Johns Hopkins Hospital Medical Office Building Statistics
Part 1
General Building Data
Building name – The Medical Office Building at Johns Hopkins Hospital
Location of site – 1700 block of Orleans Street, Baltimore Maryland
Building occupant name – Johns Hopkins Hospital
Occupancy or function types – Medical offices, exam rooms, dental exam rooms, and conference rooms.
Size – 88,260 sq ft
Number of Stories – Three stories above grade, one below grade
Project team –
Architect – ZGF, Zimmer Gunsul Frasca Partnership
http://www.zgf.com/washington.htm
CM – Atlantic Builders
http://www.atlanticbuildersgroup.com/
Mech/Elec – Leach Wallace Associates
http://www.leachwallace.com/home.cfm
Structural – Columbia Engineers
http://www.columbiaengineering.com/ (under construction)
Dates of Construction – June 2005, end of March 2006
Actual cost information – total project cost, 15.5 million
Project delivery method – design-bid-build
Architecture
Architecture
The
MOB has few architectural features of note, aside from it’s entrance
lobby and glass stairwells. The entrance lobby is a three story glass atrium
centered on the eastern elevation of the building.
The
MOB can be broken down into two basic areas, the lower two floors which
serve patients, and the upper two floors, which are mainly offices and support
spaces.
Basement
level features the more specialized spaces, such as exam rooms, dialysis
rooms, radiology rooms, infusion rooms, laser treatment rooms, and phlebotomy
exam rooms. The first floor features exam rooms, a few offices, waiting
rooms and medical supply rooms.
The second and third floors are all offices, conference rooms, staff spaces,
and administrative spaces.
Major National Codes –
International Building Code - 2000 Edition
International Mechanical Code - 2000 Edition
National Fire Protection Association (NFPA)
BOCA National Fire Prevention Code - 1993 Edition
National Electrical Code - 2000 Edition
National Standard Plumbing Code - 2000 Edition
Baltimore City Health Department
State and City Building Codes
Fire Prevention Bureaus of Baltimore City and the State of Maryland.
Baltimore Gas and Electric
Zoning – The MOB is zoned MR for Manufacturing/Restricted.
Other uses in this zone include, warehouses, banks, laboratories, assembly
of pre-manufactured goods, clinics, printing and research institutions.
Building envelope – The MOB is fairly non-descript in terms of it’s envelope, it’s non-load bearing brick supported by a steel frame. The three story glass atrium is centrally located. The two outer stairwells also have glass curtain walls the height of the stairwells. The roof is a flat, EPDM roof with an acoustical fence to muffle noise from the 6 rooftop package units.
Part 2
Primary Engineering Systems
Construction
At this
point, construction is ongoing. Johns Hopkins is in a poor neighborhood,
which is a hindrance to construction, as it necessitates the site being
blocked off with barbed wire and all materials being locked in trailers
overnight. Although the fact that JHU posts an armed guard on every corner
already is a help. The only specific problems they’ve encountered
is an encroaching foundation wall from the neighboring parking garage.
Electrical
All electrical
service to the building is supplied via a single electrical room on the
southern end of the building. The transformer size is 13.2KV 2500KVA Delta
480Y/277V. The Main Switchboard is 480Y/277V rated at 3000A. Most local
service is via 480Y/277 V panel boards. This is only reversed on the third
floor where the 280Y/120 V panelboard is much larger than the 277 service.
This is primarily because the third floor is all offices and administrative
spaces equipped with computers.
Emergency
power is generated in a separate generation facility within the adjacent
parking garage and introduced to the MOB via a conduit in the main southern
electrical room. The emergency distribution panel is rated at 13.2KV 2300KVA
480Y/277V.
Lower Level panelboards – 480Y / 277 V 300A
280Y / 277 V 150A
First Floor panelboards - 480Y / 277 V 225A
280Y / 277 V 150A
Second Floor panelboards - 480Y / 277 V 225A
280Y / 277 V 150A
Third Floor panelboards - 480Y / 277 V 225A
280Y / 277 V 800A
Lighting
Lighting throughout
most spaces in the MOB is 277 V recessed fluorescent down lighting.
This holds true for the hallways and office spaces which are recessed, gridded,
direct/indirect fluorescent down lights. Exam rooms are similar fixtures
except that they are lensed fixtures and the cabinets are equipped with
under cabinet fluorescent strips. The main point of interest in the main
parts of the building are the common spaces with are partially lit by circular
fluorescent down lights.
Stairwells are lit only by fluorescent pendant fixtures at the landings.
Exit lights are green, edge lit aluminum fixtures. These fixtures are hooked
into the 277V system and employ LED lamps.
Bathrooms are lit by a combination of circular fluorescent down lights and
wall washers. The wall washers run the entire length of the wall behind
the stalls and urinals.
Mechanical
The mechanical
system in the MOB is a bit out of place. The MOB uses all electric heating,
for water, and reheat coils. The cooling is accomplished with packaged dx
coil rooftop units. This isn’t too odd, except for the fact that the
MOB is on the same block as the entire Hopkins central chiller and boiler
plant, which is under capacity. This inefficient choice was made to minimize
first cost.
The air handling
units are six rooftop York ECO2 dx units rated at about 735 MBH and 20,000cfm
each. These units use electric reheat. There is also a smaller dx unit and
air cooled condensing unit on a lower roof.
Air distribution
terminals are either VAV with electric reheat coils or fan powered terminal
boxes with electric reheat coils.
Exhaust is routed
directly through the roof to four exhaust fans. There is no isolation exhaust.
Water is heated mostly by a 225 gallon PVI Durawatt electric water heater.
There are also ceiling mounted water heaters of capacity under three gallons
to serve smaller bathroom clusters.
Oxygen is supplied
to the MOB via the central oxygen tanks and pressure regulators. There is
a 9000 gallon main tank and a 3000 gallon secondary tank that supply the
MOB with 55psig oxygen via a 1” supply line. The supply line runs
though a central computerized control panel that’s powered by 120
V one phase power.
Structural
The MOB makes
use of a steel braced frame system. Running East to West in plan view are
wide flanges that support open web joists running N-S, which in turn support
the steel decking and concrete slabs. Columns occurring near the edges of
the foundation are encased in concrete piers. The member sizes are fairly
uniform through the floors with larger members at the two areas on the roof
that the AHUs will occupy.
Additional Engineering and Engineering Support Systems
Fire protection – The sprinkler system for the MOB has not yet been
laid out on interior fit out work. All of the sprinklers will be supplied
from a 6” riser in the western stairwell. All exhaust air risers,
return air risers, and supply air risers are equipped with gravity driven
fire/smoke dampers just before the ductwork joins the risers.
Elevator shafts will be equipped with
fire/smoke detectors that; upon detecting either, will recall the elevator
and sound an alarm.
Transportation – The building transportation is served by three stairwells and a bank of two elevators. The stairwells are equally spaced along the buildings front edge and the elevators are centrally located.
Telecommunications – All telecom is served through the electrical
room.