1. GEA Denco Close Control Climate control with the best in precision
Where just being precise is not precise enough
Air Treatment / GEA Denco Ltd.

2. Close Control products
GEA Denco Close Control - 11/08

3. Close Control Air Conditioning Product Range
Precise control of temperature & humidity
Modern design
New Microprocessor controller
Various air flow configurations and cooling media
Extensive options list
T-Range 9 capacities 3 – 84 kW
E-Range 20 capacities 22 – 120 kW
Heat Rejection Range
Condensers 7 – 75 kW
Condensing Units 4 – 38 kW
Dry Coolers 32 – 75 kW
GEA Denco Close Control - 11/08

4. Other GEA Denco Products
A special range of products has been designed for specific sectors
IP-Range: Full function, fully packaged for in room telecom applications 9 – 36 kW capacities
EP-Range: Externally packaged weatherproof telecoms units, 5 – 21 kW capacities with a RP internal room mounting version available
TW-Range: Full function T Range fully weatherproof for external telecoms
HS-Range: High static, specifically for clean room applications
GEA Denco Close Control - 11/08

5. LECUs in full cooling mode LECUs in recirculation mode
Denco – Officecool
The adaptable air conditioning system for the modern workplace
Ease of reconfiguration to new layouts
Individual control for users
Effective operation
Quiet conditioned air delivery
Raised floor void distribution for natural convection
LECUs in full cooling mode
LECUs in heating mode
LECUs in recirculation mode
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6. Officecool
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7. Zone Unit LECU Officecool 250mm - 300mm
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8. Raised Access Floors
As the Access Floor is a major part of the system, it must form part of the design.
The designers must ensure that
The access floor pedestals, structural stringers and panels integrate with the underfloor system’s Fan Tiles (LECUs).
The fire and air barriers under the floor meet requirements.
The sub-floor is sealed against air leakage.
GEA Denco Close Control - 11/08

9. Zone Units Schematic airflow diagram Officecool Zone Units
Officecool - Down flow, Top return
Officecool - Down flow, Bottom return
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10. Top return, Bottom discharge
Denco Zone Unit
Available in 6 models, 1, 2 & 3 fan modules
Top return / Bottom discharge, Bottom return / Bottom discharge
Chilled water or direct expansion cooling, air or water
LPHW, heatpump or electric heating
Proportional control humidification
655
10 kW
1255
20 kW
1847
30 kW
Top return, Bottom discharge
GEA Denco Close Control - 11/08

11. Fan Tiles ─ LECUS* Flexible Office LECU
*local environmental control units
GEA Denco Close Control - 11/08

12. Fan Tiles ─ LECUS* *local environmental control units
GEA Denco Close Control - 11/08

13. Fan Tiles ─ LECUS* Top return, Bottom discharge
*local environmental control units
GEA Denco Close Control - 11/08

14. Fan Tiles ─ LECUS* Bottom return, Bottom discharge
*local environmental control units
GEA Denco Close Control - 11/08

15. Fan Tiles ─ LECUS* Micro climate Open plan office layout
Fresh air
Micro climate
Exhaust air
Filter
Zone Unit
Cooling
Heating
Hum
Condi-tioned
air
Raised floor
Hum Water supply (optional)
LEC
LEC
Heating water (optional)
Cooling medium
Electrical supply
Electrical supplies
Drains
*local environmental control units
GEA Denco Close Control - 11/08

16. Heavy duty plastic lined panels
Zone Units
Section through Downflow
Heavy duty plastic lined panels
Large EC fan with flexible connection and anti-vibration mounts
Cooling / heating coils
Static regain plenum
GEA Denco Close Control - 11/08

17. GEA Denco Zone Unit Inverter Driven Fans
All units fitted with state of the art “Intelligent”
Inverter Driven fans which are up to 40% more efficient than standard direct driven fans
Benefits
The fan software detects the power drawn by the fan and can relate this to the known fan speed. This gives a known point on the fan curve and so we are able to control the performance of the fan to suit our exact requirements.
Control on constant air volume linked to return air temperature
maximum and minimum speed setting available via 0-10 V signal
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18. Zone Units
"Idle" Operating Point
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19. Zone Units
"Boost" Operating Point
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20. Independent controller
Fan Tiles ─ LECUS*
Section through fan tile
Supply air 20 °C
Supply air (20C)
Supply air (17C)
Supply air (14 °C min)
Return air 23C
Return air 24 °C
Return air 21 °C
Independent controller
Return air sensor
Heater (opt)
Damper
Floor void sensor
*local environmental control units
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21. Zone Unit & LECU* noise levels
Quiet
Zone units
typically sub - NR38 at 1 m in room
LECU
Fanspeed
Air vol (m³/s)
NR at 1 m 1
0.084 18 2
0.11 25 3
0.14 31 4
0.16 37 5
0.21 45
*local environmental control units
GEA Denco Close Control - 11/08

