INTRODUCTIOIN BUILDING STATISTICS · CareFirst Cumberland INTRODUCTIOIN Chan Mi Hwang Mechanical...

CareFirst Cumberland

INTRODUCTIOIN

Chan Mi Hwang Mechanical Option

• Introduction • Building Statistics • Location & Weather Condition

• Existing Condition • Thesis Proposal • Mechanical Depth

• Direct-Fired Chiller-Heater • Radiant Heating/Cooling Ceiling Panel

• Acoustical Breadth • Partition Replacement

• Conclusion

• Occupancy Type: Office

• Size: 46,793 SF

• Number of Stories: 2 Floor above grade

• Overall Project Cost: $13 million

• Construction Timeline: March 2010-May

2011

BUILDING STATISTICS

• Owner: CFBC Properties, LLC

• General Contractor: Carl Belt, Inc.

• Architects: VOA Associated, Inc.

• Civil Engineer: SPECS, Consulting Engineer

& Surveyors

• MEP Engineer: R.G. Vanderweil Engineers, LLP

• Structural Engineer: Tadjer Cher Edelson Assoiates, Inc.

CareFirst Cumberland Chan Mi Hwang Mechanical Option

• Introduction • Building Statistics • Location & Weather Condition

• Existing Condition • Thesis Proposal • Mechanical Depth

• Direct-Fired Chiller-Heater • Radiant Cooling Ceiling Panel


• Conclusion

INTRODUCTIOIN LOCATION WEATHER CONDION

Baltimore, MD Design Condition (0.4%) • Summer 93.9 °F DB 74.9 °F MCWB

• Winter 12.9°F DB


EXISTING CONDITION


• Introduction • Existing Condition

• Mechanical Design • Energy Model/Conclusion

• Thesis Proposal • Mechanical Depth



• Conclusion

MECHANICAL DESGIGN

• Ground-Coupled System 35-90 °F EWT 230 GPM Circulating pumps 1500 MBH Auxiliary Boiler 50 Tons Auxiliary Cooling Tower 55-85 °F GXWS

• Dedicated Outdoor Air System 9000 CFM RTU Enthalpy Recovery Wheel


EXISTING CONDITION







• Conclusion

Designed Condition

Cooling DB 75°F

Heating DB 70 °F

Relative Humidity 50 %

MECHANICAL DESGIGN

• 45 Geothermal Heat Pumps


EXISTING CONDITION







• Conclusion

-High initial investment cost

-High electricity consumption

-Low operating cost

-Zone thermal comfort control

-Forced air system

• Total Loads 153 Tons of Cooling 1784 MBH of Heating Annually 350,000 KWH Electricity Annually $37,283 Utility Cost

ENERGY MODELING CONCLUSION

2,600

2,700

2,800

2,900

3,000

3,100

3,200

3,300

3,400

3,500


THESIS PROPOSAL


• Introduction • Existing Condition • Thesis Proposal • Mechanical Depth



• Conclusion

• Reduce Initial Investment • Reduce Electrical Consumption • Increase Maintainability

GOALS PROPOSAL

• Reduce Initial Investment by replacing

Geothermal System to Chiller/Heater

• Reduce Electrical Consumption by replacing Heat pumps to radiant panel system

• Increase Maintainability by Central Plant


MECHANICAL DEPTH





• Conclusion

• Chiller/Heater Central Plant Absorption Chiller Cooling Tower Heater

• Rooftop Unit

Enthalpy Recovery Wheel Latent Load-Cooling Coil Precondition Heating Coil

• Radiant Cooling/Heating Panels

Chiller/Heater Cooling Tower

Radiant Panels Rooftop Unit PROSPOSED ALTERNATIVE

http://www.google.com/url?sa=i&rct=j&q=&esrc=s&frm=1&source=images&cd=&cad=rja&docid=4CGBfqF7E0zSaM&tbnid=Hq-qqrKzbn1pyM:&ved=0CAUQjRw&url=http://www.commercial.carrier.com/commercial/hvac/product_technical_literature/1,3069,CLI1_DIV12_ETI4906_PRD1171,00.html&ei=XN5gUbroMeq10QGb4YDoDw&bvm=bv.44770516,d.dmQ&psig=AFQjCNGYZmfo6Z9YUbg8VoD487uvLSMdsg&ust=1365389273312187


MECHANICAL DEPTH





• Conclusion

• Absorption refrigerant cycles

DIRECT-FIRED CHILLER/HEATER

• Heating Only

• Cooling Only

• Simultaneous Mode

OPERATION MODE


MECHANICAL DEPTH





• Conclusion

0

200

400

600

800

1000

1200

1400

1600

1800

2000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Monthly Loads of CareFirst, MBH

Heating Load

Cooling Load


INTEGRATED PART LOAD VALUE (IPLV)





• Conclusion • Partial load (IPLV)=1.193

MECHANICAL DEPTH

% Load TSA-DC C.O.P.

