natatorium design:natatorium design2011%20natatorium%20design.pdf · design issuesdesign issues •...
TRANSCRIPT
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Natatorium Design:Natatorium Design:better building and gmechanical system
performance.
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February 15, 2004 MoscowFebruary 15, 2004 Moscow
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Design IssuesDesign Issues• Moisture Load
calculation• Air Distribution• Duct Design
• Condensation Control• Pool Water
Duct Design• Cooling
H i• Pool Water ChemistryE h Ai
• Heating• Energy recovery
• Exhaust Air• Outdoor Air
• Mechanical dehumidification
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Design Criteria #1:Establish the
Space Dew Point
Everything vital to the poolEverything vital to the poolis based on this value.
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Dew PointDew Point
100% 82ºF 50%RH62 º50%.62°
= 62 ºF DP70ºF 50%RH70ºF 50%RH= 50 ºF DP
82°
50 F DP82
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AnyAny surfacesurface belowbelow
62°F will62 F will condense moisture
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Why does water evaporate?Space dew point has a Vapor pressure
Water surface has a Vapor pressureW e su ce s V po p essu e
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Why does water evaporate?Why does water evaporate?At 50% RH: Pw ~ 2 Pdp
(P
p
(Pdp) Vapor pressure of dew point
(Pw) Vapor pressure at water surface(Pw) Vapor pressure at water surface
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Evaporation Rate Calculation
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E i REvaporation Rate
Lb/h = 0.1 x A x ΔP x AF • A: Water Area; ft²
•ΔP: Δ Vapor pressure; inches Hg
•AF: Activity Factor (0.5 = Baseline)
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E i REvaporation Rate
Lb/h = 0.1 x A x ΔP x AF Typical calculation has 2 scenarios:
• AF = 0.5 and space @ 50% (night)
• AF = 1.0 and space @ 60% (active)
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Typical Design Conditions
Pool TypeAir
Pool TypeTemperature
Competition 78 to 85 °FDi i 80 t 85 °FDiving 80 to 85 °FElderly
Swimmers 84 to 90 °FSwimmersHotel 82 to 85 °F
Physical 80 to 85 °FyTherapy 80 to 85 °F
Recreational 82 to 85 °FWhirlpool/spa 80 to 85 °F
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Typical Design Conditions
Pool Type Water Temperature
Activity FactorTemperature Factor
Competition 76 to 82 °F 0.65Diving 84 to 88 °F 0.65Diving 84 to 88 F 0.65Elderly
Swimmers 85 to 90 °F 0.8
Hotel 82 to 86 °F 0.8 – 1.0Physical Th 90 to 95 °F 0.65Therapy 90 to 95 F 0.65
Recreational 80 to 85 °F 1.0Whirlpool/spa 102 to 104 °F 1 0Whirlpool/spa 102 to 104 °F 1.0
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Knowing the activity level inKnowing the activity level in advance is important
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Similar to a pool ?Similar to a pool ?
H tHeat
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Olympic Pool ExampleOlympic Pool Example
Water Area : 165 ft x 70 ft, 11550 ft²Water Temperature 77º FpAir Temp and RH 79º F - 50%Dew Point 58º FDew Point 58º FActivity Factor 1.0Evaporation Rate 490 lb/hHeat Loss due to 510 000 bt /hevaporation 510,000 btu/h
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Olympic Pool ExampleOlympic Pool Example
Water Area : 165 ft x 70 ft, 11550 ft²Water Temperature 77º F 77º FpAir Temp and RH 79º F - 50% 82º F – 50%D P i t 8º 62º FDew Point 58º F 62º FActivity Factor 1.0 1.0Evaporation Rate 490 lb/h 425 lb/hHeat Loss due toHeat Loss due to evaporation 510,000 btu/h 450,000 btu/h
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Energy Consideration:Energy Consideration:
Higher Air TemperaturesHigher Air Temperatures
R d tiReduce evaporation
Rule of Thumb:Air 2ºF warmer than water
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C d i C lCondensation Control
1) Indoor surface temperature control
Remember: 62 ºF DP
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Expensive WindowsExpensive Windows…….aren’t the answer.
• 85°F Space• -10°F Outdoors• A TRIPLE pane
window has a 57 °F inner surfaceinner surface temperature.
• A double pane pwindow has a 45 °F inner surface t t
Room dew point = 62 ºFtemperature.
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C d i C lCondensation Control1) Inside surface temperature control
2) Moisture migration prevention) g p
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High Temperature – High Vapor Pressure
Heat Migration
Vapor Migration
Low Temperature – Low Vapor Pressure
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Hi h LowHighPressure
LowPressure
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HighLow
ΔP > 10” WC!!
