Objective 01: Basic Properties of Water and Steam

Question 1

Why is there widespread use of steam?

Answer 1

1. Availability of Water

2. Relative safety of steam compared to other fluids

Question 2

Why is the use of water preferred over other more thermodynamically superior fluids?

Answer 2

It is much less hazardous

Question 3

What is the purpose of Steam Tables?

Answer 3

To show the thermodynamic properties of water and steam at certain pressures and temperatures

Question 4

How are values found that lie in between those listed in Steam Tables?

Answer 4

Interpolation

Question 5

Enthalpy

Answer 5

A thermodynamic quantity, equal to the internal energy of a system plus the product of its volume and pressure, that regards the heat transferred to or from a system that is needed to attain a certain final condition

Question 6

What determines the amount of heat required to convert water into steam?

Answer 6

1. Pressure

2. Temperature

Question 7

What is the more proper term for Sensible Heat added to a liquid?

Answer 7

Liquid Enthalpy or Enthalpy of Water

Question 8

What is the more proper term for Latent Heat added to liquid at saturation temperature?

Answer 8

Enthalpy of Evaporation

Question 9

Saturated Steam

Answer 9

Steam that is at the saturation temperature for the existing pressure

Question 10

Dry, Saturated Steam

Answer 10

Steam that has been converted 100% from water and is at saturation temperature

Question 11

Wet Steam

Answer 11

Steam that still contains some water

Question 12

Dryness Fraction

Answer 12

The proportion of steam in a water-steam mixture

Question 13

Superheat

Answer 13

Heat that increases the steam temperature above saturation temperature

Question 14

Critical Pressure

Answer 14

The pressure at which the density of water and steam is virtually the same, i.e. 22 090 kPa which corresponds to 374.136ºC

Question 15

Superheated Steam

Answer 15

Dry steam that is above saturation temperature