22. Features and Benefits
Flexibility IN DESIGN You don’t want the layout of your office to be determined by the layout of the existing air-conditioning system.
Flexibility IN USAGE You will save 70% when reconfiguring an office using an OfficeCool System, compared with a Ceiling Mounted 4 pipe fan coil system.
GEA Denco Close Control - 11/08

23. Features and Benefits Typical Flexible Office layout
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24. Features and Benefits Typical Flexible Office layout
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25. 1. Manual adjustment on LECU 2. Adjustment from BMS or intranet
Features and Benefits
Typical Officecool CONTROL
Options
1. Manual adjustment on LECU
2. Adjustment from BMS or intranet
GEA Denco Close Control - 11/08

26. GEA Denco – Compressed Air Dryers
50 years experience
Range 25 – 150 m³/min capacity
Newly developed MN Range
Wide portfolio of associated products
GEA Denco Close Control - 11/08

27. Requirements
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28. Requirements Equipment cooling High internal loads 500 – 1500 W / m²
Sound level subordinated priority
100% availability redundant units (standby)
Low fresh air rate low heat request < 5% / a
All-season operation
Small part loads
GEA Denco Close Control - 11/08

29. Requirements Air requirements
Narrow tolerances +/- < 1 °C, +/- 5% RH
Humidity control
high sensible cooling capacity
high leaving air temperature approx. 12 °C – 14 °C
large heat exchanger surfaces
High air volume flow
High quality air filter
GEA Denco Close Control - 11/08

30. Unit assembly
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31. Unit Assembly Standard shipment T/E-Line Controller Switch cabinet
Filter
Heat exchanger
Electric heating
Humidifier
Fan
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32. Unit Assembly T/E-Line Cooling capacity of 3 – 90 kW
Refrigerant R407C standard
Optional R410A and R134a possible
System components in shipment
Condensor
Chiller
Condensing units
Comprehensive accessories
Different versions for duct connections
Hydraulic modules
Modified fans, compressors
Water detection
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33. Routing of Air Flow – Upflow
server
intermediate ceiling
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34. Routing of Air Flow – Upflow
server
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35. Routing of Air Flow – Downflow
server
intermediate raised floor
24 °C 45% RH
Room condition at equipment height, breathing level or 2 m above floor
22 °C 50% RH
16 °C 70% RH
preferred min. void 300 mm
GEA Denco Close Control - 11/08

36. Energy Efficiency
 With a low pressure plenum (5-10 Pa) and efficient EC variable fan operation the system can around 20% more efficient than traditional VAV systems.
 Night time cooling can be used to achieve energy savings and reduced CO2 emissions.
GEA Denco Close Control - 11/08

37. Fresh air free cooling version
Modulating damper
Front return grille
Exhaust air out
Free cooling mode with ambients 2 °C below room set point
Ambient air in
Zone unit
Damper modulates to provide required conditions
Full recirculation with no free cooling at higher ambients
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38. Unit variants
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39. Unit variants Classic version for containers server room outside
Variants of series:
TW Range T wheather-proof
EP Range (externally package) low-budget-version
GEA Denco Close Control - 11/08

40. Unit Variants Packaged indoor mounting server room outside Variants:
T IP Range (refrigeration circuit in unit)
RP Range (room packaged) low-budget-version
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41. Unit Variants Reverse supply & return server room indoor Variant:
T Range with optional Rear Air Return and Supply
GEA Denco Close Control - 11/08

42. Unit Variants Classic version for rooms without a floor void
server room
Variants of series:
T Range
E Range
HS Range (laboratory/clean rooms)
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43. Refrigeration versions
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44. Cooling Versions Air-cooled A-version
outside unit refrigerant-condenser
precision air conditioner indoor mounted
application range server room
server
refrigeration circuit
refrigerant
heat exchanger
GEA Denco Close Control - 11/08

45. Cooling Versions Air-cooled X-version outside unit condenser unit
precision air conditioner indoor mounted
application range server room
server
refrigerant
refrigeration circuit
heat exchanger
GEA Denco Close Control - 11/08

46. precision air conditioner indoor mounted application range server room
Cooling Versions
Chilled water C-version
outside unit Chiller
precision air conditioner indoor mounted
application range server room
server
chilled water
refrigeration circuit
heat exchanger
GEA Denco Close Control - 11/08

47. Cooling Versions Watercooled W-version outdoor unit air-water-cooler
precision air conditioner indoor mounted
application range server room
server
refrigeration circuit
water
heat exchanger
GEA Denco Close Control - 11/08

48. Cooling Versions Energy Saving Ambicool F-Version
outdoor unit air-water-cooler
precision air conditioner indoor mounted
application range server room
refrigeration circuit
server
summer
water
winter (< +11 °C)
2 heat exchangers
GEA Denco Close Control - 11/08

49. Cooling Versions Energy Saving Combicool D-version out door unit
precision air conditioner indoor mounted
application range server room
refrigeration by A, X, W, (C) -version
server
external chilled water
2 heat exchangers
GEA Denco Close Control - 11/08