C ARL R. D ARNALL A RMY M EDICAL C ENTER M ARISSA C ALDWELL M ECHANICAL O PTION
C ARL R. D ARNALL A RMY M EDICAL C ENTER B UILDING OVERVIEW T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS E NERGY C OMPARISON S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION
B UILDING O VERVIEW B UILDING OVERVIEW T HESIS G OALS O WNER : A RMY C ORPS OF E NGINEERS D EPTH D EPARTMENT OF D EFENSE – UFC S TANDARD 4-510 D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW L OCATED ON F ORT H OOD B ASE , OUTSIDE OF K ILLEEN , TX W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS F LOOR A REA : 900,000 SQ FT E NERGY C OMPARISON S TRUCTURAL B READTH R EPLACING THE CURRENT C ARL R. D ARNALL A RMY M EDICAL C ENTER ACROSS STREET C ONSTRUCTION B READTH C ONCLUSION
B UILDING O VERVIEW B UILDING OVERVIEW P ATIENT R OOMS T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW M EDICAL S UPPORT L EVEL 5 W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS C ONFERENCE E NERGY C OMPARISON O FFICES S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION L EVEL 6 L IBRARY
B UILDING O VERVIEW B UILDING OVERVIEW T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW L EVEL 5 W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS E NERGY C OMPARISON S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION L EVEL 6
M ECHANICAL S YSTEM B UILDING OVERVIEW C OOLING S YSTEM H EATING S YSTEM T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS E NERGY C OMPARISON S TRUCTURAL B READTH (4) 1,300 TON CENTRIFUGAL CHILLERS (4) 11,700 MBH STEAM BOILERS C ONSTRUCTION B READTH (4) 18,000 MBH COOLING TOWERS L OW N OX BURNER & BOILER STACK ECONOMIZER C ONCLUSION (1) 200 TON HEAT RECOVERY CHILLER (3) S TEAM TO WATER HEAT EXCHANGER D OMESTIC HOT WATER & CHILLED WATER S TEAM FOR HUMIDIFICATION & STERILE EQUIPMENT P ROVIDES 44°F TO AHU S P ROVIDES 140°F TO AHU S AND CAV S
M ECHANICAL S YSTEM B UILDING OVERVIEW A IRSIDE S YSTEM T HESIS G OALS D EPTH G ENERAL G ENERAL HWS WHEEL D EDICATED O UTDOOR A IR S YSTEM E XHAUST E XHAUST 140 ° F SHU CHWS 44 ° F SUPPLY AIR V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS HEATING COIL COOLING COIL PRE- HUMIDIFIER E NERGY C OMPARISON ENTHALPY CONDITIONED FILTER OUTDOOR FAN S TRUCTURAL B READTH AIR C ONSTRUCTION B READTH E NTHALPY WHEEL TO PRECONDITION OUTDOOR AIR C ONCLUSION (2) 45,000 CFM AIR HANDLER PROVIDING 55°F AIR C ONSTANT A IR V OLUME TERMINAL UNITS WITH REHEAT HWR CHWR SHUC 110 ° F 60 ° F
B UILDING OVERVIEW R EDUCE E NERGY E CONOMICALLY F EASIBLE T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS E NERGY C OMPARISON S AFE C OMMUNITY S TRUCTURALLY S TABLE S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION
V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP B UILDING OVERVIEW T HESIS G OALS L OW P RESSURE L INE D EPTH V APOR S UCTION L INE D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW H IGH P RESSURE L INE W ATER S OURCE H EAT P UMP A IR Q UALITY A NALYSIS E NERGY C OMPARISON S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION
D EDICATED O UTDOOR A IR S YSTEM Baseline DX Cooling Natural Gas B UILDING OVERVIEW Fan Energy Design DOAS Unit Coil Coil T HESIS G OALS 400,000.0 DOAS Unit Supply OA OA Supply Total Capacity Total Capacity 350,000.0 D EPTH Total Fan Energy (kWh) 61,846.7 (cfm) (cfm) (MBH) (MBH) 300,000.0 D EDICATED O UTDOOR A IR S YSTEM L5 AHU 26,090 7,380 360 80 250,000.0 V ARIABLE R EFRIGERANT F LOW L6 AHU 37,075 10,366 300 60 200,000.0 139,643.3 W ATER S OURCE H EAT P UMP 150,000.0 301,011.8 A IR Q UALITY A NALYSIS 37,378.0 100,000.0 E NERGY C OMPARISON 108,468.0 50,000.0 88,171.4 S TRUCTURAL B READTH 0.0 Baseline WSHP VRF C ONSTRUCTION B READTH DOAS Energy Terminal Unit Fan C ONCLUSION DOAS DELIVERS AIR DIRECTLY TO THE SPACE IN VRF SYSTEM E NTHALPY WHEEL WITH GENERAL EXHAUST WSHP REDUCES BY 32%, VRF REDUCES BY 60%
