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EMS program calling point

asked 2015-11-05 14:06:54 -0600

ngkhanh's avatar

updated 2015-11-06 09:37:44 -0600

Hi I implemented the thermostats schedule example did by nadish21 and Ivan Korolija at It run greatly for zone system only, but when i apply to dualduct (DOAS + VRF room terminal) the program gets wrong result of schedule. i have no ideal what was happen with it.

Link for VRF only :


Please anyone who know give me some advises ? Thanks

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answered 2015-11-13 11:47:04 -0600

From inspecting the idf files, I see one problem (with or without EMS).

SPACE1-1 Equipment,      !- Name
ZoneHVAC:AirDistributionUnit,  !- Zone Equipment 1 Object Type
SPACE1-1 DOAS ATU,       !- Zone Equipment 1 Name
2,                       !- Zone Equipment 1 Cooling Sequence
2,                       !- Zone Equipment 1 Heating or No-Load Sequence
ZoneHVAC:TerminalUnit:VariableRefrigerantFlow,  !- Zone Equipment 2 Object Type
SPACE1-1 TU,             !- Zone Equipment 2 Name
1,                       !- Zone Equipment 2 Cooling Sequence
1;                       !- Zone Equipment 2 Heating or No-Load Sequence

See how the DOAS terminal unit (2) is set to be simulated after the VRF unit (1). This is backwards. The DOAS terminal unit should be simulated first so that the VRF (or any other type of controllable zone HVAC equipment) can see the impact of the DOAS flow on the net zone load. Trade the 2's and 1's in all of the ZoneHVAC:EquipmentList.

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Thank for your comment, it was not the main point - i made a wrong variable name call and after correct it, the program runs ok. However, i still have question with EMS calling point. How i can setup EMS calling point for all year simulation only and sizing only ?

ngkhanh's avatar ngkhanh  ( 2015-11-15 11:44:38 -0600 )edit

By "sizing only" do you mean the autosizing calculations, or simulations of the sizing periods? If you mean simulation of the sizing periods, you could place a sensor on Site Day Type Index and test for SummerDesignDay=9 or WinterDesignDay=10.

MJWitte's avatar MJWitte  ( 2015-11-17 10:38:07 -0600 )edit

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Asked: 2015-11-05 14:06:54 -0600

Seen: 185 times

Last updated: Nov 13 '15