11. With the appropriate controls, economizers can be used in climates which experience various weather systems. 12. In an HRSG, water passes through an economizer , then a boiler and then a superheater. 13. Economizers were eventually fitted to virtually all stationary steam engines in the decades following Green's invention.14. Economizers are commonly used as part of a heat recovery steam generator in a combined cycle power plant.15. This economizer preheats the steam generator feedwater at the steam generator inlet using the lowest-temperature primary coolant. 16. Economizer circuits are nearly always applied on direct-current contactor coils and on large alternating current contactor coils.17. External stainless steel economizers can be retrofitted to non-condensing boilers to allow them to achieve condensing efficiencies. 18. Some systems include an " economizer mode ", which is sometimes called a " free-cooling mode ". 19. Modern data centers try to use economizer cooling, where they use outside air to keep the data center cool. 20. Finally, there was a small Electric Runabout, the " Economizer , " which was a personnel carrier only.
