I Indirect Dynamic Free Cooling Hybrid Free Cooling system with Indirect Free Cooling and dynamic control. The system cools precisely and dynamically in line with the occurring heat load, and enables extended Free Cooling mode. 15, 25, 37 Indirect Free Cooling Outside air is used indirectly for air conditioning through heat transfer 15, 17, 20, 21, 22, 23, 24, 25, 26, 45, 52, 54, 55, 72, 86, 97 ISO container Large standardized shipping container 82, 92 modularity / modular Enables something whole (consisting of modules, components, elements, parts or assemblies) to be taken apart or put together 9, 26, 54, 56, 57, 58, 60, 70, 72, 73, 80, 83, 88, 95 MSR peripheral Connection to measurement, open-loop and closed-loop control systems 101 O operational reliability Safe, reliable and fault-free operation 7, 36, 48, 56, 97, 106 L P latency Time interval in telecommunications by which an event is delayed 70 liquid-to-liquid heat exchanger Heat exchanger for transferring heat between two liquids without mixing them 77 M maximum size Device-specific maximization of components for maximum efficiency 89 microchannel technology Specially designed aluminum heat exchanger with numerous small channels around 1 mm in diameter. The results are low weight, low refrigerant quantities, low depth and therefore low air-side pressure drops. 62, 63 mission critical Essential for operation of the entire system, with critical consequences in the event of failure 7, 32, 36, 54, 80 mixed mode Mixed operation comprising both mechanical cooling and Free Cooling 17, 18, 20, 21, 25, 60, 61, 62, 63, 64, 66, 86, 88, 89, 90, 96, 97 118 partial load Efficient operation during which precisely the required capacity is provided; the component or unit does not work at 100 % of its possible capacity 39, 65, 86, 89, 94, 97 PDU Power Distribution Unit; distributes power in the server rack 73 physical containment Structural measure for separating hot and cold air or supply air and return air 46 plug & play Simple installation and start-up of units 60, 62, 63, 64, 66 power consumption Power taken from an energy source by an electrical device or appliance 37, 39, 50, 101, 103 precision air conditioning (units) Highly specialized air conditioning systems, adapted to the requirements of information and communi- cations technology. Precision air conditioning units keep the room temperature constant precisely to the last degree, precisely regulate the relative humidity, filter the air and distribute the cooled air around the room intensively and uniformly. They are designed for failure-free continuous operation. 9, 15, 18, 26, 34, 36, 37, 41, 42, 44, 48, 49, 58, 60, 111 R rack Server cabinet; rack with mounting slots in which the server and other IT or network components are installed 42, 44, 45, 46, 47, 48, 49, 50, 51, 56, 70, 71, 72, 73, 76, 77 rack density Number of units and/or thermal load of a server rack 76 rack-based cooling Precision air conditioning units for cooling directly at the server rack 42, 44, 46, 48, 50 raised floor Second floor above the actual floor, with a cavity for cables and supply air 38, 45, 48, 49, 50, 54, 55, 56 RAL color Standardized color in an international color system 82 rated operation Operating state for which a device is designed and calculated 50 RDDC Rapid Deployment Data Centre; complete, pre-assembled data center in the form of a self-contained, transportable unit 82, 83 redundancy Additional presence of functionally identical components or units, to ensure continued operation in the event of malfunctions or failure 20, 21, 39, 56, 92, 97, 110 refrigerant circuit The basis of all processes for generating mechanical cooling capacity. Essential components are the com- pressor, condenser, evaporator and throttling device. 62, 63, 86, 87, 92, 97, 112, 113, 114 relative humidity Air humidity; proportion of water vapor in the air 17, 19 return air Exhaust air heated by the servers 20, 21, 36, 44, 45, 46, 48, 49 S scalable Can be changed in size / expanded in line with requirements 20, 23, 26, 68, 70, 80, 81, 83, 96 shelter Building similar to a container for accommodating IT equipment 5, 26, 58, 60, 62, 64, 66 SMDC Scalable Modular Data Centre; individual data center consisting of pre-configured modules 83 SNMP Simple Network Management Protocol 111 speed-controlled The speed is infinitely adjusted for variable power generation (partial load) 25, 45, 46, 51, 91