Objective 07: Heat Balance Analysis

Question 1

Heat Balance

Answer 1

Schematic flow diagram for a thermal power cycle on which thermodynamic properties and mass flow are indicated for all major flow streams in the power cycle

Question 2

How are Heat Balance Diagrams produced?

Answer 2

Detailed calculations apply the laws of conservation of mass and energy to each component in the power cycle and includes the manufacturer’s expected performance

Question 3

What do Heat Balance calculations determine?

Answer 3

1. Flow rates and thermodynamic properties of the fluids (pressure, temperature, enthalpy, and entropy) for all components of the cycle
2. Overall performance (efficiency and output) of the cycle

Question 4

What is the first thing that Heat Balance calculations are used for?

Answer 4

To design the thermodynamic performance of power cycles

Question 5

What is prepared along with Heat Balance diagrams?

Answer 5

Studies for sizing, selecting, and optimizing the equipment in the cycle

Question 6

Are Heat Balance diagrams prepared in one go?

Answer 6

No

Question 7

What do the several stages in which Heat Balance diagrams are prepared represent?

Answer 7

Several levels of refinement as the cycle is developed

Question 8

Turbine Vendor Balance

Answer 8

The Heat Balance provided by the Steam Turbine manufacturer for the components they provide, e.g. the turbine and feedwater system

Question 9

How precise can the Turbine Vendor Balance be if the vendor does not supply all the related process equipment under the scope of their contract?

Answer 9

The Heat Balance can only be approximated by using nominal performance values