The Milton S. Hershey Medical Center Academic Support Building AE Senior Thesis Kari Anne Donovan Mechanical Option
Presentation Outline Existing Conditions Distributed Chilled Water Feasibility Study Dedicated Outdoor Air / Radiant Panel System Study Integrated Systems Study Summary Kari Anne Donovan - Mechanical Option 2
Existing Conditions Building Overview Project Description 5 story 146,316 gross sq ft $19 million Building Function Mixed office use Departments of Penn State College of Medicine and Hershey Medical Center Kari Anne Donovan - Mechanical Option 3
Existing Conditions Building Layout Kari Anne Donovan - Mechanical Option 4 N
Existing Conditions Mechanical System VAV underfloor air distribution system Underfloor junction boxes 7,513 sq ft return air plenum mechanical penthouse ASHRAE Standard 62 ventilation requirements not met! Kari Anne Donovan - Mechanical Option 5
Distributed Chilled Water Feasibility Study Campus Distributed Utilities Map ACADEMIC SUPPORT BUILDING MEGA-STRUCTURE N CAMPUS UTILITY PLANT Kari Anne Donovan - Mechanical Option 6
Distributed Chilled Water Feasibility Study Central Utility Plant 1 1200 ton centrifugal CFC-11 Steam turbine drive 2 800 ton absorber LiBr Low Pressure Steam 3 800 ton absorber LiBr Low Pressure Steam 4 1200 ton centrifugal CFC-11 1000 hp electric drive 5 1000 ton centrifugal CFC-11 1000 hp electric drive 6 800 ton absorber LiBr Low Pressure Steam 7 1000 ton centrifugal CFC-11 1000 hp electric drive 8 1000 ton screw HCFC-22 1000 hp electric drive 9 1000 ton screw HCFC-22 1000 hp electric drive TES CHWTR Storage Tank 1.4 million gal 12,5000 ton-hr capacity Summer 1997 - Plant at full capacity 9,500 tons and 16,000 gpm Kari Anne Donovan - Mechanical Option 7
Distributed Chilled Water Feasibility Study Energy Analysis Chilled Water Production Efficiency Annual Energy Consumption Annual Energy Cost Existing Standalone System 1.294 kw/ton 1,588,188 kwh $79,250.58 CUP Electric Mode Operation 0.869 kw/ton 1,065,742 kwh $53,180.51 CUP Savings 0.425 kw/ton 522,466 kwh $26,070.07 Kari Anne Donovan - Mechanical Option 8
Distributed Chilled Water Feasibility Study Simple Payback Added Capacity $260/ton 2.7 year payback (60% load diversity) Added Distribution Piping $52/ft 9 year payback Kari Anne Donovan - Mechanical Option 9
Distributed Chilled Water Feasibility Study Conclusion CUP Benefits Reduced kw/ton of the CUP Increased efficiency and energy savings Reduced campus electric demand charge CUP Drawbacks No existing utility piping Remote building location CUP at full capacity Chiller #6 freeze-up and replacement UTILITY SERVICE FROM CENTRAL UTILITY PLANT NOT ATTRACTIVELY FEASIBLE AT TIME OF DESIGN. Kari Anne Donovan - Mechanical Option 10
Dedicated Outdoor Air / Radiant Panel System Study Overview ASHRAE Standard 62 compliance Improved IAQ and thermal comfort Reduced building first and operating costs Reduced mechanical equipment size Reduced electrical service for penthouse Reduced plenum height Reduced overall building height Kari Anne Donovan - Mechanical Option 11
