Modeling particle deposition on HVAC heat exchangers
Fouling of fin-and-tube heat exchangers by particle deposition leads to diminished effectiveness in supplying ventilation and air conditioning. This paper explores mechanisms that cause particle deposition on heat exchanger surfaces. We present a model that accounts for impaction, diffusion, gravitational settling, and turbulence. Simulation results suggest that some submicron particles deposit in the heat exchanger core, but do not cause significant performance impacts. Particles between 1 and 10 {micro}m deposit with probabilities ranging from 1-20% with fin edge impaction representing the dominant mechanism. Particles larger than 10 {micro}m deposit by impaction on refrigerant tubes, gravitational settling on fin corrugations, and mechanisms associated with turbulent airflow. The model results agree reasonably well with experimental data, but the deposition of larger particles at high velocities is underpredicted. Geometric factors, such as discontinuities in the fins, are hypothesized to be responsible for the discrepancy.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Energy Efficiency and Renewable Energy; California Institute for Energy Efficiency, Award No. BG-90-73 (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 791808
- Report Number(s):
- LBNL-49339; R&D Project: 470901; TRN: US200204%%125
- Resource Relation:
- Conference: Indoor Air 2002, Monterey, CA (US), 06/30/2002--07/05/2002; Other Information: PBD: 1 Jan 2002
- Country of Publication:
- United States
- Language:
- English
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