Numerical simulation of a novel VRF-SV hybrid system performance in a large retail facility in the tropics

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.