{"id":59,"date":"2009-04-01T00:06:49","date_gmt":"2009-04-01T07:06:49","guid":{"rendered":"http:\/\/oregonstate.edu\/sustainability\/blog\/?p=59"},"modified":"2009-04-01T00:06:49","modified_gmt":"2009-04-01T07:06:49","slug":"update-on-osus-human-power-installation","status":"publish","type":"post","link":"https:\/\/blogs.oregonstate.edu\/ecologue\/2009\/04\/01\/update-on-osus-human-power-installation\/","title":{"rendered":"Update on OSU human power installation"},"content":{"rendered":"

With apologies for the gap between blog entries, I thought it might be time to write a little (or a lot) more about the installation of “human power” harvesting at our Dixon Recreation Center<\/a>.<\/p>\n

The press coverage OSU received as a result of this innovative installation exceeded even my expectations, and responses have been overwhelmingly positive.\u00a0 Many have called or written me for more information and details about the vendor, the equipment and how it’s all working out.\u00a0 I have not had time to respond individually to each inquiry, so my hope is that this longer response might serve to answer all the common – and some of the uncommon – questions.\u00a0 Also, please post questions to this blog rather than emailing me and I will respond here; I’ve received many similar questions, so it would be great to share the responses with everyone.<\/p>\n

The basics.<\/strong> The system is comprised of just a few key components: 22 elliptical exercise machines, 2 inverters, AC and DC wiring, and a display computer. The ReRev<\/a> technology is in the inverters, which act much like solar inverters in that they take DC power generated by the elliptical machines and convert it to AC power that is fed back onto the utility grid. This building, like most, consumes far more electricity even “idling” than these 22 units will ever produce, so all the power generated is consumed on site in that facility.\u00a0 We do have expansion capability, however, of up to 40 machines with the existing inverters, and we wired to add at least one more inverter eventually.<\/p>\n

Each elliptical machine can generate up to 400 watts with a beefy user at a full sprint.\u00a0 Even the best athletes couldn’t maintain that output for long.\u00a0 Most users operate the machines at lower-than-we-expected resistance levels, which is contributing to a bit less output than we expected (more details on this below).<\/p>\n

Getting it done.<\/strong> Installation went very smoothly thanks to our great Rec Sports staff and their contracted electricians Cherry City Electric, the vendor ReRev and Pacific Power<\/a>, the local electrical provider.\u00a0 Pacific Power was great in working with this clearly out of the box request.\u00a0 The actual install only took a few days, with some tidying up over a few more days.<\/p>\n

Part of the beauty of this system is the simplicity.\u00a0 Because the elliptical machines come from the factory with DC generation capacity (that’s what provides the programmable, variable resistance for your workout) no modifications to the exercise equipment were necessary.\u00a0 In the factory setup, DC current that provides resistance is burned off – literally – in small ceramic heaters inside each machine.\u00a0 Not so wise to create heat in exercise facilities that need a lot of annual cooling, eh?\u00a0 Rather than running heat-making resisters, DC wiring is run from the ellipticals to ReRev’s special inverters, and AC wiring connects the inverters to a building electrical panel.\u00a0 We ended up with a nice, clean installation with a little help from under floor conduit.<\/p>\n

Funding and cost.<\/strong> Funding for the project came from three sources: a grant from the Energy Trust of Oregon<\/a>, from the OSU Student\/Incidental Fees Committee – a student body governing student fee rates and how that money is spent, and from the Recreational Sports department.\u00a0 Total project cost was in the $17-19k range.<\/p>\n

A few people have asked if they could set this up in their homes. \u00a0 Technically, yes, but it would be very expensive for one or two exercise machines.\u00a0 Maybe we should suggest that ReRev create a mini inverter? Maybe they’re working on one already…?<\/p>\n

Performance and expectations. <\/strong> As mentioned, installation went smoothly and we have a clean install but output is not quite there yet.\u00a0 When you’re one of a kind, you have to learn as you go, and that’s what we plan to do.\u00a0 We are a research university, after all!<\/p>\n

Regarding output, we are seeing per machine production in the 15-40 watt range, with some peaks much higher.\u00a0 But sadly, short duration peaks are not where you make much energy (this is the difference between kilowatts and kilowatt-hours).\u00a0 We would like to see sustained outputs in the 50 watt range to be closer to our expectations.\u00a0 I should point out, however, that this is the largest installation of it’s kind in the world – at this level of innovation, our original targets were guesses in the dark.\u00a0 Nowhere else are these machines interacting with so many others.\u00a0 We are working with the vendor and will continue until we have tried tweaking every possible aspect to get maximum electrical output.\u00a0 I will update this blog and the sustainability website<\/a> as we learn more.<\/p>\n

Payback and benefits. <\/strong> I’ve received a lot of questions about the “payback” for this project.\u00a0 Strictly financially, it’s not great.\u00a0 Even accounting for building air conditioning (cooling) savings plus the expected electrical output, financial break-even is over 20 years.\u00a0 But it’s is similar to many energy technologies during early stages of development.\u00a0 This technology is not unlike photovoltaic, which faces large financial hurtles but is still recognized as one of the biggest players as a renewable energy solution for the future.\u00a0 A university environment where innovation is fostered makes for the perfect living laboratory for wacky things like inverters hooked to exercise machines.\u00a0 And for the technology to be perfected.<\/p>\n

Remember, conservation is almost always the cheapest way to reduce energy costs and environmental impact.\u00a0 And even though this is not a conservation project, I think it will have a significant conservation impact.\u00a0 In what other way can you equate your sweat volumes to one of the dozens of everyday uses of electrical power?\u00a0 How long do you have to pedal to run your iPod all day, or to watch TV for an hour?\u00a0 (Flat panel or CRT TV?)\u00a0 How much extra time to have to stay on the machine to “pay for” those extra five minutes of hot water in the shower this morning?<\/p>\n

As my friend Jan Schaeffer from the Energy Trust said, “This gives you a whole new relationship with a kilowatt hour.”<\/strong><\/p>\n

My hope is that this new relationship fosters awareness in the non-choir – the masses who haven’t thought about their energy consumption much until now.\u00a0 If in that way OSU’s productive ellipticals reach even a few people, the return will outlast and out-reach this fun little project.<\/p>\n

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With apologies for the gap between blog entries, I thought it might be time to write a little (or a lot) more about the installation of “human power” harvesting at our Dixon Recreation Center. The press coverage OSU received as a result of this innovative installation exceeded even my expectations, and responses have been overwhelmingly […]<\/p>\n","protected":false},"author":784,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1292103],"tags":[],"class_list":["post-59","post","type-post","status-publish","format-standard","hentry","category-energy"],"_links":{"self":[{"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/posts\/59","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/users\/784"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/comments?post=59"}],"version-history":[{"count":0,"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/posts\/59\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/media?parent=59"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/categories?post=59"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.oregonstate.edu\/ecologue\/wp-json\/wp\/v2\/tags?post=59"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}