Energy and human's ability to transform energy into useful work has been the cornerstone of the development of civilizations. Throughout the majority of human existence, we relied solely on metabolic energy derived from plants and animals. In only a few centuries, society has almost completely transformed, from relying on somatic energy to become almost entirely dependent on fossil fuels. The combustion of hydrocarbon energy resources has had detrimental impacts on our environment, which has initiated a push for clean energy. This research study explores the metabolic energy output of humans, specifically within an exercise facility, to evaluate the feasibility of electrical power to be sustained from human-powered energy. Two rowing workouts were evaluated and then compared to solar photovoltaic as an alternative renewable energy. The result of the study demonstrates that 40 members of various physical abilities can collaboratively provide 3–5% of the gym’s average daily electricity demand if converted at an efficiency of 64%. The cost of converting the rowing machines resulted in a 33-year payback period.
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Endosomatic : within or part of the biological body. Endosomatic energy is the metabolic transformation of food energy into muscle energy occurring within the human body (Sterrer 1993).
Exosomatic: external to the human body. Exosomatic energy is generated outside of the human body, such as burning coal (Sterrer 1993).
BMI is a person’s mass in kilograms (kg) divided by the square of their height (m2). Obesity is a BMI of 30 or above for either sex (Flegal et al. 2012).
Minor appliances include computer, television, cable box, clock, microwave, cell phone charger, stereo, speakers, and coffee maker.
Bardi U (2016) What future for the anthropocene? A biophysical interpretation. Biophys Econ Resour Qual 1:2. https://doi.org/10.1007/s41247-016-0002-z
Bartlett C (2014) The design of the Great Pyramid of Khufu. Nexus Netw J 16(2):299–311. https://doi.org/10.1007/s00004-014-0193-9
CA Energy Office (2016) Renewables portfolio standard (RPS) regulations for POUs. 2016. http://www.energy.ca.gov/portfolio/
Census (2015) U.S. Census Quick Facts, United States Census Bureau. http://www.census.gov/quickfacts/table/PST045215/45
Concept2 (2016) Training Muscles Used, Concept2 Rowing Machines. http://www.concept2.com/indoor-rowers/training/muscles-used
Customer Generation and Solar Energy FAQ (2015) [Commercial]. https://www.duke-energy.com/our-company/environment/renewable-energy/solar-energy/sc-solar-energy-programs/solar-rebates
Davis SC, Williams SE, Boundy RG (2016) Transportation energy data book: Edition 35 (No. ORNL/TM-2016/470). Oak Ridge National Laboratory (ORNL), Oak Ridge
de Almeida A, Fonseca P, Schlomann B, Feilberg N (2011) Characterization of the household electricity consumption in the EU, potential energy savings and specific policy recommendations. Energy Build 43(8):1884–1894. https://doi.org/10.1016/j.enbuild.2011.03.027
Donelan AJM et al (2015) Biomechanical energy harvesting: electricity generating during walking with minimal user effort. Science 319(5864):807–810
EIA (2013) International energy statistics: total primary energy consumption, U.S. Energy Information Agency, Washington, DC
EIA (2016) South Carolina state energy profile industrial, U.S. Energy Information Administration, Washington, DC
Flegal KM, Carroll MD, Kit BK, Ogden CL (2012) Prevalence of obesity and trends in the distribution of body mass index among US adults, 1999–2010. JAMA 307(5):491–497
Fonte GCA (2007) Building the great pyramid in a year: an engineer’s report. Algora Publishing, New York (ProQuest ebrary. Web. 12 June 2015)
Gifford R, Millington R (1975) Energetics of food production with special emphasis on the Australian situation. CSIRO Bull 288:1–29
Granstrom J, Feenstra J, Sodano H, Farinholt K (2007) Energy harvesting from a backpack instrumented with piezoelectric shoulder straps. Smart Mater Struct 16(5):1810–1820
Gustavsson J, Cederberg C, Sonesson U, Van Otterdijk R, Meybeck A (2011) Global food losses and food waste. FAO, Rome, pp 1–38
Haji MN, Lau K, Agogino AM (2010) Harnessing human power for alternative energy in fitness facilities: a case study. Annual Conference of the Association for Energy Sustainability, Philadelphia
Kuang SY et al (2015) Two-dimensional rotary triboelectric nanogenerator as a portable and wearable power source for electronics. IEEE Pervasive Comput 13:10–16
MacKay D (2008) Sustainable energy-without the hot air. UIT, Cambridge
Mattick CS, Williams E, Allenby BR (2009) Energy and civilization: a history of energy production and consumption in a global cultural, technological and economic context. In 2009 IEEE international symposium on sustainable systems and technology, Phoenix, pp. 1–6. https://doi.org/10.1109/ISSST.2009.5156766
