Temperature Control in Industrial Processes

Recently (1967-69) three papers have been published on the on-off control of temperature in industrial processes. They reported results that appeared to conflict, and this subsequently caused confusion in industrial control circles. This paper critically examines these papers and shows that two are complementary while the third is misleading. New results are reported that cover deficiencies in all three papers. The presentation is intended for the professional engineer concerned with the control of industrial plant, rather than the control scientist.