; heat removal effectiveness
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MDPI and ACS Style

Andersson, H.; Kabanshi, A.; Cehlin, M.; Moshfegh, B. On the Ventilation Performance of Low Momentum Confluent Jets Supply Device in a Classroom. Energies 2020, 13, 5415.

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