Figure 38 Building Heights across Campus

UTILITIES / MECHANICAL, ELECTRICAL, AND PLUMBING

MECHANICAL SYSTEMS

Existing Conditions Central Cooling Plants

Based on the Utility Infrastructure Failure Analysis and Impact Assessment report dated February 24, 2014, the majority of the cooling and heating needs for the campus are currently met by two (2) central utility plants (CUP), providing chilled water (CHW) and heating hot water (HHW) to a common distribution loop which feeds the majority of the buildings on campus. The remainder of the campus buildings have independent HVAC systems. The two (2) CUPs serving approximately 2.5 million (M) gross square feet (GSF) of building space are listed below –

1. Main Central Plant (1992) –

McCarthy Hall 2. Tri-Generation Plant (2008) –

Adjacent of McCarthy Hall There are two (2) thermal energy storage (TES) tanks that assist the campus in generating and storing CHW and HHW during the off-peak periods –

1. CHW TES Tank – 2.53M Gallons 2. HHW TES Tank – 466 Thousand

Gallons The main central plant has three (3) water cooled chillers and one (1) heat recovery chiller. Total capacity of these four (4) chillers are 4,300 tons. Based on ASHRAE Equipment Life Expectancy, all of these four (4) chillers are at the end of their useful life and should be replaced. There is a vacant bay available for a new chiller in this chiller plant. The Trigeneration plant has two (2) absorption chillers with total cooling capacity of 2,200 tons. The main central plant is primarily used as a back-up system to the TriGeneration plant for CHW. Based on the 2014 report, current peak cooling load of the buildings served by the two (2) CUPs are 4,900 tons. The 2.53M Gallon CHW TES Tank has cooling capacity of 28,000 ton-hours, which can store CHW required for almost 6 hours of campus cooling.

The CHW and HHW from the two (2) CUPs are distributed through main piping in utility tunnels (80%) and branch piping that are direct buried underground or in utilidors (20%). The 40-50 year old CHW and HHW distribution piping are experiencing leakage at various sections of the campus and should be replaced. The existing distribution systems do not have adequate isolation valves.

1. CHW Distribution – Two (2)-pipe system 2. HHW Distribution – Combination of two (2)-pipe, three (3)-pipe and four (4)-pipe system Each CUP has independent primary CHW pumps and shared secondary CHW distribution pumps. The secondary distribution CHW pumps are not able to meet the hydraulic demand during peak cooling.

There are three (3) architectural cooling towers and six (6) condenser water pumps serving the two (2) CUPs. The condenser water system has controls issues which has resulted in ruptured lines. Central Heating Plants

The campus high temperature HHW system was converted to low temperature HHW system in 2008. The two (2) absorption chillers from the Tri-generation plant have heating capacity of total 24,400 MBH. The heat recovery chiller in the main central plant has heating capacity of 18,800 MBH. This heat recovery chiller is at the end of its useful life as mentioned before and should be replaced. The main central plant is primarily used as a back-up system to the Tri-Generation plant for HHW. Based on the 2014 report, current peak heating load of the buildings served by the two (2) CUPs are 31,000 MBH. Domestic hot water is produced at the building level by utilizing the HHW from the CUPs. Current peak domestic hot water load of the buildings served by the CUPs are 5,300 MBH. The 466K Gallon HHW TES Tank has heating capacity of 128,000 kBTU, which can store HHW required for about 3.5 hours of campus heating (space heating and domestic).

Each CUP has independent primary HHW pumps and shared secondary HHW distribution pumps. The secondary distribution CHW pumps are not able to meet the hydraulic demand during peak cooling. Independent Cooling and Heating Plants

The following is a brief overview of the independent cooling and heating plants in various buildings on campus; all of these systems are in good working condition based on the 2014 report –

1. Three (3) steam boilers –

Laboratories in McCarthy

Hall and Dan Black Hall (Total capacity: 3,225 MBH) 2. One (1) 80-ton air cooled Chiller –

Data Center in Library (Backup) 3. Two (2) 300-ton air cooled chillers – Titan Student Union (Campus

CHW lines for Backup) 4. Two (2) 2000 MBH Boilers – Titan

Student Union (Campus HHW lines for Backup) 5. Two (2) 400-ton water cooled

Chillers – Housing Phase 3 6. Four (4) 1,590 MBH Boilers –

Housing Phase 3

Figure 92. Existing Chilled Water and Heating Hot Water System