1. Munters DH Systems for Freezer Applications Presented by: Mike Sadosky
February 18, 2010

2. Freezer Terminology Process Freezer
Any freezer where actual freezing of a product
takes place.
Spiral Freezer (0°f to -55°f)
Plate/Blast Freezer (-45°f)
Storage/Holding Freezer
Any freezer where frozen product is stored prior to distribution.
Storage Freezer (30°f to -25°f)

3. Condensation Control for Freezers
Extends defrost cycle, increases production
Eliminates icing on floor & conveyor
Reduces ice buildup on evaporator coils, less maintenance costs
Eliminates ice on downstream weighing machinery

4. Signs of Condensation Problems
Ice on coils causes defrost
Ice on product
Ice forms on inlet and outlet of freezers

5. Typical Process Freezer
Ice Buildup on evaporator coils
Packaging Area
(Upper Level)
Product Flow
Packaging Area
Moisture
Leakage
(Lower Level)
Product Flow
Suction Side Of Freezer

6. Cooling Coil Performance
44 gr/lb
70°F
56 gr/lb

7. Cooling Coil Performance
FOG
FROST
25°F
19 gr/lb
70°F
56 gr/lb

8. Psychrometric Plot
DESIGN CONDITIONS IN PROCESS FREEZER APPLICATIONS WITHOUT MUNTERS DH 40
140 35
120 30
PACKAGING AREA
AT 45°-50°F
100
Enthalpy - Btu per Pound of Dry Air 25 80
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb) 20
Fog 60 15
Frost 40
Ice 10 20
-10
-10 10 20 30 40 50 60 70 80 90
100
110
Dry Bulb Temperature °F

9. Process Freezer with Desiccants
Psychrometric Plot
Process Freezer with Desiccants
DESIGN CONDITIONS IN
PROCESS FREEZER APPLICATIONS WITH DESICCANTS 40
140 35
120 30
PACKAGING AREA
AT F
100
Enthalpy - Btu per Pound of Dry Air 25 80
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb)
Humidity Ratio Grains of Moisture per Pound of Dry Air (gr/lb) 20 60 15 40 10 20
-10
-10 10 20 30 40 50 60 70 80 90
100
110
Dry Bulb Temperature °F
OPTIONAL POST-COOL
DEHUMIDIFY TO 1 GR/LB

10. Makeup Air System with Tunnels
Condition air at product entrance and exit to remove infiltration load

11. Wagner Pizza

12. Air System with Vestibule
Condition air at product entrance and exit to remove infiltration load

13. Winn-Dixie Ice Cream Plant
Issues:
Electronic Sensors In Carousel Freezer:
Coated w/ ice and required manual cleaning every two hours.
Freezer Maintained at -35°F
BEFORE
AFTER

14. The Munters Solution Eliminates infiltration load
Example: If you have a -25 spiral freezer and plant ambient conditions of 75 F DB at 60% RH. Freezer inlets are 2’ x 4’
Using gr/hr / 7000 = (CFM) * (4.5) * (delta gr/lb)
gr/hr / 7000 = (2,400 CFM) * (4.5) * (78.1 – 1.3)
Lb / hr = 118.5
Positive Pressure in the freezer aids in product load

15. Process Freezer Benefits
Reduction in defrost cycles in freezer
Reduction in ice on inlets and outlets of conveyors
More throughput
Coils working more efficiently
Able to stay in production

16. Notes Determine the infiltration load and product load
Product load is more difficult to control—once the moisture enters the freezer, it’s there.
Don’t promise “no defrost cycles”
Research customer experience. Do they have better performance during the winter? What are their expectations?

17. Condensation Control for Freezer Storage
Eliminates fog and condensation
Eliminates slippery floors
Improves worker safety
Prevents mold growth
Fewer mechanical and electrical failures

18. Freezer Storage Issues
Ice forms at all openings
To hold 40°F temperatures, coils must supply below freezing temperatures
Product drying is not allowed
Large infiltration load
USDA is currently considering ice that could fall on product (sealed or unsealed) to be an issue that needs to be addressed

19. Freezer Storage Solution
When Temperatures are between 28°F and 40°F
Do moisture load calculation
Keep room DP below coldest surface temp.
Example, if they are using 30°F ammonia to cool the space for a 40°F room, room must be kept below a 30°F DP
Look at recirculating air when possible (except during sanitation)
When Temperatures are below 27°F:
IceDry is a great solution.
Determine the cause of the moisture load. If it isn’t product, try to handle at the source.

20. IceDry Eliminate De-Icing Expenses and Downtime Increase Productivity
Prevent Slippery Floors
Improve Worker Safety
Eliminate Ice on Products and Packaging
Reduce Defrost Requirements and Costs
ICEDRY OPTIONS INCLUDE:
825 SCFM
TSP’s up to +/- 3” w.g.
Dew Points of °F or Less

22. Benefits Freezer Storage Freezer USDA compliance
Prevention of frost and ice on doors and coils
Removal of “latent” load on current temperature control equipment
Freezer
DH is installed inside the freezer and continues to dehumidify the air event when doors are shut
Provides < -40°F DP discharge

23. Nordic Chicken -10 Freezer
BEFORE
Sept. 28, 2006
AFTER
6 weeks after startup Dec.1, 2006
IceDry 1400 installed over main door to loading dock

24. Thank You
Munters can control condensation, frost, and ice build up in any/all freezers.
Utilize RSM and AE’s for application support.
Freezer Application Guide available on WebDH
Questions?