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Energyplus Custom Meter for HVAC System

asked 2018-10-30 14:21:48 -0500

Chuangye Guan's avatar

updated 2018-10-30 16:24:12 -0500

Hi folks,

I am looking for a solution for assigning different HVAC systems to different meters.

This is for LEED utility cost calculation. A typical multifamily building uses a master meter for all common utility consumption, includes lighting, plug load, and HVAC, and all other residential units use individual meters. I understand that we are able to create a custom meter to account zone energy consumption, includes lighting and plug loads. My question is how can I assign the HVAC to the right meter in the idf file.

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Thank you

Chuangye Guan's avatar Chuangye Guan  ( 2018-10-30 14:23:03 -0500 )edit

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answered 2018-10-30 21:16:15 -0500

updated 2018-10-30 21:53:05 -0500

The Meter:Custom or Meter:CustomDecrement objects can be used to aggregate energy variables or meters. See the example file 5ZoneAirCooled as an example. In this file there are custom meters to aggregate lights, building electricity and decrement lighting from building electricity as other electric building as follows:

! The following custom meters are set up to illustrate the capabilities
! of custom meters.
! Custom Meter "MyGeneralLights" duplicates the InteriorLights:Electricity meter.
! Custom Meter "MyBuildingElectric" duplicates the Electricity:Building meter (by specifying that meter).
! Custom Meter (Decrement) "MyBuildingOther" uses Electricity:Building as its source meter
!   and subtracts out the values for MyGeneralLights (aka InteriorLights:Electricity).  The
!   resultant value for MyBuildingOther should be equal to the value for the meters
!   Electricity:Building - InteriorLights:Electricity (aka MyGeneralLights)

MyGeneralLights,         !- Name
Electricity,             !- Fuel Type
SPACE1-1 Lights 1,       !- Key Name 1
Lights Electric Energy,  !- Output Variable or Meter Name 1
SPACE2-1 Lights 1,       !- Key Name 2
Lights Electric Energy,  !- Output Variable or Meter Name 2
SPACE3-1 Lights 1,       !- Key Name 3
Lights Electric Energy,  !- Output Variable or Meter Name 3
SPACE4-1 Lights 1,       !- Key Name 4
Lights Electric Energy,  !- Output Variable or Meter Name 4
SPACE5-1 Lights 1,       !- Key Name 5
Lights Electric Energy;  !- Output Variable or Meter Name 5

MyBuildingElectric,      !- Name
Electricity,             !- Fuel Type
,                        !- Key Name 1
Electricity:Building;    !- Output Variable or Meter Name 1

MyBuildingOther,         !- Name
Electricity,             !- Fuel Type
Electricity:Building,    !- Source Meter Name
,                        !- Key Name 1
MyGeneralLights;         !- Output Variable or Meter Name 1

When this file is simulated the html file shows the results. The Energy Meters report shows these custom meters at the bottom of the table. Note the custom meter for MyGeneralLights matches the existing meter for total lighting as expected. The results are also shown in the *Meter.csv file if needed.

image description

Meter information can be found in the mtd file. You can combine any of the energy meters (energy transfer or electricity) on the custom meters. For the General Lights custom meter described above, the included energy meters are of course:

For Meter=GeneralLights:InteriorLights:Electricity [J], ResourceType=Electricity, EndUse=InteriorLights, contents are:
 SPACE1-1 LIGHTS 1:Lights Electric Energy
 SPACE2-1 LIGHTS 1:Lights Electric Energy
 SPACE3-1 LIGHTS 1:Lights Electric Energy
 SPACE4-1 LIGHTS 1:Lights Electric Energy
 SPACE5-1 LIGHTS 1:Lights Electric Energy
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Asked: 2018-10-30 14:21:48 -0500

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Last updated: Oct 30 '18