Mechanical Science Heat Exchangers
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A heat exchanger that condenses vapor into liquid
The process of heat transfer between interacting adjacent molecules of the material through which the heat is being transferred.
The transfer of heat by a process of bulk motion and mixing of macroscopic portions of a fluid
A flow pattern in a surface heat exchanger in which two fluids flow in opposite directions; also called reverse flow.
A flow pattern in a surface heat exchanger in which one fluid flows at right angles to another fluid.
A heat exchanger in which two fluids come in contact and mix with each other.
Direct contact heat exchanger
A heat exchanger that functions to pre-heat feedwater prior to the reactor
A device that is designed to transfer heat from one fluid to another
A heat exchanger in which the two fluids are separated by a solid surface; also called a surface heat exchanger
Indirect contact heat exchanger
The change in enthalpy required for a substance at a given pressure and temperature to change from a vapor to a liquid.
Latent heat of condensation
A flow pattern in surface heat exchangers in which two fluids flow in the same direction.
A flow pattern in a surface heat exchanger in which two fluids flow in opposite directions; also called counter flow.
Heat which results in a temperature increase in the substance to which it is added
The outer casing of a heat exchanger
A type of surface heat exchanger that uses tubes and tube sheets to separate the two fluids in the shell.
Shell and tube heat exchanger
The fluid that flows around the outside of the tubes of a shell and tube heat exchanger.
Shell side fluid
A change in temperature that induces excessive thermal stress on heat exchanger components.
The fluid in a shell and tube heat exchanger that flows through the tubes.
Tube side fluid
A mechanical device used to remove non-condensable gas from a condenser.
Vacuum pump (Hogger)
A condition that occurs when the velocity of a fluid suddenly changes and impacts on pipe bends or component restrictions.
STATE the two types of heat exchanger construction.
- surface (non-mixing)
- direct contact (mixing)
LIST at least three applications of heat exchangers
- Feedwater heaters
Single-pass versus multi-pass heat exchangers.
- Single pass has only one path for the shell and the tube
- Multi Pass has multi pass for either the tube or shell or both
Regenerative versus non-regenerative heat exchangers
- A regenerative heat exchanger is one in which the same fluid is used as the
- cooling fluid and the cooled fluid.
- In a Non-Regenerative Heat Exchanger (NRHX), the hot fluid
- is cooled by a colder fluid, which is supplied by another system where the heat
- is eventually transferred to a heat sink.
STATE precautions associated with startup and shutdown of heat exchangers
- Cold side should also be filled and vented before adding the hot side during startup
- During shutdown the hot side should be removed first and then the cold
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