① Through a process with temperature change Δt, the heat absorbed (or released). Q represents heat (J)
Q = c · m · Δt.
Q_absorb = 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 related to this process.
The unit of heat is the same as work and energy units. In the International System of Units (SI), the unit of heat is Joule (abbreviation: J) (established in honor of scientist Joule).
Historically, the unit of heat was defined as Calorie (abbreviation: Cal), used as an auxiliary unit of energy, where 1 Cal = 4.184 J.
Note: 1 kcal = 1000 cal = 1000 calories = 4184 J = 4.184 kJ
The equilibrium relationship maintained by the heat absorbed and released by a region during a certain period.
ΔT = (t1 - t0)
② Calculation formula for heat released by complete combustion of solid fuel: Q_release = m·q Calculation formula for heat released by complete combustion of gaseous fuel: Q = V·q Q represents heat (J), q represents heat value (J/kg), m represents mass of solid fuel (kg), V represents volume of gaseous fuel (m³).
q = Q_release / m (solid); q = Q_release / V (gas)
W = Q_release = q·m = Q_release / m W = Q_release = q·V = Q_release / V (Total Work)
(Heat value is related to pressure)
SI International Units:
Q —— Heat released after complete combustion of a certain fuel —— Joules J
m —— Mass of a certain fuel —— Kilograms kg
q —— Heat value of a certain fuel —— Joules per kilogram J/kg
Thermal Energy Calculation Formula
Q = Δt * m * C
(Specific heat capacity is C, mass is m, Δt is temperature difference)
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