Server Room Heat Recovery and Free Cooling with CO 2 and Propane Varme Auxillary fra heating jordslanger Køling Compressor via mekanisk operation køling i Køling Auxillary via cooling jordslanger (25% Køling Heat recovery via varmegenvinding Køling Free cooling via Hybridkøling Energy Outdoor temperature ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 1
Project Organisation Funding The Danish Energy Association Partners Danish Technological Institute Carrier Refrigeration Denmark Danish Technical University FlexCoil (subsidiary of Evapco) Alfa Laval Plant Host and Investor EnergiMidt ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 2
The Office Building of EnergiMidt ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 3
View of the hall ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 4
Need to have Building Heating system Hot tap water preparation Ventilation system Canteen kitchen refrigeration system Server room cooling system Server room cooling back up Low operation costs ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 5
Nice to have Low energy building concept Natural refrigerants Heat recovery Free cooling Natural and mechanical ventilation system PV panels ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 6
Capacities Server room Heat Load Propane/ CO 2 system Glycol chiller Heat Recovery Coil Canteen kitchen refrigeration Heat Pump Heating Heat Pump Hot Tap Water 150 kw 100 kw 100 kw 100 kw 20 kw 120 kw 20 kw ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 7
Screen dump from BMS system ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 8
Server room cooling modes n Low ambient temperature CO 2 free cooling ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 9
Server room cooling modes n Medium ambient temperature n Free cooling and compressors both active ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 10
Server room cooling modes n At high ambient temperatures only compressors are active ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 11
System integration ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 12
Heat recovery loop ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 13
Heat pumps ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 14
Kitchen refrigeration system ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 15
Server room racks and ducts ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 16
CO 2 free cooling unit ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 17
Challenges Complexity in commissioning Balancing load/ need Pump failures in CO 2 system due to wrong setting of minimum speed Benefits Low operation costs Long term solution Minimised Carbon Footprint ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 18
What is the cost? Natural refrigerants Heat recovery Free cooling All has been accomplished with a minimum internal interest rate of 8 % ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 19
Good interest rate in spite of Installations are 50 % more expensive than cheapest HFC solution (not equivalent) Installations are 20 % more expensive than best HFC alternative (but not a match) Due to Larger heat exchangers and EC fans Increased free cooling potential Advanced controls Integration of systems Natural refrigerants ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 20
Important factors Integration of heating and cooling needs Involvement at an early stage of the building planning process End-user focus at total operation costs especially energy consumption How do we improve? ATMOsphere2011 DTI Refrigeration and Heat Pumps, Christian Heerup 21