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Ecowatt. Biobattery. Calvin College Engineering Senior Design Team 10 March 28, 2008. Outline. Introduction Design MFC Power Regulation System Monitoring Feed/Waste System Budget Moving Forward. Team 10: Members. Jared Huffman. Chris Michaels. Achyut Shrestha. Brianna Bultema.

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Presentation Transcript
Biobattery

Ecowatt

Biobattery

Calvin College

Engineering Senior Design

Team 10

March 28, 2008


Outline
Outline

  • Introduction

  • Design

    • MFC

    • Power Regulation

    • System Monitoring

    • Feed/Waste System

  • Budget

  • Moving Forward


Team 10 members
Team 10: Members

Jared Huffman

Chris Michaels

Achyut Shrestha

Brianna Bultema


Project division
Project Division

Four Main Parts of Our Biobattery Project

  • Microbial Fuel Cell

  • Electrical Monitoring

  • Electrical Regulation

  • Feeding and Case Design

Introduction

Design

Budget

Moving Forward


How microbial fuel cells mfc work
How Microbial Fuel Cells (MFC) Work

Story of Electrons:

  • Anode

    • Electrons from Acetate to Geobacter

    • Geobacter sends electrons outside itself to electrode

  • Cathode

    • Electrons combine with Oxygen and Protons to form water

Schematic courtesy of Derek R. Lovely

(Microbial Energizers: Fuel Cells the Keep Going?)

Introduction

Design

Budget

Moving Forward


Microbial fuel cell design
Microbial Fuel Cell Design

  • Species: Geobacter Metallireducens

    • Most Efficient Colonization and Power Density

    • Widely tested

  • Membrane: Cellophane vs Nafion

    • Balance Cost and Permeability

  • Electrode: Carbon Cloth vs Carbon Porous Block

Introduction

Design

Budget

Moving Forward


Design goals
Design Goals

  • USB Power output

    • 5V, 5% tolerance

    • 0.1-0.5A

  • Refillable Food Supply with Alert

    • Semi-Continuous

  • System Monitoring

    • User friendly

    • Indicates Failure Mode

  • Improved Power/Volume Ratio

    • Anode Cube

Introduction

Design

Budget

Moving Forward


Anode cube
Anode Cube

Waste Output

Food Input

Electrode Location (Each Face)

MFC Design

Regulation

Monitoring

Food/Waste

Budget


Design
Design

  • Fuel cell arrangement and composition

    • Will use a combination of serial and parallel circuit design

      • Lower chance of battery and circuit failure

Introduction

Design

Budget

Moving Forward


Design1
Design

  • Regulation

    • Must output 4.75V-5.25V and 100mA-500mA for USB compatibility

    • Must overcome low current problem

    • Must step up voltage from about 3.3V to 5V

    • Will use the Maxim MAX1524 Boost Controller

Introduction

Design

Budget

Moving Forward


Regulator circuit
Regulator Circuit

Fig. Regulator circuit

Introduction

Design

Budget

Moving Forward


Parallel vs series configuration
Parallel vs. Series Configuration

Regulator

Regulator

M

F

C

M

F

C

Fault signal

Fault signal

Monitor

Monitor

Fig. Parallel configuration

Fig. Series configuration

Introduction

Design

Budget

Moving Forward


Parallel configuration
Parallel configuration

  • Parallel configuration of regulator and monitor circuits

    • Preserve system integrity

Introduction

Design

Budget

Moving Forward


Mfc monitor design
MFC Monitor Design

  • Goal

    • Monitor the status of the system and communicate relevant status to user

  • Requirements

    • Update user the system status

      • feed and waste removal

      • voltage produced by MFC

      • circuit integrity, for e.g. over-current, short circuit

    • Use minimum power to monitor the system

    • User friendly

    • Components RoHS compliant and lead free

Introduction

Design

Budget

Moving Forward


Mfc monitor design1
MFC Monitor Design

Voltage output from MFC

Feed/waste removal signal

ADC

micro-controller

Fault signal

LCD

Fig. Block diagram

Introduction

Design

Budget

Moving Forward


Monitor design
Monitor Design

Initial State

Vin MFC

Waste Interrupt

Output interrupt

alert

warning

good

bad

Fig. State Machine

Introduction

Design

Budget

Moving Forward


Mfc monitor design2
MFC Monitor Design

  • AVR butterfly kit

    • Atmega169 micro-controller

    • 10 bit ADC & LCD

    • Low power consumption: < 500µA

    • RoHS compliant

    • No speciality hardware/software need for programming

Fig. Block diagram

Introduction

Design

Budget

Moving Forward


Feeding and waste system
Feeding and Waste System

  • Food Solution Bladder

  • Tubes and Valves

    • Thumbscrew Valves to Control Rate

    • One Way Valves to Prevent Backflow

  • Cubes Fed in Sets of 2, Bottom to Top

  • Waste Tank

Introduction

Design

Budget

Moving Forward


Feeding and waste system1
Feeding and Waste System

Food Solution Bladder

Filled by User Periodically

Cathode

Tank

Anode Cube

Anode Cube

Anode Cube

Anode Cube

Waste Tank

Emptied by User Periodically

Introduction

Design

Budget

Moving Forward


Decision making process
Decision-Making Process

  • Brainstorm (Group and Individual)

  • Discuss Design Requirements

  • Research

  • Design

  • Present Design to Team

  • Refine Design

  • Present Refined Design to Team

  • Order Parts

  • Assembly

  • Testing

Introduction

Design

Budget

Moving Forward


Budget
Budget

  • Preliminary Budget estimation = $750

  • Spent

    • Geobacter & media

    • Testing components such as tubes,

    • AVR butterfly kit

    • $350

Introduction

Design

Budget

Moving Forward


Budget1
Budget

  • Planned

    • Electrodes and membrane

    • Feeding and waste system

    • Electrical components

    • $400

Introduction

Design

Budget

Moving Forward


Budget2
Budget

  • Donation

    • Test equipments from chemistry and biology departments

    • Plexiglas, carbon cloth and membrane

Introduction

Design

Budget

Moving Forward


Obstacles and plans
Obstacles and Plans

  • Case design

    • Need to find a tank for the cathode

    • Need to select and acquire a feed bladder

    • Must find a waste tank

    • Must select an appropriate feed rate

Introduction

Design

Budget

Moving Forward


Obstacles and plans1
Obstacles and Plans

  • Bacteria testing

    • Must have a bio-film formation on the electrode

    • Need to select a secondary, non-competitive aerobic bacteria

    • Plan to allow Geobacter to colonize electrodes before applying secondary bacteria

    • Plan to create a large supply of media

Introduction

Design

Budget

Moving Forward


Obstacles and plans2
Obstacles and Plans

  • Electrical regulation

    • Need to order parts

      • Need SchmartBoard to solder surface mount parts

    • Need to test circuit in lab

  • Electrical monitoring

    • Need to interface the different components with the monitoring system

    • Complete system test

Introduction

Design

Budget

Moving Forward