{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T07:23:26Z","timestamp":1768807406438,"version":"3.49.0"},"reference-count":54,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2019,9,5]],"date-time":"2019-09-05T00:00:00Z","timestamp":1567641600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Applied Sciences"],"abstract":"<jats:p>The main objective of the study was to investigate the thermal performance of five (open and closed) bicycle helmets for convective and evaporative heat transfer using a nine-zone thermal manikin. The shape of the thermal manikin was obtained by averaging the 3D-point coordinates of the head over a sample of 85 head scans of human subjects, obtained through magnetic resonance imaging (MRI) and 3D-printed. Experiments were carried out in two stages, (i) a convective test and (ii) an evaporative test, with ambient temperature maintained at 20.5 \u00b1 0.5 \u00b0C and manikin skin temperature at 30.5 \u00b1 0.5 \u00b0C for both the tests. Results showed that the evaporative heat transfer contributed up to 51%\u201353% of the total heat loss from the nude head. For the convective tests, the open helmet A1 having the highest number of vents among tested helmets showed the highest cooling efficiency at 3 m\/s (100.9%) and at 6 m\/s (101.6%) and the closed helmet (A2) with fewer inlets and outlets and limited internal channels showed the lowest cooling efficiency at 3 m\/s (75.6%) and at 6 m\/s (84.4%). For the evaporative tests, the open helmet A1 showed the highest cooling efficiency at 3 m\/s (97.8%), the open helmet A4 showed the highest cooling efficiency at 6 m\/s (96.7%) and the closed helmet A2 showed the lowest cooling efficiency at 3 m\/s (79.8%) and at 6 m\/s (89.9%). Two-way analysis of variance (ANOVA) showed that the zonal heat-flux values for the two tested velocities were significantly different (p &lt; 0.05) for both the modes of heat transfer. For the convective tests, at 3 m\/s, the frontal zone (256\u2013283 W\/m2) recorded the highest heat flux for open helmets, the facial zone (210\u2013212 W\/m2) recorded the highest heat flux for closed helmets and the parietal zone (54\u2013123 W\/m2) recorded the lowest heat flux values for all helmets. At 6 m\/s, the frontal zone (233\u2013310 W\/m2) recorded the highest heat flux for open helmets and the closed helmet H1, the facial zone (266 W\/m2) recorded the highest heat flux for the closed helmet A2 and the parietal zone (65\u2013123 W\/m2) recorded the lowest heat flux for all the helmets. For evaporative tests, at 3 m\/s, the frontal zone (547\u2013615 W\/m2) recorded the highest heat flux for all open helmets and the closed helmet H1, the facial zone (469 W\/m2) recorded the highest heat flux for the closed helmet A2 and the parietal zone (61\u2013204 W\/m2) recorded the lowest heat flux for all helmets. At 6 m\/s, the frontal zone (564\u2013621 W\/m2) recorded highest heat flux for all the helmets and the parietal zone (97\u2013260 W\/m2) recorded the lowest heat flux for all helmets.<\/jats:p>","DOI":"10.3390\/app9183672","type":"journal-article","created":{"date-parts":[[2019,9,5]],"date-time":"2019-09-05T03:22:36Z","timestamp":1567653756000},"page":"3672","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Thermal-Performance Evaluation of Bicycle Helmets for Convective and Evaporative Heat Loss at Low and Moderate Cycling Speeds"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1247-2438","authenticated-orcid":false,"given":"Shriram","family":"Mukunthan","sequence":"first","affiliation":[{"name":"Product Development, Faculty of Design Sciences, University of Antwerp, Ambtmanstraat, 2000 Antwerp 1, Belgium"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9577-1507","authenticated-orcid":false,"given":"Jochen","family":"Vleugels","sequence":"additional","affiliation":[{"name":"Product Development, Faculty of Design Sciences, University of Antwerp, Ambtmanstraat, 2000 Antwerp 1, Belgium"}]},{"given":"Toon","family":"Huysmans","sequence":"additional","affiliation":[{"name":"Applied Ergonomics and Design, Department of Industrial Design, Delft University of Technology, Landbergstraat 15, 2628 CE Delft, The Netherlands"},{"name":"Vision Lab, Department of Physics, University of Antwerp (CDE), Universiteitsplein, 2610 Antwerp 1, Belgium"}]},{"given":"Kalev","family":"Kuklane","sequence":"additional","affiliation":[{"name":"Division of Ergonomics and Aerosol Technology, Department of Design Sciences, Lund University, 221 00 Lund, Sweden"}]},{"given":"Tiago Sotto","family":"Mayor","sequence":"additional","affiliation":[{"name":"SIMTECH Laboratory, Transport Phenomena Research Centre, Engineering Faculty of Porto University, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"given":"Guido","family":"De