How many kJ per min is delivered to water in an avg 3qt stainless steel pot on an avg gas stove on high?

Answer 1

Liquefied Petroleum Gas (LPG) has a calorific value around 94 megajoules per cubic meter. Just for comparison, natural gas varies between 33 and 42 MJ/m3. Stoves with high speed burners are 30% more powerful than standard burners. Rapid burners deliver above 6000 BTU´s, super rapid burners deliver above 10 000 BTU´s, an Iwatani portable stove delivers up to 15 000 BTU´s and a Viking Special 16 000 BTU´s. No matter the efficiency of the combination between your stolve and the quality of the gas available, plus the variables such as distance between the pot and the burner, bottom area of the pot in contact with the flame, airflow etc., you figure out how inaccurate our calculation can be. We maybe wrong by half or by double. Imagine that you have a burner producing 12 322 BTU´s (13 000kJ or 3 611 Watthour ), with the entire flame in contact with the bottom of the pot with a final efficiency (discounting all the losses between the flame and the water inside the pot) of 0.65, you would have 8 450 kJ or 2 347 Watthour being delivered to the water. Again, given all the variables, this can be very inaccurate. Remark: 1 Joule is 1 Wattsecond, 3600 J is 1 Watthour or 60 Wattminute.