You’re right; temperature fluctuations and the stability of the heat source side are indeed key factors in the implementation of waste heat utilization projects. I checked the link provided by the original poster; the basic principles are explained quite clearly. However, when making a practical selection, in addition to considering COP and temperature difference matching, it is also necessary to take into account the corrosiveness of the waste heat medium or the risk of scaling. For example, in flue gas waste heat recovery, choosing the wrong material for the heat exchanger can lead to higher maintenance costs later on. Additionally, the disposal pathway for the waste heat after recovery is also important: if it is used for heating, the load curve remains relatively stable ; If generating power is to be connected to the grid, higher requirements are placed on the unit’s start-up, stop-up, and regulation capabilities. If the original poster could share more details about the operating conditions (such as the type of medium, temperature range, and patterns of load fluctuations), we can then discuss how to balance efficiency with long-term operational stability. Of course, it is best to determine the specific configuration by using the manufacturer’s selection tools as well as on-site measurement data, as there are significant differences in the temperature range tolerance among different brands.