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Optimum Part Load Ratio

asked 2022-10-06 08:19:48 -0500

Keigo's avatar

updated 2022-10-06 08:59:50 -0500

Chiller and Boiler objects such as Chiller:Electric:EIR have a Field: Optimum Part Load Ratio. What is this for? I tried changing the ratio, but the simulation result didn't change at all, which makes sense as chiller/boiler performance is defined by performance curves. This is an unnecessary field, isn't it?

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answered 2022-10-06 08:48:51 -0500

updated 2022-10-06 08:49:28 -0500

In the PlantLoop object is an input for Load Distribution Scheme.

  Optimal;          !- Load Distribution Scheme

Choices are:

A14, \field Load Distribution Scheme
    \type choice
    \key Optimal
    \key SequentialLoad
    \key UniformLoad
    \key UniformPLR
    \key SequentialUniformPLR
    \default SequentialLoad

This input is set up to allow a set of chillers (2 or more) to run the first few chillers at optimum part load ratio while the last chiller meets the remaining load. I have not tested this but it is supposed to work this way. I'm not sure what happens with only 1 chiller.

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I see! I tested Optimal Load Distribution Scheme with 2 chillers. The chillers worked as you explained. But then, Optimal Load Distribution Scheme does not refer to performance curves. I misunderstood that. Thank you for your answer.

Keigo's avatar Keigo  ( 2022-10-06 23:12:36 -0500 )edit

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Asked: 2022-10-06 08:19:48 -0500

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Last updated: Oct 13 '22