Title

Design of an apparatus to measure mechanocaloric effects

Document Type

Oral Presentation

Campus where you would like to present

Ellensburg

Event Website

https://digitalcommons.cwu.edu/source

Start Date

18-5-2020

Abstract

The temperatures of some materials change in response to external stimuli including applied pressure, electric fields, and magnetic fields. These are examples of i-caloric effects and they are potentially useful for designing solid-state cooling technology. Such technology could supersede traditional vapor compression refrigeration, which is energy inefficient. Refrigeration and cooling/air-conditioning constitutes approximately 20.7% of US annual electricity consumption in the residential sector and 25.8% in the commercial sector according to 2018 data from the US Energy Information Administration. Solidstate cooling, which is more energy efficient, could reduce this consumption. Uncovering new i-caloric materials with suitable properties for use in new refrigeration technology necessitates measuring their icaloric properties. In this presentation, a design for an apparatus to measure mechanocaloric effects is discussed. Mechanocaloric effects, which are a subset of i-caloric effects, occur when a material is either under applied pressure or stress. The apparatus is designed to measure the temperature of the sample material while compressed in a hydraulic press. Meaningful measurement of the temperature change of the sample requires it to be housed within a thermally insulating, but compressible cell. In addition, temperature measurements must be taken such as to allow for the calculation of entropic change due to the mechanocaloric effect, by minimizing change in temperature due to measurement. Measurements performed with such an apparatus could potentially lead to the discovery of new mechanocaloric materials that could be used in developing practical cooling methods with less energy consumption than conventional methods.

Faculty Mentor(s)

Benjamin White

Department/Program

Physics

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May 18th, 12:00 PM

Design of an apparatus to measure mechanocaloric effects

Ellensburg

The temperatures of some materials change in response to external stimuli including applied pressure, electric fields, and magnetic fields. These are examples of i-caloric effects and they are potentially useful for designing solid-state cooling technology. Such technology could supersede traditional vapor compression refrigeration, which is energy inefficient. Refrigeration and cooling/air-conditioning constitutes approximately 20.7% of US annual electricity consumption in the residential sector and 25.8% in the commercial sector according to 2018 data from the US Energy Information Administration. Solidstate cooling, which is more energy efficient, could reduce this consumption. Uncovering new i-caloric materials with suitable properties for use in new refrigeration technology necessitates measuring their icaloric properties. In this presentation, a design for an apparatus to measure mechanocaloric effects is discussed. Mechanocaloric effects, which are a subset of i-caloric effects, occur when a material is either under applied pressure or stress. The apparatus is designed to measure the temperature of the sample material while compressed in a hydraulic press. Meaningful measurement of the temperature change of the sample requires it to be housed within a thermally insulating, but compressible cell. In addition, temperature measurements must be taken such as to allow for the calculation of entropic change due to the mechanocaloric effect, by minimizing change in temperature due to measurement. Measurements performed with such an apparatus could potentially lead to the discovery of new mechanocaloric materials that could be used in developing practical cooling methods with less energy consumption than conventional methods.

https://digitalcommons.cwu.edu/source/2020/COTS/83