1. Liebert DSE High efficiency thermal management
*Additional Notes

2. DX Split Systems (CRAC Units)
APPLICATIONS
Perimeter or in gallery
Multiple heat rejection configurations
ADVANTAGES
Highly reliable
Modular build outs
Easy to deploy
No water, no outside air
CHALLENGES
Historically not as efficient as alternatives

3. Liebert DSE: High Efficiency DX Thermal Management
*Additional Notes

4. Liebert DSE – Over 3,500 units installed Globally
Cooling Mode
Outdoor Temp
Cooling PUE
Full Compressor 95
1.28
Partial EconoPhase 65
1.17
Full EconoPhase 45
1.09
Condenser: kW
Refrigerant Pumps: kW
Condenser
Refrigerant Pump
PUE as low as 1.05
Full Economizer Mode
Evaporator
Electronic expansion valve
Compressor
Reliable, Low-Maintenance Operation
Evaporator: kW
No water usage, No water treatment
No outside air contamination
No dampers and louvers to maintain
Instant, automatic economizer changeover
Compressor: 17 kW

5. Free-cooling Hours with Pumped Refrigerant Economization
Free Cooling Optimization Based on Temperature AND Load
Economization Hours
Economization Hours
95% Economization = Refrigerant Economizer with DX Backup

6. Overall DSE Product line
New Model:
DA250
DA125
DA150
DA165
DA050
DA080
DA085
DSE Small
50 kW
7,000 CFM
77”x35”x76” (LxDxH)
DSE Medium
80-85 kW
Up to 10,400 CFM
100”x35”x76” (LxDxH)
Downflow and upflow
DSE Large kW
Up to 24,000 CFM
144”x47”x76” (LxDxH)
DSE xLarge
250 kW
Up to 40,000 CFM
120”x84”x135” (LxDxH)
Under-floor or front discharge

7. Needs driving DSE 250 Design
1) Reduced Unit Count
Recent movement to larger and larger suites
Desire for fewer units and less complexity
2) Non-Raised Floor Designs (Fan Wall)
Colo pursuing large hyperscale tenants
No raised floor = reduced cost
3) High Density Data Center Suites
Trend toward designs for up to 300 W/ft2
Wall space becomes critical limiting factor in these high density deployments
Additional airflow to manage ∆T
47”
88”
84”
120”
*Additional Notes

8. Key consideration for large data centers: Delta T
Data Center Temperatures: Cabinet vs. Cooling Unit ∆T
Difficult to obtain perfect separation between hot and cold air
Cooling unit ∆T and Server ∆T do not always match (server ∆T is always higher)
Peak Power Usage and ∆T: DSE 165
Cooling Unit ∆T
Capacity (kW)
Indoor Fan kW
Total Peak kW
Peak Cooling PUE 20
178
21.9 74
1.41 22
190
14.2 66
1.35 25
199
12.7 64
1.32 28
11.2 63 32
193
7.14 59
1.30 35
188
5.37 57
Wasted Fan kW
90°F
95°F
65°F
Balanced “Sweet Spot”
High Efficiency, High Return Air
65°F
Source: Upsite Technologies
*Additional Notes

9. Rating Pt: 74°F Supply - 99°F Return at 110°F ambient
DSE 250 Specifications
Performance
250 kW at 33,500 CFM
Rating Pt: 74°F Supply - 99°F Return at 110°F ambient
Option for 40,000 CFM for 22 degree dT
Packaging
Separate fan and coil sections
Split system with ability to place units side by side
All service from back (non-data center side)
47”
88”
84”
120”
*Additional Notes

10. What cooling density can we support?
Increased Load in Same Footprint = Higher Density Perimeter units can support high rack densities with proper containment Overall room cooling density (W/ft2) is limited by use of wall space (and unit length) Example – 3.6 MW Room, 250 W/ft2, N+2 Cooling
Traditional Perimeter CRAC
Liebert DSE 250 “Fan Array”
*Additional Notes

11. Application Comparison – split vs packaged
Packaged DSE 400 (Rooftop)
No indoor footprint usage
Fast outdoor installation
Requires duct work
Larger rooftop load may require additional structural support
Split DSE 250 (Perimeter or Gallery)
No duct work
Lower rooftop loading
Reduced overall footprint on ground floor
Zero leakage
Uses indoor footprint
Requires refrigerant piping
Packaged DSE 400 (Perimeter)
No indoor footprint usage
No rooftop loading
Fast, simple installation
Large overall outdoor footprint
Airflow recirculation for multi- story applications
*Additional Notes

12. DSE 250 Layout Options Front Discharge Non-Raise Floor
Fully rear-serviceable
No side clearance required
Max 750 ft/min velocity at first rack
Under-Floor Discharge (Gallery)
Fully rear-serviceable
No side clearance required
Full airflow with 36” floor and up
Under-Floor Discharge (Perimeter)
Fully rear-serviceable
No side clearance required
Full airflow with 36” floor and up
*Additional Notes

13. Data Center Side Service Side
Liebert DSE 250 Design
Data Center Side
Service Side
Direct Drive
Supply Fans
(2 or 3 per unit)
Top Piping Connections
Electronic Expansion Valves
No Side Access Required
Evaporator Slab Coil with Face Filters
15-Degree Fixed Louvers
Tandem Digital Scroll Compressors
Condensate Pump

14. Capacity Measurement Accuracy
Total Heat Rejection
Condenser
Refrigerant Pump
Return Air
Evaporator
Compressor
Air
Capacity
Tin, Pin
Tout, Pout
Refrigerant Capacity
Supply Air

15. Application Comparison – split vs packaged
Packaged DSE 400 (Rooftop)
No indoor footprint usage
Fast outdoor installation
Requires duct work
Larger rooftop load may require additional structural support
Split DSE 250 (Perimeter or Gallery)
No duct work
Lower rooftop loading
Reduced overall footprint on ground floor
Zero leakage
Uses indoor footprint
Requires refrigerant piping
Packaged DSE 400 (Perimeter)
No indoor footprint usage
No rooftop loading
Fast, simple installation
Large overall outdoor footprint
Airflow recirculation for multi- story applications
*Additional Notes

16. Liebert DSE 060 Packaged Unit
Low Leakage Weatherized Panels
Microchannel Condenser
RETURN
SUPPLY
Applications:
Perimeter
Top return, bottom supply
Fans discharge directly onto slab or into raised floor
No additional curbs or duct work required
Rooftop
Bottom return, bottom supply
Supply or return in service area
Curb or duct collar connection
Compressor Cabinet
Pumped Refrigerant Economizer
Fan Access

17. Lab Overview and DSE 250 Technical Review
*Additional Notes