Experimental investigation of thermal micro-environments and local thermal sensations in enclosed and semi-enclosed localized heating systems

Runnan Lu, Guoqing Yu, Shuang Feng, Hai Ye

Article ID: 9922
Vol 7, Issue 4, 2024

VIEWS - 12 (Abstract) 9 (PDF)

Abstract


Traditional building heating warms entire rooms, often leaving some dissatisfied with uneven warmth. Recently, the personalized heating system has addressed this by providing targeted warmth, enhancing comfort and satisfaction. The personalized heating system in this study is a new enclosed personalized heating system consisting of a semi-enclosed heating box and an insulated chair covered with a thick blanket. The study compares the heating effects of semi-enclosed and enclosed localized heating systems on the body and examined changes in subjects’ thermal sensations. Due to the lower heat loss of the enclosed personalized heating system compared to the semi-enclosed version, it created thermal micro-environments with higher ambient temperatures. The maximum air temperature increase within the enclosed system was twice that of the semi-enclosed system, with the heating film surface temperature rising by up to 6.87 ℃. Additionally, the temperature of the skin could increase by as much as 6.19 ℃, allowing individuals to maintain thermal neutrality even when the room temperature dropped as low as 8 ℃. A two-factor repeated measures analysis of variance revealed differences in temperature sensitivity across various body regions, with the thighs showing a notably higher response under high-power heating conditions. The corrective energy and power requirements of the enclosed personalized heating system also made it more energy-efficient than other personalized heating systems, with a minimum value reaching 6.07 W/K.


Keywords


localized heating system; personalized heating; thermal sensation; personal comfort system; heating box

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References


1. Ruan J, Liu J. Investigation into the thermal comfort and some passive strategies for traditional architecture of Li nationality in South China. Indoor and Built Environment. 2023; 32(7): 1349–1371. doi: 10.1177/1420326x231159888

2. Karjalainen S. Thermal comfort and gender: A literature review. Indoor Air. 2012; 22(2): 96–109. doi: 10.1111/j.1600-0668.2011.00747.x

3. Indraganti M, Rao KD. Effect of age, gender, economic group and tenure on thermal comfort: A field study in residential buildings in hot and dry climate with seasonal variations. Energy and Buildings. 2010; 42(3): 273–281. doi: 10.1016/j.enbuild.2009.09.003

4. Wu X, Liu G, Tian Z, et al. Occupant’s thermal comfort in a radiant ceiling cooling room with hot wall surface. Indoor and Built Environment. 2022; 32(4): 699–718. doi: 10.1177/1420326x221135315

5. van Hoof J. Thermal comfort: research and practice. Frontiers in Bioscience. 2010; 15(1): 765.

6. Zheng J, Yu T, Lei B, et al. Experimental study on the thermal performance of radiant floor heating system with the influence of solar radiation on the local floor surface. Indoor and Built Environment. 2023; 32(5): 977–991. doi: 10.1177/1420326x221148729

7. Wang J, Yu CW, Cao S-J. Planning for sustainable and ecological urban environment: Current trends and future developments. Indoor and Built Environment. 2022; 32(4): 627–631. doi: 10.1177/1420326x221135758

8. Su W, Yang B, Zhou B, et al. A novel convection and radiation combined terminal device: Its impact on occupant thermal comfort and cognitive performance in winter indoor environments. Energy and Buildings. 2021; 246. doi: 10.1016/j.enbuild.2021.111123

9. Wang H, Wang J, Li W, et al. Experimental study on a radiant leg warmer to improve thermal comfort of office workers in winter. Building and Environment. 2022; 207. doi: 10.1016/j.buildenv.2021.108461

10. Liu B, Wang H, Ji K, et al. Using personal comfort systems during the post-heating season in a cold climate: A field study in offices. Case Studies in Thermal Engineering. 2023; 45. doi: 10.1016/j.csite.2023.102974

11. Luo W, Kramer R, de Kort Y, et al. Personal comfort systems and cognitive performance: Effects on subjective measures, cognitive performance, and heart rate measures. Energy and Buildings. 2023; 278. doi: 10.1016/j.enbuild.2022.112617

12. Zhang H, Arens E, Taub M, et al. Using footwarmers in offices for thermal comfort and energy savings. Energy and Buildings. 2015; 104: 233–243. doi: 10.1016/j.enbuild.2015.06.086

13. Yang Z, Zhang W, Liu H, et al. Field study of meeting thermal needs of occupants in old residential buildings in low-temperature environments using personalized local heating. Building and Environment. 2024; 247. doi: 10.1016/j.buildenv.2023.111004

