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Characteristics and comfort evaluation of sinusoidal airflows by regulating motor rotating frequency of a floor fan

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Abstract

Increasing air movement by utilizing electric fans is among the common approaches for comfort and energy savings in buildings in summer; however, the use of electric fans is usually the forced constant airflow. This study reformed the one-chip computer program of a floor fan motor and simulated dynamic airflow through controlling the rotating frequency only. The flow field characteristics of constant, oscillated, sinusoidal airflows with periods of 10 s, 30 s, 60 s, 100 s were measured. The comfort performance was evaluated by chamber experiments, with 20 subjects exposed to six airflow patterns under 30 $dgC, 70%RH. The results showed that the simulated sinusoidal airflows had relatively higher turbulence intensity (32%–37%) and β values (> 0.4). While subjects’ thermal sensations were not statistically significant among six airflows, their reported discomfort symptoms during 60 min exposure were reduced under sinusoidal airflows. The calculated convective heat transfer shared similar variations to instantaneous air velocity and skin temperature. A large fluctuation of 10–50 W/m2 and higher total convective heat loss (3000–3500 W/m2) were found for sinusoidal period 30 s. This study develops a new method to simulate varying air velocities through conveniently controlling the fan motor amplitude and frequency, and verifies the comfortable feelings to dynamic sinusoidal airflows. The work benefits to improve the performance of the current electric fans with lower costs and promote the applications of personal ventilation devices in buildings, thus optimizing human thermal comfort, reducing dependences on air conditionings and achieving building energy efficiency.

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References

  • Arens E, Xu T, Miura K, et al. (1998). A study of occupant cooling by personally controlled air movement. Energy and Buildings, 27: 45–59.

    Article  Google Scholar 

  • Arens E, Zhang H (2006). The skin’s role in human thermoregulation and comfort. In: Pan N, Gibson P (eds), Thermal and Moisture Transport in Fibrous Materials. London: Woodhead Publishing.

    Google Scholar 

  • Arens E, Zhang H, Huizenga C (2006). Partial- and whole-body thermal sensation and comfort—Part I: Uniform environmental conditions. Journal of Thermal Biology, 31: 53–59.

    Article  Google Scholar 

  • ASHRAE (2013). ASHRAE Handbook. Fundamentals: Chapter 9 Thermal comfort. Atlanta, GA, USA: American Society of Heating Ventilation and Air Conditioning.

    Google Scholar 

  • ASHRAE (2017). ASHRAE Standard 55. Thermal environmental conditions for human occupancy. Atlanta, GA, USA: American Society of Heating Ventilation and Air Conditioning.

    Google Scholar 

  • Assaad DA, Ghali K, Ghaddar N, et al. (2017). Mixing ventilation coupled with personalized sinusoidal ventilation: Optimal frequency and flow rate for acceptable air quality. Energy and Buildings, 154: 569–580.

    Article  Google Scholar 

  • Benezeth Y, Laurent H, Emile B, et al. (2011). Towards a sensor for detecting human presence and characterizing activity. Energy and Buildings, 43: 305–314.

    Article  Google Scholar 

  • Cabanac M (1971). Physiological role of pleasure. Science, 173: 1103–1107.

    Article  Google Scholar 

  • Chen Y, Raphael B, Sekhar SC (2012). Individual control of a personalized ventilation system integrated with an ambient mixing ventilation system. HVAC & R Research, 18: 1136–1152.

    Google Scholar 

  • Chen W, Liu S, Gao Y, et al. (2018). Experimental and numerical investigations of indoor air movement distribution with an office ceiling fan. Building and Environment, 130: 14–26.

    Article  Google Scholar 

  • de Dear R (2011). Revisiting an old hypothesis of human thermal perception: Alliesthesia. Building Research & Information, 39: 108–117.

    Article  Google Scholar 

  • Du C, Li B, Liu H, et al. (2018). Quantifying the cooling efficiency of air velocity by heat loss from skin surface in warm and hot environments. Building and Environment, 136: 146–155.

