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?
Have an insight or suggestion?
Login or register to post a comment.
Jim Grant Forum Moderator 114 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.