Dedicated Outdoor Air / Radiant Panel System Study Dedicated Outdoor Air Schematic EXHAUST AIR (18,120 cfm) (14,360 cfm) OUTDOOR AIR (18,120 cfm) (14,360 cfm) RECIRCULATED AIR (from return air shaft) (7.5 HP) (6 HP) Exhaust Fan N.O. Motorized Dampers (linked) N.O. OA Temperature Sensor N.C. Filter HWR HW HWS (736 MBH) (568 MBH) 20 HP Supply Fan Total Energy Recovery Wheel Low Temp Sensor SUPPLY AIR (18,120 cfm) (14,360 cfm) Kari Anne Donovan - Mechanical Option 12 Filter CHWR CHW CHWS (1086 MBH) (845 MBH) Proposed Air Handling Unit Schematic East West Supply Temp Sensor Supply Humidity Sensor RETURN AIR (18,120 cfm) (14,360 cfm) Air Flow Monitoring Station
Dedicated Outdoor Air / Radiant Panel System Study Dedicated Outdoor Air Layout N Kari Anne Donovan - Mechanical Option 13
Dedicated Outdoor Air / Radiant Panel System Study Radiant Panel Layout N Kari Anne Donovan - Mechanical Option 14
Dedicated Outdoor Air / Radiant Panel System Study Equipment Comparison Chillers Boilers Cooling Coils Heating Coils Supply Air Volume Outdoor Air Volume Supply Air Temperature Existing System 450 tons 4845 MBH 3980 MBH 5020 MBH 170,000 cfm 15,000 cfm 60 F Proposed Redesign 267 tons 5685 MBH 1931 MBH 1304 MBH 32,480 cfm 32,480 cfm 45 F Change - 40% + 17% - 51% - 74% - 80% + 116% - 25% Kari Anne Donovan - Mechanical Option 15
Dedicated Outdoor Air / Radiant Panel System Study Energy Analysis Chillers Pumps Fans Total Existing System 558,248 kwh 30,267 kwh 849,205 kwh 8,396,638 kbtu Proposed Redesign 726,758 kwh 67,523 kwh 168,664 kwh 3,342,631 kbtu Change + 30% + 123% - 80% - 60% Kari Anne Donovan - Mechanical Option 16
Dedicated Outdoor Air / Radiant Panel System Study Energy Savings Fans Cooling Heating Pumps Total Existing System $49,339 $32,316 $19,892 $1,760 $103,306 Proposed Redesign $9,315 $40,389 $320 $3,728 $56,298 Change - 81% + 25% - 98% + 112% - 45% Kari Anne Donovan - Mechanical Option 17
Integrated Systems Study Proposed Redesign Impact on Building Systems Fire Protection Electrical Service Overall Building Changes Lighting Kari Anne Donovan - Mechanical Option 18
Integrated Systems Study Fire Suppression System Integration NFPA 13 Life safety requirements always come first Closed-loop loop circulating system <120F water No water additives to inhibit suppression Shut-off valves for auxiliary service Water for sprinkler service must not pass through auxiliary equipment Kari Anne Donovan - Mechanical Option 19
Integrated Systems Study Fire Suppression System IntegrationDedicated Outdoor Air System Coils CHW CHW Expansion Tank Fire Water Source Return from Lower Floors Radiant Panel Groups CHW Make-up Assembly Air Separator Fire Pump/Jockey Pump Assembly FP1P# FP2P# Radiant Panel Groups CHWP1 P# CHWP2 P# Alarm Valve Typcial Radiant Cooling Panel Service to Floor (by wing) Sprinkler (typical) Air-Cooled Chiller Proposed Chilled Water System Schematic Integrated Fire Suppression System Kari Anne Donovan - Mechanical Option 20 Radiant Panel Groups Note: Manual isolation valves not shown for clarity. V1 Hose Outlet CK V1 V2 Service to Lower Floors CHWP3 P# CHWP4 P# Normal Flow Fire Flow Return from Opposite Wing Service to Opposite Wing
Integrated Systems Study Fire Suppression System Integration N Kari Anne Donovan - Mechanical Option 21
Integrated Systems Study Fire Suppression System Integration Redundant Piping Savings $75,540 (52%) Added 1 st cost for controls High interaction of disciplines during design and construction Kari Anne Donovan - Mechanical Option 22
