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Mechanical Study · .- B.AKER I WOHl ARCHITECTS · ~32 Lincoln Street Be,ston, MA 02111 T: 617 . ·350 . 7420 · www.baker-wohl.am MECHANICAL STUDY · ! I ' I I Prepared For . I I iI I WESTERN MASSACHUSETTS. H.o ·SPITAt. 91 .East Mountain Road Westfield, MA 01085 Prepared By · Wozny/Barbar & Associates, Inc. 1.0.90. Washington S~reet Hanover, MA 02339 '. And A M Fogarty ·& Associates, Inc. 17;5 Derby Street- Suite 5 . Hingham, MA 020.43 ! • Preface This study includes an engineering review of the existing mechanical heating, ventilating, and air­ conditioning systems serving five buildings located on the Western Massachusetts Hospital campus. At least, two HVAC options for each building are presented, keeping in mind the future potential uses of the buildings as expressed by the Massachusetts Department ofPublic Health. Executive Summary. Wozny Barbar and Associates (WB&A), partnered with Baker/WohlArchitects (BWA), have been tasked with evaluating the mechanical systems of five buildings located on the Western Massachusetts Hospital campus located at 91 East Mountain Road in Westfield, Massachusetts. The Main Hospital is a 93,000 square foot, three-story building with basement, circa 1910 that serves as a chronic care facility, with the goal to convert back to a medical facility. The unoccupied Quarry Hill dormitory consists of two-stories with basement and may be converted to a Veterans Administration dormitory with treatment, recovery, and outreach program support. The Clark building is two-stories supporting administrative services for the hospital. The Garage is an open floor plan pre-engineered metal building installed on a slab, providing maintenance for campus machinery. Finally, the Storeroom is a two-story warehouse providing storage and , shipping support. For all five buildings, the existing heating equipment consists of gas and/or f:/2 oil-fired boilers serving cast-iron radiators, unit ventilators, and unit heaters and is in average condition. This study describes the existing conditions of the mechanical systems serving each building in more detail below. Two options were considered for each building and the recommended option is discussed in detail further in this report. Project Justification Based on the existing equipment age, condition, code shortfalls, and a desire to upgrade the campus services offered, a study to establish a concept and baseline for equipment replacement is warranted. The systems are difficult to work on in making repairs due to the complexity and age of the distribution system, given all the temporary repairs and additiOn$ that have OCC1:11Ted over the years. Problem Statement The existing mechanical equipment has had the minimal necessary repairs and additio~ over a number of years, with little or no documentation, maKing· further repairs dif~cult and, in some cases unsafe for the staff. Existing Conditipns Based on field observations, review of existing documents and discussions with building management staff, WB&A provides descriptions of the existing mechanical services for the five buildings included as pait of this report. Main Hospital: Heating is provided for the building by one of two dual-fuel Cleaver Brooks packaged boilers, I . • located in the basement, installed in April, 1988, with input capacity of6,277,000 Btu per hour. The boilers, fired by either natural gas or #2 fuel-oil, produce low-pressure steam.(8-pounds) that is connected to distribution piping serving cast-iron radiators and baseboard located throughout the facility. Condensate returns to a duplex condensate receiver tank where it is pumped to a 1Joiler feed tank for delivery back to the boilers to repeat the process. Each steam heating radiator and baseboard device is controlled by a thermostatic radiator valve. Three Hurst boilers, installed in 2002, with input capacity of 420,000 Btu per hour, fired by either natural gas or #2 fuel-oil, produce medium-pressure steam (45-pounds) that is connected to distribution piping serving the kitchen and laundry. Condensate returns to a duplex condensate receiver tank where it is pumped to a boiler feed tank fot: delivery back to the :boilers to repeat the process. Mechanical ventilation of toilet areas is provided by exhaust duct risers up to roof-mounted exhaust fans. Operable windows provide ventilation for the bedrooms. Numerous packaged terminal air conditioners, located above the windows, provide cooling for selected bedrooms and office spaces. Several split-system air conditioning units, with roof­ mounted condensing un~ts, provide cooling for selected internal spaces. A 20,000-gallon single-wall underground storage tallk.supplies #2 fuel-oil to the Cleaver Brooks heating boilers. The Hurst boilers are fed from the 3,000-gallon undergroUnd storage tank used to