    Article  Google Scholar 

  • Du C, Li B, Liu H, et al. (2019). Quantification of personal thermal comfort with localized airflow system based on sensitivity analysis and classification tree model. Energy and Buildings, 194: 1–11.

    Article  Google Scholar 

  • Fallenius BEG, Sattari A, Fransson JHM, et al. (2013). Experimental study on the effect of pulsating inflow to an enclosure for improved mixing. International Journal of Heat and Fluid Flow, 44: 108–119.

    Article  Google Scholar 

  • Fanger PO, Melikov AK, Hanzawa H, et al. (1988). Air turbulence and sensation of draught. Energy and Buildings, 12: 21–39.

    Article  Google Scholar 

  • Filingeri D (2016). Neurophysiology of skin thermal sensation. Comprehensive Physiology, 6(3): 1429–1491.

    Article  Google Scholar 

  • Fountain M, Arens E, de Dear RJ, et al. (1994). Locally controlled air movement preferred in warm isothermal environments. ASHRAE Transactions, 100(2): 937–952.

    Google Scholar 

  • Huang L, Ouyang Q, Zhu Y (2012). Perceptible airflow fluctuation frequency and human thermal response. Building and Environment, 54: 14–19.

    Article  Google Scholar 

  • Huang L, Ouyang Q, Zhu Y, et al. (2013). A study about the demand for air movement in warm environment. Building and Environment, 61: 27–33.

    Article  Google Scholar 

  • Jia L, Radke RJ (2014). Using time-of-flight measurements for privacy-preserving tracking in a smart room. IEEE Transactions on Industrial Informatics, 10: 689–696.

    Article  Google Scholar 

  • Kabanshi A, Wigö H, Ljung R, et al. (2016). Experimental evaluation of an intermittent air supply system—Part 2: Occupant perception of thermal climate. Building and Environment, 108: 99–109.

    Article  Google Scholar 

  • Kang K-N, Song D, Schiavon S (2013). Correlations in thermal comfort and natural wind. Journal of Thermal Biology, 38: 419–426.

    Article  Google Scholar 

  • Kubo H, Isoda N, Enomoto-Koshimizu H (1997). Cooling effects of preferred air velocity in muggy conditions. Building and Environment, 32: 211–218.

    Article  Google Scholar 

  • Kwon M, Remøy H, van den Dobbelsteen A, et al. (2019). Personal control and environmental user satisfaction in office buildings: Results of case studies in the Netherlands. Building and Environment, 149: 428–435.

    Article  Google Scholar 

  • Lampret Z, Krese G, Butala V, et al. (2018). Impact of airflow temperature fluctuations on the perception of draught. Energy and Buildings, 179: 112–120.

    Article  Google Scholar 

  • Lipczynska A, Schiavon S, Graham LT (2018). Thermal comfort and self-reported productivity in an office with ceiling fans in the tropics. Building and Environment, 135: 202–212.

    Article  Google Scholar 

  • Liu W, Lian Z, Deng Q, et al. (2011). Evaluation of calculation methods of mean skin temperature for use in thermal comfort study. Building and Environment, 46: 478–488.

    Article  Google Scholar 

  • Liu S, Yin L, Ho WK, et al. (2017). A tracking cooling fan using geofence and camera-based indoor localization. Building and Environment, 114: 36–44.

    Article  Google Scholar 

  • Liu S, Lipczynska A, Schiavon S, et al. (2018). Detailed experimental investigation of air speed field induced by ceiling fans. Building and Environment, 142: 342–360.

    Article  Google Scholar 

  • Mayer E (1987). Physical causes for draft: Some new findings. ASHRAE Transactions, 93(1): 540–548.

    Google Scholar 

  • Melikov AK, Cermak R, Majer M (2002). Personalized ventilation: evaluation of different air terminal devices. Energy and Buildings, 34: 829–836.

