Question

Device used for exchange of heat between two fluids

• A. Heat engine
• B. Heat exchanger
• C. Extruder
• D. Irradiator

Hint:

Heat Exchanger $\rightarrow$ Heat transfer between fluids ($q = UA\Delta T_{\text{LMTD}}$).
Heat Engine $\rightarrow$ Converts heat to mechanical work.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Thermal equipment classification is based on whether the device converts heat into mechanical work, transfers heat between fluid streams, or applies radiation.
Key Formula or Approach:
\[ q = U \cdot A \cdot \Delta T_{\text{LMTD}} \]

Step 2: Detailed Explanation:
1. Heat Exchanger: A thermal device (such as shell-and-tube, plate, or double-pipe) engineered to transfer heat efficiently between two or more fluids at different temperatures across a solid conducting boundary without physical fluid mixing.
2. Heat Engine: Converts thermal energy into mechanical work (e.g., IC engine, steam turbine).
3. Extruder: High-pressure screw device for forming and cooking doughs.
4. Irradiator: Exposes materials to ionizing radiation for sterilization.

Step 3: Final Answer:
Therefore, the device used for exchange of heat between two fluids is a Heat exchanger, corresponding to option (B).