https://orcid.org/0000-0002-4942-3640
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Abstract
In this paper, the performance of an integrated variable refrigerant flow (VRF) system with the stratum ventilation (SV) system was numerically examined and compared with the experimental measurements in terms of temperature distribution and airflow patterns. In total six different configurations were designed and analyzed. The results suggest that configuration 5 was greatly satisfied the airflow movement needs. The positive thermal gradient with a modest airflow velocity (< 0.8 m/s) was setup in the entire breathing zone. The indoor temperature in the range of 20°C–22°C was seen throughout the occupied space, except for some places near the walls. Furthermore, a very strong airflow throw from the SV supply terminals was observed with the recommended value of face velocity. Hence, the VRF-SV hybrid system could achieve a better thermal comfort (TC) and indoor air quality (IAQ) in large ACMV applications.
Acknowledgements
The authors would like to thank the University of Malaya for providing Partnership Grant RK005-2020 and IIRG Grant IIRG014-2019A to the authors for research work to be conducted at the University of Malaya. Thanks are extended to the Pakistan Government for the full scholarship provided to the first co-author, Mr. A.R. Umair, for conducting PhD research work in the HVAC&R Lab at the Department of Mechanical Engineering, University of Malaya. In addition, special thanks are extended to Prudentaire Engineering Sdn Bhd and Daikin R&D Malaysia Sdn Bhd for their contributions in the laboratory testing conducted in this project.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Nomenclature
| E | = | Total energy |
| F | = | Body forces |
| k | = | Turbulent kinetic energy |
| l/s | = | Liter per second |
| m | = | Meter |
| mm | = | Millimeter |
| m/s | = | Meter per second |
| oz | = | Occupied zone |
| Pa | = | Pascal |
| σ | = | Normal stress |
| T | = | Temperature |
| τ | = | Shear stress |
| ϵ | = | Dissipation of turbulent kinetic energy |
| s | = | Supply |
| ω | = | Dissipation of turbulent kinetic energy into internal thermal energy |
| φ | = | Energy dissipation |
| λ | = | Bulk viscosity coefficient |
| ρ | = | Density |
| t | = | Time |
| u | = | Velocity in X-direction |
| uz | = | Unoccupied zone |
| v | = | Velocity in Y-direction |
| w | = | Velocity in Z-direction |
| x | = | Coordinate and distance |
| y | = | Coordinate and distance |
| z | = | Coordinate and distance |