Title : Passive, low-energy infrastructure for heat-resilient rural health systems: A co-designed pilot and national guidelines framework for health training, accommodation and clinical spaces in Zambia
Abstract:
Zambia’s low-lying river-valley districts are climate hotspots, with daily maxima of 38–42 °C in the September–November hot season. In Nyimba, Gwembe, Sinazongwe and Shang’ombo districts, uninsulated corrugated-iron buildings, load-shedding and chronic housing deficits push indoor temperatures above 38 °C in maternal wards, laboratories and dormitories. These conditions degrade clinical care, constrain training capacity and drive health worker attrition (35% annually in Nyimba). At the Nyimba anchor site, mean unmitigated indoor temperature is 37.2 °C and over 65 days a year exceed 35 °C, projected to rise 18% by 2040.
This paper presents the design and evaluation framework of a 36-month co-designed initiative led by SolidarMed Zambia with the Ministries of Health; Infrastructure, Housing and Urban Development; and Green Economy and Environment. It tests whether passive, grid-independent retrofits can mitigate heat stress across three domains: health training colleges, staff and student housing, and clinical practice areas. Interventions combine high-thermal-mass envelopes of locally produced interlocking stabilised soil blocks, cool roofs (Solar Reflectance Index ≥ 78) with ventilated double-layer assemblies, passive air exchange (earth-air heat exchangers, solar chimneys, wind catchers) and nature-based shading.
Performance will be assessed through IoT sensor networks logging temperature, humidity, globe temperature and air velocity every 15 minutes across treatment, control and outdoor sites over two seasonal cycles, a 300-person occupant survey using the ASHRAE 55 adaptive comfort model, and a difference-in-differences regression. Design targets are an indoor temperature reduction of at least 5.5 °C without powered cooling and indoor WBGT below 28 °C when outdoor temperatures exceed 38 °C. Validated designs will be codified in an open-source National Guidelines Framework and replicated in three further districts. A 25% minimum female participation target in construction roles is built in. The approach offers a low-cost, scalable model for climate adaptation in health infrastructure, supporting SDGs 3, 4, 9, 11 and 13.
Keywords: heat resilience; passive cooling; climate adaptation; health infrastructure; thermal comfort; Zambia; nature-based solutions
