Heat transfer

Question 1

Thermodynamics

Answer 1

The transformation of heat to and from other forms of energy, and with the laws governing such conversions Refers to the entire system of doing work by the transfer of heat

Question 2

Heat Transfer

Answer 2

How heat actually moves around and the actual materials that are re used to move such heat

Question 3

Internal Energy and Temperature are related___?

Answer 3

Internal energy of molecules of a substance is directly proportional to temperature

Question 4

What happens to nearly all materials when the temperature rises?

Answer 4

Nearly all materials expand when their temperature is raised and shrink when it is lowered

Question 5

Temperature

Answer 5

A measure of the average kinetic energy of the particles in matter

Question 6

Heat

Answer 6

The energy transferred between matter as a result of differences in temperature

Question 7

How do bimetallic strips work?

Answer 7

Bimetallic strips bend because one of the metals expands more than the other when heated, causing the strip to curve toward the metal with the lower expansion rate.

Question 8

Boyle’s Law

Answer 8

Volume decreases as pressure increases if temperature is the same.P1V1=P2 V2

Up/down

Question 9

Charles’ Law

Answer 9

Volume increase as temperature increase if pressure stays the same𝑉1/𝑇1=𝑉2/𝑇2

Up/ up

Question 10

Combined, Ideal, and Real Gas Laws

Answer 10

Deals with pressure, temperature, and volume

Question 11

Heat moves from___ to ___

Answer 11

Heat always moves from hot to cold.

Question 12

Conduction

Answer 12

Transfer of heat through contact Transfers based off a difference in temperature the transfer of energy from molecule to molecule by collisions Example like a metal spoon heating up in a hot cup of coffee.

Question 13

Convection

Answer 13

The transfer of energy by the flow of a liquid or a gasexample: heating a room with a radiator

Question 14

Radiation

Answer 14

The transfer of energy by electromagnetic waves.Example sun warming the earth

Question 15

A good conductor

Answer 15

Copper

Question 16

Calorie

Answer 16

The amount of heat necessary to raise the temperature of 1 gram of water one degree Celsius.

Question 17

Specific heat

Answer 17

The quantity of heat required to raise the temperature of a given amount of a substance by one degree

Question 18

Thermal Conductivity (k)

Answer 18

The ability or rate of a specific material to conduct heat per unit of time

Question 19

Material Thickness

Answer 19

The rate of heat transfer is directly proportional to the area available for heat transfer and inversely proportional to the thickness

Question 20

Phase Change or Change of phase

Answer 20

The transformation of matter from one state to another.

Question 21

Sensible Heat

Answer 21

The heat added to or removed from a substance to produce a change in temperature.

Changes you can sense

example is heating up a metal rod

Question 22

Latent Heat

Answer 22

The amount of heat added to or remove from a substance to produce a phase change.

Question 23

Evaporation

Answer 23

Happens more quickly at higher temperatures and slower at lower temperatures

boiling is a rapid evaporation.

Question 25

Condensation

Answer 25

Vapor that turns into liquids

Question 25

Latent heat of fusion

Answer 25

The amount of heat required to melt of one gram of ice without producing any change in temperature.

Question 25

Latent Heat of Vaporization

Answer 25

The heat required to convert one gram of water to steam of its gaseous form

Question 26

Entropy

Answer 26

A measure of unavailable energy.

Question 27

Law of conservation of Energy

Answer 27

Energy cannot be created or destroyed; it may be transformed from one form to another, but the total amount of energy will never change.

Question 28

Heat Engine

Answer 28

A Device that converts thermal energy to other forms of energy such as mechanical and electrical energy.

Example car

Question 29

Parallel Flow Heat Exchanger

Answer 29

In a parallel flow heat exchanger, both fluids flow in the same direction.

Question 30

Fouling of the tubes in a heat exchanger

Answer 30

is caused by scale, corrosion, or biofouling (algae or fungi) on the surface of the tubes will decrease the heat transfer coefficient by affecting both the thermal conductivity and the thickness of the tubes.

Question 31

Water between 0-4C

Answer 31

Contracts

Question 32

Water between 4-0C

Answer 32

Expands