V ARIABLE R EFRIGERANT F LOW B UILDING OVERVIEW L OW P RESSURE L INE T HESIS G OALS V ARIABLE R EFRIGERANT F LOW W ITH R-410A D EPTH V APOR S UCTION L INE I NDOOR VRF UNITS HAVE THE ABILITY TO OPERATE AS D EDICATED O UTDOOR A IR S YSTEM A CONDENSER AND A EVAPORATOR V ARIABLE R EFRIGERANT F LOW H IGH P RESSURE L INE C ONSISTS OF 3 PIPES : LOW PRESSURE , HIGH PRESSURE W ATER S OURCE H EAT P UMP & VAPOR SUCTION LINE A IR Q UALITY A NALYSIS H EAT RECOVERY V S . HEAT PUMP E NERGY C OMPARISON D EFROST O PERATION S TRUCTURAL B READTH C ONSTRUCTION B READTH C ONCLUSION
ASHRAE 15 C OMPLIANCE B UILDING OVERVIEW ASHRAE 15 R EFRIGERANT C HARGE L IMIT T HESIS G OALS Highly Toxic or Toxic RCL OEL Safety Under Code D EPTH ppm v/v lb/Mcf g/m^3 (ppm/v/v) Group Classification D EDICATED O UTDOOR A IR S YSTEM R-410A 1,000 A1 140,000 13 420Neither L EVEL 5 V ARIABLE R EFRIGERANT F LOW R EFRIGERANT C HARGE C ALCULATIONS W ATER S OURCE H EAT P UMP # Outdoor Unit Capacity RCL Comply with A IR Q UALITY A NALYSIS Zone Zone Indoor (tons) (lb/Mcf) ASHRAE 15? Configuration Cooling Heating Units E NERGY C OMPARISON Zoning 1 L5 South Exterior 264,000 297,000 22 23 22.14NO L EVEL 6 L5 South East Ext 144,000 162,000 12 12 19.50NO S TRUCTURAL B READTH Zoning 2 L5 South West Ext 120,000 135,000 10 11 19.76NO C ONSTRUCTION B READTH L5 South West Ext 96,000 108,000 8 11 12.17YES I NSTITUTIONAL O CCUPANCY & I NDIRECT C LOSED S YSTEM L5 S Exterior Zone 96,000 108,000 8 10 12.15YES Zoning 3 C ONCLUSION C ONCENTRATION MAY NOT EXCEED 50% LISTED IN TABLE 4-1 L5 SE Exterior Zone 96,000 108,000 8 10 11.82YES L5 SE Corner Zone 96,000 108,000 8 10 11.68YES M ULTI -V R EFRIGERANT C HARGE C ALCULATOR S MALL ROOMS USE IN - DUCT VRF INDOOR UNITS
ASHRAE 15 C OMPLIANCE B UILDING OVERVIEW ASHRAE 15 R EFRIGERANT C HARGE L IMIT T HESIS G OALS Highly Toxic or Toxic RCL OEL Safety Under Code D EPTH ppm v/v lb/Mcf g/m^3 (ppm/v/v) Group Classification D EDICATED O UTDOOR A IR S YSTEM R-410A 1,000 A1 140,000 13 420Neither V ARIABLE R EFRIGERANT F LOW R EFRIGERANT C HARGE C ALCULATIONS W ATER S OURCE H EAT P UMP # Outdoor Unit Capacity RCL Comply with A IR Q UALITY A NALYSIS Zone Zone Indoor (tons) (lb/Mcf) ASHRAE 15? Configuration Cooling Heating Units E NERGY C OMPARISON Zoning 1 L5 South Exterior 264,000 297,000 22 23 22.14NO L5 South East Ext 144,000 162,000 12 12 19.50NO S TRUCTURAL B READTH Zoning 2 L5 South West Ext 120,000 135,000 10 11 19.76NO C ONSTRUCTION B READTH L5 South West Ext 96,000 108,000 8 11 12.17YES I NSTITUTIONAL O CCUPANCY & I NDIRECT C LOSED S YSTEM L5 S Exterior Zone 96,000 108,000 8 10 12.15YES Zoning 3 C ONCLUSION C ONCENTRATION MAY NOT EXCEED 50% LISTED IN TABLE 4-1 L5 SE Exterior Zone 96,000 108,000 8 10 11.82YES L5 SE Corner Zone 96,000 108,000 8 10 11.68YES M ULTI -V R EFRIGERANT C HARGE C ALCULATOR S MALL ROOMS USE IN - DUCT VRF INDOOR UNITS
Z ONING B UILDING OVERVIEW T HESIS G OALS D EPTH D EDICATED O UTDOOR A IR S YSTEM V ARIABLE R EFRIGERANT F LOW W ATER S OURCE H EAT P UMP L EVEL 5 L EVEL 6 A IR Q UALITY A NALYSIS E NERGY C OMPARISON # Outdoor Unit Capacity RCL Comply with Zone Indoor Zone I NTERIOR & EXTERIOR ROOMS PLACED ON SAME SYSTEM (tons) (lb/Mcf) ASHRAE 15? S TRUCTURAL B READTH Configuration Cooling Heating Units Zoning 1 L5 South Exterior 264,000 297,000 22 23 22.14NO Z ONES BASED ON THE S E XTERIOR Z ONE ’ S OUTDOOR C ONSTRUCTION B READTH L5 South East Ext 144,000 162,000 12 12 19.50NO Zoning 2 UNIT ’ S CAPACITY L5 South West Ext 120,000 135,000 10 11 19.76NO C ONCLUSION L5 South West Ext 96,000 108,000 8 11 12.17YES F OUR WAY CASSETTES FOR PATIENT ROOMS , IN - DUCT FOR L5 S Exterior Zone 96,000 108,000 8 10 12.15YES Zoning 3 L5 SE Exterior Zone 96,000 108,000 8 10 11.82YES OFFICES L5 SE Corner Zone 96,000 108,000 8 10 11.68YES
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