Presentation by Alan Beresford of EcoCooling on the Application of Evaporative Cooling in Data Centres and Server Rooms

1. EcoCooling The Application of Evaporative Cooling in Data Centres and Server Rooms Alan Beresford Managing Director

5. How a CREC works Data Rack Damper Constant flow and temperature Evaporative Cooling

6. How a CREC works Constant air flow` Controlled temperature and pressure EcoCooling CREC Fresh air input to system Exhaust air recycled Attemperation damper Evaporative cooling during hot periods Hot air exhausted to outside

7. How a CREC works

8. Sizing and Energy – 100kW Example A 100kW server room needs 8.4m 3 /s Use Q=mC p Δ T to calculate mass flow rate This is the server load Temperature rise through server

9. Sizing and Energy – 100kW Example CREC energy use is less than 10% of DX CREC energy use is 4.2 kW Fridge energy use is 50 kW A good DX system will achieve a COP of 2.0 A CREC uses 0.5 kW/m 3 s -1

10. Sizing and Energy – 100kW Example 218 tonnes carbon savings per year Annual Cost Saving of £32,000 CREC system will use 37,000 kWhrs/yr 24/7 operation is 8760 hours per year DX system will use 430,000 kWhrs/yr

11. Sizing and Energy – 100kW Example Not 10kW but 8.4m 3 /s This is the number of coolers required No redundancy, N+1 or 2N This is the flow rate of a CREC The is the design capacity Each grill is designed for .5m 3 /s 17 grills!

13. Temperature and Humidity Standards Temperature RH Server Fan Energy Condensation Equipment Failure Static Cooling Costs Tape Stability CAF Development 0% 50% 100% 0C 10C 20C 30C 40C

14. EcoCooler Performance Air off temperature will not exceed 23C in London 30C days are very rare Red line is ambient temperature Blue line is cooled air from EcoCooler In the North this will not exceed 20C

15. Temperature and Humidity Standards 0 o C 5 o C 10 o C 15 o C 20 o C 25 o C 30 o C 35 o C 40 o C 45 o C 50 o C 55 o C -5 o C 10% 20% 30% 40% 50% 60% 70% 80% Dry Bulb Temperature Relative Humidity EcoCooling is 100% temperature compliant and 99% RH compliant Close control is not required ASHRAE Class 1 is a good guide` Accepting this performance can reduce the cooling energy use by over 90% Manufacturer Specifications 10-35C 5-80%RH ASHRAE 2008 Class 1 Allowable 15-32C 16.5CDP 20-80%RH ASHRAE 2008 Class 1 18-27C 5.5-15CDP 60%RH CIBSE 19-23C 45-55%RH EcoCooling Capability

17. Control All control is directed through the CREC control panel whch can control up to six CREC’s

18. Control Selectable menu items and set point adjustment is by the push buttons and LED display

19. Control External and internal temperatures (with optional pressure) are constantly monitored CREC speed and cooling mode is controlled Fire alarm link disables CREC’s and enables refrigeration equipment and closes suppressant dampers

20. Control C1 C2 C3 C4 Mains Water Drain Drain Valve Initiate Cooling Mode Initiate water supply Drain Water Supply SP – 2C SP – 4C SP – 6C 5C Cooling Mode Disabled SP Water supply is automatically drained for frost protection Cooling mode is only enabled when necessary

21. Operational Advantages Ability to cope with very hot days Power Savings Simple Redundancy Simple Maintenance No F Gas Compliance Costs Low cost spare parts holding External Access for maintenance Increase in available power Carbon Savings No internal space needs