RESIDENCE INN BETHESDA DOWNTOWN
7335 Wisconsin Avenue ·
Bethesda, Maryland 20814 USA

MECHANICAL UPGRADES - Water Source Heat Pumps.

All public space water source heat pumps were replaced in this project.  Ventilation rates were increased in certain areas in order to introduce more outside air into the public spaces to counter possible negative pressure in the lobby.

The main guest room ventilation unit located in the penthouse mechanical room was upgraded to a custom unit complete with an integrated exhaust system which replaced the aging traditional exhaust fans on the roof.

The unit was equipped with an enthalpy wheel.  Rather than discard conditioned building air, an enthalpy wheel recovers useful energy and transfers it to incoming, fresh air. This saves energy by reducing the need for cooling in the summer and heating in the winter.  The integrated unit also serves as the guest room toilet exhaust system, which allows removal of the previously employed central toilet exhaust fans.  The existing supply distribution network was re-used as well as the all of the exhaust ductwork.

This project successfully  increased the ventilation rates in the building while  saving energy by recapturing energy normally wasted by the large quantities of exhaust air.  Since hotels operate the building exhaust systems 24 hours a day, 365 days a year, the implementation of an energy recovery device saves substantial energy which reduces operating cost.

For the owner's of the hotel, this reduction of energy consumption and hence energy costs results in increased return on investment.

ENERGY CONSERVATION = R.O.I. Maximization.^TM