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Peak Cooling Demand is Zero even there is good amount of Cooling Energy Consumption

asked 2017-08-31 16:57:13 -0600

updated 2017-08-31 17:16:08 -0600

Can anyone explain me the different scenario when the Cooling Peak Demand is absolutely Zero, but there is a good amount of energy consumption for cooling?

The 35 floor (600,000) sqft office building is located in Anchorage (very cold climate), but I still assume the core zones will have cooling due to the high internal heat gains.

Image for Energy Consumption: image description

Image for Peak demands: image description

I also see that the "peak demand" chart shows the cooling peak for January 9th, while its somewhere around June-August for most of the northern hemispherical locations.

Any experience with such issues for the particular/similar locations? What's the fix here?

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Exterior lighting at 8:15 in the morning looks very high, you might want to check your controls/schedules for that.

JasonGlazer gravatar image JasonGlazer  ( 2017-09-04 08:08:32 -0600 )edit

I modeled the elevators as the exterior lighting for the concept level phase.

Harshul Singhal gravatar image Harshul Singhal  ( 2017-09-05 15:07:35 -0600 )edit

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answered 2017-08-31 20:33:56 -0600

The peak demand in the graph you show above is peak facility demand, and the values are the component contributions to peak demand. If you add up each end use, you will see it equals that total end uses peak. This demand is occurring in January at a time when there is no cooling demand.

This is still an odd result though. Lighting and equipment are on regular schedules, so we would expect the added cooling in summer to cause the peak electrical demand to occur then. What may be happening is that your fan and pump energy is peaking at this time in a heating condition, so perhaps there is some issue with how you have your plant/air loop sizing set up for heating design conditions.

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I think the TMY3 files for anchorage has some issues too.

Harshul Singhal gravatar image Harshul Singhal  ( 2017-09-01 16:58:53 -0600 )edit

I ran it with TMY2 weather data, worked fine.

Harshul Singhal gravatar image Harshul Singhal  ( 2017-09-01 16:59:10 -0600 )edit

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Asked: 2017-08-31 16:57:13 -0600

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Last updated: Aug 31 '17