**Author details**

<sup>ρ</sup> density, kg<sup>m</sup><sup>3</sup>

*Low-temperature Technologies*

the metal, —

bw bound water cr crystallization fr freezing fre end of freezing fsp fiber saturation point

fw free water

Lat latent heat

0 initial

v volume w wood

**Superscripts**

**128**

τ time, s

@ at

**Subscripts**

σ root square mean error (RSME), <sup>o</sup>

gen generalized (for specific heat capacity)

we wood effective (for specific heat capacity)

wS wood with solid state of water (ice) in it

ice ice (for logs' icing degrees)

p parallel to the wood fibers

wL wood with liquid water in it

272.15 at *T* = 272.15 K, i.e., at *t* = 1°C 293.15 at *T* = 293.15 K, i.e., at *t* = 20°C

vM volume of the metal nfw nonfrozen water

r radial direction

wUfsp wood at *u* = *u*fsp wUnfw wood at *u* = *u*nfw

m medium (for cooling substance)

C

Δ*r* step along the coordinates *r* and *z* for solving of the model, m Δτ step along the time coordinate for solving of the model, s Ψ relative icing degree of logs or relative degree of solidification of

avg average (for relative icing degree or for root square mean error) b basic (for wood density, based on dry mass divided to green volume)

total total (for specific energy needed for freezing of the bound water)

Nencho Deliiski\* and Natalia Tumbarkova University of Forestry, Sofia, Bulgaria

\*Address all correspondence to: deliiski@netbg.com

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
