First time here? Check our help page!
Ask Your Question
2

How the chiller performance curve affect to plant sizing calculation

Hi!
Based on the idf file which already run successfully, I just changed 3 performance curve for chiller:Electric:EIR and tried to run again.
However, I got following error at plant sizing calculation.
* Warning * Check input. Pump nominal power or motor efficiency is set to 0, for pump=CHW VAR SPD PUMP SD1 * Warning * Check input. Pump nominal flow rate is set or calculated = 0, for pump=CHW VAR SPD PUMP SD1 * Warning * SizePlantLoop: Calculated Plant Sizing Design Volume Flow Rate=[1.73E-016] is too small. Set to 0.0 * ~~~ * ..occurs for PlantLoop=SD1 CW LOOP * Warning * SizePump: Calculated Pump Nominal Volume Flow Rate=[1.73E-016] is too small. Set to 0.0 * ~~~ * ..occurs for Pump=CW VAR SPD PUMP SD1

I tried to understand how plant sizing calculation is executed in engineering reference. But I cannot find any clue why changing chiller performance curve lead to this error.
Does anyone know any clue why this error is happening?

katsuya.obara's avatar
2.1k
katsuya.obara
asked 2017-05-04 09:12:44 -0500
edit flag offensive 0 remove flag close merge delete

Comments

add a comment see more comments

1 Answer

3

The chiller is on the plant supply side. The plant flow rate is set based on the requirement of the demand side of the plant loop (e.g., water coil flow requirements). So changing the chiller performance curves should have nothing to do with plant water flow rate. If the chillers performance curves are really the only thing you've changed then you should request help at energyplus.helpserve.com or attach your input file here so we can see it.

rraustad's avatar
13.8k
rraustad
answered 2017-05-04 09:38:35 -0500
edit flag offensive 0 remove flag delete link
more

Comments

Thank you for your reply. I found that I wrongly input Sizing factor very small in Chiller:Electric:EIR which caused this error. It was not related to performance curve.

katsuya.obara's avatar katsuya.obara (2017-05-05 06:24:15 -0500) edit
more
  • delete
add a comment see more comments