June 14, 2015
June 14, 2015
June 17, 2015
Energy Conversion and Conservation
26.599.1 - 26.599.14
Energy Harvesting with Piezoelectric Devices through Air Conditioning CondensersPiezoelectric energy harvesting is a method that alters mechanical energy into electrical energyby straining a piezoelectric material. Strain or deformation of a piezoelectric material causescharge separation across the device, producing an electric field, and resulting in a voltage dropproportional to the stress applied. The oscillating system is typically a cantilever beam structurewith a mass at the unattached end of the lever, since it provides higher strain for a given inputforce. The voltage produced varies with time and strain, effectively producing an irregular ACsignal on the average. Piezoelectric energy conversion produces relatively higher voltage andpower density levels than an electromagnetic system. If the piezoelectric material is not shortcircuited, the applied mechanical stress induces a voltage across the material. Basically,vibrations can be converted to electricity using a piezoelectric effect. The most common type ofdevice used to scavenge vibration energy is a cantilever piezoelectric device, which generateselectricity by bending, shaking, and deforming.Several on-campus air conditioning units are used to determine potential sources of waste energyfound in an air conditioning condenser unit and energy harvesting methods are devised. Thesemethods of energy harvesting are called vibration and airflow-driven energy harvesting usingpiezoelectric devices. The objective is to generate power from the exhaust airflow (analogous tojet engine afterburners, but on a much smaller scale). For the piezoelectric device, the idea is tomake the device vibrate to generate power.Students and faculty in a engineering technology program studied air conditioning units todetermine potential sources of waste energy. Measurements are made to determine operationaltime based on seasons, vibration levels, and exhaust fan flow from a condenser. This study usedtwo different sizes of condenser units. Measurements were taken and compared to calculatedpotential power to be harvested from the condenser. This undergraduate research project is oneof several campus-wide efforts to promote energy conservation and to investigate the use ofclean renewable energy resources. All the steps, analysis, and student involvement and outcomeswill be detailed in the paper and presentation.
Yildiz, F., & Dakeev, U., & Baltaci, K., & Coogler, K. L. (2015, June), Energy Harvesting from Air Conditioning Condensers with the Use of Piezoelectric Devices Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.23937
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