Mea­sure en­ergy to man­age it

DEMM Engineering & Manufacturing - - ENERGY EFFICIENCY -

A clas­sic suc­cess story us­ing Jan­itza power anal­y­sers and me­ters continues at The Univer­sity of Otago in Dunedin.

Hans Pi­etsch, en­ergy man­ager at the property ser­vices’ di­vi­sion at the univer­sity, re­placed his power me­ters and some other en­ergy mea­sur­ing in­stru­ments with the Jan­itza UMG604 Din-rail mounted power anal­yser, and UMG96 RM panel mounted slave me­ters to mea­sure and an­a­lyse the power con­sump­tion in some cam­pus build­ings.

The project was aimed to have real time mon­i­tor­ing, en­ergy cost al­lo­ca­tion, load mon­i­tor­ing, and load con­trol. The univer­sity takes part in a load con­trol pro­gramme that re­quires some load to be switched off rapidly (less than one sec­ond) when­ever the sup­ply fre­quency drops be­low a min­i­mum thresh­old. To achieve this, elec­tri­cal loads are ei­ther con­trolled di­rectly by the me­ters or through the BMS via the UMG604 in each in­di­vid­ual build­ing on their net­work.

The univer­sity paid for its re­quired power con­sump­tion data. To­day, en­ergy con­sump­tion data is gath­ered from the UMG604 me­ters over the LAN and used to al­lo­cate the cost of elec­tri­cal en­ergy to each build­ing and fa­cil­ity. Ini­tially, the cost sav­ing from about 18 months’ worth of data ac­qui­si­tion ser­vice was suf­fi­cient to cover the cost of butting the Jan­itza in­stru­ments.

Di­rect Con­trol’s tech­ni­cal team helped in­te­grat­ing these in­stru­ments into their net­work by pro­vid­ing the re­quired tech­ni­cal as­sis­tance, train­ing, and on­go­ing sup­port.

The cur­rent in­stall base has about 50 UMG604 en­ergy me­ters and more than 40 UMG96RM slave me­ters mon­i­tor­ing elec­tri­cal power con­sump­tion in its build­ings and net­worked through their lo­cal area net­work (LAN).

These me­ters are now used for load shed­ding func­tions and help sta­bi­lize the sup­ply fre­quency al­most in­stantly by us­ing some of the PLC func­tion­al­i­ties em­bed­ded in the UMG604, and act­ing di­rectly on lo­cal loads with­out de­lays caused by slow LAN traf­fic.

With dig­i­tal in­puts and out­puts, the UMG604 also has the abil­ity to per­form some sim­ple PLC func­tions lo­cally. En­ergy MAX (load Shed­ding) and cost cal­cu­la­tion are a few of the additional fea­tures of the UMG604.

With these me­ters in place, and with many oth­ers to pos­si­bly come in fu­ture, The Univer­sity of Otago could eas­ily ex­pand this net­work and use the web based Jan­itza en­ergy por­tal to have a com­plete vi­su­al­iza­tion, mon­i­tor­ing and data anal­y­sis of the en­tire cam­pus. This will pro­vide an in­valu­able in­sight to­ward fur­ther cost sav­ings in fu­ture.

See Di­rect Con­trol at the EEA con­fer­ence trade show, Stand 108, in Sky City con­ven­tion cen­tre in Auck­land from 18-20 June 2014

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