The system "environment (water in an annular volume) - a thin cylindrical metal wall - the investigated liquid medium" is being studied. Heat exchange during heating and cooling of water-diluted chicken litter under conditions of forced convection is studied. Chicken droppings represent a multiphase medium, as it consists of solid particles based on a liquid medium.

After conducting an analysis of the distribution of excess temperature over time Lnϑ=f(τ) during the study of heat exchange of chicken litter under the conditions of its cooling and heating, a linear rate of cooling (heating) m=const was determined, which is characteristic of a regular thermal regime during cooling (heating) of a solid body ( system of solid bodies) and maintaining the stability of the ambient temperature.