Induction cooker vs. LPG stoves

[danny]

ginutom na tuloy ako
steak and onions hmmmm 

[rdpzycho]

Dahil hindi naman ako makatulog ...

Here's comparison data of Induction Gas vs LPG from Wikipedia I used as basis for computation:
Energy consumption when boiling 2 litres of water (from 20 degrees Celsius)
Induction stove   745 kJ
Gas   1700 kJ

Because of the high efficiency of induction cookers, it takes 43% less energy to boil 2 liters of water. 

Given the following Energy Densities:
Electricity ... 1 kW = 3,600 MJ
LPG ... 11kg x 50.4 per kg = 554.4 MJ

... and using the following fuel prices:
Electricity -    P 8.70 per KWH
LPG      - P 710.00 per 11kg cylinder

Therefore the cost of fuel for boiling 2L of water used above are as follows:
Induction Stove: 0.00180041666667 PHP
LPG : 2.17712842712843 PHP

PS
All of the above is correct, unless it's not. I failed Algebra 101 during my froshie year in Uni ....

PPS
Spreadsheet calcuations:
Cost of Fuel   MJ / Unit of Energy   Consumption (MJ)      Cost of Fuel Consumed
8.7   3600   0.745   0.02%   0.00180042
710   554.4   1.7   0.31%   2.17712843   

sir, 1kWh = 3.6MJ lang not 3600MJ. 1Wh = 3600J since 1 Ws = 1J. 3600J x 1000 = 3.6MJ.

to verify, eto online calculator sir.
http://www.convertunits.com/from/kWh/to/joules

.745MJ / 3.6MJ * (average 8 to 10 PhP / kWh) = 1.60 to 2.00 PhP to boil 2 liter of water.

There might be some stuff not yet included like for example the transfer of heat It takes considerable amount of time to transfer heat. Although I failed many times in chemistry >.<. They never gave questions how long it would take to boil 1 liter of water. They only mentioned how much energy it takes though.

kasama na 'yung consideration ng power at time sa energy sir. since 1J = 1 Nm, 1Ws = 1 Nm/s * s, 1Ws = 1J, 1kWh = 3.6MJ.

kinuha 'yung efficiency ng system using calorimeter at sa table stated din 'yung time. meaning kasama na 'yung transfer of heat from magnet to cookware at open flame to cookware.

[franzschluter]

sir, 1kWh = 3.6MJ lang not 3600MJ. 1Wh = 3600J since 1 Ws = 1J. 3600J x 1000 = 3.6MJ.

to verify, eto online calculator sir.
http://www.convertunits.com/from/kWh/to/joules

.745MJ / 3.6MJ * (average 8 to 10 PhP / kWh) = 1.60 to 2.00 PhP to boil 2 liter of water.

kasama na 'yung consideration ng power at time sa energy sir. since 1J = 1 Nm, 1Ws = 1 Nm/s * s, 1Ws = 1J, 1kWh = 3.6MJ.

kinuha 'yung efficiency ng system using calorimeter at sa table stated din 'yung time. meaning kasama na 'yung transfer of heat from magnet to cookware at open flame to cookware.

Ah I see it na! Haha. Correct. What cookware pala was used? Iron thickness?

[rdpzycho]

^ hindi indicated sir. pero roughly ganun din nakukuha ko sa bahay, around 5 minutes to boil 2L at 2kW setting. wala akong personal comparison sa LPG dahil ayaw sa LPG ng tatay ko.

[marcelino]

nakabili na pala ako nito... kyowa. sa SM. 1400watts lang. 2500pesos... tsaka na ako upgrade. sinubukan ko lang...
ok pala... mabilis nga magpakulo! tamang tama kung umaga at medyo nagmamadali para sa kape...
id say, depende pa din sa pot. mas mabilis kung may base plate ang pot. kung yung simpleng pot na walang base plate, may katagalan din. pinag-experimentuhan ko ang mga lutuan namin dito...

kaso, iba pa din yung lasa ng luto sa open flame. especially kung prito, parang di nakakalabas yung lasa ng pagkain.
pero gusto ko pa din lalo na kapag-indoor. di nakakadagdag sa room temperature.

may isa pa akong energy efficiency na naobserve... since walang apoy, di affected ng hanggin!!!
nung bago pa nga, ang kulit ni misis... patayin daw ang electric fan at baka mamatay ang apoy! everytime nya na makita ako na nagluluto yan ang sinasabi saakin... heheh

but then, depende sa lulutuin, mas masarap ang luto sa apoy.

--just like rice... pinakamasarap na lasa ng rice yung luto sa apoy gamit ay kahoy. probinsyano nga ako!!!

