Question

К зиме заготовили 3м в кубе березовх дров и 2т каменного угля. Какое количество тепоты выделилось в печи при полном сгарании заготовленного топлива? Полностью все с обьяснениями если можно)

Answer 1

Итак... Формула у нас такая вот есть Q=qm (Кол-во теплоты = удельная теплота сгорания умножить на массу)

 

Q=Q1+Q2, ибо сгорают дрова дают тепло+сгорает уголь дает тепло

Q1=q1m1 (березовые дрова)

m1=p1V1

m1=650*3=1950 кг

Q1=10000000*1950=1950*10 в 7 степени Дж

Q2=q2m2

Q2=2000*27000000=5400*10в 7 степени Дж

Q=1950*10 в 7 степени+5400*10 в 7 степени=7350*10 в 7 степени Дж
 

Answer 2

Calculation of Heat Generated

To calculate the amount of heat generated by the combustion of the provided fuel, we need to know the calorific values of birch wood and coal. The calorific value is the amount of heat energy released per unit mass of fuel during complete combustion.

According to the given information, we have 3 cubic meters of birch wood and 2 metric tons (2000 kg) of coal.

Calorific Value of Birch Wood

The calorific value of birch wood can vary depending on factors such as moisture content and wood density. On average, the calorific value of birch wood is around 18-20 megajoules per kilogram (MJ/kg).

Calorific Value of Coal

The calorific value of coal can also vary depending on the type of coal. However, on average, the calorific value of coal ranges from 20-30 megajoules per kilogram (MJ/kg).

Calculation

To calculate the total amount of heat generated, we need to convert the given quantities into kilograms.

1 cubic meter of birch wood weighs approximately 600-700 kilograms For simplicity, let's assume it weighs 650 kilograms.

Therefore, the total weight of birch wood is 3 cubic meters * 650 kilograms = 1950 kilograms.

The total weight of coal is given as 2 metric tons (2000 kilograms).

Now, we can calculate the total heat generated by multiplying the weight of each fuel by its respective calorific value and summing the results.

Total heat generated = (1950 kg * 18 MJ/kg) + (2000 kg * 25 MJ/kg)

Calculating this, we get:

Total heat generated = 35100 MJ + 50000 MJ = 85100 MJ

Therefore, the total amount of heat generated by the complete combustion of the provided fuel is 85,100 megajoules (MJ).

Please note that this calculation assumes complete combustion and does not take into account any heat losses or inefficiencies in the heating system.

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