Re: [EnergyPlus_Support] Re: Pump causing Heating Unmet hours with increased Energy consumption

["Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Dear Javed,

My solution to (almost) every E+ problem is to review the key variables using Output:Variable. This normally provides a clue regarding the exact cause of the unmet hours. In your case, you can also compare the working file against the problem file.

There are so many ways in which a problem might arise! I'm fond of noting that there are "only" a few thousand inputs in a typical input file, so it should be very unlikely that one of them would be incorrect :)

On second thought, it is exceptionally easy for one of them to be incorrect by accident, oversight or inattention. This is true for inexperienced modelers as well as experienced modelers.

I recommend that you take a detailed look at the output.

On Mon, Sep 12, 2016 at 7:38 AM, Javed Iqbal eee.javed@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

The problem resolved as i checked with the designer and he confirmed there are NO Constant Speed pumps; all pumps VSD enabled. 

Thanks,

On Mon, Sep 12, 2016 at 4:00 PM, Javed Iqbal <eee.javed@xxxxxxxxx> wrote:

Dear All,

I am trying to simulate following plant arrangement in an industrial building in climatic zone 5A. However:

1. When i run the simulation with All VSD pumps then it runs smoothly with NO unmet load hours and relatively better enegry performance
   
2. When i run the simulation with two VSD and a constant pump (as shown below) it gives my very high heating unmet hour and energy consumption shoots up 1.3 times. 

Any insight would be highly appreciated.

Thank you in advance.

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Javed Iqbal, LEED AP, CEA

Sr. Energy Analyst 

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Javed Iqbal, LEED AP, CEA

Sr. Energy Analyst 

--

James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx

Website l  LinkedIn | May 2016 ASHRAE Journal article on energy modeling

Believers in progress rightly note that in the world of machines, the new model supercedes the old; from this they falsely infer a similar kind of supercession in such things as virtue and wisdom 

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Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

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