As data centre cooling demands intensify, heat-transfer efficiency has become critical to performance, sustainability, and cost control. This session takes a practical deep dive into how brazed plate heat exchangers can optimise cooling systems and improve overall efficiency. Attendees will explore the key factors that influence heat-transfer performance, including temperature approach, pressure drop optimisation, exchanger design characteristics, and the role of fluid properties. The session will also demystify LMTD, heat-transfer surface area, and the impact of fouling over time, equipping operators and engineers with actionable insights to design and run more efficient, resilient cooling infrastructure.