RETA Breeze Sep-Oct 2022

ECONOMIZED SUCTION

History The first successful economizer design was used to increase the steam-raising efficiency of the boilers of stationary steam engines. It was patented by Edward Green in 1845, and since then has been known as Green’s economiser. Modern day boilers, such as those in coal-fired power stations, are still fitted with economizers which are descendants of Green’s original design. In this context

they are often referred to as feedwater heaters and heat the condensate from turbines before it is pumped to the boilers. Years later another use of the term

occurs in industrial refrigeration, specifically vapor-compression

refrigeration. The economizer concept is linked to subcooling as the condensed liquid line temperature is usually higher than that on the evaporator, making it a good place to apply the notion of increasing efficiencies

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