Why is it a usual practice in an HVAC chilled water piping system to size the three-way mixing valve to a dimension that is one step lower to the size of the pipe line that is feeding chilled water to the evaporator coil?
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Jim Grant Forum Moderator 120 Posts
Re: Optimum Pipe Size Practices26 February 2009 at 1:29pmThe question you ask is really one of optimum pipe size based on pumping costs and available pressure drop. If the circulating chilled water loop operates at a substantially higher flow rate than the application requires (i.e., the diversion flow is smaller), then it would make sense to go to a lower pipe diameter for economic reasons.