Optimum Part Load Ratio

asked 2022-10-06 08:19:48 -0600

Keigo
4111 ●1 ●48 ●21 https://www.linkedin.c...

updated 2022-10-06 08:59:50 -0600

Aaron Boranian

14250 ●86 ●24 http://bigladdersoftware.com/

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?

answered 2022-10-06 08:48:51 -0600

rraustad

13844 ●79 ●12 http://www.fsec.ucf.edu/

updated 2022-10-06 08:49:28 -0600

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

PlantLoop,
  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.