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Detailed Design Review P11451

Detailed Design Review P11451. Cook Stove Test Stand Group February 4 th 2011 David Sam (ME) Huseyin Zorba (ISE) Phillip Amsler (ME). Agenda. Introduction for the Project Status Customer Needs Engineering Specifications System Level Work Risks Schedule

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Detailed Design Review P11451

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  1. Detailed Design Review P11451 Cook Stove Test Stand Group February 4th 2011 David Sam (ME) Huseyin Zorba (ISE) Phillip Amsler (ME)

  2. Agenda • Introduction for the Project Status • Customer Needs • Engineering Specifications • System Level Work • Risks • Schedule • Bill of Materials • Modifications on Test Stand • Calculations & Feasibility Analysis • Data Acquisition • Preliminary Test Plan • Process Flow Chart • Issues

  3. Meeting Purpose 1. Overview of the Project 2. Confirm its Functionality of the Design 3. Receive feedback from attendees on critical technical issues 4. Receive approval from Customer to complete design as presented 5. Receive approval from Customer to purchase materials & services for project

  4. Action List

  5. DESIGN INPUTS

  6. Customer Needs

  7. Engineering Specifications

  8. System Level Work

  9. System Level Work

  10. Fish Bone

  11. Risk List

  12. Schedule

  13. Integrated Test Strategy • Performed 1 Comparison Test • Boiling Times were found for 3 different stoves • The data outputs are shared among PM’s • New Tests with Stove Design Team • Flow Rate • Skirt Size • Pot Shape

  14. Bill of Materials

  15. DESIGN OUTPUTS

  16. Proposed Test Stand

  17. Modifications on Test Stand SET-UP TIME≈ 5 MINUTES

  18. Modifications for Measurement • OLD • NEW

  19. Modifications for Measurement OLD NEW

  20. Improved Functionality • New thermocouple mount • New steel mount to replace previous wooden mount. Mount is also insulated to reduce impact of ambient temperatures on water temperature readings. • Test stand now has two handles and larger wheels to provide easier transportation. • Test stand can be transported by one user and is very durable.

  21. Improved Mass Measurements • By sealing openings in the bottom of the test stand, “noise” in mass measurements have been improved. The impact of wind has a substantially smaller impact on the test stand. Mass measurements from Stovetec stove support the test stand improvements.

  22. Installation of CO monitor • New monitor has been installed in the exhaust stream of the test stand. • It allows USB interface to recover data instead of burdening tester with recording data every minute.

  23. Design Calculations

  24. Convective Heat Transfer • Assume Stove is a cylinder D~15”, H~20”A=.6m2 • h (air free convection) range 5-10 W/m2K • Use 10 for conservative value • Ts~600°C • T∞ range -10°C to 30°C • q=h*A*(Ts-T∞) • Hot q=3420W • Cold q=3660W • Δq =240W or ~5% of total output of stove (using 5kW output) q Stove q q

  25. Radiation Heat Transfer • Use area and temperatures from previous • Ts~600°C=873K • T∞ range -10°C to 30°C=263K to 303K • A=.6m2 • Assume Steel (ξ=.07) • q=σ*ξ*A*(Ts4-T∞4) • σ=5.6703E-8 W/m2K4 • Hot q=1363W • Cold q=1372W • Δq=9W or ~.2% of total output of stove (using 5kW output) q Stove q q

  26. Feasibility Analysis-Stove Tec

  27. Carbon Monoxide

  28. CO • In a water boil test, CO emissions should be lowest during the simmer phase, however during these three tests there is a spike or “noise” during the simmer phase in all three instances. • Hypothesis– Charcoal is shifting position during the simmer phase, creating abnormalities in CO emissions. • Test – Place stove in test stand and record emission data for Stovetec stove during combustion without pot of water. Every five minutes, stir charcoal around in stove and after recovering CO data from logger, determine if at every 5 minute interval there was a significant shift in CO emissions.

  29. Water Temperature

  30. Weight-Before

  31. Weight-After

  32. Efficiency

  33. Modified WBT Output 1-Rebar Stove Simmering starts at 16th min

  34. Modified WBT Output 2-Rebar Stove Simmering starts at 16th min

  35. Modified WBT Analysis-Rebar Stove

  36. Data Acquisition

  37. Efficiency Acquisition • Known values for the Efficiency are: Heat Capacity of Water(cp), Latent Heat (LH) of Water, Heating Value (HV) of charcoal, and Heating Value of butane. • To calculate Efficiency we need: mwater, Water Temperatures, mevaportated, mfuel, mbutane. • All of this data comes from measurement devices as well as initial and final test measurements. • To have the scale output over RS232 will require expensive software or a different model scale. Therefore we are recommending manual data input for mass only.

  38. CO Acquisition Start with calculating the flow rate.

  39. Turbulent Air Flow Cont.

  40. Volumetric Flow Calculation Numerical Integration Uniform Flow Assumption

  41. CO Output dA • When given ppm vs. time take integral using differential area with trapezoid method.

  42. CO continued • After integrating and taking sum of differential areas, then units = ppm*min • Using standard air 1ppm CO=1.23mg CO per m3 air. • ppm is a mass concentration of CO compared to the fluid it is in. • Finally convert 204 CFM to5.777 m3 /min • Then dA d(ppm) dt

  43. Particulate Matter Acquisition Concept Sampling Entire Exhaust Stream Sampling % of Exhaust Stream Advantages Can provide numerous samples during one test Capture smaller particles Can have samples sent to NTID for chemical breakdown Disadvantages No real time results Difficult to implement Dealing with heat and humidity Only provides a rank comparison • Advantages • Using a settling chamber is easy to integrate • Can obtain an absolute value for total particles collected • No moving parts • Disadvantages • No real time results • According to EPA, only particles with diameter < 75 µm would settle • Semi-volatile organic compounds would not settle

  44. Proposed Sampling System • Based off concept from last year’s Testing Team and team 10056’s design • Additional information from WBT publication, appendix 6. Emission Measurement

  45. Concept Emissions • Cyclone • Separate larger diameter particles that don’t need to be measured • Filter & Holder • Cambridge Filter & Holder system from team 10056 • Impinger • Filled with methanol to collect any remaining gaseous particles for visual analysis and to protect pump • Vacuum Pump • Find acceptable pump for system, perhaps borrow pump from Dr. Robinson’s lab temporarily Most of Exhaust

  46. Concept Analysis Advantages Disadvantages Could be difficult to integrate to maintain a mobile test stand Could impact CO monitoring which is downstream (relocation of monitor?) Does not provide an absolute value for comparison Only a rank comparison between stoves tested by RIT • Can hopefully obtain most parts from Team 10056 • With help from Dr. Hanzlik, quickly set up an experimental system to test feasibility • Filters can be sent to NTID lab for chemical composition breakdown

  47. Preliminary Test Plan

  48. Plans for MSD2

  49. Process Flow Chart (a)

  50. Process Flow Chart (b)

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