14. Yu G, Gu Z, Yan Z, et al. Investigation and comparison on thermal comfort and energy consumption of four personalized seat heating systems based on heated floor panels. Indoor and Built Environment. 2020; 30(8): 1252–1267. doi: 10.1177/1420326x20939145

15. Ren Z, Gao X, Xiao Y, et al. Thermal comfort and energy conservation of a four-sided enclosed local heating device in a cold environment. Building and Environment. 2023; 228. doi: 10.1016/j.buildenv.2022.109837

16. He Y, Li N, Lu J, et al. Meeting thermal needs of occupants in shared space with an adjustable thermostat and local heating in winter: An experimental study. Energy and Buildings. 2021; 236. doi: 10.1016/j.enbuild.2021.110776

17. Yang B, Wu M, Li Z, et al. Thermal comfort and energy savings of personal comfort systems in low temperature office: A field study. Energy and Buildings. 2022; 270. doi: 10.1016/j.enbuild.2022.112276

18. He Y, Parkinson T, Arens E, et al. Creating alliesthesia in cool environments using personal comfort systems. Building and Environment. 2022; 209. doi: 10.1016/j.buildenv.2021.108642

19. Zhang J, Zhou X, Lei S, et al. Energy and comfort performance of occupant-centric air conditioning strategy in office buildings with personal comfort devices. Building Simulation. 2021; 15(5): 899–911. doi: 10.1007/s12273-021-0852-1

20. Zhou L, Li N, He Y, et al. A field survey on thermal comfort and energy consumption of traditional electric heating devices (Huo Xiang) for residents in regions without central heating systems in China. Energy and Buildings. 2019; 196: 134–144. doi: 10.1016/j.enbuild.2019.05.013

21. Loy NV, Verbeeck G, Knapen E. Passive and active personalized heating systems at a lower indoor ambient temperature. IOP Conference Series: Earth and Environmental Science. 2020; 588(2). doi: 10.1088/1755-1315/588/2/022042

22. Hooshmand SM, Zhang H, Javidanfar H, et al. A review of local radiant heating systems and their effects on thermal comfort and sensation. Energy and Buildings. 2023; 296. doi: 10.1016/j.enbuild.2023.113331

23. WuJ, Liu J, Zhao J, et al. Influencing assessment of different heating modes on thermal comfort in electric vehicle cabin. Energy and Built Environment. 2024; 5(4): 556–567. doi.org/10.1016/j.enbenv.2023.04.005

24. Ali AHH, Morsy MG. Energy efficiency and indoor thermal perception: a comparative study between radiant panel and portable convective heaters. Energy Efficiency. 2010; 3(4): 283–301. doi: 10.1007/s12053-010-9077-3

25. American Society of Heating, Inc. ANSI/ASHRAE Standard 55–2017: Thermal Environmental Conditions for Human Occupancy. ASHRAE Publishing; 2017.

26. Zhang H, Arens E, Zhai Y. A review of the corrective power of personal comfort systems in non-neutral ambient environments. Building and Environment. 2015; 91: 15–41. doi: 10.1016/j.buildenv.2015.03.013

27. He Y, Li N, Zhou L, et al. Thermal comfort and energy consumption in cold environment with retrofitted Huotong (warm-barrel). Building and Environment. 2017; 112: 285–295. doi: 10.1016/j.buildenv.2016.11.044

28. Arens E, Zhang H, Huizenga C. Partial- and whole-body thermal sensation and comfort—Part I: Uniform environmental conditions. Journal of Thermal Biology. 2006; 31(1–2): 53–59. doi: 10.1016/j.jtherbio.2005.11.028

29. Melikov A, Pitchurov G, Naydenov K, et al. Field study on occupant comfort and the office thermal environment in rooms with displacement ventilation. Indoor Air. 2005; 15(3): 205–214. doi: 10.1111/j.1600-0668.2005.00337.x

30. Pasut W, Zhang H, Arens E, et al. Energy-efficient comfort with a heated/cooled chair: Results from human subject tests. Building and Environment. 2015; 84: 10–21. doi: 10.1016/j.buildenv.2014.10.026

31. Deng Q, Wang R, Li Y, et al. Human thermal sensation and comfort in a non-uniform environment with personalized heating. Science of The Total Environment. 2017; 578 :242–248. doi: 10.1016/j.scitotenv.2016.05.172




DOI: https://doi.org/10.24294/tse9922

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