100 1

75 1.154

50 1.25

25 1.136

ARI #560-2000 Performance

0

200

400

600

800

1000

1200

1400

1600

1800

2000


Input & Output Energy Comparison of Chiller/Heater, MBH

Input Energy

Output Cooling

Output Heating


MECHANICAL DEPTH



• Direct-Fired Chiller-Heater • Radiant Heating/Cooling Ceiling Panel


• Conclusion

• Annually 65 Tons of Cooling Loads

• Annually 243 MBH of Heating Loads

0

100

200

300

400

500

600

700

800


Heating

Cooling

WASTE ENERGY IN SIMULTANEOUS MODE




• Acoustical Breath • Partition Replacement

• Conclusion

MECHANICAL DEPTH

• Superior Comfort

• Quiet Operation

• Lower Initial Investment Cost

• Flexible Installation

RADIANT CEILING PANEL INTEGRAL DIFFUSER PANEL





• Conclusion

MECHANICAL DEPTH

• Ventilation

• Latent load

• Condensation issue

• Water Design Approach

Dew Point Temperature

COOLING PANEL ISSUES





• Conclusion

MECHANICAL DEPTH

Occupant Latent Load

(Btu/h-person)

Number of

Occupancy

Total Latent Load

(Btu/h)

205 445 91225

LATENT LOAD RECOVERY

q_lat 0.69 CFM delta W

91225 0.69 9000 14.7

Required Latent Load





• Conclusion

MECHANICAL DEPTH

Required CL on cooling panel= (Total required CL) - (CL on Cooling coil)

SENSIBLE LOAD RECOVERY

q_sen 1.08 CFM delta_T

245916 1.08 9000 25.3

Sensible Load_Cooling coil

153 Tons (1836 MBH) - 246 MBH = 1590 MBH

q_tot 4.5 CFM delta_h

307800 4.5 9000 7.6

Grand Load_Cooling Coil

EWT LWT ΔT GPM EWT LWT ΔT EWT LWT ΔT

68.5 53 15.5 237 53 55.6 2.6 55.6 69.1 13.5

Water-Side Design

Chiller Cooling Coil Cooling Panel

DESIGN CONCLUSION





• Conclusion

MECHANICAL DEPTH

Airtite Radiant Panel w/ Center Slotted Air Diffuser • Total Required Cooling Load= 1590 MBH • Selected Cooling Panel Capacity = 72 BTUH/SF

• Total Cooling Panel Area= 22,000 SF

COOLING PANEL SELECTION COOLING PANEL LAYOUT


MECHANICAL DEPTH





• Conclusion

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

ELECTRICAL CONSUMPTION NATURAL GAS CONSUMPTION


MECHANICAL DEPTH





• Conclusion

$-

$500

$1,000

$1,500

$2,000

$2,500

$3,000

$3,500

$4,000

$4,500

0

50000

100000

150000

200000

250000

300000

350000

Existing Alternative

Distribution System

Central Plant

ENERGY COST INITIAL INVESTMENT COMPARISON


MECHANICAL DEPTH





• Conclusion

Capital Cost, $ Operation, $

Existing 321377 37283

Alternative 2 219200 41305

Investment Operation

Saving 102177 4022

Simple Payback Period,

years25.4

SIMPLE PAYBACK CONCLUSION

• Existing Higher Initial Investment Lower Operation Cost Zone Controllability

• Alternative Lower Initial Investment Higher Operation Cost Radiant + Convection Heat Transfer


ACOUSTICAL BREADTH





• Conclusion

• Alternative Noise Consideration Hot water pumps Condensed water pumps Chilled water pumps Chiller/Heater

NOISE CONSIDERATION ROOM LAYOUT


ACOUSTICAL BREADTH





• Conclusion

• ASHRAE Ch. 48 Noise and Vibration Control

Airborne path through partition

Receiver Consideration

Conference Room : NC-30

NOISE LEVEL REQUIREMENT EXISTING PARTITION


ACOUSTICAL BREADTH





• Conclusion • Existing Partition Noise Reduction

MECHANICAL NOISE LEVEL NOISE REDUCTION REQUIRED

OctaveBand Frequencies (Hz) 125 250 500 1000 2000 4000

SPL of all source in each Octave Band (dB) 86 81 79 77 67 63

Converted to A-weighted (dBA)

OctaveBand Frequencies (Hz) 125 250 500 1000 2000 4000

Noise in Mechanical Room (dB) 86 82 81 80 71 66

Background Noise Level in Conference (NC-35) 52 45 40 36 34 33

Required TL (dB) 34 37 41 44 37 33

• Assume all Noise Source Operating in Full Capacity


ACOUSTICAL BREADTH





• Conclusion

• 3-5/8” steel channel Studs with 2 layers of 5/8” gypsum boards both sides

PROPOSED PARTITION CONCLUSION

125 250 500 1000 2000 4000

Required TL (dB) 34 37 41 44 37 33

Proposed Partition 34 41 51 54 46 52

Remaining TL (dB) 0 -4 -10 -10 -9 -19

• Required NR comply

• Partition wall section

areas


CONCLUSTION





• Conclusion

• Alternative

Lower Initial Investment

Lower electrical consumption

Easier maintainability

CONCLUSION

QUESTION?

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