① When the temperature changes to △ t through a certain process, it absorbs (or emits) heat. Q stands for heat (J)

Q=c·m·Δt．

Q suction=c · m · (t-t0)

Q release=c · m · (t0-t)

(t0 is the initial temperature; t is the final temperature)

Where C is the specific heat (capacity) associated with this process

The unit of heat is the same as that of work and energy. The unit of heat in the International System of Units is Joule (Joule for short, J for short) (established in memory of the scientist Joule). Historically, the unit of heat was defined as calorie (cal for short), which was only used as an auxiliary unit of energy, 1 calorie=4.184 joules.

Note: 1 kilocalorie=1000 calories=1000 calories=4184 joules=4.184 kilojoules

The equilibrium relationship between the heat absorbed by an area and the heat released and stored within a certain period of time.

△T=（t1-t0）

② Calculation formula of heat released by complete combustion of solid fuel: Q=mq Calculation formula of heat released by complete combustion of gaseous fuel: Q=Vq Q represents heat (J), q represents calorific value (J/kg), m represents mass of solid fuel (kg), and V represents volume of gaseous fuel (m ^ 3).

Q=Q discharge/m (solid); Q=Q discharge/v (gas)

W=Q discharge=qm=Q discharge/m W=Q discharge=qV=Q discharge/v (W: total work)

(Heating value is related to pressure)

SI SI units:

Q -- Heat released after complete combustion of a certain fuel -- Joule J

M -- represents the mass of a certain fuel -- kilogram kg

Q represents the calorific value of a fuel J/kg

Thermal energy calculation formula

Q=△t*m*C

(The specific heat capacity is C, the mass is m, and Δ t is the temperature difference)