ME 5575 PROJECT

December 20, 2010

Marque Cross

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Project selected

• Building is to be placed in Phoenix, AZ.

• Building Area needs to be around 160,000 square feet.

• Building should fit within a 35,000 square foot lot, parking provided

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Rules of thumb

• Heating/Cooling– Interior of office building

• AC in square feet per ton = 350• Heating in BTUH/CFM = 3

– Exterior of office building• AC wise = 275• Heating wise = 3

– On average• AC wise = 312.5• Heating wise = 3

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Rules of thumb

• Capital Cost estimates– Cooling $1600 per ton– Fan/ductwork, system $7.65/CFM– Heating $2.65/CFM

• Annual Energy Use– Office building 30.5 KW/square foot– Sustainable electric 15 KW/square foot

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Rules of Thumb

• Annual energy cost– Electric $.085/KWh– Gas heating $.75/them

• 400 CFM/ton estimation for air flow• 1.2 CFM/square foot for the area

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Outdoor Condition

• Office building in Phoenix, AZ seemed closer to the Sky harbor airport.– Winter at 99% assuming 60% RH, DB

temperature 41.3 degrees F– Summer at 1%

• Cooling DB 108.3 degrees F• Evaporator WB 75.2 degrees F

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Preliminary Calculations

• Sizing of air conditioning unit– 512 tons from calculations

• Size of heating system– 4,800 MBH required

• Air handling unit– Taking 512 tons of cooling and the

building area, Average size 198,400 CFM

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Preliminary Calculations

• System Cost– $819,000 cooling cost– $525,000 heating cost– $1.5 million Equipment cost

• Anticipated Energy Cost– Electric at $.085, $414,800 cost– Sustainable, $204,000

• Should save $210,800 if using sustainable design

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Building 3D view

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Building footprint

• Given 160,000 square foot on 35,000 square foot lot– 14 story office building

• Aspect 3-to-1 X=3y– X1 = 186.99 ft Y1= 63.33 ft– X2 = 50 ft Y2= 60 ft– Floor-to-ceiling 10 ft

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eQuest

• A baseline run followed by two different runs was performed using the eQuest program– Two runs

• 2 chilled and hot water coils with a standard VAV system with HW reheat

• Using evaporative cooling

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eQuest First Run

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eQuest First Run

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eQuest First Run

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eQuest First Run

• Equipment Used– Carrier Aqua flow 30xw chiller

• Electric hermetic– COP 6.1 -6.4– Supports up to 400 tons of cooling– Twin screw compressors– Full load at .631 kw/ton– Based on features, ASHRAE 90.1 compliant

– Global industry pt-399 boiler• Up to 95% efficiency• BTU range 122 -399 MBH• Natural gas or propane

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eQuest First Run

• Equipment used cont.– Mokon water cooling tower

• All-season reliability• Supports from 8 tons and up

– Goulds A-c Series 2000 model 150• 200 hp motor• Flows up to 3100 GPM• Supports temperatures up to 250 degrees

F

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eQuest Second Run

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eQuest Second Run

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eQuest Second Run

• Equipment used roughly the same with the exception of the evaporator– Aztec direct/indirect system

• Air delivery 1,500- 37,500 CFM• Energy efficient• Preferred sustainable method of cooling

– No compressors nor refrigerants– CFC-free cooling (Chlorofluorocarbon)

• Water saving

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eQuest Run Comparison

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eQuest Run Comparison

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eQuest Run Comparison

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eQuest Run Comparison