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Exploration of 21st century flameless cooking

Exploration of 21st century flameless cooking

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Exploration of 21st century flameless cooking

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  1. Exploration of 21st century flameless cooking Y.W.C.A. HIOE TJO YOENG COLLEGE BPh70

  2. Exploration of 21st century flameless cooking 廿一世紀之無火煮食研究

  3. Flow1. Background2. Design of the Project3. Procedure4. Result5. Conclusion / Implication

  4. What is gas cooking? Flameless cooking? Gas cooking means cooking that with flames ! Flameless cooking means cooking that without flames!

  5. In the past… We used fossil fuels in an unrestrained way……

  6. In the present…

  7. In the future… • Cooking will still be essential in our daily lives • Flameless cooking can be carried out to reduce the fossil fuels used for cooking

  8. Survey conducted by Y.W.C.A. Hioe Tjo Yoeng College

  9. Design of our project

  10. Procedures of Experiments

  11. Preparations of food samples Egg custard vitamin C solution Liquidized tomato paste

  12. Food Samples cooked by: • Electric cooker • Microwave oven • Solar cooker • Town gas cooker

  13. All the food samples ( egg custards, vitamin C dissolved solutions and liquidized tomato paste) were cooked by a CONSTANT amount of energy, which is 211.2kJ CONSTANT

  14. Take the initial and final temperatures of the cooked food samples

  15. Biuret test • Add sodium hydroxide solution followed by copper (II) sulphate • The appearance of deep purple colour indicates the presence of proteins

  16. DCPIP test • Add the extract into a constant amount of DCPIP solution • Count the number of drops of extract added until the DCPIP solution become decolorized

  17. Measure the thickness of coagulation of the egg custard

  18. Measure the change in volumes

  19. Results of the experiments

  20. Rise In Temperature 100 80 78 80 60 60 Degree Celsius 40 11 20 0 Electric Microwave Solar Cooker Town Gas Cooker Oven Cooker Temperature rise of egg custard BEST Unit : ºC

  21. Electric Cooker Microwave Oven Gas Cooker

  22. COAGULATED 2 cm NO COAGULATED OVERCOOKED

  23. microwave oven Distilled water electric cooker solar cooker town gas DEEP PURPLE DEEP PURPLE DEEP PURPLE LIGHT PURPLE Food sample: Custard

  24. Nutrients retained (proteins) HIGH HIGH HIGH LOW LIGHT PURPLE

  25. Percentage Of Vitamin C In Food Sample Retained 90 80.53 80 61.2 70 60 49.04 50 38.9 40 Percentage (%) of Vitamin C 30 20 10 0 Electric Cooker Microwave Oven Solar Cooker Town Gas Types of Cooker Vitamin C retained tomato paste Food samples: liquidized tomato paste Unit : %

  26. Price of the cooker 2500 2000 2000 1500 1500 Price / Dollars ($) 1000 400 500 50 0 Electric Microwave Solar Cooker Town Gas Cooker Oven Cooker (approximately) Amount of money for buying the cooker MOST EXPENSIVE CHEAPEST Unit : $

  27. Conclusion and Implications

  28. Factors to be considered • Nutrients retained • Cooking efficiency • Economical Price

  29. Which one is the most preferable? For nutrients retained: SOLAR COOKER !!!! For the highest cooking efficiency: ELECTRIC COOKER !!!! For the most economical one: FLAMELESS COOKING !!!!

  30. Conclusion

  31. CONCLUSION Gas cooking is NOT better than FLAMELESS COOKING

  32. Why may FLAMELESS COOKING take the place of GAS COOKING? • Energy crisis • Price of fossil fuels  • Gas cooking becomes not so economical • Flameless cooking is being improved and promoted

  33. Is solar cooker really practical or applicable? 96ºC • Sunlight in Hong Kong is regional • In other countries with strong sunlight, a temperature as high as 96ºC has been recorded • Technology of solar cooker can be further developed in the future

  34. Exploration of 21st century flameless cooking 廿一世紀之無火煮食研究

  35. 1. Solar Cooker Country Report http://solarcooking.org/docs.htm#country_reports 2. U.S. Department of Energy Efficiency and Renewable Energy http://www.eere.energy.gov/consumerinfo/factsheets/db5.html 3. Solar Cookers International http://solarcooking.org/newsletters/scrapr00.htm 4. Palmer Development Group http://www.ctech.ac.za/conf/due/SOURCE/Web/Sejake/Sejake.html 5. DSM http://www.dsm.com/en_US/html/about/about_us_home.htm Data resources for solar cooker BACK