# Wood heat capacity¶

chemics.wood_heat_capacity.cp_wood(x, tk)[source]

Heat capacity of wood based on moisture content and temperature

$c_{p,x} = \left(c_{p0} + c_{pw} \frac{x}{100}\right) / \left(1 + \frac{x}{100}\right) + A_c$

where $$c_{p,x}$$ is heat capacity of wet wood [kJ/(kg K)], $$c_{p0}$$ is heat capacity of dry wood [kJ/(kg K)], $$c_{pw}$$ is heat capacity of water as 4.18 kJ/(kg K), $$x$$ is moisture content [%], and $$Ac$$ is an adjustment factor that accounts for the additional energy in the wood–water bond 1.

The $$c_{p0}$$ term is determined from

$c_{p0} = 0.1031 + 0.003867\,T$

where $$T$$ is temperature [K]. The $$A_c$$ term is calculated from

$A_c = x (b_1 + b_2 T + b_3 x)$

with $$b_1 = -0.06191$$, $$b_2 = 2.36e\times10^{-4}$$, and $$b_3 = -1.33\times10^{-4}$$.

Parameters
• x (float) – Moisture content [%]

• tk (float) – Temperature [K]

Returns

cp (float) – Heat capacity of wood [kJ/(kg K)]

Example

>>> cp_wood(12, 340)
1.91


References

1

Samuel V. Glass and Samuel L. Zelinka. Moisture Relations and Physical Properties of Wood. Ch. 4 in Wood Handbook, pp. 1-19, 2010.