Unsteady states of temperatures in surface coolers of air

Authors: K. Filek, B. Nowak, J. Roszkowski

Work of mining surface coolers of air operating indirectly, where cooling medium is cold water, is discussed.

Cases of both co-current and counter-current flow of both media through a cooler are taken into consideration.

Sets of equations describing changeable in time and along a cooler: temperature and specific humidity of cooled air and temperature of heat exchanger and cooling water are presented as well.

Equations describing cooling of air, during which outdropping of water vapour contained in it does not occur and during which this process takes place, are given for each direction of flow of water.

This way four different mathematical descriptions were obtained.

Conducted considerations are illustrated by two calculation examples, whose solutions are presented graphically.