SLIDE 1 The Milton S. Hershey Medical Center Academic Support Building
ASHRAE Student Presentation Night April 9, 2003
Kari Anne Donovan Penn State University AE - Mechanical Option
SLIDE 2 Presentation Outline
- Existing Building Overview
- Distributed Chilled Water Feasibility Study
- Proposed Mechanical Redesign
– Integrated Fire Suppression and Hydronic Thermal Transport Systems – Electrical Service – Building Changes – Lighting Energy Savings
SLIDE 3 Existing Building Systems
– 5 story, 145,316 gross sq. ft – 19 million dollar project
– Mixed office use – Houses departments of Penn State College of Medicine and Hershey Medical Center
SLIDE 4
Building Layout
SLIDE 5 Existing Mechanical System
Points of Interest
distribution system
– Flexibility to accommodate
- ffice churn
- 7,513 sq. ft. return air
plenum mechanical penthouse
ventilation requirements not met
SLIDE 6
Distributed Chilled Water
Feasibility Study
SLIDE 7 Central Utility Plant
Conditions, 1998
12,5000 ton-hr capacity 1.4 mil gal CHWTR Storage Tank TES 1000 hp electric drive HCFC-22 1000 ton screw 9 1000 hp electric drive HCFC-22 1000 ton screw 8 1000 hp electric drive CFC-11 1000 ton centrifugal 7 Low Pressure Steam LiBr 800 ton absorber 6 1000 hp electric drive CFC-11 1000 ton centrifugal 5 1000 hp electric drive CFC-11 1200 ton centrifugal 4 Low Pressure Steam LiBr 800 ton absorber 3 Low Pressure Steam LiBr 800 ton absorber 2 Steam turbine drive CFC-11 1200 ton centrifugal 1
Summer 1997 – 9,5000 tons and 16,000 gpm Plant at full capacity
SLIDE 8 Energy Analysis Comparison
$26,070.07 $53,180.51 $79,250.58 Annual Energy Cost 522,466 kWh 1,065,742 kWh 1,588,188 kWh Annual Energy Usage 0.425 kW/ton 0.869 kW/ton 1.294 kW/ton Efficiency CUP Savings CUP Electric Mode Operation Existing Standalone System Chilled Water Production
SLIDE 9
Simple Payback Analysis
~ $260/ton for chiller and cooling tower installation ~ 2.7 year payback for the needed 450 tons with diversity factor of 60% ~ $52/ft of pipe installation ~ 9 year payback for the 4,500 ft run of distribution piping taken off the Mega-Structure supply.
SLIDE 10 Distributed Chilled Water
Feasibility Conclusion
CUP Benefits
- Reduced kW/ton of the CUP
- Increased efficiency and
energy savings
demand charge CUP Drawbacks
- No existing utility piping
- Remote building location
- CUP at full capacity
- Chiller #6 freeze-up and
replacement Recommendation: UTILITY SERVICE FROM CENTRAL UTILITY PLANT NOT ATTRACTIVELY FEASIBLE AT TIME OF DESIGN.
SLIDE 11
Dedicated Outdoor Air System with Parallel Sensible System
Reduced overall building height ASHRAE Standard 62 compliance Reduced building first cost and operating cost Improved IAQ and thermal comfort Reduced plenum height Reduced mechanical equipment size Reduced electrical service for penthouse
SLIDE 12
SLIDE 13
Dedicated Outdoor Air System
(DOAS)
SLIDE 14
SLIDE 15
SLIDE 16
Radiant Panel System
SLIDE 17 Installation Comparison
- DOAS/Radiant installation cost $367,122
less than existing system
–IAQ and personal thermal comfort vs. Productivity –Control Valves
- Control Packages not included
SLIDE 18 Energy Savings
Proposed Redesign Existing 3,342,631 kBTU 8,210,545 kBTU Total 168,664 kWh 849,205 kWh Fans 67,523 kWh 30,267 kWh Pumps 726,758 kWh 503,723 kWh Chiller
Annual Savings of 4,867,914 kBTU - $43,352 Recommendation: ENERGY SAVINGS & BENEFIT OF IMPROVED IAQ CAN POTENTIALLY OFFSET AN INCREASE IN CONTROLS COST.
SLIDE 19
Fire Suppression and Hydronic Thermal Transport System Integration
NFPA 13 allows dual use of sprinkler piping for other purposes
–Life safety requirements always come first –Water for sprinkler service must not pass through auxiliary equipment –Shut-off valves for auxiliary service –Closed-loop circulating system, less than 120F water temperature –No water additives to inhibit suppression
SLIDE 20
SLIDE 21
SLIDE 22 Fire Suppression and Hydronic Thermal Transport System Integration
– $75,540
Typical Radiant Cooling Panel Piping Detail
- High interaction of disciplines during design and
construction
controls
SLIDE 23 Electrical Service
System Comparison
17.9 kW 32.5 kW Pump 401.9 kW 854.7 kW Total 0.1 kW 0 kW ER 343.8 kW 607.8 kW Chiller 40.0 kW 214.5 kW Fan Redesign Existing Equipment Transformer resized from 1500 kVA to 1000 kVA First Cost Savings $4,400
SLIDE 24 Overall Building Changes
- Access Flooring Height Reduction
- 1’-3” to 6”
Total Building Height Reduction: 5’-0”
- Return Air Plenum Height Reduction
- 1’-9” to 1’-6”
- Total Floor to Floor Height Reduction
- 1’-0”
SLIDE 25 Overall Building Changes
- Pre-Cast Concrete Panel Savings
– $175,610
Total Building Height Reduction Savings: $176,820
- Structural Steel Column Height Savings
–$1,210
SLIDE 26
Penthouse Changes
SLIDE 27
Penthouse Changes
SLIDE 28 Penthouse Changes
- First Cost Savings on roofing and Steel
Panels
– $6,525
- Reduction in chiller vibration and high
frequency compressor noise perceived on 5th floor
SLIDE 29 Lighting Energy Savings
- De-clutters ceiling to allow for radiant panels
- Change T8 to T5 lamps
–Reduce number of units by 57% –Reduce installation cost by $44,141 (30%) –Annual Energy Savings of $567
SLIDE 30
Proposed Integrated Redesign Potential Savings:
$594,608 Installation Cost Savings* $43,920 Annual Energy Savings
SLIDE 31
Questions?
