MECHANICAL

Existing Building Systems
The following are excerpts from the ESD report, dated April 25, 2002:

• Building 470, Gymnasium & Related Facilities (23,118 SF): Cooling and heating is provided by a 2-pipe changeover system, which consists of an 80 ton water cooled chiller, cooling tower and associated pumps; and a water heating system (boiler and a storage tank, with a shell and tube heat exchanger) which services both space heating and domestic water heating needs. The system utilizes the same piping to supply either chilled water or hot water to the respective air handling units, depending upon the environmental zone temperature requirements. It was reported that the system changeover, at times, occurred on a daily basis.
  
  Separate through-the-wall air-cooled Dx packaged units provide the cooling to the racquetball courts. The ESD report recommends that these units be replaced with chilled water cooling equipment.
  
  The cooling tower is approximately 10 years old, the boiler is 15 years old, and the air handling unit that serves the locker and common areas is believed to be at the end of its useful life.
  
  The ESD report indicates that the air handling units serving the Gymnasium have reached their useful life, however, it is our understanding that they will be retained for some time.
  
• Building 480, Fire Sciences (10,024 SF): Building cooling and heating is provided by a nominal 60 ton air-cooled chiller, heating water boiler, and a multizone air distribution system.
  
• Building 481, General Studies (8,353 SF): Building cooling and heating is provided by a nominal 25 ton water cooled chiller system, a heating water boiler, and a variable volume air handling unit. Heating water is piped to VAV terminal unit reheat coils.
  
• Building 477, Science Lab (10,280 SF): Cooling is provided by a nominal 90 ton air cooled chiller. This building was renovated within the last four years, and its mechanical equipment is relatively new. Therefore, there is no work to be considered for building master planning.
  
• Building 426, Mortuary Science (6,383 SF): No work needed during the course of this master plan.
  
• Building 410, Aviation, Aerospace Technology (92,866 SF): The building has a 4-pipe cooling and heating system.
  
  Cooling is provided by two nominal 175 ton air-cooled chillers, and space heating from a natural gas-fired boiler. Area 400 at the west end of the building (approximately 15% of total building area) is currently evaporative cooled.
  
  Currently small rooms within this area are scheduled to be air conditioned, with air-cooled packaged AC units.

Basis for Evaluations
The specific requirements for each building are not defined at this time. Therefore, approximately 300 SF/Ton is used to estimate general building cooling loads. Science Building cooling load will be higher.

Scope of Work and Related Costs

• New Buildings: Building cooling will be provided by air handling units with chilled water cooling coils. Variable air volume air distribution systems will be provided for most building areas, and some areas may be served by constant volume systems.
  
  In general, electric building heating will be provided.
  
• Buildings South of East Tillman Avenue: Based on their evaluation of the ESD report, dated April 25, 2002, the District is proceeding with the following work:
  
  1. Two new water-cooled chillers will be installed in an existing exterior equipment area, along with two cooling towers and associated condenser and chilled water pumps at Building 470 (PEC). A canopy will be constructed over the chillers.
  2. This central plant installation will have sufficient cooling capacity to serve Buildings 470, 480, 481 (PEC, GSB and FSC) and the proposed 6,000 SF expansion area between Buildings 480 and 481 (GSB and FSC).
  3. Underground chilled water piping will be extended to serve Buildings 480, 481 and the 6,000 SF expansion. The piping in the central plant area, including the underground piping mains leaving the central plant, will be sized and valved connection provided, for the future extension of piping to serve Building 477 (SLB), and its 10,000 SF expansion.
  4. The existing chillers, towers, pumps, etc. will be removed at Buildings 470, 480 and 481 (PEC, GSB and FSC).
  5. New chilled water piping will connect to existing distribution piping in each of the three buildings.

The following work should be considered for master planning (with reference to the ESD April 25, 2002 report):

1. Building 470 - Replace air handling units, including providing chilled water units
   for racquetball courts $346,000
2. New separate building heating hot water boiler $ 52,000

• Cooling for Buildings North of East Tillman Avenue: The ESD report addressed the required replacement of the existing air-cooled chillers and associated equipment at Building 410 (ATC), with a more efficient water cooled system. With consideration of future building construction on the site, the provision of a new central plant building to serve multiple buildings is justified.
  
  Refer to the site drawings, associated with this master planning report, which show the proposed new central plant location and the conceptual chilled water pipe routing. This new central plant will initially have the capacity to provide cooling for the existing 410 Building (ATC) and the new Classroom/Office building, which results in a peak cooling load of approximately 345 tons. It could easily provide chilled water to 426 Building (MSB), but that building system would have to be converted from Dx cooling equipment.
  
  The central plant will be designed to accommodate additional campus cooling loads. One possibility is that it could serve the ASU Flight Simulator Building. Also piping could be extended to serve the future buildings south of E. Tillman Ave.
  
  The provision of this new central plant will be evaluated in a separate master planning activity and related costs determined.
  
  The cost for piping, as shown on the site drawing: $125,000
  
  
• Buildings 426, 477 and 481: These buildings have been addressed in a separate report.