DCN August 2016 - Page 18

cooling applications such as desalination, refrigeration and even the production of electricity. The paper concludes, however, that the best economic value is achieved when recovered heat at a temperature of about 70°C is used for space heating purposes. This directly exposes one of the major issues around data centre heat reuse at the moment. Servers generally remove their heat using air. Currently, in the best case this heat is rejected at a temperature of about 3540°C. Generally, it is lower. Depending on the heat collection effectiveness, this temperature quickly drops to 28°C before the heat is captured in a system that can transport it to the user. Water cooled servers will eliminate this problem. But these are still at least five years away from becoming mainstream and have been so for the past 15 years. This article therefore only considers air cooled servers. Nevertheless, more recently, several operational systems have been realised in The Netherlands. In particular, campus settings with a large share of the building population being new builds are interesting. These often utilise low temperature heating technologies, where data centres in combination with underground aquifer cold and warmth storage can be a real asset to the campus. Similarly, at 18 a different campus a data centre has been connected to a dis-balanced warmth and cold ring. With the connected buildings asking for more heat than is available, and producing more c BF2&WV&VBFW6RFF6VG&W2vW&RvV6R6V7FFF2&rFR6FVPFW6R7V66W727F&W22FP6W&FvF6W2F2&Vr6BFRFVR`VW&w&WW6R26( WBbFR&( F涖rf"6W"FF6VG&W0FW&R&R'GVFW3ff6W26&R&FVFVBB6VB'p6'BW6RbFRFF6VG&RV@&Vf77FVvBbRFBWBfRV@&WW6R7W7FW"'WBvBF&W&Pf"SW"&W7B&WB&Rখ7FƖr6VBvFW"77FVv6f"ǒƗGFRWG&fW7FVB6&PWVVBvFVBW6vW"f &VƗ6rVB'fW7BB&WW6RF7V&6RFR&fSFP6VvRf"VB&WW6R2VFW FfBV&'W6W'2FB6PvBW6RbFRf&RVB"FG&6fW"FRrw&FRFW&VW&wv&"Bv&vFW"Fvw&FRFW&VW&wFB2&vW VFV6Rb76&R67VW'2FRGFW"&WV&RFFFfW7FVG2f"7F6Rf"FFFVBV2BFR'W6W7266PFW&Vf&R6VB&WV&RwV&FVV@7W7FW'2vFFVF6FVB6G&7G2ࠥvB6VBVWCBrWrBW6Fp76&R6&&F2&Rf6&PFR&FRGWF6v70W6Rw&7VGW&RGW7G'&vP67VW"bVBBvW"0VFrFfW7FvFRFRfV6&ƗGbWGFrW6W72FF6VG&RV@FvBW6RF22GW7G'v6267W7FVBF&vR66P6W&FVW&w&V7G2@&FWfVVBआvWfW"vRW"6VB`FRW&FWVFGW&W2bv70W6Rw&VVW&W22VW&w&VFVB@2BV6W76&ǒvfVFBWFW&VB7Wǒ2&WV&VBBFWVG0FR7&2w&vFW6RvVW&ǐfFGv6FVv&W2ƗB"VƗBƗB7&2FVB&vRVFFW0bVV7G&6Gv627W'&VFǐ7BVff6VFǒ&GV6VBW6r6vVW&Ff6ƗFW2FBBFR6PFR&fFRFR&WV&VBVB'W@FRƗB7&27F&WV&RVB@w&VVW6Rf&W'2F&Rv&p&VGV6rFRW6Rbf76gVV2FW&Vf&RvF&FWfVV@vF6WfW&w&vW'2FW&Rvv0&R7V'7FF&6RBFB6&R7W'FVB'FF6VG&Rf6ƗFW2Ww&FrFRf&RFF6VG&PVB'V2bVBV2v&P&WV&VB2FRFVFVW&GW&R`FRVFrVFVw&VVW6W20c<+2vVv&rFv&G2&VƗ6pFRV6W76'f6ƗFW2FF6VG&Rw&VVW6R6&&F6G&rFRWFV6fR6W&FrWW&V6PbFRw&VVW6RGW7G'6&RfWrV'>( FPFRF7G6BR6W'fRf"FW ֖vBfR&VVw&vg&FPVB&GV6VB'W"f6V&@vG47FfFW2ࠠ