AREA III - Heat Transfer

Question 1

The driving potential for heat propagation

Answer 1

Temperature difference

Question 2

It is the only mechanism by which heat can flow in opaque solids.

Answer 2

Heat Conduction

Question 3

The relative capacity of a material to conduct heat

Answer 3

conductivity

Question 4

States that the rate of heat transfer across any plane normal to the x direction, Qx, is proportional to the wall area, A, and the temperature gradient in the x direction, dT/dx

Answer 4

Fourier’s law

Question 5

Occurs when heat moves from one place to another by means of currents that are set up within some fluid medium.

Answer 5

Heat Convection

Question 6

The rate of energy transfer from the surface to the air

Answer 6

Newton’s Law of Cooling

Question 7

Occurs in the form of a wave motion similar to light waves wherein the energy is transmitted from one body to another without the need for
intervening matter.

Answer 7

Thermal Radiation

Question 8

ratio of rate at which a given surface absorbs radiation to the rate of radiation of a black body at the same temperature

Answer 8

Absorptivity of a Surface

Question 9

temperature of surrounding medium

Answer 9

Ambient Temperature

Question 10

Hypothetical body capable of absorbing all radiation at the maximum rate for a given temperature

Answer 10

Black Body

Question 11

Expressed as the ratio at which the given surface emits radiation to the rate of radiation of a black body at the same temperature.

Answer 11

Emissivity of a Surface

Question 12

It is a property of state; is the sum of internal energy of a substance and its pressure - specific volume of product at the given state.

Answer 12

Enthalpy

Question 13

It is the form of energy that provides differences in the temperature of molecular
materials.

Answer 13

Heat

Question 14

It is the difference between the heat gained (or generated) within the building and the entire heat test from the building

Answer 14

Heat Balance

Question 15

Refers to the ratio of the heat capacities of the material to that of water

Answer 15

Heat Capacity or Specific Heat

Question 16

It is the heat gained or lost without a change in temperature when a substance passes
from one state to another as a solid, liquid, or gas.

Answer 16

Latent Heat

Question 17

It is the change of heat (energy) required to change unit mass of a substance from a liquid to a gas.

Answer 17

Latent Heat of Evaporation

Question 18

The heat energy required to raise the temperature of unit mass of a substance by 1°C.

Answer 18

Specific Heat

Question 19

volume of space occupied by a pound of dry air at standard atmospheric pressure.

Answer 19

Specific Volume

Question 20

Ability of a body to give up or to receive heat

Answer 20

Temperature

Question 21

The amount of heat transmitted in unit time across unit area through unit thickness for unit temperature change

Answer 21

Thermal Conductivity