Analysis of the efficiency of a dielectric solar energy collector

Lampinen, Markku J.; Kirjavainen, Kari; Pylkkänen, Thomas

doi:10.1016/0360-5442(91)90036-l

Cited by 4 publications

(1 citation statement)

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“…Other possible applications of cellular or porous space-charge electrets should, however, also be briefly mentioned: Based on theoretical considerations of thermally induced capacitance changes, a thermoelectrical energy converter was proposed [63]. The reported pyroelectric properties of polymer-foam electrets [36] might be used in multi-functional sensor systems with one single sensor material, but different modes of operation.…”

Section: Suggested and Demonstrated Applicationsmentioning

confidence: 99%

Voided polymer electrets - new materials, new challenges, new chances

Gerhard

Proceedings. 11th International Symposium on Electrets

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In this review, the development of cellular propylene as an electret-transducer material since the mid-eighties is described, and the accompanying research into the origins of (quasi-)ferro-, pyro-and piezoelectric effects in voided polymer electrets is discussed in some detail. In this context, the most relevant charging and measuring techniques for piezo-and pyroelectric polymer-foam electrets are introduced. Porous fluoropolymer electrets and their investigation as single-or multiple-layer piezoelectrics are considered in view of their better thermal and temporal stabilities. Finally, some proposed applications of voided polymer electrets are mentioned.

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Section: Suggested and Demonstrated Applicationsmentioning

confidence: 99%

Voided polymer electrets - new materials, new challenges, new chances

Gerhard

Proceedings. 11th International Symposium on Electrets

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Thermodynamics of dielectric systems depending upon three variables

Bisio

Rubatto

2000

Energy Conversion and Management

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Porous PTFE space-charge electrets for piezoelectric applications

Gerhard

Künstler

Gome³

et al. 2000

IEEE Trans. Dielect. Electr. Insul.

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Porous polytetrafluoroethylene (PTFE) films were positively or negatively corona charged at room or elevated temperatures. Their charge storage behavior was investigated by means of isothermal surface potential measurements in direct comparison to nominally nonporous samples of the same polymer. It was found that porosity may lead to significantly enhanced surface-charge stability for both polarities. Direct piezoelectricity was studied on quadruple, double, and single layer samples by means of quasi-static measurements. For the determination of indirect piezoelectricity, frequency-dependent acoustical-transducer experiments were carried out. Both applications-relevant measurements yielded piezoelectric d33 coefficients of up to approximately 600 pClN or 600 pmlV. These values are more than one order of magnitude higher than in conventional piezoelectric polymers such as polyvinylidenefluoride (PVDF) and almost comparable to the highest known values of inorganic piezoelectrics. Consequently, the novel piezoelectric porous-fluoropolymer spacecharge electrets exhibit an outstanding potential for various device applications that are very briefly discussed.

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Analysis of the efficiency of a dielectric solar energy collector

Cited by 4 publications

References 0 publications

Voided polymer electrets - new materials, new challenges, new chances

Voided polymer electrets - new materials, new challenges, new chances

Thermodynamics of dielectric systems depending upon three variables

Porous PTFE space-charge electrets for piezoelectric applications

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