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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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Presentation Transcript
table of contents

Recap – Disassembly & Analysis Conclusions

Redesign – Use Phase and Additional Improvements

Conclusions – Total Impact Reduction

Table of Contents
disassembly explosion diagram
Disassembly- Explosion Diagram

use phase key design changes
Use Phase – Key Design Changes
  • Insulated Coffee Carafe
  • Heating Element Location
  • Stainless Steel Reusable Filter
  • 8-cup Water Capacity
redesign insulating carafe
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
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
  • =1182.6MJ/lifetime

Life time energy saving


57% cut in energy consumption

usage adjustments reusable filters
Usage Adjustments – Reusable Filters

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

usage adjustments reduction in water capacity
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
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 (
redesign calculating energy gains1
Redesign – Calculating Energy Gains

Saves Approximately 18 MJ Per Unit



  • 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
Final Conclusions and Changes

Insulated Carafe

Reusable Stainless Steel Filter

8-Cup Water Capacity

Location of the Heating Element

works cited
Works Cited