Liebert DSE High efficiency thermal management

1. Liebert DSE High efficiency thermal management Liebert DSE 250 *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. No water usage, No water treatment No outside air contamination No dampers and louvers to maintain Instant, automatic economizer changeover Liebert DSE – Over 3,500 units installed Globally Reliable, Low-Maintenance Operation Condenser: 3.9 kW Refrigerant Pumps: 1.2 kW Condenser RefrigerantPump PUE as low as 1.05 Full Economizer Mode Evaporator Electronic expansion valve Compressor Evaporator: 3.2 kW 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 • DSE Small • 50 kW • 7,000 CFM • 77”x35”x76” (LxDxH) New Model: DA250 DA125 DA150 DA165 DA050 DA080 DA085 DSE Large • 125-165 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 DSE Medium • 80-85 kW • Up to 10,400 CFM • 100”x35”x76” (LxDxH) • Downflow and upflow

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) Wasted Fan kW 90°F 95°F Balanced “Sweet Spot” 65°F High Efficiency, High Return Air 65°F Source: Upsite Technologies *Additional Notes

9. 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 (Perimeter) • No indoor footprint usage • No rooftop loading • Fast, simple installation • Large overall outdoor footprint • Airflow recirculation for multi-story applications • 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 *Additional Notes

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

13. Liebert DSE 250 Design Service Side Data Center 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 RefrigerantPump Return Air Evaporator Compressor Air Capacity Tin, Pin Tout, Pout Refrigerant Capacity Supply Air

15. Application Comparison – split vs packaged • Packaged DSE 400 (Perimeter) • No indoor footprint usage • No rooftop loading • Fast, simple installation • Large overall outdoor footprint • Airflow recirculation for multi-story applications • 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 *Additional Notes

16. Liebert DSE 060 Packaged Unit Low Leakage Weatherized Panels Microchannel Condenser Perimeter • Top return, bottom supply • Fans discharge directly onto slab or into raised floor • No additional curbs or duct work required Applications: RETURN SUPPLY • 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