    Article  Google Scholar 

  • Melikov AK, Krejciríková B, Kaczmarczyk J, et al. (2013a). Human response to local convective and radiant cooling in a warm environment. HVAC&R Research, 19: 1023–1032.

    Article  Google Scholar 

  • Melikov AK, Skwarczynski MA, Kaczmarczyk J, et al. (2013b). Use of personalized ventilation for improving health, comfort, and performance at high room temperature and humidity. Indoor Air, 23: 250–263.

    Article  Google Scholar 

  • Present E, Raftery P, Brager G, et al. (2019). Ceiling fans in commercial buildings: In situ airspeeds & practitioner experience. Building and Environment, 147: 241–257.

    Article  Google Scholar 

  • Rawal R, Schweiker M, Kazanci OB, et al. (2020). Personal comfort systems: A review on comfort, energy, and economics. Energy and Buildings, 214: 109858.

    Article  Google Scholar 

  • Sandberg M, Elvsén PA (2004). Rapid time varying ventilation flow rates as a mean of increasing the ventilation efficiency. In: Proceedings of the 9th International Conference on Air Distribution in Rooms, Coimbra, Portugal.

  • Schiavon S, Yang B, Donner Y, et al. (2017). Thermal comfort, perceived air quality, and cognitive performance when personally controlled air movement is used by tropically acclimatized persons. Indoor Air, 27: 690–702.

    Article  Google Scholar 

  • Sekhar SC, Gong N, Tham KW, et al. (2005). Findings of personalized ventilation studies in a hot and humid climate. HVAC&R Research, 11: 603–620.

    Article  Google Scholar 

  • Shahzad S, Calautit JK, Calautit K, et al. (2018). Advanced personal comfort system (APCS) for the workplace: A review and case study. Energy and Buildings, 173: 689–709.

    Article  Google Scholar 

  • Shimazaki Y, Yoshida A, Yamamoto T (2015). Thermal responses and perceptions under distinct ambient temperature and wind conditions. Journal of Thermal Biology, 49–50: 1–8.

    Article  Google Scholar 

  • Tanabe SI, Kimura KI (1994). Effects of air temperature, humidity, and air movement on thermal comfort under hot and humid conditions. ASHRAE Transactions, 100(2): 953–969.

    Google Scholar 

  • Toftum J, Langkilde G, Fanger PO (2004). New indoor environment chambers and field experiment offices for research on human comfort, health and productivity at moderate energy expenditure. Energy and Buildings, 36: 899–903.

    Article  Google Scholar 

  • Vesely M, Zeiler W (2014). Personalized conditioning and its impact on thermal comfort and energy performance—A review. Renewable and Sustainable Energy Reviews, 34: 401–408.

    Article  Google Scholar 

  • Wang H, Huang C, Liu Z, et al. (2006). Dynamic evaluation of thermal comfort environment of air-conditioned buildings. Building and Environment, 41: 1522–1529.

    Article  Google Scholar 

  • Wang Y, Ma Z, Zhou Y, et al. (2016). Experimental investigation on the airflow characteristics of an attachment-based personalized ventilation method. Building Services Engineering Research and Technology, 37: 710–729.

    Article  Google Scholar 

  • Wang Z, Warren K, Luo M, et al. (2020). Evaluating the comfort of thermally dynamic wearable devices. Building and Environment, 167: 106443.

    Article  Google Scholar 

  • Warthmann A, Wölki D, Metzmacher H, et al. (2018). Personal climatization systems—A review on existing and upcoming concepts. Applied Sciences, 9: 35.

    Article  Google Scholar 

  • Watanabe S, Melikov AK, Knudsen GL (2010). Design of an individually controlled system for an optimal thermal microenvironment. Building and Environment, 45: 549–558.

    Article  Google Scholar 

  • World Medical Association (2013). WMA Declaration of Helsinki—Ethical Principles for Medical Research Involving Human Subjects. In: the 64th WMA General Assembly, Fortaleza, Brazil.

