The Glady Spellman building is a part of the University of Maryland Prince George’s Hospital Center. The building consists of three floors and is approximately 45,000 square feet in area. The upper two floors were being converted into medical office building and parts of the first floor affected by the renovations of the upper floors were included in the scope of work.

• Our scope of  work included design, permitting, bidding and construction phase services for mechanical and electrical systems serving the renovated areas of the  building and other areas affected by renovation work.

• The mechanical design task was challenging due to the fact that a dual duct system with  the air handling unit located in the penthouse mechanical room served the majority of the building including the first floor which was not included in the renovation of the building. The existing dual duct mechanical      system was studied by taking into consideration the heating and cooling  load of the first and the additional load imposed by the renovation work. It was decided that apart of  the existing ducal duct system could be reutilized for the renovation task      and the renaming areas were served by the two forty tons packaged gas fired variable air volume roof top units. The second and third floor  renovation areas were zoned based on the exposure, use and occupancies of various areas. Each zone was served by a dedicated Variable Air Volume (VAV) box which was equipped with  hydronic heating coil.

• The steam from   campus central heating plant was provided to the first mechanical room  where it tempered the heating water through the shell and tube heat exchangers. The tempered heating water to the heating coils including the reheat hot water coils of the new VAV boxes. The chilled water was also provided      through the campus central chilled water plant to the first floor      mechanical room where it was pumped to the dual duct air handing unit      located in the penthouse mechanical room.

• An existing converter in the first-floor mechanical room provided the required domestic hot water for the building plumbing fixtures which were primarily sinks and lavatories. The hot water temperatures were designed in accordance with Washington Suburban Sanitary Commission (WSSC) requirements for janitor sinks and other plumbing fixtures requiring domestic hot water.