HVAC demand power calculation

asked 2021-06-02 21:10:18 -0500

Revathi gravatar image

updated 2021-06-03 13:40:38 -0500

I am using the 2ZoneDataCenterHVAC_wEconomizer-baseline.idf for the calculation of the energy demand.

Noticed that the following components are used for HVAC power demand.

For Meter=Electricity:HVAC [J], ResourceType=Electricity, Group=HVAC, contents are: NORTH ZONE SUPPLY FAN:Fan Electric Energy
SOUTH ZONE SUPPLY FAN:Fan Electric Energy
NORTH DATA CENTER IEC:Evaporative Cooler Electric Energy
SOUTH DATA CENTER IEC:Evaporative Cooler Electric Energy
NORTH DATA CENTER DEC:Evaporative Cooler Electric Energy
SOUTH DATA CENTER DEC:Evaporative Cooler Electric Energy
NORTH DX COOLING COIL:Cooling Coil Electric Energy
SOUTH DX COOLING COIL:Cooling Coil Electric Energy

However when I sum up the energy and multiply the sum by timestep and divide by 3600(hourly), its not giving the exact values of whole facility hvac give n by Energyplus. Could anyone explain me the calculation. Thanks in advance.

For ex:

WEST ZONE SUPPLY FAN:Fan Electric Energy J = 7320688.8
EAST ZONE SUPPLY FAN:Fan Electric Energy J=8180277.685
WEST DATA CENTER IEC:Evaporative Cooler Electric Energy J=0
EAST DATA CENTER IEC:Evaporative Cooler Electric Energy J=0
WEST DATA CENTER DEC: Evaporative Cooler Electric Energy J=108000
EAST DATA CENTER DEC: Evaporative Cooler Electric Energy J=108000
WEST DX COOLING COIL:Cooling Coil Electric Energy J=0
EAST DX COOLING COIL:Cooling Coil Electric Energy J=0

Total = 15716966.49
total*4/3600 = 17463.29609

However the Energy plus value for the
Whole Building Facility Total HVAC Electric Demand Power W = 32846.20527

Am i missing any calculation? Could anyone assist?

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