Definition check – What is a heat exchanger? Confirm whether the statement “A device used for transferring heat from one fluid to another” correctly defines a heat exchanger.

Introduction / Context:
Heat exchangers are ubiquitous in HVAC, power, chemical processing, and refrigeration. A clear definition underpins proper selection among shell-and-tube, plate-and-frame, finned-tube, condensers, evaporators, and regenerative devices.

Given Data / Assumptions:

• Two or more fluids at different temperatures exchange heat.
• Heat transfer may be with or without phase change (sensible or latent).
• Fluids can be kept separate (indirect contact) or mixed (direct contact towers).

Concept / Approach:
A heat exchanger is any device facilitating heat transfer between fluids separated by a wall (indirect contact) or in direct contact without significant external work. The definition does not mandate a particular flow arrangement or phase change.

Step-by-Step Solution:
Match the statement to standard definitions.Recognize inclusivity: condensers, evaporators, economizers, oil coolers, air heaters, and cooling towers fit.Therefore the statement is correct.

Verification / Alternative check:
Texts define heat exchangers broadly; specialized names (condenser, boiler) are specific applications but still heat exchangers by function.

Why Other Options Are Wrong:

• Limiting to direct contact, requiring phase change, or restricting to counter-flow excludes many legitimate devices.

Common Pitfalls:
Equating “heat exchanger” only with shell-and-tube; forgetting that regenerative and recuperative devices are included; mixing “heater” and “exchanger” terminology.

Final Answer:
True