What is the purpose of heat exchangers in mechanical systems?

Heat exchangers play a crucial role in mechanical systems primarily by facilitating the transfer of heat between two or more fluids without allowing them to mix. This method of heat transfer is essential in many applications, ranging from industrial processes to HVAC systems, where the efficient management of temperature is critical.

One of the key benefits of heat exchangers is their ability to optimize thermal energy usage. By transferring heat from a hotter fluid to a cooler one, they can maintain desired temperature levels, improve system efficiency, and minimize energy loss. This function is vital in conserving energy resources and enhancing performance across various mechanical systems.

While other choices may touch on aspects of heat management, the unique capability of heat exchangers to transfer heat effectively without mixing fluids is what solidifies option B as the most accurate representation of their purpose in mechanical systems.