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Introduction

Motivations For study

  • Overheating during sleeping

  • Potential health risks for kids and elderly

  • diminished quantities of all sleep stages

Problem Description 

  • humidity in the sleeper’s micro-climate

  • Limiting air flow

  • Limiting heat dissipation

Design Objective

  • Improving cooling properties

  • consider both materials and device design.

  • improved air flow, high heat capacity and conductivity, and moisture wicking capabilities

The Matrix

The top component (dark orange) is the Tencel fabric and directly below that is latex foam. Stretch mesh fabric is shown in pink and the silicone-graphite matrix is shown in black.

Shredded foam (white pieces) act as support for the grid, while a layer of standard memory foam (blue) is at the bottom for extra comfort.

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Test Methods and Results

Traditional Cooling

  • Vertical Rate of heat transfer 

  • Thermal conductivity and thickness of the uppermost mattress layers

  • Hot plate as human temperature with two sensors

  • Prove silicon in matrix improves the thermal performance of the mattress

  • Determine the cooling capabilities

  • Rate of air through a known sample area

  • Using the Sheffield air porosity meter

  • Using a modified vacuum system with a tunnel and a pressure gauge.

  • Movement of liquid by capillary action

  • Measuring vertical wicking, moisture retention,and drying time of tencel and rayon

  • Based on AATCC standards

  • Adjustment of temperature based on the relationship between ambient temperature and humidity

  • Tracking the temperature and humidity level over time

  • Knit tencel and rayon are compared

  • BME280 sensor wired to an Arduino sensors, and put it between legs

Moisture Management

Comfort

  • Recovery test

  • Based on ASTM standard D3574Rate of air through a known sample area

  • Results as Sag factor

  • Thickness loss and firmness

  • Using a robotic arm the make repeated compression pressing

  • Percent of thickness vs number of cycle of compression

Our Team.

We are the Recreational Sleepers!

We are a team of Material Science and Engineering students who have a passion for excellent product design and sleep quality.

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Elijah Tan

Moisture Control

LinkedIn

White Bedroom

Dio Oey

Air Flow Testing

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