Project for the space . The AHU unit supplies full fresh air to the pool space at 3.2 m ³/ s , while also extracting the air from the space and exhausting directly to atmosphere .
HVAC SYSTEM AND SELECTIONS For this project it just made sense to select a VRF system because of the location of the rooms and the limitations that would exist in terms of condenser placements - being a high-end center with neat finishings . Daikin was the system of choice for WSP as they successfully won the appointment of the equipment tendering due to cost , specification compliance and quality .
When it came to the selections around the pool area , it is considered good practice to have a dedicated stand-alone system serving such an area . Since the rest of the system would comprise a refrigerant driven system , it was logical to also then include a refrigerant driven type unit providing the cooling to the pool AHU . This was achieved by a unit set supplied by Ecoaire through the same fair tendering process .
The DX coil is needed to control both temperature and assist with achieving acceptable humidity levels within the space . The American Society of Heating , Refrigerating and Air-Conditioning Engineering ( ASHRAE ) - HVAC Applications - Chapter 6 that specifically relates to natatoriums or indoor swimming pools , documentation provides significant insights and guidance towards the engineering required in these applications in terms of specifications and sizing of units - particularly when heated pools are involved . These standards also provide substantial guidance on humidity control , ventilation requirements , air distribution , duct design , pool water chemistry and evaporation rates .
The basement parking area contains a simple extract ventilation system in the form of jet fans under soffits that operate as an on / off solution linked to various CO sensors located in the space . These sensors continuously monitor the CO levels and once they reach a certain pre-set value , the fans switch
One of the split wall units in an office area .
One of the jet fans as part of the basement extract system .
The laundry room extract ducting and split unit .
“ Design methodology had to take into account a number of factors that would suitably service the needs of the occupants in each space .”
www . hvacronline . co . za RACA Journal I April 2022 31