Micro-environmental control for efficient local cooling
Abstract
Micro-environment is hereby defined as the air space and environment around a person that directly impacts his/her thermal sensation. Most existing HVAC systems condition the air of the entire room including the unoccupied space, which leaves a big potential to save energy. This study aims at evaluating the performance of three existing air terminal devices (ATDs) to locally remove enough heat from the micro-environment to manage the thermal balance so as not to sacrifice thermal comfort when the ambient unoccupied space temperature is increased by 2.2 °C from 23.9 °C to 26.1 °C in the summer to reduce the external cooling load. A computational fluid dynamics (CFD) model was developed, validated by full-scale chamber tests and applied to evaluate different configurations of the ATDs for local cooling. Results show that the predicted performance agreed well with the measurements, and the selected ATD, with only 50 W cooling power, was always able to remove a sufficient amount of heat from the microenvironment in a room of raised temperature, when the manikin was moved inside a semicircle movement range. The cooling performance of the jet was increased more by increasing the supply air flow rate than reducing the supply temperature and wasmore »
- Authors:
- Publication Date:
- Research Org.:
- Syracuse Univ., NY (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E)
- OSTI Identifier:
- 1349652
- Alternate Identifier(s):
- OSTI ID: 1397798
- Grant/Contract Number:
- AR0000526
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Building and Environment
- Additional Journal Information:
- Journal Volume: 118; Journal Issue: C; Journal ID: ISSN 0360-1323
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; micro-environment; thermal balance; CFD; local cooling
Citation Formats
Kong, Meng, Dang, Thong Q., Zhang, Jianshun, and Khalifa, H. Ezzat. Micro-environmental control for efficient local cooling. United States: N. p., 2017.
Web. doi:10.1016/j.buildenv.2017.03.040.
Kong, Meng, Dang, Thong Q., Zhang, Jianshun, & Khalifa, H. Ezzat. Micro-environmental control for efficient local cooling. United States. https://doi.org/10.1016/j.buildenv.2017.03.040
Kong, Meng, Dang, Thong Q., Zhang, Jianshun, and Khalifa, H. Ezzat. Thu .
"Micro-environmental control for efficient local cooling". United States. https://doi.org/10.1016/j.buildenv.2017.03.040. https://www.osti.gov/servlets/purl/1349652.
@article{osti_1349652,
title = {Micro-environmental control for efficient local cooling},
author = {Kong, Meng and Dang, Thong Q. and Zhang, Jianshun and Khalifa, H. Ezzat},
abstractNote = {Micro-environment is hereby defined as the air space and environment around a person that directly impacts his/her thermal sensation. Most existing HVAC systems condition the air of the entire room including the unoccupied space, which leaves a big potential to save energy. This study aims at evaluating the performance of three existing air terminal devices (ATDs) to locally remove enough heat from the micro-environment to manage the thermal balance so as not to sacrifice thermal comfort when the ambient unoccupied space temperature is increased by 2.2 °C from 23.9 °C to 26.1 °C in the summer to reduce the external cooling load. A computational fluid dynamics (CFD) model was developed, validated by full-scale chamber tests and applied to evaluate different configurations of the ATDs for local cooling. Results show that the predicted performance agreed well with the measurements, and the selected ATD, with only 50 W cooling power, was always able to remove a sufficient amount of heat from the microenvironment in a room of raised temperature, when the manikin was moved inside a semicircle movement range. The cooling performance of the jet was increased more by increasing the supply air flow rate than reducing the supply temperature and was highly dependent on the shooting angle. Finally, the heat flux from the manikin surface is very sensitive to the surface temperature and furniture placement, and proper specification of the surface temperature is crucial for the CFD simulation to match the measured results.},
doi = {10.1016/j.buildenv.2017.03.040},
journal = {Building and Environment},
number = C,
volume = 118,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}
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