Download - Humidification in Hospitals

Humidification in HospitalsHumidification in Hospitals

Nebraska Society of Healthcare Engineers

Presented ByPresented By


Eric G. Sherman, P.E., LEED AP, CxA

Jonathon Spreeman, District Sales Engineer

Luke VanCamp, Sales Engineer

http://www.hughesmachinery.com/default.aspx

AgendaAgendaHumidification of Hospitals

Healthcare Humidification Code

Hospital Dehumidification

Strategy

Comparison

Case Studies

Hospital Humidification

Strategy

Comparison

Questions…..


Healthcare Humidification CodeHealthcare Humidification CodeEric ShermanEric Sherman


AIA / FGI Guidelines for Healthcare Construction

NFPA

The Never Ending Debate


Healthcare Humidification CodeHealthcare Humidification Code

Hospital DehumidificationHospital DehumidificationJonathon SpreemanJonathon Spreeman


Dehumidification StrategiesDehumidification Strategies

Common System Types

• Traditional Cooling & Reheat

• Split Dehumidification Unit

– Dedicated OA Coil

– Dedicated RA Coil

• Series Desiccant Wheel

• Heat Generated Desiccant


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


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


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


Application ExamplesApplication Examples


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



Methods of HumidificationMethods of Humidification

• Direct Steam Injection• Evaporative Pan • Water Spray


Direct Steam InjectionDirect Steam Injection


Humidification GridHumidification Grid


Unfired Steam GeneratorsUnfired Steam Generators

Series RB

Series RB-H Series RB-V


Steam-to-Steam HumidifierSteam-to-Steam Humidifier


Humidification Grid with Atmospheric Humidification Grid with Atmospheric Steam GeneratorSteam Generator


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


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


Electrode Type HumidifierElectrode Type Humidifier


Water DependenciesWater Dependencies

• Conductivity (200-400 (umho)• Hardness (133-266 PPM)• Hardness (7.7-15.5 Grains/Gallon)


Water ImpuritiesWater Impurities


Resistive Heating Element TypeResistive Heating Element Type


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


NozzleNozzle

Thank you for your time!Thank you for your time!

Questions please?Questions please?
