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…..

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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

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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 systemCool & reheat (1 coil)Cool & reheat (2 coils)

Upstream coilDownstream coil

Split dehumidification unitOA coilRA coil

Trane CDQHeat 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 42.54.0 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 °F39 °F

45 °F34 °F

45 °F

45 °F*High Temperature Preheat

Based on 15,000 cfm

System ComparisonSystem Comparison

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Cool & reheat (1 coil)Cool & reheat (2 coils)

Upstream coilDownstream coil

Split dehumidification unitOA coilRA coil

Trane CDQHeat 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'

WAT

ER V

APO

R

50F49F DPT

55F43F DPT

80F60F DPT

75F63F 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

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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

o f M

o ist

u re/

lb. D

ry 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?

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