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Related Concept Videos

Frost Action on Concrete01:27

Frost Action on Concrete

Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
Frost Resistant Concrete01:29

Frost Resistant Concrete

Concrete's susceptibility to frost damage during freeze-thaw cycles demands strategic measures to enhance its frost resistance. Employing techniques like air entrainment, adjusting the water-cement ratio, proper curing, and selecting appropriate aggregates are essential.
Introducing microscopic air bubbles into the concrete mix through air entrainment creates small voids that accommodate ice expansion, thereby reducing internal pressures and preventing cracking. The optimal amount of entrained...

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Related Experiment Video

Updated: Jun 26, 2026

Dry Film Photoresist-based Electrochemical Microfluidic Biosensor Platform: Device Fabrication, On-chip Assay Preparation, and System Operation
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Additive Manufacturing of a Frost-Detection Resistive Sensor for Optimizing Demand Defrost in Refrigeration Systems.

Martim Lima de Aguiar1,2, Pedro Dinis Gaspar1,2, Pedro Dinho da Silva1,2

  • 1Department of Electromechanical Engineering, University of Beira Interior, Rua Marquês d'Ávila e Bolama, 6201-001 Covilhã, Portugal.

Sensors (Basel, Switzerland)
|January 8, 2025
PubMed
Summary

A new resistive frost-detection sensor, made with 3D printing, accurately detects frost on refrigeration systems. This technology improves energy efficiency by enabling demand-defrost control, reducing costs and enhancing performance.

Keywords:
3D printingadditive manufacturingconductive filamentdemand defrostingfrost detectionfused filament fabricationheat exchangerrefrigeration systemsresistive sensortemperature sensor

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sensor Technology

Background:

  • Frost accumulation on refrigeration heat exchangers reduces efficiency and increases energy consumption.
  • Conventional timed defrosting is inefficient as it doesn't account for actual frost levels.
  • Frost-detection sensors are crucial for optimizing defrost cycles and improving system performance.

Purpose of the Study:

  • To develop and evaluate a novel resistive frost-detection sensor.
  • To enhance demand-defrost control in industrial refrigeration systems.
  • To leverage additive manufacturing for cost-effective sensor fabrication.

Main Methods:

  • Fabrication of a resistive frost-detection sensor using Fused Filament Fabrication (FFF) with conductive filament.
  • Testing the sensor's performance in detecting frost on a heat exchanger under controlled conditions.
  • Validation of sensor measurements using a computer vision method.

Main Results:

  • The sensor reliably detected frost in all tested scenarios.
  • Sensor performance was validated against a computer vision method, confirming its accuracy.
  • The developed sensor demonstrated the capability to detect temperature changes.

Conclusions:

  • The developed 3D-printed frost-detection sensor is effective for real-time frost monitoring.
  • This technology enables optimized demand-defrost control, leading to improved energy efficiency in refrigeration systems.
  • Additive manufacturing offers a pathway for creating customizable, cost-effective, and compact sensor solutions.