| ABSTRACT |
This project involves the conceptual design and engineering evaluation of a passive capillary irrigation
system for seedlings in tropical nursery environments. The work addresses limitations of conventional
irrigation containers, particularly material degradation, bulky structures, transportation difficulties and
inconsistent water supply. The design process begins with problem identification and root cause analysis
using an Ishikawa diagram to establish the technical requirements. TRIZ contradiction analysis and the
contradiction matrix are then applied to develop solutions that balance water storage capacity, structural
strength, material usage and ease of transportation.
The proposed system integrates a tiered water reservoir, rainwater catchment cover, central planting
cylinder and capillary wicking conduits. A modular, foldable structure with snap-fit connections and living
hinges enables compact storage, transportation and assembly without tools. The design incorporates a
PBAT/PLA biopolymer blend and a geotextile wicking medium to support passive water delivery without
pumps or electricity. The work includes three-dimensional CAD modelling, finite element analysis to
assess structural behavior under the specified loading conditions, and hydraulic calculations to estimate
reservoir capacity and watering duration. Injection molding simulations evaluate filling behavior and
potential manufacturing defects, while a preliminary bill of materials estimates raw material costs.
The main output is a conceptual irrigation design supported by engineering simulations, hydraulic
estimates and a preliminary manufacturing assessment. These provide a basis for subsequent prototype
fabrication and experimental validation of irrigation performance, durability and usability.
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