Projects
Through various simulations and pros and cons analysis , the HVAC system selected for this project was a variable refrigerant flow ( VRF ) heat recovery system , with pre-treated fresh air . The system offers a flexible and reliable solution , with high energy efficiency and was found to be a suitable option for the buildings application .
VRF systems are energy efficient as the system is designed to run on the exact capacity required for the current cooling conditions . The VRF system detects what the zone requirements are and directs the appropriate amount of refrigerant to meet the requirements . Their efficiency and low energy consumption means lower utility bills , which cannot be bypassed especially in these challenging economic circumstances . The glass specifications were reviewed and the most efficient combination between u-value and cost was selected .
All photos by RACA Journal
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“ Designing an exposed HVAC system comes with many challenges , however , if the challenges are overcome the completion of the project is rewarding .”
1 . The common extract fan located on the roof , in a different orientation to that of the fresh air system .
2 . Office cassette units located within bulkhead .
3 . The outdoor unit condensers located on the roof .
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www . hvacronline . co . za RACA Journal I January 2021 45