1. Munters DH Systems for Hospital Applications
Chris Hennessey Regional Sales Manager, Munters October 8, 2015
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2. HVAC Challenges – Health Care
Need to restrict air movement in and between specific departments
Specific requirements for ventilation to dilute and remove contamination
Different Temperature and Humidity Requirements for Various Areas
Design Sophistication to Permit Accurate Control of Environmental Conditions
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3. HVAC Challenges – Health Care
Temp. RH
Pressure
O/A A.C.
Total A.C.
Operating Room
62°-80°
45-55 P 5 25
Intensive Care
70°-75°
30-60 * 2 6
Nursery
75°-80° 12
X-Ray 3 15
General Lab
72°-76° N
Administration
Special Treatment
Rheumatoid Arthritis
90° 35
Burn Patients 95
Open Heart Surgery
55°-65° 50
Source: ASHRAE Handbook HVAC Applications
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4. Points to Consider
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5. Dehumidification Methods
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6. Desiccant Psychrometrics
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9. Beware of Part Load Performance!!!
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10. Cromer Cycle in Surgical Suite – You Probably Want to Add Heat
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12. Ventilation air must be dehumidified to room dewpoint set-point
Surgical Rooms
Surgeons are insisting on cooler and subsequently drier working conditions
Ventilation air must be dehumidified to room dewpoint set-point
All air must be conditioned for internal loads
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13. Hospitals Reasons for Lower Temperatures Lower Humidity
Surgeries (Cardio & Ortho)
Patient metabolism slows at lower temperatures and some studies show speedier recovery
Comfort
Surgical teams are required to wear multiple layers of protective clothing (they are hot)
Teams are often engaged in lengthy and/or very physical procedures
Surface Condensation
Lens fogging, tools, implants
Corrosion
Drips
Lower Humidity
Licensing requirements
30-60%RH
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14. Conventional Custom Unit
Utilizes chiller plant to minimize low temperature chiller tonnage
Requires large reheat from 42˚F to at least 57˚F
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15. Desiccant Pre-treat Unit
Can be configured to work with existing installations
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16. Energy Savings
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17. Desiccant Approach Advantages
Low Temperature Chiller Not Required
Energy Savings
Less Reheat
Less Sensible Cooling (Just to get to where water can be removed)
Minimized Condensation Issues
Chilled Water Supply Lines not as Cold
Supply Air Duct not as Cold
Conveyed Air is Not Saturated
Humidity and Temperature Control is Decoupled — Supply Air is Not Over-Cooled to Meet Humidity Needs!
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18. Latest Desiccant Technology
What Option is Available to Increase Desiccant Cycle Efficiency……………
Can the Desiccant Air Leaving Enthalpy nearly Equal the Entering??
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19. Closed loop purge system
What is PowerPurge?
Closed loop purge system
Provides a cooling purge to reduce post cooling needs and improve moisture removal
Provides a heating purge that recycles heat to reduce reactivation energy requirements
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20. PowerPurge zones are small
How does it work?
PowerPurge zones are small
Seals separate process, reactivation and purge airstreams
Small fan recirculates air
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21. WHAT IF REACTIVATION HEAT WAS FREE???
Latest Desiccant Technology
Considering that Desiccant Dehumidification Does Not Lower Enthalpy…………Why Would it Ever Make Sense for Higher Dew-Point Applications? For example: Patient Rooms, Labs, Offices, Common Areas?
WHAT IF REACTIVATION HEAT WAS FREE???
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22. DryCool –Technology Humidity Control Unit (HCU)
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23. Heat Exchangers
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24. Benefits to Hospitals Save Time and Increase Revenue Equipment Quality
Reliability, maintenance, serviceability
Sensible ONLY Coils and Drier Supply Air
Coil and duct cleaning
Surgery Schedule Interference
Surgeries are money makers downtime is unacceptable
Quick and easy retrofit projects
Delay major renovations
System improvements that delay major projects
Energy
Chiller efficiency
Utilize summer excess steam
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25. As “consultants,” Munters asks the questions first:
Munters: Possible System Solutions
As “consultants,” Munters asks the questions first:
What are the concerns now?
Is this a new building, expansion, or retrofit?
What systems have been used before?
Does the facility have a source of chilled water or steam?
What is the surgery room schedule?
What types of surgeries are performed?
Who or what is driving the need for room conditions?
What OA percentage is needed in the room?
Are there any special configuration or constraints that are of concern?
What conditions (dew point) is needed in the space?
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26. 40-45°F dew point and OA below that can be used:
Not to simplify, but the last question drives possible solutions
40-45°F dew point and OA below that can be used:
HCU
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27. Preconfigured design – for the most part in 1,000 CFM to 16,000 CFM
HCU – features benefits / limitations
Preconfigured design – for the most part in 1,000 CFM to 16,000 CFM
Packaged system for smaller surgical buildings where CW or STM not available
Able to deliver 40-45°F dew point versus CW air handler
First cost, most attractive due to preconfigured solutions
DH capacity via desiccant limited as ambient drops to 45°F
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28. DP < 45°F, larger CFM, customization
DDS
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29. More customization over the HCU
DDS – features / benefits / limitations
More customization over the HCU
Lower dew point deliverable over HCU for entire operating hours
Below 20°F – 25°F dew point, casing might not be suitable
Not fully custom in configuration
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30. ICA: DP < 20°F or lower, retrofit for pretreating OA
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31. Packaged refrigeration Wide array or components can be included
When back of the napkin drives solution
VA custom
Packaged refrigeration
Wide array or components can be included
Can be configured for OA and full ventilation load
Custom controls
Service vestibules if needed
Wide array of dew point capability – although, extreme dewpoints best solved with ICA technology
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32. Questions
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