Bruyne","sequence":"additional","affiliation":[{"name":"Product Development, Faculty of Design Sciences, University of Antwerp, Ambtmanstraat, 2000 Antwerp 1, Belgium"},{"name":"Lazer Sport NV, Lamorinierestraat 33-37 bus D, 2018 Antwerp, Belgium"}]}],"member":"1968","published-online":{"date-parts":[[2019,9,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1016\/0001-4575(88)90002-4","article-title":"Head-injuries to pedal cyclists and the promotion of helmet use in Victoria, Australia","volume":"20","author":"Wood","year":"1988","journal-title":"Accid. Anal. Prev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.aap.2018.03.026","article-title":"Bicycle helmets\u2014To wear or not to wear? A meta-analysis of the effects of bicycle helmets on injuries","volume":"117","author":"Hoye","year":"2018","journal-title":"Accid. Anal. Prev."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"413","DOI":"10.1016\/j.amjsurg.2016.05.021","article-title":"Bicycle helmets work when it matters the most","volume":"213","author":"Joseph","year":"2017","journal-title":"Am. J. Surg."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"148","DOI":"10.1080\/00913847.1988.11709413","article-title":"Safety standards for bicycle helmets","volume":"16","author":"Burke","year":"1988","journal-title":"Physician Sportsmed."},{"key":"ref_5","first-page":"372","article-title":"Bicycle injuries and helmet use: A systematic review and meta-analysis","volume":"46","author":"Olivier","year":"2017","journal-title":"Int. J. Epidemiol."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.aap.2014.02.016","article-title":"Bicycle helmets are highly effective at preventing head injury during head impact: Head-form accelerations and injury criteria for helmeted and unhelmeted impacts","volume":"70","author":"Cripton","year":"2014","journal-title":"Accid. Anal. Prev."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1075","DOI":"10.1016\/j.ijimpeng.2007.05.005","article-title":"Oblique impact testing of bicycle helmets","volume":"35","author":"Mills","year":"2008","journal-title":"Int. J. Impact Eng."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1016\/j.aap.2018.12.017","article-title":"Evaluation of a novel bicycle helmet concept in oblique impact testing","volume":"124","author":"Bliven","year":"2019","journal-title":"Accid. Anal. Prev."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1016\/j.aap.2013.05.019","article-title":"Angular Impact Mitigation system for bicycle helmets to reduce head acceleration and risk of traumatic brain injury","volume":"59","author":"Hansen","year":"2013","journal-title":"Accid. Anal. Prev."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1016\/0003-6870(93)90175-9","article-title":"An improved motorcycle helmet design for tropical climates","volume":"24","author":"Patel","year":"1993","journal-title":"Appl. Ergon."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1080\/15389580801895152","article-title":"Motorcycle helmet use in southern china: An observational study","volume":"9","author":"Li","year":"2008","journal-title":"Traffic Inj. Prev."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"264","DOI":"10.1136\/ip.5.4.264","article-title":"Factors affecting motorcycle helmet use in the population of Greater Athens, Greece","volume":"5","author":"Skalkidou","year":"1999","journal-title":"Inj. Prev."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1136\/ip.9.3.257","article-title":"Effect of Italy\u2019s motorcycle helmet law on traumatic brain injuries","volume":"9","author":"Servadei","year":"2003","journal-title":"Inj. Prev."},{"key":"ref_14","unstructured":"ASHRAE (2010). ANSI\/ASHRAE Standard 55 2010\u2014Thermal Environmental Conditions for Human Occupancy, ASHRAE."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"721","DOI":"10.1007\/s11517-006-0086-5","article-title":"The Snellen human calorimeter revisited, re-engineered and upgraded: Design and performance characteristics","volume":"44","author":"Reardon","year":"2006","journal-title":"Med. Biol. Eng. Comput."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"68","DOI":"10.1007\/BF00599244","article-title":"A suit calorimeter for energy-balance studies on humans during heavy exercise","volume":"68","author":"Hambraeus","year":"1994","journal-title":"Eur. J. Appl. Physiol. Occup. Physiol."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"1194","DOI":"10.1016\/j.physbeh.2011.12.017","article-title":"The effect of a covert manipulation of ambient temperature on heat storage and voluntary exercise intensity","volume":"105","author":"Hartley","year":"2012","journal-title":"Physiol. Behav."