Is district cooling flexible enough for a shopping mall environment?
The cooling design incorporates a number of important features ensuring flexibility, which is one of the key requirments for a shopping mall. In particular, the chilled water distribution system is flexible and efficient at part load conditions. Firstly, the primary chilled water distribution ring, which distributes chilled water from the roof to the entire development, is a variable volume system with VFD operated pumps. There are also eight secondary chilled water variable volume pumping stations using VFD operated pumps, located strategically around the roof of the mall to serve eight main internal distribution zones. To ensure stable control on all terminal units and on AHU coils at all load conditions, a significant investment has been made to provide pressure-independent control valves for every cooling coil. The use of pressure-independent control valves will ensure that a valve authority of one is provided under operating conditions, which will lead to very stable control. The
