R11007: Open Source / Open Architecture Sustainable Water Systems
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Voice of the Engineer

Voice of the Engineer

The table below presents the engineering specifications, that will be used by the MSD team to design against. Given the customer needs, awareness of the marketplace, and resource limitations of the current project, assign preliminary engineering specifications. In addition to setting the nominal or marginal value or each specification, provide guidance to the team on the ideal value or direction that the team should strive for, once the nominal/marginal target values have been realized. The relative importance, the marginal value, and the ideal value are to be filled out by students during MSD 1.

List of Engineering Specifications
Engineering Spec. Derives from Customer Needs Relative Importance (-,1,3,9) Description Measure of Performance Engineering Units Marginal value Ideal Value Validation Method
a.1 2.1, 3.2, 3.3 Number of different harmful contaminants filtered Measure quantity of contaminants removed from highly contaminated water source with minimal time allowance. (integer) Experimental
a.2 2.1, 2.4, 3.2, Number of environments device can work in (ex. Desert, ocean, jungle, tundra, etc.) Measure the device's effectiveness in extremely diverse environmental conditions. (integer) Experimental
a.3 2.6, 3.2, 3.3 Turbidity of the water (ex. Appearance, clarity, palatability) Compare the water conditions under maximum capacity. (NTU) Experimental
a.4 2.1, 3.2, 3.3 Amount of harmful biological contaminants Measure quantity of contaminant removed from highly contaminated water source with minimal time allowance. (cfu) Experimental
a.5 2.1, 3.2, 3.3 Amount of harmful chemical contaminants Measure quantity of contaminant removed from highly contaminated water source with minimal time allowance. (ppm) Experimental
a.6 2.1, 3.2, 3.3 Amount of harmful mineral contaminants Measure quantity of contaminant removed from highly contaminated water source with minimal time allowance. (ppm) Experimental
b.1 2.6, 3.1, 3.4, 4.5 Amount of water which can be stored Measure storage capacity under maximum capacity conditions (liters) Analytical
b.2 2.6, 3.3 Shelf life before contamination Monitor water condition under maximum capacity and minimum usage. (days) Analytical/Experimental
b.3 3.1, 3.2 Input flow rate Measure flow rate under maximum capacity. (liters/day) Analytical
b.4 3.1, 3.2 Output flow rate Measure flow rate under maximum capacity. (liters/day) Analytical
c.1 3.1, 3.2 Flow rate (internal to distribution system) Measure flow rate under maximum capacity. (liters/day) Analytical
c.2 1.1, 2.1, 2.2, 2.3, 2.5, 3.1, 3.2, 4.4, 4.5 Number of customers Measure the number of customer supported under minimum device capacity. (integers) Analytical
c.3 1.1, 2.1, 2.2, 2.3, 2.5, 3.1, 3.2, 4.4, 4.5 Distance covered Measure distance covered under minimal device capacity. (meters) Analytical
d.1 2.6, 3.1, 3.2, 3.3 Indication of working vs. not working, including early warning Monitor the indicator while processing extremely different water qualities. (boolean) Experimental
d.2 2.6, 3.1, 3.2, 3.3 Measures the amount of flow through system Monitor the indicator while opening and closing water input. (boolean) Experimental
d.3 2.3, 3.1, 4.1 Budgeting or Rationing of Supply Monitor device rationing under minimum device capacity and maximum demand. (liters/(person*day)) Analytical/Experimental
e.1 2.1, 3.1, 3.2 Number of sources which can be collected from (ex. Flowing, Standing, Water Vapor , Rainwater, Animal Waste) Determine the number of extreme sources that may be utilized by device. (integer) Experimental
e.2 3.1, 3.2 Input flow rate Measure flow rate under maximum capacity. (liters/day) Analytical
e.3 3.1, 3.2 Output flow rate Measure flow rate under maximum capacity. (liters/day) Analytical

Customer Needs: 1.1:Supply water that will not exceed 15% of gross income and considered completed once below 5% of gross income; 2.1: Use a device that is compatible with multiple water sources.; 2.2: Minimized educational requirement for safe operation and environmental responsibilities; 2.3: Incorporate a concise and well organized structured action plan; 2.4: Utilize environment specific sustainable power source; 2.5: Have products readily available where required and needed; 2.6: Ensure processed water is maintained at its cleaned condition; 3.1: Own a device to meet consumption demands (2 liters/person/day); 3.2: Own a device to provide safe and clean drinking water (palatability (taste, smell, clarity)); 3.3: Available testing methods to substantiate cleanliness; 3.4: Device designed for storage and water cleaning that is robust to damage; 4.1: Strong societal support to assist with producing clean sustainable water; 4.2: Operate a device that has simple usage; 4.3: Operate a device that requires time efficient maintenance; 4.4: Limit collection time to fit within the range of 50% to 5% of current collection time; 4.5: Modified water transportation that requires less human effort.


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