[rdpzycho]

^ merong atang mga techniques sis pagdating sa induction. 'yung ibang chef gumagamit ng both induction at open flame.

mas masarap ang kanin lalo na kapag sa palayok linuto.

[franzschluter]

Totoo un iba ung lasa ng flame sa non flame. Although we do not eat rice sa bahay. For example ung potatoe and sweet potatoe hinahagis lang namin sa uling. Afterwards it is peeled prior to prep sa dish. Super sarap because it has this smoke grilled smell on it.

But sa pagluto ng rice though. I think it has something to do with temperature ng rice cooker or rice pot rather than ung smell ng LPG flame. Kase medyo malabo sa rice since enclosed sya tuwing nakikita ko na meron nag sasaing. But then again I can be wrong as I am no expert in cooking rice.

Sa steak sigurado naman ako dependent sya sa cookware. It is a definite must to cook steak such as ribeyes on cast iron. Cooking on other cookware iba mangyayari sa texture ng meat.
The steps I usually do is.
Step 1. Heat the cast iron cookware to maximum setting or full power.
Step 2. Apply cooking oil such as olive if possible. Other oils work as well but olive is the best choice.
Step 3. When it starts to smoke a bit then you are ready.
Step 4. Throw in a 3/4 inch ribeye with your spice rub. A thick steak is better than a thin steak because it won't fold during frying.
Step 5. Wait a few minutes or till you see some juice coming up on the top side. This means you have to flip it
Step 6. This is the amazing part. The steak lower side is fully brown/black but the inside is still fresh.

It is impossible to do this with other frying pans like ung wok hindi mangyayari ganito. Why? No idea. Sa Cast iron nagana lang. But with inductive cooking the same effect is achieved. Nagflaflame pa nga ung pan minsan due to the flashing point and occurs often when flipping the steak. So may parang sizzling effect and the smoke ng olive oil combines with the ribeye resulting in a steak that smells like off the grill.

This is only by experience. Maybe there are other techniques but doing same approach with other cookware will result differently. Same ingredients.

So the end verdict induction cooking is better. Plus the benefits of safety. You won't need to worry kung nakabukas pa ung tanke before you go to bed.

Only disadvantage is:
1. Hindi ako makasindi ng yosi tuwing nauubusan ako ng lighter fluid.
2. Walang oven.

[iyo karpo]

I got this table from Wikipedia.

http://en.wikipedia.org/wiki/Induction_cooker

Technology   Efficiency   Time required to boil 2 quarts (1.9 litres) of water   Energy consumption when boiling 2 litres of water (from 20 degrees Celsius)

Induction stove   83 to 90%[5]   4 minutes 46 seconds   745 kJ             
Halogen stove   60%                   9 minutes 0 seconds   1120 kJ
Electron Coil or Cast Iron55%           9 minutes 50 seconds   1220 kJ
Gas   40%[6]                           8 minutes 18 seconds   1700 kJ

Based on these value, what at unit I want to know is

Peso to Boil 1.9 Liters of water using LPG
Peso to Boil 1.9 Liters of water Using Induction cooker

I tried to calculate it using this value pero di ko nakuha. Anyone? Kung nakinig sana ako sa teacher at proffesor ko noong nag aaral pa ako....

Anong comparison nya sa convection oven.

Ginagamit ko microwave oven the convection oven. Puro may timer.

[GOwin]

@rdpzycho
Thanks for catching my mistake. So, if the price of LPG drops to PHP 588, then there's no fuel cost advantage for using induction cookers.

As of today, price of LPG is P560.

sir, 1kWh = 3.6MJ lang not 3600MJ. 1Wh = 3600J since 1 Ws = 1J. 3600J x 1000 = 3.6MJ.

to verify, eto online calculator sir.
http://www.convertunits.com/from/kWh/to/joules

.745MJ / 3.6MJ * (average 8 to 10 PhP / kWh) = 1.60 to 2.00 PhP to boil 2 liter of water.

kasama na 'yung consideration ng power at time sa energy sir. since 1J = 1 Nm, 1Ws = 1 Nm/s * s, 1Ws = 1J, 1kWh = 3.6MJ.

kinuha 'yung efficiency ng system using calorimeter at sa table stated din 'yung time. meaning kasama na 'yung transfer of heat from magnet to cookware at open flame to cookware.

[GOwin]

Naalala ko lang na dati akong gumagamit ng camping stove sa "kitchen" ko sa aking dating bachelor's pad. Cost of a 250g butane canister is P70. Butane energy density is 27.7 MJ per liter. Same stove efficiency (probably even lower than LPG).

Cost to boil 2 litres of water: 17.18.

Ang mahal pala! It didn't matter then since I didn't really cook at home. Yung isang canister would last me 4-5 months at a time.