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"719","DOI":"10.1007\/s00421-008-0828-1","article-title":"Spatial differences in sensible and latent heat losses under a bicycle helmet","volume":"104","author":"Aerts","year":"2008","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"217","DOI":"10.1088\/0957-0233\/14\/2\/309","article-title":"Heated, perspiring manikin headform for the measurement of headgear ventilation characteristics","volume":"14","author":"Bruhwiler","year":"2003","journal-title":"Meas. Sci. Technol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1016\/S0169-8141(99)00058-X","article-title":"Improving thermal properties of industrial safety helmets","volume":"26","author":"Hsu","year":"2000","journal-title":"Int. J. Ind. Ergon."},{"key":"ref_21","unstructured":"Abeysekera, J.D.A., Holmer, I., and Dupuis, C. (1991). Heat-transfer characteristics of industrial safety helmets. Towards Human Work. Solutions to Problems in Occupational Health and Safety, Taylor and Francis Group."},{"key":"ref_22","unstructured":"Osczevski, R.J. (1996). Design and Evaluation of a Three-Zone Thermal Manikin Head, Defense and Civil Institute of Environmental Medicine."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1016\/0003-6870(95)00010-A","article-title":"Evaporative heat-transfer characteristics of industrial safety helmets","volume":"26","author":"Liu","year":"1995","journal-title":"Appl. Ergon."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"457","DOI":"10.1115\/1.1287163","article-title":"A system for quantifying the cooling effectiveness of bicycle helmets","volume":"122","author":"Reid","year":"2000","journal-title":"J. Biomech. Eng.-Trans. Asme"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"624","DOI":"10.1016\/j.applthermaleng.2016.09.142","article-title":"The effect of forced convection and PCM on helmets\u2019 thermal performance in hot and arid environments","volume":"111","author":"Ghani","year":"2017","journal-title":"Appl. Therm. Eng."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1007\/s00484-016-1209-9","article-title":"Multi-sector thermo-physiological head simulator for headgear research","volume":"61","author":"Martinez","year":"2017","journal-title":"Int. J. Biometeorol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1002\/1348-9585.12024","article-title":"Effects of ventilation openings in industrial safety helmets on evaporative heat dissipation","volume":"61","author":"Ueno","year":"2019","journal-title":"J. Occup. Health"},{"key":"ref_28","first-page":"15","article-title":"Thermal comfort and drag of a streamlined cycling helmet as a function of ventilation hole placement","volume":"232","author":"Underwood","year":"2018","journal-title":"Proc. Inst. Mech. Eng. Part P-J. Sports Eng. Technol."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.ergon.2014.10.004","article-title":"A review on ergonomics of headgear: Thermal effects","volume":"45","author":"Bogerd","year":"2015","journal-title":"Int. J. Ind. Ergon."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"698","DOI":"10.1007\/s00421-004-1114-5","article-title":"Bicycle helmet ventilation and comfort angle dependence","volume":"92","author":"Bruhwiler","year":"2004","journal-title":"Eur. J. Appl. Physiol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/j.ergon.2015.11.012","article-title":"Global and local heat transfer analysis for bicycle helmets using thermal head manikins","volume":"53","author":"Martinez","year":"2016","journal-title":"Int. J. Ind. Ergon."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1016\/j.ergon.2008.08.001","article-title":"Role of the visor in forced convective heat loss with bicycle helmets","volume":"39","author":"Bruhwiler","year":"2009","journal-title":"Int. J. Ind. Ergon."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"733","DOI":"10.1080\/02640410701787783","article-title":"The effect of rowing headgear on forced convective heat loss and radiant heat gain on a thermal manikin headform","volume":"26","author":"Bogerd","year":"2008","journal-title":"J. Sport Sci."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"278","DOI":"10.1016\/j.ergon.2012.02.003","article-title":"Quantification of local ventilation efficiency under bicycle helmets","volume":"42","author":"Aerts","year":"2012","journal-title":"Int. J. Ind. Ergon."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"999","DOI":"10.1080\/02640410500457877","article-title":"Heat transfer variations of bicycle helmets","volume":"24","author":"Bruhwiler","year":"2006","journal-title":"J. Sport Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"300","DOI":"10.1016\/j.apergo.2013.04.011","article-title":"Evaluation of thermal and evaporative resistances in cricket helmets using a sweating manikin","volume":"45","author":"Pang","year":"2014","journal-title":"Appl. Ergon."