Thermal energy harvesting from temperature fluctuations
type: Dataset
description: The development of portable equipments, wireless sensors networks and self-powered devices in a general manner generates a strong demand for micro-energy harvesting devices. One of the most challenging ways to self power devices is the development of systems that recycle ambient energy and continually replenish the energy consumed by the system. Apart from electromechanical energy harvesting, it is also interesting to convert thermal energy, which is “available” everywhere, into suitable electrical energy. In this thesis, the thermal to electrical energy conversion from temperature fluctuations was developed and improved, and the feasibility of this technique was also confirmed by implementing the experimental experiment. Among different ferroelectric materials, PZN-4.5PT single crystal and P(VDF-TrFE-CFE) 61.3/29.7/9 mol% were chosen as active materials due to their outstanding properties under electric field. By means of some intelligent thermodynamic cycles, e.g., Ericsson or Stirling cycle, which has been presented in previous research, the efficiency of energy conversion could be improved greatly. In the first part, pyroelectric energy harvesting on PZN-4.5PT single crystals with an Ericsson cycle was mainly investigated from two aspects: frequency effect and phase transitions. It was shown that the harvested energy demonstrated a nonlinear decrease with an increase of frequency, and the optimal use of the phase transitions during the Ericsson cycle could greatly improve the harvested energy by choosing the appropriate working temperature range. Based on it, two asymmetric Ericsson models (L-H and H-L cycles) were attempted successfully, and it was confirmed that the H-L cycle is the most effective thermal energy harvesting cycle for this material. The second part concentrated on electrostatic energy harvesting by nonlinear capacitance variation on P(VDF-TrFE-CFE) 61.3/29.7/9 mol% terpolymer. Ericsson cycle was tested experimentally between 25 and 0°C and compa…
landing page: https://theses.hal.science/tel-00698421
identifier: NNT: 2011ISAL0086
keyword: conversion-energetique
keyword: energetique
keyword: energie-thermique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: physcondcm-genphysics-physicscondensed-matter-cond-matother-cond-matother
keyword: recuperation-denergie
keyword: temperature-fluctuations
keyword: thermal-energy
keyword: thermodynamics
keyword: thermodynamique
keyword: theses
issued: 2026-05-18T12:00:03.602487
modified: 2026-05-18T12:00:03.602493
language: en
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Thermal energy harvesting from temperature fluctuations
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00698421
issued: 2026-05-18T12:00:03.631496
modified: 2026-05-18T12:00:03.559907