How Long Does It Take To Boil A Pot of Water?

After selling Lestov induction cooktops for many years, a problem is coming: how many steps does it take to boil a pot of water?

 

Yes, it is so easy, only 3 steps: Fill the pot with water; Open the switch of induction cooker; Boil the water.

 

Ok, we are not kidding. Instead, we are generalizing the knowledge of Lestov induction cooker, so how long does it take to boil a pot of water?

 

Take the model QX-Y800 automatic commercial induction soup cooker as an example.

 

The bucket is filled with 230 liters of water. Heat water at room temperature to 100°C.

●In China, the normal temperature of the project is calculated at 20°C. There is no national standard. It needs to be judged according to different seasons in different regions. For example, the normal temperature of Russian engineering is 10°C. In the boiler design calculation book, the normal temperature is 20 °C. 

●The specific heat capacity of water is: 1 kCal = 4.2kJ / (kg•°C) (physical unit, that is: the heat required to increase 1°C per liter of water is about: 4.2kJ / 4.186 ≈ 1kCal.

●Electric energy output per KW per hour is about 860 kCal: 1kW•h=1000W×3600s=3600kJ=860kCal

 

--From the above basic data, to heat 230 liters of water from room temperature to 100 °C, it needs 18400kCal (230L×(100°C - 20°C)×1kCal =18400kCal)

--Assuming the QX-Y800 is running at full capacity, the hourly heat production is: 25kW×860kCal=21500kCal 

To boil 230L water, it needs about 51 minutes: 18400÷21500) × 60 minutes = 51 minutes

About the calculation of the rice-steaming time for commercial foood steamer , there is a set of data here.

●The bulk density of rice is 0.75 kg/L, and the specific heat capacity of rice is about 0.45 kCal (c=1.87kJ/(kg•°C)≈0.45 kCal)

●The ratio of water to rice is 1.2 : 1.

 

Suppose that a conventional steamed rice pan is filled with 75% of rice ( Rice pan size: 600mm*400mm*50mm). The heating power required for each layer is 1kw,

 

How long does it take to steam the rice without calculating the heat loss? The calculation data is as follows:

--The mass of rice: (6×4×0.5) L×1×0.75≈9 kg;

--Heat required for rice: 9kg× (100°C - 20°C) × 0.45kCal = 324 kCal;

--Water quality: (6×4×0.5) L×1.2×1≈14.4 kg;

--Heat required for water: 14.4kg×(100°C - 20°C)×1kCal = 1152 kCal;

--The steaming time is about 103 minutes:

1152kCal+324kCal)÷(1kW×860kCal)×60 minutes≈103 minutes.

 

Calculation is a headache for me. It doesn't matter. There is a simplified version here:

--How to calculate the heating time?

Heating time (minutes) = 5.5*capacity (liters) / power (kw)

--How to calculate heating power?

Heating power (kw) = 5.5*capacity (liter) / heating time (minutes)

 

Have you fallen in love with Lestov induction cooktop? Welcome your sample order.

Related reading：

Why Can Induction Cooking Save Energy?

Advantages of Commercial Induction Stoves

Buy Commercial Fryers: How To Choose The Sizes?