Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study
A variable refrigerant flow integrated stratum ventilation (VRF-SV) system was proposed as an energy efficient substitute for conventional central cooling systems for buildings. The novel system provided conditioned air to enclosed spaces with high indoor air quality and thermal comfort. This study...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/4/1265 |
| _version_ | 1797480808385085440 |
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| author | Yat Huang Yau Umair Ahmed Rajput Altaf Hussain Rajpar Natalia Lastovets |
| author_facet | Yat Huang Yau Umair Ahmed Rajput Altaf Hussain Rajpar Natalia Lastovets |
| author_sort | Yat Huang Yau |
| collection | DOAJ |
| description | A variable refrigerant flow integrated stratum ventilation (VRF-SV) system was proposed as an energy efficient substitute for conventional central cooling systems for buildings. The novel system provided conditioned air to enclosed spaces with high indoor air quality and thermal comfort. This study investigated the effects of different types of ASTDs on the performance of the VRF-SV hybrid system. The performance was experimentally evaluated with five air terminal types, including bar grille, double deflection grille, jet slot, perforated and drum louver diffusers. The evaluation was carried out using standard indices: temperature and velocity distribution, airflow pattern, effective draft temperature (EDT), air distribution performance index (ADPI), thermal sensation vote and comfort feedback survey. The results indicated that the ASTD type had a significant impact on airflow pattern. Furthermore, the bar grille diffuser provided the occupants with greater thermal comfort and acceptable indoor environment. Almost all the EDT values determined in the breathing zone in the case with bar grille diffuser found under the satisfactory range, i.e., −1.2 < K < 1.2. Based on these values, the ADPI for bar grille diffuser was calculated as 92.8%. Thus, the bar grille diffuser is recommended to be installed with the VRF-SV hybrid system in buildings. |
| first_indexed | 2024-03-09T22:05:28Z |
| format | Article |
| id | doaj.art-538597d297ae48d1babb6b8e9dae2445 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T22:05:28Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-538597d297ae48d1babb6b8e9dae24452023-11-23T19:41:20ZengMDPI AGEnergies1996-10732022-02-01154126510.3390/en15041265Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental StudyYat Huang Yau0Umair Ahmed Rajput1Altaf Hussain Rajpar2Natalia Lastovets3Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, MalaysiaDepartment of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, MalaysiaDepartment of Mechanical Engineering, College of Engineering, Jouf University, Sakaka 42421, Saudi ArabiaCivil Engineering Unit, Tampere University, 33720 Tampere, FinlandA variable refrigerant flow integrated stratum ventilation (VRF-SV) system was proposed as an energy efficient substitute for conventional central cooling systems for buildings. The novel system provided conditioned air to enclosed spaces with high indoor air quality and thermal comfort. This study investigated the effects of different types of ASTDs on the performance of the VRF-SV hybrid system. The performance was experimentally evaluated with five air terminal types, including bar grille, double deflection grille, jet slot, perforated and drum louver diffusers. The evaluation was carried out using standard indices: temperature and velocity distribution, airflow pattern, effective draft temperature (EDT), air distribution performance index (ADPI), thermal sensation vote and comfort feedback survey. The results indicated that the ASTD type had a significant impact on airflow pattern. Furthermore, the bar grille diffuser provided the occupants with greater thermal comfort and acceptable indoor environment. Almost all the EDT values determined in the breathing zone in the case with bar grille diffuser found under the satisfactory range, i.e., −1.2 < K < 1.2. Based on these values, the ADPI for bar grille diffuser was calculated as 92.8%. Thus, the bar grille diffuser is recommended to be installed with the VRF-SV hybrid system in buildings.https://www.mdpi.com/1996-1073/15/4/1265VRF-SV hybrid systemair supply terminal device (ASTD)air diffusion performance index (ADPI)airflow patternthermal comfort |
| spellingShingle | Yat Huang Yau Umair Ahmed Rajput Altaf Hussain Rajpar Natalia Lastovets Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study Energies VRF-SV hybrid system air supply terminal device (ASTD) air diffusion performance index (ADPI) airflow pattern thermal comfort |
| title | Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study |
| title_full | Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study |
| title_fullStr | Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study |
| title_full_unstemmed | Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study |
| title_short | Effects of Air Supply Terminal Devices on the Performance of Variable Refrigerant Flow Integrated Stratum Ventilation System: An Experimental Study |
| title_sort | effects of air supply terminal devices on the performance of variable refrigerant flow integrated stratum ventilation system an experimental study |
| topic | VRF-SV hybrid system air supply terminal device (ASTD) air diffusion performance index (ADPI) airflow pattern thermal comfort |
| url | https://www.mdpi.com/1996-1073/15/4/1265 |
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