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1016\/j.apergo.2008.03.001","article-title":"Heat loss variations of full-face motorcycle helmets","volume":"40","author":"Bogerd","year":"2009","journal-title":"Appl. Ergon."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1025","DOI":"10.1080\/02640410801930143","article-title":"Radiant heat transfer of bicycle helmets and visors","volume":"26","author":"Bruhwiler","year":"2008","journal-title":"J. Sport Sci."},{"key":"ref_39","unstructured":"Aljaste, H., Kuklane, K., and Heidmets, S. (2014, January 18\u201319). Better bicycle helmets for commuters\u2014Evaluation of ventilation. Proceedings of the International Cycling Safety Conference 2014, Gothenburg, Sweden."},{"key":"ref_40","first-page":"538","article-title":"A combined statistical shape model of the scalp and skull of the human head","volume":"591","author":"Danckaers","year":"2018","journal-title":"Adv. Intell. Syst."},{"key":"ref_41","unstructured":"ASTM (2016). ASTM F1291-16. Standard Test Method for Measuring the Thermal Insulation of Clothing Using a Heated Manikin, ASTM."},{"key":"ref_42","unstructured":"ASTM (2016). ASTM F2370-16. Standard Test Method for Measuring the Evaporative Resistance of Clothing Using a Sweating Manikin, ASTM."},{"key":"ref_43","first-page":"517","article-title":"A comparison between physical and virtual experiments of convective heat transfer between head and bicycle helmet","volume":"591","author":"Mukunthan","year":"2018","journal-title":"Adv. Intell. Syst."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1113\/jphysiol.1945.sp004103","article-title":"The regional distribution of sweating","volume":"104","author":"Weiner","year":"1945","journal-title":"J. Physiol."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"201","DOI":"10.1007\/BF01803898","article-title":"Control of local and total sweating during exercise transients","volume":"15","author":"Nadel","year":"1971","journal-title":"Int. J. Biometeorol."},{"key":"ref_46","unstructured":"IUPS (2001). Glossary of terms for thermal physiology. Jpn. J. Physiol., 51, 245\u2013280."},{"key":"ref_47","unstructured":"Fanger, P.O. (1972). Thermal Comfort: Analysis and Applications in Environmental Engineering, McGraw-Hill Book Co."},{"key":"ref_48","first-page":"331","article-title":"Man and his thermal environment","volume":"70","author":"Clark","year":"1958","journal-title":"J. Am. Soc. Nav. Eng."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"311","DOI":"10.1177\/0040517510380108","article-title":"Thermal protective performance of protective clothing used for low radiant heat protection","volume":"81","author":"Song","year":"2011","journal-title":"Text. Res. J."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1016\/0306-4565(93)90066-3","article-title":"Factors Affecting the resistance to heat-transfer provided by clothing","volume":"18","author":"Mccullough","year":"1993","journal-title":"J. Therm. Biol."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"581","DOI":"10.1016\/S0378-7788(02)00008-7","article-title":"Personal factors in thermal comfort assessment: Clothing properties and metabolic heat production","volume":"34","author":"Havenith","year":"2002","journal-title":"Energy Build."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"685","DOI":"10.1016\/j.apergo.2006.01.002","article-title":"Interactions of the surface heat and moisture transfer from the human body under varying climatic conditions and walking speeds","volume":"37","author":"Qian","year":"2006","journal-title":"Appl. Ergon."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"313","DOI":"10.14430\/arctic1262","article-title":"The Basis of Wind Chill","volume":"48","author":"Osczevski","year":"1995","journal-title":"Arctic"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1016\/j.ergon.2018.07.009","article-title":"Computational and subjective assessment of ventilated helmet with venturi effect and backvent","volume":"68","author":"Shishodia","year":"2018","journal-title":"Int. J. Ind. Ergon."}],"container-title":["Applied Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2076-3417\/9\/18\/3672\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T13:16:52Z","timestamp":1760188612000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2076-3417\/9\/18\/3672"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,9,5]]},"references-count":54,"journal-issue":{"issue":"18","published-online":{"date-parts":[[2019,9]]}},"alternative-id":["app9183672"],"URL":"https:\/\/doi.org\/10.3390\/app9183672","relation":{},"ISSN":["2076-3417"],"issn-type":[{"value":"2076-3417","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,9,5]]}}}