Abstract
This study demonstrates the method to evaluate the performance of water saving type water closets with a built-in flush valve which are directly connected to the water supply pipe, i.e. they do not require any space to accommodate cisterns, and aims to suggest data which is contributable to piping design when such a water closet of this type is installed to a horizontal fixture drain branch. To be more specific, this study discusses the following three points: (1) regarding the evaluation of drainage performance, identify the relationship of the flow rate supply water and the fluctuation of supply water pressure with the discharge rate of toilet paper; (2) regarding the identification of drainage characteristics, verify decrease values of the average fixture drainage flow rate corresponding to different piping patterns and the method to calculate the values; and (3) regarding the evaluation of carrying performance, compare carrying distances with conventional-type water closets and identify the relationship of the flow depth, which is a carrying limit, the pipe flow rate and a decrease value of the average fixture drainage flow rate.
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