Yael's profile - activity

Thank you! You've been very helpful.

I have an HVAC system consisting of 2 parallel air-cooled chillers, each with a designated pump. For each of the pumps I assigned flow rate of 15 kg/s . On each of the chillers I specified Reference Chilled Water Flow Rate of 15 kg/s and Condenser Fluid Rate of 15.234 m3/h. Also, on the water cooling coil I put 15 kg/s on the Design Water Flow rate and Design Air Flow Rate of 4.342 m3/h.

However, I receive the following errors:

Water cooling coil:

* ~~~ * User-Specified Design Air Flow Rate [m3/s] = 4.34200 * ~~~ * differs from Design Size Design Air Flow Rate [m3/s] = 4.87859 User-Specified Design Water Flow Rate [m3/s] = 1.50000E-002 * ~~~ * differs from Design Size Design Water Flow Rate [m3/s] = 1.02900E-002 * ~~~ * This may, or may not, indicate mismatched component sizes.

For both chillers:

*** SizeChillerElectricEIR: Potential issue with equipment sizing for CHILLER - AIR COOLED 1 * ~~~ * User-Specified Reference Chilled Water Flow Rate of 1.50000E-002 [m3/s] * ~~~ * differs from Design Size Reference Chilled Water Flow Rate of 3.00000E-002 [m3/s] * ~~~ * This may, or may not, indicate mismatched component sizes. * ~~~ * Verify that the value entered is intended and is consistent with other components. *** SizeElectricEIRChiller: Potential issue with equipment sizing for Chiller:Electric:EIR CHILLER - AIR COOLED 1 * ~~~ * User-Specified Reference Condenser Fluid Flow Rate [m3/s] = 15.23400 * ~~~ * differs from Design Size Reference Condenser Fluid Flow Rate [m3/s] = 33.19680 * ~~~ * This may, or may not, indicate mismatched component sizes.

The question is, what am I doing wrong here and how can I fix these warnings? And where did it get the idea that the Chillers' Design Size Reference Condenser Fluid Flow Rate should be 33.19680 [m3/s]? Or that on the water cooling coil the Design Size Design Water Flow Rate should be 1.02900E-002 [m3/s]?

Thank you!

Equipment sizing errors I have an HVAC system consisting of 2 parallel air-cooled chillers, each with a designated pump.

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