  • Wolkoff P, Nøjgaard JK, Troiano P, et al. (2005). Eye complaints in the office environment: Precorneal tear film integrity influenced by eye blinking efficiency. Occupational and Environmental Medicine, 62: 4–12.

    Article  Google Scholar 

  • Wolkoff P (2010). Ocular discomfort by environmental and personal risk factors altering the precorneal tear film. Toxicology Letters, 199: 203–212.

    Article  Google Scholar 

  • Xia J, Yang K, Zheng S, et al. (2010). Intelligent vertical oscillating fan with automatic tracking capability. China Patent CN101696697.

  • Yang B, Schiavon S, Sekhar C, et al. (2015). Cooling efficiency of a brushless direct current stand fan. Building and Environment, 85: 196–204.

    Article  Google Scholar 

  • Yang B, Melikov AK, Kabanshi A, et al. (2019). A review of advanced air distribution methods-theory, practice, limitations and solutions. Energy and Buildings, 202: 109359.

    Article  Google Scholar 

  • Yu Y, Liu J, Chauhan K, et al. (2020). Experimental study on convective heat transfer coefficients for the human body exposed to turbulent wind conditions. Building and Environment, 169: 106533.

    Article  Google Scholar 

  • Zhai Y, Zhang H, Zhang Y, et al. (2013). Comfort under personally controlled air movement in warm and humid environments. Building and Environment, 65: 109–117.

    Article  Google Scholar 

  • Zhang H, Arens E, Zhai Y (2015). A review of the corrective power of personal comfort systems in non-neutral ambient environments. Building and Environment, 91: 15–41.

    Article  Google Scholar 

  • Zhou G, Melikov AK (2002). Equivalent frequency—A new parameter for description of frequency characteristics of airflow fluctuations. In: Proceedings of the 8th International Conference on Air Distribution in Rooms (Roomvent), Copenhagen, Denmark.

  • Zhou G, Melikov AK, Fanger PO (2002). Impact of equivalent frequency on the sensation of draught. In: Proceedings of the 8th International Conference on Air Distribution in Rooms (Roomvent), Copenhagen, Denmark.

  • Zhou X, Ouyang Q, Lin G, et al. (2006). Impact of dynamic airflow on human thermal response. Indoor Air, 16: 348–355.

    Article  Google Scholar 

  • Zhou X, Linghu J, Xu J, et al. (2014). Control method and device allowing electric fan to track human bodies. China Patent CN103925225.

  • Zhu Y, Luo M, Ouyang Q, et al. (2015). Dynamic characteristics and comfort assessment of airflows in indoor environments: A review. Building and Environment, 91: 5–14.

    Article  Google Scholar 

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51908079), associated with the projects supported by the Fundamental Research Funds for the Central Universities (No. 2021CDJCGJ015). The authors would also thank for the subjects for their participation.

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Authors and Affiliations

  1. Joint International Research Laboratory of Green Buildings and Built Environments (Ministry of Education), Chongqing University, Chongqing, 400045, China

    Chenqiu Du, Hong Liu, Wei Yu, Yu Ji, Ke Yan & Liyang Ruan

  2. National Centre for International Research of Low-carbon and Green Buildings (Ministry of Science and Technology), Chongqing University, Chongqing, 400045, China

    Chenqiu Du, Hong Liu, Wei Yu, Yu Ji, Ke Yan & Liyang Ruan

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  1. Chenqiu Du
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  2. Hong Liu
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  3. Wei Yu
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  4. Yu Ji
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  6. Liyang Ruan
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Correspondence to Chenqiu Du.

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Du, C., Liu, H., Yu, W. et al. Characteristics and comfort evaluation of sinusoidal airflows by regulating motor rotating frequency of a floor fan. Build. Simul. 15, 1035–1049 (2022). https://doi.org/10.1007/s12273-021-0843-2

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  • DOI: https://doi.org/10.1007/s12273-021-0843-2

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