Testing a Heat Recovery System for a Gas Engine Cogeneration System Simultaneously Generating Steam and Hot Water

: This study aimed to develop a heat recovery system for a 1-MW-class cogeneration system with a gas engine. The system recovers heat from two engine components-jacket - jacket water and exhaust gas. A plate-type heat exchanger captures heat from the jacket water, contributing to room heating and hot water supply. Additionally, the exhaust gas heat is harnessed to generate steam. Both heat recovery devices were subjected to 1/5-scale experiments, and the results were compared against empirical correlations used for designing thermal systems. The thermal efficiency of the plate-type heat exchanger decreased by up to 30% at 50% engine load. Thus, although its heat transfer accuracy varied by up to 50% based on fin density changes, the proposed modular evaporator exhibited good performance.