Tag Archives: champignons

769-779 L. Brazdeikis
Thermal properties and temperature regime of champignon cultivation substrate
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Thermal properties and temperature regime of champignon cultivation substrate

L. Brazdeikis

Institute of Agricultural Engineering Lithuanian University of Agriculture, Raudondvaris, LT-54132 Kaunas reg., Lithuania;
e-mail: autlab@mei.lt

Abstract:

In designing and analysing the systems of automatic regulation of substrate
temperature for champignon cultivation it is necessary to know substrate thermal properties
(thermal conductivity and specific heat), intensity of substrate self-heating and the distribution
of overtemperature caused by self-heating within a substrate briquette. It is proposed to estimate
substrate thermal properties by the nonsteady method of combined determination of thermal
characteristics using a flat constant power heat source. The scheme of experiments,
mathematical expressions for calculating thermal indicators, examples of temperature variation,
examples of thermal indicators calculations and the established mean thermal indicators for
champignon cultivation substrate are presented.
An electrical analogy model of thermal process in substrate briquette was made for selfheating
investigations. It was established by modelling that the distribution of overtemperature
caused by self-heating within the thickness of a briquette is parabolic. The mean specific heat of
substrate self-heating was established by comparison of modelling and experiments results. An
equation to assess the overtemperature of substrate briquette centre in engineering calculations
is presented. 

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