Variable water flow (VWF) systems
I am of the strong view that the technology is evolving to use the same components with a small variation. The industry is moving towards a variable water flow (VWF) system that includes a brazed heat exchanger and a water pump, in order to pump chilled water to the same indoor units that will use chilled water coils in lieu of a DX coil.
The new system will resolve two issues at one go. The refrigerant will be contained in the outdoor condensing unit, and the chilled water will allow ease of monitoring the performance from one side and also allow for larger pipes, which can be flushed and cleaned prior to final usage.
The VWF system has already been developed in Europe and Japan and will soon be marketed in the GCC market.
An improvement to the system would be to deploy the water-cooled regime through a cooling tower or geothermal energy. Indeed, a ground-source geothermal VWF system can reduce power consumption to a range of 0.7 to 0.9 kW/tonne, further improving efficiency. Towards utopia!
George Berbari is the CEO of DC PRO Engineering. He can be contacted at firstname.lastname@example.org
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