The Roosevelt Hotel Energy Upgrade
Enwave-Seattle kicked off the project by providing an underground connecting steam line to The Roosevelt Hotel. UMC routed the line into the mechanical space and continued the energy upgrades inside the mechanical room. By eliminating the existing electric domestic hot water heaters, the entire mechanical room was redesigned and upgraded.
The Roosevelt Hotel’s existing electric water heaters were divided into the high and low-rise sections of the hotel with three heaters serving each. Each set of electric water heaters were independent of each other and were very inefficient. UMC connected both systems and provided new domestic hot water booster pumps to serve the high-rise portion.
An Energy Transfer Station component, designed and installed by UMC, contains two doubled walled shell and tube heat exchangers, a brazed plate heat exchanger, and additional equipment to cool the steam condensate. The condensate is looped through the brazed plate and preheated the incoming domestic cold water, and also pumped out of the 500-gallon storage tank for other uses (e.g. laundry). The system averages 94% efficiency.*
*Steam energy in from Enwave-Seattle to lost energy of condensate down the drain.