Integrated Systems Study Electrical Service Equipment Fans Chillers Pumps ER Total Existing System 214.5 kw 607.8 kw 32.5 kw 0 kw 854.7 kw Proposed Redesign 40.0 kw 343.8 kw 17.9 kw 0.1 kw 401.9 kw Change - 174.5 kw - 264.0 kw - 14.6 kw + 0.1 kw - 452.8 kw Transformer resized from 1500 kva to 1000 kva First Cost Savings $4,400 Kari Anne Donovan - Mechanical Option 23
Integrated Systems Study Overall Building Changes Access Flooring Return Air Plenum Total Existing System 1-3 1-9 3-0 Proposed Redesign 0-6 1-6 2-0 Change 0-9 0-3 1-0 First Cost Savings $183,347 Pre-cast concrete panel savings $175,610 Structural steel column savings $1,210 Penthouse savings $6,527 Kari Anne Donovan - Mechanical Option 24
Integrated Systems Study Lighting Energy Savings Change T8 to T5 lamps Reduce number of units by 43% Reduce installation cost by $44,141 (30%) Annual Energy Savings of $567 De-clutters ceiling to allow for radiant panels Kari Anne Donovan - Mechanical Option 25
Recommendation Summary ASHRAE Standard 62 compliance Improved IAQ and thermal comfort Reduced building first cost and operating cost [$231,888 (1.2%) and $43,919 (45%)] Reduced mechanical equipment size Reduced electrical service for penthouse Reduced return air plenum height Reduced overall building height PROPOSED MECHANICAL SYSTEM REDESIGN AND IMPACT ON INTEGRATED SYSTEMS ALLOWS FOR IMPROVED PERFORMANCE OVER EXISTING BUILDING SYSTEMS. Kari Anne Donovan - Mechanical Option 26
Questions Special Thanks to AE Department Dr. Stan Mumma Terry Achey Director of Facilities, Penn State College of Medicine Facilities Staff, Penn State College of Medicine Family and Friends Kari Anne Donovan - Mechanical Option 27
Dedicated Outdoor Air / Radiant Panel System Study Supply Air Conditions Low SAT and DPT Best first and operating costs Maintain a space RH 45% or less ASHRAE Space RH healthy guidelines Kari Anne Donovan - Mechanical Option 28
Dedicated Outdoor Air / Radiant Panel System Study Supply Air Conditions Typical Office (2 people, 154 ft 2 ) Q l =400 Btu/hr 400 Btu/hr=0.68 (40 cfm) ) (w( rm - 43 gr/lb) w rm = 57.7 gr/lb @ 75F = 44% RH Q s =3,600 Btu/hr Q s air =1.08 (40 cfm) ) (75F 45F) = 1,296 Btu/hr Q s panel =3,600 1,296 = 2,304 Btu/hr @ 60 Btu/hr-ft 2 38 ft 2 (25% floor area) @12.38 ft 2 /panel 4 panels Kari Anne Donovan - Mechanical Option 29
Dedicated Outdoor Air / Radiant Panel System Study CHWS Temperature CHWS Temperature 53F 3F Safety margin Room Dewpoint 50F Kari Anne Donovan - Mechanical Option 30
Dedicated Outdoor Air / Radiant Panel System Study Chiller Information Existing Chillers (2) 1.29 kw/ton 225 tons 540 gpm 42F LWT 52F EWT Proposed Chiller 1.29 kw/ton 267 tons 405 gpm 40F LWT 55.8F EWT Kari Anne Donovan - Mechanical Option 31
Dedicated Outdoor Air / Radiant Panel System Study Cooling Plant Information Existing Cooling Coil Load 5,806,117 kbtu Chiller Load 5,837,291 kbtu Q s =1.08 cfm DT Q l =0.68 cfm Dw Proposed Cooling Coil/Panel Load 7,615,087 kbtu 31% increase Chiller Load 7,794,809 kbtu 34% increase Kari Anne Donovan - Mechanical Option 32
Dedicated Outdoor Air / Radiant Panel System Study Proposed Redesign Installation Cost $367,122 less than existing system Control packages not included Control valves vs. Productivity Kari Anne Donovan - Mechanical Option 33