humidification in hospitals nebraska society of healthcare engineers
TRANSCRIPT
Humidification in HospitalsHumidification in Hospitals
Nebraska Society of Healthcare Engineers
Presented ByPresented By
Nebraska Society of Healthcare Engineers
Eric G. Sherman, P.E., LEED AP, CxA
Jonathon Spreeman, District Sales Engineer
Luke VanCamp, Sales Engineer
AgendaAgendaHumidification of Hospitals
Healthcare Humidification Code
Hospital Dehumidification
Strategy
Comparison
Case Studies
Hospital Humidification
Strategy
Comparison
Questions…..
Nebraska Society of Healthcare Engineers
Healthcare Humidification CodeHealthcare Humidification CodeEric ShermanEric Sherman
Nebraska Society of Healthcare Engineers
AIA / FGI Guidelines for Healthcare Construction
NFPA
The Never Ending Debate
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Healthcare Humidification CodeHealthcare Humidification Code
Hospital DehumidificationHospital DehumidificationJonathon SpreemanJonathon Spreeman
Nebraska Society of Healthcare Engineers
Dehumidification StrategiesDehumidification Strategies
Common System Types
• Traditional Cooling & Reheat
• Split Dehumidification Unit
– Dedicated OA Coil
– Dedicated RA Coil
• Series Desiccant Wheel
• Heat Generated Desiccant
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Basic CV system
Cool & reheat (1 coil)
Cool & reheat (2 coils)Upstream coilDownstream coil
Split dehumidification unitOA coilRA coil
Trane CDQ
Heat Regenerated Desiccant
70% 26.6 55.3 0
60% 40.0 47.0 12.0
60% 40.0 12.020.0 55.020.0 47.0
60% 28.0 024.0 42.5
4.0 55.3
52% 29.3 50.3 0
52% 44.0 55.3 * 24.0
Space% RH
Coolingtons
lvg coil°F
Reheat“tons”
CHW°F
45 °F
39 °F
45 °F
39 °F
45 °F34 °F
45 °F
45 °F
*High Temperature Preheat
Based on 15,000 cfm
System ComparisonSystem Comparison
Nebraska Society of Healthcare Engineers
Cool & reheat (1 coil)
Cool & reheat (2 coils)Upstream coilDownstream coil
Split dehumidification unitOA coilRA coil
Trane CDQ
Heat Regenerated Desiccant
$5.07 3000 $15,250 $300K
$4.53 3000 $13,590 $272K
$3.07 3000 $9,210 $184K
$2.53 3000 $7,590 $152K
$6.00 3000 $18,000 $360K
Oper $/hr @ design
AnnualOper Cost
Over 20
yearsCool Reheat
-11%
-39%
-50%
--
+18%
$0.058/kwh $0.78/therm
Annualhrs
Annual Oper Cost vs
System ComparisonSystem Comparison
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CA
OA
RA
SA
MAMA'
WA
TER
VA
PO
R
50F
49F DPT
55F
43F DPT
80F
60F DPT
75F
63F DPT
TRANE CDQ WHEEL
A “Series” Desiccant wheel used to improve the dehumidification ability of a cold coil
CONDENSATE
Application of Series Desiccant WheelApplication of Series Desiccant Wheel
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Application ExamplesApplication Examples
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Building Expansion (Existing Central Plant)
Good Samaritan Hospital Expansion
– 30,000 CFM Dedicated Surgery Unit
– Existing 42 Degree Chilled Water
– Leaving Unit: 60 Degree DB and 41 Degree DP
Building Expansion (Existing Central Plant)
Gothenburg Hospital Surgery Area
– 6,000 CFM Dedicated Surgery Unit
– DX condensing unit
– Leaving Unit: 57 Degree DB and 44 Degree DP
Hospital HumidificationHospital HumidificationLuke VanCampLuke VanCamp
Nebraska Society of Healthcare Engineers
Nebraska Society of Healthcare Engineers
Methods of HumidificationMethods of Humidification
• Direct Steam Injection• Evaporative Pan • Water Spray
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Direct Steam InjectionDirect Steam Injection
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Humidification GridHumidification Grid
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Unfired Steam GeneratorsUnfired Steam Generators
Series RB
Series RB-H Series RB-V
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Steam-to-Steam HumidifierSteam-to-Steam Humidifier
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Humidification Grid with Atmospheric Humidification Grid with Atmospheric Steam GeneratorSteam Generator
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Gas-Fired HumidifierGas-Fired Humidifier
• Will work on natural gas or Will work on natural gas or liquid propane gasliquid propane gas
• Includes models for both Includes models for both indoor and outdoor serviceindoor and outdoor service
• Provides steam production Provides steam production capacities up to 475 lbs/hrcapacities up to 475 lbs/hr
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Energy SavingsEnergy Savings
Electricity vs. Gas
Electricity @ $0.08 / kW
Gas @$0.53 / Therm
Based on 150 Lbs/hr Output
$6,600
$2,500
$0$1,000$2,000$3,000$4,000$5,000$6,000$7,000
Operating Cost
ElectricityGas
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Electrode Type HumidifierElectrode Type Humidifier
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Water DependenciesWater Dependencies
• Conductivity (200-400 (umho)• Hardness (133-266 PPM)• Hardness (7.7-15.5 Grains/Gallon)
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Water ImpuritiesWater Impurities
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Resistive Heating Element TypeResistive Heating Element Type
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Adiabatic HumidifiersAdiabatic Humidifiers
26 0 10 20 30 40 50 60 70 80 90
10
20
30
40
50
100 90 80 70 60 50 40 30
%RH
Gra
i ns
of M
oist
ure/
l b. D
r y A
ir
Wet
Bul
b F
20
30
40
50
Dry Bulb F
FOGGERSAVINGS
STEAM MIXING POINT
FOGGER MIXING POINT
RASA
OA
26
0 10 20 30 40 50 60 70 80 90
10
20
30
20
30
40
FOGGERSAVINGS
STEAM MIXING POINT
FOGGER MIXING POINT
OA
Spring/Fall Spring/Fall EconomizerEconomizer
1. O.A. Mixing2. Fogging3. Building Heat Gain
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NozzleNozzle
Thank you for your time!Thank you for your time!
Questions please?Questions please?
Nebraska Society of Healthcare Engineers