Negative Cooling Energy

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Hi all,

I am working on a project in Toronto, Canada and the cooling energy end use
as shown in the Report-BEPS in the DOE file is negative! Did anyone
experience this before or have an explanation to this behavior?

I appreciate any assistance.

Regards,

Ahmed Azhari, B.Eng., LEED AP

Ahmed Azhari's picture
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Joined: 2011-09-30
Reputation: 0

When I was experimenting with custom chiller curves, one of my experiments produced negative energy. If you have custom curves, you may want check them.

Jeremy McClanathan, LEED(r) AP BD+C

Jeremy McClanathan's picture
Joined: 2011-09-30
Reputation: 200

Thanks Jeremy. I am in fact using the default chiller curves.

Ahmed

Ahmed Azhari's picture
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Joined: 2011-09-30
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Hi Ahmed,

I've never heard of negative energy results being reported in the BEPS/BEPU
reports. I don't doubt it instance, but there must be an incorrect input
that is causing this.

It would help us to help you if you would share your .pd2 & .inp file (and
your weather file if it is non-standard.) and we can look through your file
to help you.

Regards,
Pasha

Pasha Korber-Gonzalez's picture
Joined: 2011-09-30
Reputation: 600

Hi Ahmed,

I've seen this when either the chiller is dramatically undersized for
the load or more likely the cooling tower is dramatically undersized --
also check your loop capacities and flows.

If none of that works I can take a quick look if you send me your .pd2
and .inp.

Brian

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Joined: 2011-09-30
Reputation: 201