TemperSure Shower Temperature Control System1

Shower Temperature Control System Tempero SystemsStephen Au-Yeung

Francis MerinVictor Tai

Jason Wong

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Overview

• Problem• Vision• Features• TemperSure• Costs• System Components• Functional Deviation• Obstacles Encountered• Experiences• Outlook• Conclusion

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Problem

• Study done by Health Canada on pediatric hospital cases

Put into hot water,

12.30%

Accidental temperature

change, 32.40%

Other Cases, 55.30%

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Vision

• Existing solutions– Expensive

• Mission– Affordable– Safe

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Solution

• Our solution: The TemperSure System

• Goals: Attain and maintain water temperature

• Features– Automatic temperature adjustment– Temperature monitoring– Anti-scalding provisions– Simple user interface

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TemperSure

• Potential markets– Retirement homes– Hospitals– Hotels– Homes with small children or elderly

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Costs• Cost of major components

Solenoid Valve $130.00

Thermocouple $90.00

Motors $170.00

Valves $40.00

Motor Electronics $50.00

User Interface $50.00

Plumbing $60.00

Total $590.00

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System Components

User Interface

Temperature Controller

Anti-Scald Mechanism

Motorized Valves

Input/Output

Output

Sensors

Feedback

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Temperature Acquisition

• K-Type Thermocouple– Wide range of temperatures– Accuracy– Fast response time– Durable

• Direct contact with water flow

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Temperature Adjustment

• Custom fitted Motorized valves

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Temperature Adjustment

• Valves respond to temperature changes

• Firmware control– Limits temperature range to prevent

undesirable temperature changes

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User Interface

Decrease Temperature

Increase Temperature

Toggle Current Temperature

Blinking Display as activity indicator

Power Button

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Anti-Scalding

• Prevents water temperature over 45°C

• Solenoid on/off valve• Manual override

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Functional Deviation

• Non-independent anti-scald unit– Power restrictions

• User interface– Decreased functionality

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Obstacles Encountered

• Valve selection– Gate valve– Ball valve

• Valves: Water flow vs. valve position

• Plumbing

• Motor unit

• Sensors

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Experiences

• Water adds difficulty to project

• Try to keep to area of expertise

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Outlook

• Independent anti-scalding unit– Size reduction through PCB– Battery or self powered– Smaller solenoid valve size

• Improve control algorithms

• Precise flow control

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Conclusion

• Summary

• Acknowledgements– Chao Cheng– Gary Houghton

• Questions

• Demonstration