# Mr. Coffee – Redesign and Conclusions - PowerPoint PPT Presentation

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Industrial Ecology – Spring 2012. Mr. Coffee – Redesign and Conclusions. Recap – Disassembly & Analysis Conclusions Redesign – Use Phase and Additional Improvements Conclusions – Total Impact Reduction. Table of Contents. Disassembly- Explosion Diagram.

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Mr. Coffee – Redesign and Conclusions

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#### Presentation Transcript

Industrial Ecology – Spring 2012

### Mr. Coffee – Redesign and Conclusions

Recap – Disassembly & Analysis Conclusions

Redesign – Use Phase and Additional Improvements

Conclusions – Total Impact Reduction

### Disassembly- Explosion Diagram

Carbon and Energy Totals

### Use Phase – Key Design Changes

• Insulated Coffee Carafe

• Heating Element Location

• Stainless Steel Reusable Filter

• 8-cup Water Capacity

### Redesign: Insulating Carafe

• Dual shell vacuum insulation.

• Minimal points of contact.

• Minimal heat loss by conduction.

• Keeps coffee warm at 160F (71C) for up to 6 hours.

• No need for reheating of coffee

### Redesign: Result of Insulating Carafe

• Heat transfer by conduction.

• Heat transfer is minimized by the coefficient of thermal conductivity of insular material.

• Heat transfer is minimized by the insulation thickness.

• Energy Calculations.

• - Input at 900watts

• -10min/day on time

• Energy = 900J/s*600s=540kJ/day

• Life time = 6yrs

• Energy = 540kJ/day*365day*6years

Life time energy saving

2770MJ-1182.6MJ=1587MJ

57% cut in energy consumption

### Usage Adjustments – Reusable Filters

Saves up to 334.3 MJ of energy and 7.5kg of CO2

### Usage Adjustments – Reduction in Water Capacity

Original Use Water Consumption: 93,220kg

By reducing capacity to 8 cups, an estimated reduction in daily use is 2 cups

Total Use = 74,661kg

New Water Consumption:

Water Savings: 18,559kg

### Redesign – Eliminating water transport in Use phase

• Assumptions:

• The entire reservoir,8 cups is transported through the machine in approximately 10 minutes

• The Coffee is warmed to 90.5-96C (Environmental impacts of different methods of coffee preparation by Eva Brommer,BrittaStratmann and Dietlinde Quack)

• Energy losses can be directly correlated to energy savings.

• Room temperature is 23 degrees Celsius.

• The tubing is a perfect cylinder of length .3556 meters

• Coefficient of Thermal Conductivity of the Tubing is .13 W/mK (http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html)

### Redesign – Calculating Energy Gains

Saves Approximately 18 MJ Per Unit

### Conclusion

Comparability:

• Costs – New Design is in the same price bracket as original

• End-of-Life – Both glass and stainless steel can be recycled

Significant Findings:

• Insulated carafe is responsible for the most dramatic energy savings

• Stainless steel would be an easy substitute for the glass carafe

### Final Conclusions and Changes

Insulated Carafe

Reusable Stainless Steel Filter

8-Cup Water Capacity

Location of the Heating Element