operate the Emergency Power Generators. Main Hospital Cleaver Brooks Boilers Hurst Boilers Typical Steam Radiator with Typical bedroom with PTAC Roof Exhaust Fans and Thermostatic Radiator Valve and operable window Condensing Units Quarry Hill Dormitory: Heating is provided for the building by an HB Smith packaged steam boiler installed in 1987, installed in the basement, with input capacity of 1,125,000 Btu per hour. The gas-fired boiler produces low-pressure steam that is connected to distribution piping serving cast-iron radiators and baseboard located throughout the building. Condensate returns to a duplex condensate receiver tank where it is pumped back to the boiler to repeat the process. Each steam heating radiator and baseboard device is controlled by a thermostatic radiator valve. -- ·-::---~:.--::::-::::-----~---- -... Quarry Hill Dormitory HB Smith Boiler Condensate Receiver Tank Clark Building: Heating is provided for the building by an RBI hydronic boiler installed in 2001, located in the basement, with an input capacity of 1,000,000 Btu per hour. The gas-fired boiler produces hot water that is circulated by base-mounted pumps through distribution piping, delivered to unit ventilators and cabinet unit heaters located throughoutthe building. Ventilation is achieved through exterior wall louvers connected to the back of the unit ventilators. Roof-mounted exhaust fans provide ventilation o~toilet areas. Some packaged terminal a~r conditioners, located above windows, provide cooling for selected areas. A couple split-system air conditioning units, with grade-mounted condensing units, provide cooling for selected internal spaces. Clark Building RBI Boiler Base-mounted Pumps Garage: The main Garage floor area is heated by five gas-fired, <;:eiling suspended Modine unit heaters. The office space and toilet room are heated by electric baseboard. The toilet room is ventilated by a ceiling-mounted exhaust fan, terminating its exhaust within the building. No general ventilation system we obse1;ved for the open garage area. Garage Building Modine Unit Heater Garage Floor Plan Store Building: Heating is provided for the building by an HB Smith packaged steam boiler installed in 1992, installed in the basement, with input capacity of787,000 Btu per hour. The gas-fired boiler produces low-pressure steam that is connected to distribution piping serving unit heaters located throughout the building. Condensate returns to a duplex condensate receiver tank where it is pumped back to the boiler to repeat the process. Sidewall propeller fans provide general ventilation for the main floor area. Store 'Building Condensate Receiver Tank HB Smith Boiler Options Main Hospital: Option 1 : The existing steam building heating system, including Cleaver Brooks boilers, · associated condensate receivers, boiler feed tanks, breeching, fuel-oil pumps, underground fuel-oil storage tank, steam distribution piping, radiators, condensate return piping, steam traps, and all associated appurtenances would be removed in their entirety. A four-pipe system would be designed to provide simultaneous heating and cooling for the entire building. Bigh-efficiency gas­ fired condensing boilers and base-mounted variable-speed pumps located in the basement mechanical room would circulate the heating water to fan coil units located throughout the facility. A roof-mounted air-cooled chiller would be piped to the basement mechanical room where base­ mounted variable-speed pumps would circulate the chilled water to the same fan coil units located throughout the facility. A plate-and-frame heat exchanger, located in the basement mechanical room, would provide isolation between the chiller and the chilled water distribution loop so as to segregate the glycol solution to the chiller side of the system for freeze protection. Both the heating distribution system loop and the cooling distribution system loop would be provided with an air separator, expansion. tank, and chemical feed. The chilleq water loop would be provided with automatic glycol fill. Each vertical floor-mounted fan coil unit would consist 9f a filter, hot water coil, chilled water coil, blower fan, and controls. Miscellaneous heating devices would be utilized to heat entrances, staircases, mechanical spaces, etc. ·Packaged roof-mounted energy recovery ventilators, with heating and cooling capability, would provide code-required ventilation to the corridors. Exha~st from the toilet rooms would be connected to the energy recovery ventilators. The Hurst boilers would remain for service to the kitchen and laundry. It is assumed that the acoustical asbestos ceiling at the corridors will need to be abated. Option 2: The existing steam building heating system, including Cleaver Brooks boilers, associated condensate
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