USAID Enterprise Energy Efficiency – 3E Pilot Project Proposal No. B1-1

The building's facade has undergone renovation, but its outside walls remain uninsulated, resulting in significant heat losses. The current heating system, consisting of two 800 kW oil boilers, consumes 28,000 liters of light fuel oil annually, translating to 300 MWh of energy and an annual heating cost of 45,000 KM ($32,000). A comprehensive assessment of the building's energy efficiency potential has identified several key areas for improvement. The first recommendation is the replacement of existing windows, which are not thermally efficient and have a unique shape, requiring specialized manufacturing. The City of Mostar has already initiated a tender for their replacement, with a cost of $625/m2, significantly higher than the average cost of $200/m2. However, this additional cost is attributed to the preservation of the building's historical heritage. The current heating control system is manual, allowing for subjective adjustments by maintenance personnel. An automatic heating and boiler control system is recommended to optimize boiler water outlet temperature according to outdoor conditions. Additionally, motorized control valves will be installed to enable reduction of heat supplied to unused parts of the building, reducing energy waste. Thermostatic valves will be installed on all radiators, allowing for optimal thermal comfort and energy savings. The gym's heating system design is flawed, with radiators installed on metal chains, posing a hazard to students. Fan forced hot water unit heaters will be installed to replace these radiators, ensuring safety and effectiveness. These measures can be replicated in many schools, as most do not have advanced control systems installed. The City of Mostar is financing 90% of the project costs, demonstrating its commitment to the project and ensuring successful implementation. The proposed energy efficiency measures are expected to yield significant benefits, including a large LCD display at the school entrance, showcasing current and cumulative data on fuel oil consumption, CO2 emissions, and temperature. This display will serve as an educational and awareness tool, promoting energy efficiency and sustainability among students, teachers, parents, and visitors.