P18461: Solar Powered UV Water Purification
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Systems Design

Table of Contents

Team Vision for System-Level Design Phase

Leaving the problem definition phase we had a relatively clear image of what form our solution to our customer's problem was going to take. During the System-Level Design Phase we had intended on backtracking to challenge our solution --- which we had quickly set upon --- and consider other solutions to our customer's problem. In doing this we either would find a better solution, which we could propose to our customer, or we would develop rationale behind the selection of our original solution. We found the latter to be true in our investigation. The supporting research can be found below.

Functional Decomposition

Functional Decomposition

Functional Decomposition





























Sub-Functions Identified for System

  1. Remove Contaminants
  2. Move Water
  3. Validate Output
  4. Power Subsystems
  5. Maintain System (Not Shown in Decomposition)

Benchmarking

For Live Version of Benchmarking: Click Here

Concept Development and Analysis

For Live Version of Concept Development: Click Here

Concept Selection

For Weighted Pugh Analysis and Concept Selection: Click Here. Definitions of Concepts can be seen in the Concept Development and Analysis document.

Selected Concepts

Concept 6

Concept 6

Concept 9

Concept 9

Both Concepts are very similar, in fact the only difference between the two is that one uses an adsorptive filter, while the other uses a microfilter. The adsorptive filter mentioned in Concept 6 refers to a modified carbon block filter, which is essentially a microfilter made with a activated carbon fiber mesh that is formed in a specific way such that it does not allow for the formation of channels between the fibers. The microfilter in Concept 9 can either be a ceramic or synthetic filter, which cannot inherently remove pesticides, odors, tastes, chlorine, etc. from water by itself, which is why it requires a secondary carbon filter. The carbon block filter in Concept 6 can be easily clogged with large particulate, which is why it requires a more fine --- and therefore expensive --- prefilter as opposed to Concept 9. The small price differential should result in a large flow rate differential between the two concepts, especially with an applied pressure head.

Systems Architecture

System Flow Chart Based on Selected Concept (Concepts 6 and 9)

System Flow Chart Based on Selected Concept (Concepts 6 and 9)

Designs and Flowcharts

High Level System Schematic of Chosen Concept (Concepts 6 and 9)

High Level System Schematic of Chosen Concept (Concepts 6 and 9)

A Second High Level System Schematic of Chosen Concept (Concepts 6 and 9)

A Second High Level System Schematic of Chosen Concept (Concepts 6 and 9)

Feasibility: Prototyping, Analysis, Simulation

For UV Purification Subsystem Pipe Diameter and Flow rate Calculation: Click Here. From here we can assume that the rate limiting step, with a filter that has a relatively high flow rate (i.e. > 1 gal/min), is the filter and not the UV purification step.


Therefore we would now like to see how our potential system may stack up against other existing systems.

For this comparison: Click Here

Risk Assessment

For Updated Risk Assessments: Click Here (Changes are Highlighted in Yellow)

Design Review Materials

For Systems Design Review Presentation: Click Here

Plans for next phase


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