Flashcards in Chapter 11 Deck (46)
A procedure in which the direction of flow through the exchanger is reversed to remove solids that, for example, have accumulated in the inlet tubes of a heat exchanger.
A metal plate that is placed inside a vessel or tank and is used to alter the flow of chemicals, facilitate mixing, or cause turbulent flow.
A measure of energy in the English system, referring to the heat required to raise the temperature of 1 pound of water 1°F at sea level.
British thermal unit (BTU)
The amount of heat energy required to raise the temperature of 1 g of water by 1°C at sea level.
Flow that occurs when two fluids are flowing in the same direction.
An exchanger used to convert a substance from a vapor to a liquid.
The transfer of heat from one substance to another by direct contact.
The transfer of heat as a result of fluid movement.
Occurs when two streams flow perpendicular (at 90° angles) to each other.
Located on the end of a heat exchanger, it directs the flow of fluids into and out of the tubes.
Accumulation of deposits (such as sand, silt, scale, sludge, fungi, and algae) built up on the surfaces of processing equipment.
The transfer of energy from one object to another as a result of a temperature difference between the two objects.
A process to process heat exchanger. Interchangers use hot process fluids on the tube side and cooler process fluids on the shell side. Also known as cross exchanger.
A streamline flow that occurs when the Reynolds number is low (at very low fluid velocities).
Occurs in a heat exchanger when the shell flow and the tube flow are parallel to one another.
A heat exchanger that adds heat to some substance prior to a process operation.
The transfer of heat through electromagnetic waves (example warmth emitted from the sun).
A tubular heat exchanger, placed at the bottom of a distillation column or stripper, that is used to supply the necessary column heat.
A number used in fluid mechanics to indicate whether a fluid flow in a particular situation will be smooth or turbulent.
The outer casing, or external covering of a heat exchanger.
The measure of the thermal energy of a substance (example the "hotness" or "coldness") that can be determined using a thermometer.
A group of fixed, parallel tubes though which process fluids are circulated.
A formed metal plate with drilled holes that allows process fluids to enter the tube bundle.
flow that occurs when a dimensionless number (Reynolds number) is above 10,000 (at high velocities).
Devices that are used to transfer (exchange) heat from one substance to another without the two process fluids physically contacting each other. Without this many processes could not occur properly.
Heat can be transferred through conduction, convection, or radiation. However, the primary modes of heat transfer in the process industries are:
conduction and convection
1BTU is equivalent to:
The term calorie, with a capital C found on food labels and in diet books is really 1,000 of the calories referred to in this chapter. That means one BTU is actually equivalent to:
252,000 of the calories we eat!
Heat is commonly transferred by three methods:
conduction, convection, and radiation