NIM Green Stables: Passive Design for Animal Welfare

The Problem: Overheated Horses

As team leader for the NIM (National Invitational Mathematics) Green Stables project, I led a group tasked with solving a deceptively simple problem: horses in poorly designed stables overheat in summer, suffer respiratory issues from poor ventilation, and experience hoof problems from excessive humidity. The constraints were tight — no active air conditioning, limited budget, and a requirement that the design be replicable across different climatic zones.

We began with thermal physics. I modeled heat transfer through stable roofs and walls, calculating solar gain coefficients and natural convection rates. The data pointed clearly to passive strategies: reflective roofing materials, strategically placed vents exploiting the stack effect, and thermal mass walls that smooth day-night temperature swings. But the physics had to survive contact with reality — equine behavior, maintenance schedules, and construction costs.

Design Process

Our team iterated through six design variants, evaluating each against a multi-criteria matrix: thermal performance, animal welfare metrics, construction cost, and environmental footprint. The winning design combined a ventilated double roof with automated ridge vents, earth-bermed walls for thermal mass, and a slatted floor system that promoted natural air circulation while maintaining hoof health.

What I learned from NIM was not just about heat transfer. It was about leading a technical team where no single person had all the expertise. I coordinated between members specializing in structural engineering, veterinary science, and cost modeling. The result was a design that none of us could have produced alone — and a reminder that the best solutions emerge at the intersection of disciplines.