Thermodynamics

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Thermal Conductivity

 , where:

k = Thermal Conductivity (W/(m*K))

Q = Heat Energy Transferred (J)

t = Time during which Q is transferred (s)

x = Distance from location of heat transfer (m)

A = Cross-sectional area (m2)

T = Change in temperature at point x distance away (K)

Thermal Efficiency

, where:

 = Thermal efficiency (%)

Wout = Mechanical/Work energy extracted (J)

Qin = Heat input (J)

Thermal Effusivity

 , where:

e = Thermal Effusivity (J/(K*s.5*m2))

k = Thermal Conductivity (W/(m*K))

 = Density (kg/m3)

cp = Specific Heat Capacity (J/(kg*K))

Thermal Inertia

 , where:

I = Thermal Inertia (J/(m2*K*s1/2)

k = Thermal Conductivity (W/(m*K))

 = Density (kg/m3)

c = Specific Heat Capacity (J/(kg*K))

Universal (Ideal) Gas Constant

The universal gas constant, is given by the constant number for dry air conditions:

 ,  where:

In imperial units (english units), this equals 6.13 (ft*lb)/(K*mol)

R = Universal Gas Constant (J/(K*mol)) for dry air conditions

NA = Avogadro Constant (1/mol)

kB = Boltzmann Constant (J/K)

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