Abstract
Reduction of CO_2 emissions and energy saving are the urgent issues for many fields of industries at present. Steam is used for energy supply media by considerable rate in the whole industry. Accordingly, we executed measurements of steam flow rate at two working factories for factory energy management aimed for energy saving. Heat loss from steam pipes was measured by two methods at a working factory. One is a method to calculate difference between steam flow rate at boiler exit and that at machinery using steam. Another is a method to measure each drain flow rate from drain-trap. Then boiler total efficiency was calculated. At another working factory, small-size heat pumps were installed to a washing process. Steam was also supplied to the process from a boiler when heat demand became large. The steam flow rate was measured to estimate energy saving effect of the heat pumps.