HighPressure
LowPressure
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Areas of Condensation ControlAreas of Condensation Control
• Room dew point temperature control
• ?p
• Inside surface t t t l
• ?temperature control
• Prevention of • ?moisture migration through building
• ?g g
materials
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Areas of Condensation ControlAreas of Condensation Control
• Room dew point temperature control
• Mechanical Dehumidifierp
• Inside surface t t t l
Dehumidifier
temperature control
• Prevention of moisture migration through building g gmaterials
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Areas of Condensation ControlAreas of Condensation Control
• Room dew point temperature control
• Mechanical Dehumidifierp
• Inside surface t t t l
Dehumidifier• Duct layout
temperature control
• Prevention of moisture migration through building g gmaterials
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Areas of Condensation ControlAreas of Condensation Control
• Room dew point temperature control
• Mechanical Dehumidifierp
• Inside surface t t t l
Dehumidifier• Duct layout
temperature control
• Prevention of • Building Designmoisture migration through building
• Building Design
g gmaterials
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“If There is a Pile of Manure in a Space. Do Not Try to Remove the Odor by Ventilation. Remove the Pile of Manure”
Pettenkofer (1858)
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Pool water quality isPool water quality is the single biggestthe single biggest
IAQ problem and itIAQ problem and it impacts theimpacts the
mechanical systemsmechanical systems
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Cause Effect
• Under Chlorination • Combined Chlorines
• High pH level or(foul odor)S l f i• High pH level or
high total alkalinityL H l l
• Scale forming
C i• Low pH level or low total alkalinity
• Corrosion
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Corrosion & the IAQ problem:Corrosion & the IAQ problem:
Off-gassed gchloramines have a
strong attraction to the i b h idiairborne humidity.
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Corrosion & the IAQ problem:Corrosion & the IAQ problem:
Chloramines = Corrosive Condensate
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Addressing the IAQ problem:Addressing the IAQ problem:
Ultraviolet LightUltraviolet LightR d / li i tReduces/eliminates
chloramines!chloramines!
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Addressing the IAQ problem:Addressing the IAQ problem:
Get Air to the
breathing zone!
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Addressing the IAQ problem:Addressing the IAQ problem:
O d Ai Outdoor Air
Exhaust Air Exhaust Air
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O d AiOutdoor AirS d d 62 2004Per Standard 62-2004:
- 0.48 CFM per ft2 of pool and (wet) deck area or-7.5 CFM per spectatorAdd S OA CFMAdd Spectator OA CFM to baseline.
Water parks: Double the OA!
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Exhaust Air
Per Chapter 4 Applications:4 Applications:0.05 to 0.15” WC negative pressure.
R le of th mb: 110% of OARule of thumb: 110% of OA
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Heat recoveryHeat recovery
ΔT = ~ 100 ºF
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Th A f Ai Di ib iThe Art of Air Distribution
Air changes per ASHRAE4 6 h i i• 4 – 6 per hour in a natatorium
• 6 – 8 per hour in a spectator area• 8 per hour (occupied) in a water parkSpecify CFM needed to satisfy this p y y
requirement.
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Th A f Ai Di ib iThe Art of Air Distribution• Supply air to breathing zone!
S l i t h d ti• Supply air to where condensation is predictable
• Exterior windows & Doors.• Return location must complement• Return location must complement
supply duct layout.
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Th A f D D iThe Art of Duct DesignDuct Materials
• Galvanized – Aluminum – Fabric
• Avoid Stainless Steel!
Ensure proper throw and direction from all diffuserso a d use s
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#1 HVAC Design issue#1 HVAC Design issue
Get Air to the
breathing zone!breathing zone!
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Air delivered to the breathing zone?
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Air delivered to the breathing zone?
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DX Coil & Energy Recovery gy yLH:P lPool
Evaporation50%
.Moisture .Air off
Evaporator
Removed
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Vapor Compression CyclePSIA
Condensation
EvaporationEvaporation
TH = LH + SH
BTU/lb
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Vapor Compression CyclePSIA Latent
Condensation
EvaporationEvaporation
TH HC
BTU/lb
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Vapor Compression CyclePSIA LatentSensible + HC
Condensation
EvaporationEvaporation
TH HC
BTU/lb
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Mechanical Room as Return AirMechanical Room as Return Air Plenum
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Locker Room as Return AirLocker Room as Return Air Plenum
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Perhaps a pgood idea not t h thito have things
above the bove epool that need
iservice….
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….. stick with approved electrical devices…..
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