This document discusses a preliminary steady-state CFD simulation performed using Ansys Fluent on a particle-resolved packed bed of spherical particles, focusing on the impact of humidity. Results indicate a 10% difference in performance between humid and dry air, suggesting that the increase in liquid content warrants further exploration. The study highlights opportunities for future research in natural heat exchange technology for mines and seeks investor support.

1. Particle-Resolved Simulation with a
Mixture Model to Study the Effects
of Humidity
A preliminary steady-state CFD simulation was
completed in ANSYS Fluent 2021R2 on a particle-resolved
packed bed of spherical particles. Defaults were selected
for the phase interaction drag coefficient and
evaporation-condensation models.

2. Fluid Temperature
Fluid temperature decreased through the packed bed
due to a prescribed particle wall temperature
distribution.
Flow

3. Psychrometric Process
The psychrometric chart shows the approximate
upstream and downstream humidity content.
Chart created using http://www.flycarpet.net/en/psyonline

4. Air Volume Fraction

5. Water-Vapour Volume Fraction

6. Water-Liquid Volume Fraction

7. Performance
100% humidity
When compared against dry-air simulations, the preliminary
humid-air coefficient of performance is within 10%.
Although a 10% performance difference may be considered
nominal, the increase in liquid content merits further
investigation.
This preliminary study identifies an opportunity of future
work that can be completed on our Natural Heat Exchange
Engineering Technology for Mines project. We are currently
seeking investors to support the research. Please see
https://nheet.ca for details.