RE: [EnergyPlus_Support] Re: Heat Demand in Chilled Water loop??

If you do not post the IDF, no one will know exactly what is going on.

That is one reason why I seldom response to questions without an IDF.

There are too many possibilities.

AVG only shows how the nodes are connected according to your input.

I never use anual simmulation and hourly averaged result for debugging IDF.

The result of one day weather file sizing is not the same as that from a DesignDay sizing.

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: kwalkerman@xxxxxxxxx
Date: Tue, 9 Aug 2011 14:22:25 -0400
Subject: Re: [EnergyPlus_Support] Re: Heat Demand in Chilled Water loop??

I believe it was the Plant Loop Heating Demand [W](Hourly) and Plant Loop Cooling Demand [W](Hourly) that were giving odd numbers at times when the flowrate was low.

Karen

On Tue, Aug 9, 2011 at 12:18 AM, Jean marais <jeannieboef@xxxxxxxxx> wrote:

Wigs! Karen, which PlantLoop Output Variable name EXACTLY are you refering to? I'm busy with a very high profile, highly political Summer Design Day simulation at the minute, and I can't be less than 100% sure. I am looking specifically when and how much my peak Load for the plant is...we're talking in the range if Mega Joules so small mistakes = lots of money.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Qianmin Zhang <zqianmin@...> wrote:
>
> Thanks Karen.
>

> On Mon, Aug 8, 2011 at 9:10 AM, Karen Walkerman <kwalkerman@...>wrote:

>
> > **
> >
> >
> > I have seen the same thing happen when the terminal unit is a 4-pipe fan
> > coil. I'm not sure if it happens with other systems. I believe it is the
> > subject of a bug-fix for the next round of Energy+.
> >
> > I have also found that the hourly results reporting for loop loads is a
> > little misleading. The hourly loop loads seem to be based on the difference
> > between the loop setpoint temperature and the current temperature, and not
> > the actual heat transferred by the loop. If you want to know how much heat
> > your loop is transferring, I suggest calculating it based on the flowrate
> > and inlet and outlet temperatures.
> >
> > --
> > Karen
> >

> > On Mon, Aug 8, 2011 at 11:35 AM, Qianmin Zhang <zqianmin@...> wrote:
> >
> >>
> >>
> >> Hello,
> >>
> >> I have heat demand in both chilled water loop and hot water loop. I'm not
> >> expecting the heat demand in chilled water loop. My hvac map .svg file has
> >> the correct connection. Any one know why there is heating demand in chilled
> >> water loop? Attached is the hvac map generated from energyplus. Thanks a
> >> lot,
> >>
> >> Regards,
> >> Qianmin
> >>
> >>
> >
> >
>

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