Heat Transfer | Derive Expression for LMTD | Parallel Flow Heat Exchanger | Basics | Telugu Lecture

Heat Transfer | Derive Expression for LMTD | Parallel Flow Heat Exchanger | Basics | Telugu Lecture
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Heat exchangers are devices designed to efficiently transfer heat from one fluid to another fluid, without the fluids coming into direct contact. They are widely used in various industries for heating, cooling, and energy recovery processes. Heat exchangers can be classified based on several criteria:
Operating Principle:
Direct Contact Heat Exchangers: In these heat exchangers, the fluids come into direct contact with each other.
Indirect Contact Heat Exchangers: The fluids are separated by a barrier, typically a solid wall or plate.
Flow Arrangement:
Parallel-Flow Heat Exchangers: Both fluids move in the same direction, parallel to each other.
Counterflow Heat Exchangers: Fluids flow in opposite directions to each other.
Crossflow Heat Exchangers: Fluids flow perpendicular to each other.
Construction:
Shell and Tube Heat Exchangers: These consist of a shell (outer vessel) containing multiple tubes through which one fluid flows, while the other fluid flows over the tubes inside the shell.
Plate Heat Exchangers: These consist of multiple plates stacked together, allowing for efficient heat transfer between fluids.
Finned Tube Heat Exchangers: These have tubes with fins attached to increase the heat transfer surface area.
Spiral Heat Exchangers: Fluids flow in a spiral pattern, allowing for compact design and efficient heat transfer.
Fluid State:
Single-phase Heat Exchangers: Both fluids remain in the same phase (e.g., liquid-liquid, gas-gas).
Two-phase Heat Exchangers: One or both fluids undergo a phase change (e.g., condensation, boiling).
Application:
Air-to-Air Heat Exchangers: Used for transferring heat between air streams.
Liquid-to-Liquid Heat Exchangers: Used for transferring heat between liquid streams.
Gas-to-Liquid Heat Exchangers: Used for transferring heat between gas and liquid streams.
Specialized Designs:
Regenerative Heat Exchangers: These capture and store heat during one part of the operating cycle for use in another part.
Compact Heat Exchangers: Designed for high efficiency and small footprint, often used in space-constrained applications.
Phase-change Heat Exchangers: Specifically designed for applications involving phase changes, such as condensation or evaporation.
These classifications provide a framework for understanding the diverse range of heat exchangers used across industries, each optimized for specific operating conditions and performance requirements.
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