exploration of 21st century flameless cooking bph70 y.w.c.a. hioe tjo yoeng college
TRANSCRIPT
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Exploration of 21st century flameless
cooking
BPh70
Y.W.C.A. HIOE TJO YOENG COLLEGE
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Exploration of 21st Exploration of 21st century flameless cookingcentury flameless cooking
廿一世紀之無火煮食研究廿一世紀之無火煮食研究
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Flow1. Background2. Design of the Project3. Procedure4. Result5. Conclusion / Implication
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What is gas
cooking? Flameless cooking?
Gas cooking means cooking that with
flames !
Flameless cooking means cooking that
without flames!
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In the past…In the past…We used fossil fuels in an unrestrained way……
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In the present…In the present…
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In the future…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
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The Percentage of Cooking Method that PeopleUsually Use
Town gas80%
Microwaveoven4%
LPG gas16%
Survey conducted by Y.W.C.A. Hioe Tjo Yoeng College
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Design of our projectDesign of our project
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Procedures of Procedures of ExperimentsExperiments
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Preparations of food samplesPreparations of food samples
Egg custard
vitamin C solution
Liquidized tomato paste
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Food Samples cooked by:
Electric cooker Microwave oven Solar cooker Town gas cooker
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All the food samples ( egg custards, All the food samples ( egg custards, vitamin C dissolved solutions and vitamin C dissolved solutions and liquidized tomato paste) were cooked liquidized tomato paste) were cooked
by a by a CONSTANTCONSTANT amount of amount of energy, which is 211.2kJenergy, which is 211.2kJ
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Take the initial and final temperatures of the cooked food
samples
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Biuret testBiuret test Add sodium hydroxiAdd sodium hydroxi
de solution followed de solution followed by copper (II) sulphatby copper (II) sulphate e
The appearance of dThe appearance of deep purple colour ineep purple colour indicates the presence dicates the presence of proteinsof proteins
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DCPIP testDCPIP test
Add the extract into Add the extract into a constant amount oa constant amount of DCPIP solution f DCPIP solution
Count the number of Count the number of drops of extract adddrops of extract added until the DCPIP soed until the DCPIP solution become decollution become decolorizedorized
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Measure the thickness of coagulation of the egg custard
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Measure the change in volumes
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Results of the Results of the experimentsexperiments
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Temperature rise of egg Temperature rise of egg custardcustard
Rise In Temperature
60
80
11
78
0
20
40
60
80
100
ElectricCooker
MicrowaveOven
Solar Cooker Town Gas
Cooker
Deg
ree C
els
ius
Unit : ºC
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Cooking methodsCooking methods Condition of coagulationCondition of coagulation
Electric cookerElectric cooker The whole custard has The whole custard has
coagulatedcoagulated Microwave ovenMicrowave oven Coagulated part is Coagulated part is 2 cm2 cm
thickthick
Solar cookerSolar cooker NoNo custard has coagulated custard has coagulated
Town gas cookerTown gas cooker The whole custard has The whole custard has
coagulatedcoagulated and and
overcookedovercooked
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microwave oven
electric cooker Distilled water
solar cooker
town gas Food sample: Custard
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Nutrients retained (proteins)Nutrients retained (proteins)
Cooking Cooking methodsmethods
Results of Biuret Results of Biuret testtest
Relative Relative amount of amount of proteins proteins retainedretained
Electric cooker Electric cooker Deep purpleDeep purple HighHigh
Microwave Microwave oven oven
Deep purpleDeep purple HighHigh
Solar cooker Solar cooker Deep purpleDeep purple HighHigh
Town gas Town gas cookercooker
Lighter Lighter purplepurple
LowLow
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Percentage Of Vitamin C In Food Sample Retained
49.0438.9
80.53
61.2
0102030405060708090
Electric Cooker Microwave Oven
Solar Cooker Town Gas
Types of Cooker
Perc
en
tag
e (
%)
of
Vit
am
in C
Vitamin C retainedVitamin C retained
Food samples: liquidized tomato pasteUnit : %
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Amount of money for buying Amount of money for buying the cookerthe cooker
Unit : $
Price of the cooker
400
1500
50
2000
0500
10001500
20002500
ElectricCooker
MicrowaveOven
Solar Cooker Town Gas
Cooker
Pri
ce /
Dolla
rs (
$)
(approximately)
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Conclusion and Conclusion and ImplicationsImplications
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Factors to be consideredFactors to be considered
Nutrients retained
Cooking efficiency
Economical Price
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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 !!!!
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ConclusionConclusion RankRankNameName Tem
peratureTem
perature
changechange
CoagulationCoagulation
Nutrie
nts re
tain
ed
Nutrie
nts re
tain
ed
(pro
tein
s)(p
rote
ins)
Nutrie
nts re
tain
ed (v
itam
in
Nutrie
nts re
tain
ed (v
itam
in
C)
C)
Cost
Cost
Electric Electric cookercooker
Microwave Microwave ovenoven
Solar cookerSolar cooker
Town gas Town gas cookercooker
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Gas cooking is NOT better than
CONCLUSION
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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
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Is solar cooker really practical or
applicable?
Sunlight in Hong Kong is regional
In other countries with strong sunlight, a temperature as high as
96ºC
96ºC has been recorded Technology of solar cooker can be furt
her developed in the future
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Exploration of 21st Exploration of 21st century flameless cookingcentury flameless cooking
廿一世紀之無火煮食研究廿一世紀之無火煮食研究
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Data resources for solar cookerData resources for solar cooker1. Solar Cooker Country Report
http://solarcooking.org/docs.htm#country_reports
2. U.S. Department of Energy Efficiency and Renewable Energyhttp://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
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