Power System for the Better Water Maker P14418

Size: px

Start display at page:

Download "Power System for the Better Water Maker P14418"

Hubert Hunt
5 years ago
Views:

1 Power System for the Better Water Maker P14418

2 Agenda Background Problem Statement and Project Plan Customer Needs and Engineering Requirements Constraints and Design Drivers Project Risk Assessment System Analysis House of Quality Results Functional Decomposition Pugh Analysis Individual Concepts and Architectural Developments Concept and Schematic Risk Assessment Initial Cost Estimate Test Plan

Problem Statement The Better Water Maker was developed to disinfect water in nations with high mortality rates due to poor water and sanitation systems.

3 Problem Statement The Better Water Maker was developed to disinfect water in nations with high mortality rates due to poor water and sanitation systems. The goal of our team is to provide a low cost, efficient power generation system for the Better Water Maker that does not tire the user, while it is fun and easy to use.

4 Project Plan

5 Customer Needs (Critical) Primary needs Generate adequate power Is not tiring Reduced cost Maintain durability

6 Engineering Requirements Generate 25 Watts Can be used for at least 5 minutes Costs less than $150 Lasts for at least 180,000 gallons of water

7 Constraints & Design Drivers Key Design Drivers Functionality, Reliability, Cost, Usability, Manufacturability Durability, Efficiency Constraints Cost, Size, Weight, Strength of User

8 System Analysis: HOQ Results Four highest weighted needs: Ease of Repair Cost Unit Life Effort Required

9 Functional Decomposition

10 Timing Diagram

11 General Process Flow Chart

12 Pugh Analysis

13 Pugh Analysis

14 Pugh Analysis

15 Solar Concept: Schematic Acquire Water Communicates Readiness to User Plug in BWM Hook up Battery Dispense Water

16 Engineering Analysis Assumptions: 30W Solar Panel Surface Area: m^2 Efficiency: 18% 2-axis rotation Clear-sky analysis BWM requires W

19 Solar Insolation by Region

20 Port-au-Prince, Haiti Sun Chart: Hot Climate

21 Nepal Sun Chart: Cooler Climate

22 Calculations for 20 Latitude: Haiti 8AM to 4PM availability Shade drastically reduces power

23 Solar Concept: Risk Assessment By Importance Reliability Weather Time Shading Theft Additional Controls Cost Component Battery Shipping Cost Safety Life

24 Solar Concept: Cost Analysis 30W Monocrystalline Solar Panel 18V- $ Axis Stand- $20-$30 AC Converter- $20 Wire extension- $10 12V lead acid battery - $30 Total Cost: ~$150 May end up outside budget, but the system will provide power for any device.

25 Solar Concept: Test Plan Use multimeter to verify the power. Measure the power if a cell is shaded. Collect data on battery charging capability. Test ability of a child to use from start to finish. Obtain a survey from users on its ease of use.

26 Leg-powered Concept Recumbent Bicycle Direct- or Chain-Drive Pros More power in legs than arms Less tiring than current design Higher efficiency than current Possibility to reduce amounts of motors Cons Might add cost High forces on seating structure More complicated setup than current design Less portable than current

27 Leg-powered Concept: Schematic Backrest Current Generator Pedals Mounted on Crankshaft Seat 2x4 Bucket Pedals Mounted on Separate Sprockets Seat Current Generator

28 Risk Assessment Large forces in system More complicated setup Reduced component life Complex seating requirements

29 Design Architecture Feature Seat Crank and Motors LEDs Wires, Chain, and Sprocket Function Accomplished Place User Generate Power Communicate to User Transfer Power

30 Leg-powered Concept: Cost Analysis Crankset - $10-20* Pedals - $4* Chain - $10 Keyed Shaft - $10-17* Sprocket - $5-10 Chain Drive - $39-61 *Direct Drive - $24-41

31 Leg-powered Concept: Test Plan Have volunteers test for comfort Measures forces on seat and pedals Can run for 5 minutes or more Run generator while attached to a voltmeter Ensure voltage is limited correctly

