EFFICIENCY OF UTILIZATION OF HEAT IN THE PROCESSES 
OF CONVECTIVE DRYING AND AN EQUILIBRIUM ANALYSIS

M. M. Razin

UDC 664.047(031)

A method for evaluating the efficiency of convective dryers 
from the viewpoint of heat consumption has been proposed; the method 
is based on a comparison of the characteristics of the dryers to a 
standard: the process with an efficiency maximum possible under given 
conditions. The so-called equilibrium analysis assuming the absence 
of the internal heat and moisture gradients in the dried product is 
used. It has been shown that gradient-free processes limiting for 
all modes of phase contact with decrease in the drying intensity to 
zero possess the highest intensity. The basic rules of organization 
of economical drying have been formulated.

Kazan' State Technological University, 68 K. Marx Str., 
Kazan', 420015, Russia; email: michrazi@mail.ru. Translated 
from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 5, pp. 963-970, 
September-October, 2008. Original article submitted May 3, 2007; 
revision submitted January 29, 2008.