Electrical Calculations Vol 3

Synopsis:

The book demonstrates to the electrical engineer on how to perform energy efficiency calculations. These include the barycentre method, transformer comparison, motor efficiency, power factor correction, lighting comparison, lighting paybacks, environmental impact, compressed air pressure reduction, VSD saving, etc.

The book is presented in a Q&A format for ease of understanding and application.

The full list of topics covered are reflected in the table of contents. A snippet of a section of the book is also included.

 

Table of Contents

1. List of figures. iv
2. List of tables. iv

iii.   SI units basic. v

1. Derived units. v
2. Accepted non-SI units. vi
3. Electrical formulas. vi

vii.      Standard electrical unit of measure. vii

viii.     Multiples and sub multiples. vii

1. Barycentre method. 1
2. Motor efficiency by switch off method. 5
3. Motor efficiency by utilising energy efficient model 7
4. Immersion element 9
5. Water heating by immersion element 9
6. Transformer upgrade. 10
7. Transformer comparison. 11
8. Transformer operational efficiency. 11
9. Comparison of transformers. 12
10. Transformer comparison. 13
11. Lighting lamp comparisons. 14
12. Simple lighting payback analysis. 16
13. Lighting system with controls simple payback. 17
14. Lighting environmental impact 18
15. Compressed air energy saving by pressure reduction. 19
16. Variable speed drive control for HVAC system.. 20
17. Power factor correction for induction motor. 21
18. Power factor correction on an alternator. 21
19. Power factor correction. 22

 

 

 

       i.            List of figures

Figure 1: Equipment layout in commercial kitchen. 2

Figure 2: Optimum placement of distribution board. 3

 

     ii.            List of tables

Table 1: Annual energy consumption of commercial kitchen project 1

Table 2: Annual energy consumption of load with co-ordinates. 4

Table 3: Motor efficiency classes. 5

Table 4: Motor efficiency by switch off method. 6

Table 5: Motor efficiency by utilising an energy efficient class model 8

Table 6: Dry type transformer comparison cost calculator. 11

Table 7: Transformer Tier 1 and 2 comparison. 13

Table 8: Lamp technology comparisons. 15

Table 9: Simple lighting payback. 16

Table 10: Lighting system with controls. 17

Table 11: Lighting system environmental impact 18

Table 12: Compressed air pressure reduction savings. 19

Table 13: Fans control ratio. 20

Table 14: Pump control ratio. 20