Chapter 11 Flashcards Preview

Process Tech > Chapter 11 > Flashcards

Flashcards in Chapter 11 Deck (46)
Loading flashcards...
1

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.

Backwashing

2

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.

Baffle

3

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)

4

The amount of heat energy required to raise the temperature of 1 g of water by 1°C at sea level.

Calorie

5

Flow that occurs when two fluids are flowing in the same direction.

Co-current flow

6

An exchanger used to convert a substance from a vapor to a liquid.

Condenser

7

The transfer of heat from one substance to another by direct contact.

Conduction

8

The transfer of heat as a result of fluid movement.

Convection

9

Occurs when two streams flow perpendicular (at 90° angles) to each other.

Cross flow

10

Located on the end of a heat exchanger, it directs the flow of fluids into and out of the tubes.

Exchanger head

11

Accumulation of deposits (such as sand, silt, scale, sludge, fungi, and algae) built up on the surfaces of processing equipment.

Fouling

12

The transfer of energy from one object to another as a result of a temperature difference between the two objects.

Heat transfer

13

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.

Interchanger

14

A streamline flow that occurs when the Reynolds number is low (at very low fluid velocities).

Laminar flow

15

Occurs in a heat exchanger when the shell flow and the tube flow are parallel to one another.

Parallel flow

16

A heat exchanger that adds heat to some substance prior to a process operation.

Preheater

17

The transfer of heat through electromagnetic waves (example warmth emitted from the sun).

Radiation

18

A tubular heat exchanger, placed at the bottom of a distillation column or stripper, that is used to supply the necessary column heat.

Reboiler

19

A number used in fluid mechanics to indicate whether a fluid flow in a particular situation will be smooth or turbulent.

Reynolds number

20

The outer casing, or external covering of a heat exchanger.

Shell

21

The measure of the thermal energy of a substance (example the "hotness" or "coldness") that can be determined using a thermometer.

Temperature

22

A group of fixed, parallel tubes though which process fluids are circulated.

Tube bundle

23

A formed metal plate with drilled holes that allows process fluids to enter the tube bundle.

Tube sheet

24

flow that occurs when a dimensionless number (Reynolds number) is above 10,000 (at high velocities).

Turbulent flow

25

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 exchangers

26

Heat can be transferred through conduction, convection, or radiation. However, the primary modes of heat transfer in the process industries are:

conduction and convection

27

1BTU is equivalent to:

252 calories

28

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!

29

Heat is commonly transferred by three methods:

conduction, convection, and radiation

30

Example of conduction

frying pan