Rainwater harvesting tank capacity optimization for flushing demand of UPLB dormitories based on simulations using yield-after-spillage and yield-before-spillage operating rules

Date

6-2015

Degree

Bachelor of Science in Civil Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Perlie P. Velasco

Abstract

This study investigated the use of simulation analysis, using mass balance approach, in sizing rainwater harvesting tanks for toilet-flushing water demand of UPLB dormitories. Simulations were based on yield-after-spillage and yield-before-spillage operating algorithms. This study includes data-gathering, estimation of toilet flushing demand and catchment area of dormitories, simulation of rainwater tanks, simplification of tank-sizing method, and estimation of optimal design tank volumes. Rainfall data from year 2000 to 2013 was acquired from the National Agrometeorological Station ? UPLB. Catchment area of the dormitories were computed using the structural plans provided by the UPLB Housing Division. Toilet flushing frequency per dormitory, which was used to estimate the toilet flushing demands, was obtained through surveys which were conducted in the 11 dormitories. A daily time-step and a constant flushing demand per dormitory were used in the simulations, which considered 88%, 90%, 92%, 95%, and 98% reliability of supply. Design parameters used in the simulations were consolidated into two new variables ? days of demand (DD) and dimensionless area units (DAU). DD indicates the tank size, while DAU indicates the theoretical maximum amount of rainwater that will be able to enter the tank. These two new variables were used to generate simplified equations for tank-sizing. Also, relationships of computed tank volumes and design parameters were determined. There was no pronounced correlation found between tank capacity and catchment area. However, positive linear relationships were found between tank capacity and water demand, as well as between the former and volumetric reliability.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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