Temperature Control

Temperature control ( Is control of your process temperature important ? )

Many  types  of  steam  plant need to be fitted with some form  of  temperature  control.  In any process, product quality is often dependent upon accurate temperature which depends on it's proper control. From  an energy  saving  point  of  view, the ideal temperature is obviously the lowest, which can be accepted for any given application.

In order to lower the temperature of the contents of the tank, the rate at which heat transfer takes place from the coil must be reduced. The simplest  way of  doing this  is  to  reduce  the  temperature  of  the steam in the coil. Clearly, this will lower the difference in temperature between the steam and the product being heated and reduce the  rate  of  heat  transfer, as  desired. We  know  from   the steam  tables that any reduction in the pressure of saturated   steam is  accompanied  by a drop in temperature. For this reason, a  suitable   means of  controlling steam pressure is the  natural solution  to the problem of  controlling the rate of  heat transfer in a coil heated tank.

Temperature control can be achieved by manually throttling the steam valve and manipulating steam flow, in the same way that  a  gas tap is used to  regulate  the  supply of  heat on a domestic  cooker. Unfortunately,  such  an arrangement may call for frequent manual adjustment if the heat requirements of  the  equipment  in question  are liable to  fluctuate  significantly. More accurate  control can be obtained by the installation of a pressure reducing valve but the need  for  manual  adjustment still remains.  The ideal answer is to fit one of the Automatic Self Actuating Temperature Control System .