[TRNSYS-users] Type511 fluid cooler Design ambient air temperature > 20 °C

Eric Peterson E.Peterson at leeds.ac.uk
Tue May 15 09:23:26 PDT 2018

Regarding the Type 511 Dry Fluid Cooler by Jeff W. Thornton last modified September 2014

"Type511 models a dry fluid cooler; a device used to cool a liquid stream by blowing air across coils containing the liquid.
This model assumes that the device can be modeled as a single-pass, cross-flow heat exchanger;
which is typically how these devices are constructed."

I read in blog somewhere that you must change the seventh parameter from 28 °C default to 20 °C.
"The dry-bulb temperature of the air entering the device at design conditions"

Why shouldn't users be able to specify higher ambient conditions without the TRNSYS ERROR
"The dry cooler model was unable to correctly calculate the number of transfer units (NTU) for the design condition.
Please check the design conditions carefully."

In practice ambient may reach 45°C in summer heat wave conditions.

Eric Peterson, PhD, PE, RPEQ, M-ASHRAE TC4.2 Climatic Data
Research Fellow in Geothermal Systems Modelling
School of Civil Engineering, University of Leeds
Leeds, West Yorkshire LS2 9JT United Kingdom
Telephone +44 (-0) 11334 31957

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