McArdle WD (1986) Exercise physiology, 2nd edn. Lea & Febigier, Philadelphia
Nersesian RL (2010) Energy for the 21st century: a comprehensive guide to conventional and alternative sources. M.E. Sharpe, Armonk
NREL (2016) System Advisor Model Version 2016.3.14, National Renewable Energy Laboratory, Golden. Accessed 31 Oct 2016. https://sam.nrel.gov/content/downloads
Sanjay SD (2014) Harvesting electrical energy from a stationary bike: an experimental approach, Thesis: Massey University
S.C. Code Ann. § 58-39-110 et seq. (2013–2014) Bill 1189 Text of Previous Version. South Carolina Legislature Online. http://www.scstatehouse.gov/sess120_2013-2014/prever/1189_20140521.htm. Accessed 17 Aug 2015
Shephard RJ (2010) Science and medicine of rowing: a review science and medicine of rowing : a review. Sports Sci https://doi.org/10.1080/026404198366416
Smil V (2004) World history and energy. Encycl Energy 6:549–561
Starner T (1996) Human-powered wearable computing. IBM Syst J 35(3.4):618–629
State of Obesity (2016) The State of Obesity in South Carolina, State of Obesity, Trust for America’s Health, Robert Wood Johnson Foundation. http://stateofobesity.org/states/sc/
Statista (2014) Facts on health and fitness clubs, statista: the statistics portal. https://www.statista.com/topics/1141/health-and-fitness-clubs/
Sterrer W (1993) Human economics: a non-human perspective. Ecol Econ 7(3):183–202
Tackett N (2008) The great wall and conceptualizations of the border under the Northern Song. J Song-Yuan Stud 38:99–138. https://doi.org/10.1353/sys.0.0032
Toma Č, Kamnik R (2011) The measurement setup for real-time biomechanical analysis of rowing on an ergometer. Measurement 44:1819–1827
This research was supported by the Department of Environmental Engineering and Earth Sciences (EEES) at Clemson University. We would also like to thank Andrew and Krissy Simmons for their cooperation and for allowing me to analyze their facility, Green City Crossfit. The utility data that they provided were a vital element of this research and is greatly appreciated.
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Energy is the product of the appliance power and the estimated usage time. Energy value is needed to be calculated for every month since the usage time varied (Table 4).
A stationary rower differs from the exercise machines used in previous studies by requiring an individual to engage multiple muscle groups. Figure 5 shows the rowing stroke consisting of four distinct yet interrelated movement phases; the catch, drive, finish, and recovery. The majority of the energy is exerted during the drive phase, where the rower applies force to the sprocket on the shaft of the flywheel by engaging muscles from the legs, then hips and back, ending with the arms at the finish stage. Rowers work in a transitional system, where power is produced from the force pulling the handle attached to a chain at a linear velocity. During the power stroke the rower’s exerted effort drives a flywheel via a ratchet, and the cable recoils under tension from a bungee cord during the recovery.
The rower’s average results for pull length [m], drive phase duration [s], and max force [N] for 20 SPM, 26 SPM, and 34 SPM from Toma and Kamnik (2011) were used to calculate the maximum power potential. Pull length is the difference between the maximum and the minimum distance of the handle pulled. Drive phase duration is the time required to achieve the pull length. Max force is the peak pull force on the handle and occurs midpoint of the drive phase duration.
The instantaneous maximum potential power (MPP) that a rower can generate is expressed (Eq. 2) with respect to the torque (τ) that the rower applies to the sprocket of the shaft and the angular velocity (ω) of the flywheel.
Torque is applied to the sprocket from the chain, which is connected to the handle that the rower exerts a pull force (F). Since the force is being applied perpendicular to the sprocket (\(\sin \theta =1\)), Eq. 3 can be simplified to the torque equaling the product of the force and the sprocket’s radius.
The flywheel angular velocity can be related to the handle linear velocity (V) by the radius (r) of the sprocket (14.3 mm).
Table 5 displays the instantaneous MPP generated per row stroke using Eqs. 2–4. An individual's electrical power output, at a 64% conversion efficiency, could power small appliances such as a clock, cell phone charger, vacuum cleaner, or a television, but not for sustained periods. A subject rowing at 34 SPM can produce an MPP of 1520 watts, which is enough to operate a microwave, but falls short of meeting the necessary power of an industrial fan of 1800 watts (Table 6).
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Carbajales-Dale, M., Douglass, B. Human-Powered Electricity Generation as a Renewable Resource. Biophys Econ Resour Qual 3, 3 (2018). https://doi.org/10.1007/s41247-018-0036-5