Cooling efficiency of a spot-type personalized air-conditioner
Abstract
Here, this study defined Cooling Efficiency (CE) of a Spot-type Personalized Air-Conditioning (SPAC) device as the ratio of the additional sensible heat removal from human body induced by SPAC and the device's cooling capacity. CE enabled the investigation of SPAC performance on the occupant's sensible heat loss (Qs) and thermal sensation by its quantitative relation with the change of PMV level (ΔPMV). Three round nozzles with the diameter of 0.08 m, 0.105 m, and 0.128 m, respectively, discharged air jets at airflow rates from 11.8 L s–1 to 59.0 L s–1, toward the chest of a seated or standing human body with a clothing of 0.48 clo. This study developed a validated CFD model coupled with the Fanger's thermoregulation model, to calculate Qs in a room of 26 °C ventilated at a rate of 3 ACH. According to the results, Qs, CE and draft risk (DR) at face had significant positive linear correlation with the SPAC device's supply airflow rates (R2 >0.96), and a negative linear correlation for ΔPMV. With DR = 20% at face, CE was always under 0.3, and ΔPMV was around -1.0–1.1. Interestingly, both CE and ΔPMV had the least favorable values for the air jet producedmore »
- Publication Date:
- Research Org.:
- Univ. of Maryland, College Park, MD (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- OSTI Identifier:
- 1356328
- Alternate Identifier(s):
- OSTI ID: 1397027
- Grant/Contract Number:
- AR0000530
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Building and Environment
- Additional Journal Information:
- Journal Volume: 121; Journal Issue: C; Journal ID: ISSN 0360-1323
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; spot-type personalized ventilation; computational fluid dynamics; cooling efficiency; draft risk; sensible hear loss; predict mean vote
Citation Formats
Zhu, Shengwei, Dalgo, Daniel, Srebric, Jelena, and Kato, Shinsuke. Cooling efficiency of a spot-type personalized air-conditioner. United States: N. p., 2017.
Web. doi:10.1016/j.buildenv.2017.05.007.
Zhu, Shengwei, Dalgo, Daniel, Srebric, Jelena, & Kato, Shinsuke. Cooling efficiency of a spot-type personalized air-conditioner. United States. https://doi.org/10.1016/j.buildenv.2017.05.007
Zhu, Shengwei, Dalgo, Daniel, Srebric, Jelena, and Kato, Shinsuke. Tue .
"Cooling efficiency of a spot-type personalized air-conditioner". United States. https://doi.org/10.1016/j.buildenv.2017.05.007. https://www.osti.gov/servlets/purl/1356328.
@article{osti_1356328,
title = {Cooling efficiency of a spot-type personalized air-conditioner},
author = {Zhu, Shengwei and Dalgo, Daniel and Srebric, Jelena and Kato, Shinsuke},
abstractNote = {Here, this study defined Cooling Efficiency (CE) of a Spot-type Personalized Air-Conditioning (SPAC) device as the ratio of the additional sensible heat removal from human body induced by SPAC and the device's cooling capacity. CE enabled the investigation of SPAC performance on the occupant's sensible heat loss (Qs) and thermal sensation by its quantitative relation with the change of PMV level (ΔPMV). Three round nozzles with the diameter of 0.08 m, 0.105 m, and 0.128 m, respectively, discharged air jets at airflow rates from 11.8 L s–1 to 59.0 L s–1, toward the chest of a seated or standing human body with a clothing of 0.48 clo. This study developed a validated CFD model coupled with the Fanger's thermoregulation model, to calculate Qs in a room of 26 °C ventilated at a rate of 3 ACH. According to the results, Qs, CE and draft risk (DR) at face had significant positive linear correlation with the SPAC device's supply airflow rates (R2 >0.96), and a negative linear correlation for ΔPMV. With DR = 20% at face, CE was always under 0.3, and ΔPMV was around -1.0–1.1. Interestingly, both CE and ΔPMV had the least favorable values for the air jet produced by the nozzle with the diameter of 0.105 m independent of body posture. In conclusion, although SPAC could lead to additional Qs by sending air at a higher airflow rate from a smaller nozzle, the improvement in cooling efficiency and thermal sensation had a limit due to draft risk.},
doi = {10.1016/j.buildenv.2017.05.007},
journal = {Building and Environment},
number = C,
volume = 121,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Performance analysis of a ductless personalized ventilation combined with radiant floor cooling system and displacement ventilation
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