32 Spring Concept: Schematic Single Jump Platform Swing Double Jump Platform

33 Risk Assessment Solenoids create heat o Proper heat sink Springs could break o Properly constrained Solenoid plunger must be correctly aligned o Prevent improper movement Oscillations may be erratic o Use bridge rectifier

34 Spring Concept: Design Architecture Feature Casing/Spring Enclosure Solenoid Springs Rectifier Function Accomplished Place User Generate Power Facilitate Power Generation Regulate Power

35 Spring Concept: Cost Analysis Springs - $3-10 each Solenoid - $15-30 each Rectifier - $ Plywood casing - $5-10 per setup Rope/chain - $0.70/ft Swing - $30-68 Single Jump Platform - $26-63 Double Jump Platform - $52-123

36 Spring Concept: Test Plan Test the components for each output individually o Verify with expectations Test the ergonomics of the setup to determine whether it requires less effort than the original design Bring children in to set up and use the apparatus Use DOE tools to validate the testing results

37 Recommendations: Solar Concept: o Has great potential, even beyond BWM, but has high risk in reliability and cost. Leg-Powered Device o High reliability in combination with low cost and OTS components make this a desirable concept. Spring Concept o Unknown reliability of power; this will need more anaysis before moving forward, but it has great potential to be fun and easy to use, as well as low in cost.

38 Questions and Comments?

39 Springs (Century Spring Corp.) P/N: 7052 $3.84 OD: 1in P/N: $5.31 OD: 1in Length: 3in Max. displacement: 1.2in Length: 4.45in Max. displacement: 1.2in k: 51lb/in Max. load: 60lb k: 53lb/in Max. load: 64lb P/N: 7056 $8.96 OD: 1.219in P/N: $8.66 OD: 2.125in Length: 4in Max. displacement: 1.2in Length: 5.38in Max. displacement: 4in k: 99lb/in Max. load: 118lb k: 5.5lb/in Max. load: 22lb P/N: S-3159 $13.20 OD: 2.875in P/N: D-1306 $5.73 OD:.375in Length: 3in Max. displacement: 1.4in Length: 3in Max. displacement: 0.9in k: 15lb/in Max. load: 20lb k: 42lb/in Max. load: 38lb

40 Solenoids (ElectroMechanics Online) P/N: S $27.73 P/N: S $22.40 Pull-type 18W Pull-type 16W Long Pulse 25% Duty Cycle Long Pulse 25% Duty Cycle Max. on-time: 50s Actuation Length: <1.6in Max. on-time: 20s Actuation Length: <1in P/N: S $22.40 Pull-type Intermittent Max. on-time: 75s 8W 50% Duty Cycle Actuation Length: <1in

41 Rectifiers (Mouser Electronics) P/N: 625-2KBP02M-E4 $0.58 Current: 2A Peak reverse voltage: 200V Max. current surge: 60A Single Phase Bridge-style P/N: 625-PB4006-E3 $3.02 Current: 4.4A Peak reverse voltage: 600V Max. current surge: 400A Single Phase Bridge-style P/N: 512-GBPC3510 $3.05 Current: 35A Peak reverse voltage: 1000V Max. current surge: 400A Single Phase Bridge-style

42 Gravity Feed (not power generation) Pros Possible elimination of pump (5+W) Less effort required Can be OTS Cons Needs more structural support due to higher center of mass Need to use pump to regulate flow or use gate valve and throttle valve Users need to lift water into funnel

43 Solar Power Supplement to Current BWM Design Pros: - Solar panel will reduce load on user - Redesign of current system may be minimal - Reduced learning curve for current users

44 Solar Power Supplement to Current BWM Design Cons: - Cloud cover and nighttime eliminate the improvement - Solar panels are susceptible to theft

45 House of Quality

How to: Test & Evaluate Motors in Your Application

How to: Test & Evaluate Motors in Your Application Table of Contents 1 INTRODUCTION... 1 2 UNDERSTANDING THE APPLICATION INPUT... 1 2.1 Input Power... 2 2.2 Load & Speed... 3 2.2.1 Starting Torque... 3