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OpenStudio Plant Sizing issue

asked 2020-10-28 08:30:05 -0600

Babak gravatar image

I have a primary-secondary chiller with common pipe simulation as can be seen below:

image description

I want to have primary and secondary loops separated by an ideal heat exchanger. I created an empty water loop and moved my chiller and constant speed pump to its supply side. Then I added the fluid-to-fluid heat exchanger as below:

image description

The issue is that the chiller size (autosize and same chiller) is twice as the previous configuration. I believe it should be the same. I appreciate if you got any advice for me.

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answered 2020-10-28 08:36:59 -0600

It a sizing issue and you should take a look at the sizing:plant settings which are right below the PlantLoop settings. When you add a new water loop in OpenStudio, by default sizing:plant inputs are for the water heating loop. So you need to change the temperature settings. It should solve your problem.

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Asked: 2020-10-28 08:30:05 -0600

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Last updated: Oct 28