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Wednesday
Sep232009

Energy Generation from the Building

On site energy production is important for the success of the smartFARM.Solar and wind will be needed for the production of this energy, but whatabout the structures that uses all the energy? It is possible to generateenergy from the movement of the structures with piezoelectricity.Piezoelectric energy is generated from converting strain, caused fromdeformations, into electricity. The problem with piezoelectricity (just likesolar or wind power generation) is that some type of movement is needed tocreate the energy. For the piezoelectricity to work properly, the structureneeds to endure some type of strain from cyclic loading. Taking a wind stormfor example, we might already have wind turbines to generate electricity butwe can generate small amounts of additional energy from the loads on thebuilding that would otherwise be wasted.

Structures are designed to minimize the amount of movement so people insideof them do not notice the effects caused from loading. Take for example aceiling joist. They are designed to meet certain deflections requirements.These requirements come from material properties, but not only of the joistitself. The drywall that is attached to the system can only deflect so muchbefore cracking and looking like the ceiling might fall down. Also, if thereis too much deflection on a floor system, it can cause a wave like effectthat can make people feel seasick. The structure needs to be designed withconsideration for how people react to different situations, while maximizingthe deflections that cause strain. Other buildings, such as the greenhouseand barn can be designed without the human element being considered.

These structures should be able to handle more deflections and strainbecause people will not be in them during high wind events. They need to bedesign to maximum capacity and be very flexible to create higher strainswhich will generate more electricity for the farm. Like the drywall in theinterior of a building, the skin of the greenhouse needs to be consideredwhile designing the frame. If it deflects too much, it might cause theexterior to crack and break changing the inside environment that wassustained before the event. More flexible greenhouse skins (and interiorfinishes of the building) need to be used in order to generate the maximumabout of energy from the structure.

Kyle Holman

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