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Becuase of the widespread application of air blowers, it becomes very important to have efficient & effective use of blowers.
Tremendous variety and specification of blower makes it difficult for engineer to understand, evaluate & determine the effectiveness and efficiency of particular blower installed in application.
Here we present you with process of evaluating the performance of existing blower, check for the scope of energy saving and cost reduction.
Many times during the working, specifications of blower is changed by changing the fan speed or impeller etc. (This may be done becuase of change in process requirement or using the blower for some different application) So it is recommended to actualy carry out complete performance test of the blower and determine the performance based on performace test. This will eliminate any possibilites of mistake arising for misleading / wrong information about particular blower. To understand about blower testing and performance curve read article
Now you can find out the air flow at operating point using
a. Value of Static Pressure & Current at operating point &
b. tracking it for correspoinding flow on Operating Characterstic Curve.
It may happen that there is 10 to 15% diffrence between actual static pressure drop measured and theoroticaly calculated static pressure drop. This is acceptable (& is normaly adjusted in factor of safety). The exercise give you idea about how the pressure drop is added across the system.
There are two inverse cost implications while designing the blower system
a. We can reduce the initial cost by reducing duct sizes. This will add pressure drop hence running cost will increase.
b. We can reduce the running cost of blower by increasing the duct sizes. This will increase the initial cost of system.
Now that you know the pressure drop of your systems ask yourself following
a. What can you do to reduce the pressure drop of system?
b. Can you increase the duct sizes?
c. What will be the static pressure drop if you increase the duct size?
d. What will be the cost of changing the duct size?
e. What will be cost of renovating/ replacing blower to match new operating condition
f. What wil be energy saving in 5years (decide time period based on duct life)
g. How much days/ months/ years will be require to recover the cost of changing duct.
Working on above questiongs will give you good idea about the prospects of energy cost reduction in your blower system.
a. After doing exercises from point 1 to point 4 you will be in position of information about efficiency of your blower at operating point.
b. Consult with blower manufacturers about what better
efficiency they can provide for the same operating point.
c. What is the cost of new (more efficient blower)
d. What is the energy saving from new blower.
e. Calculate how many years will be required to recover the cost of new blowers by the energy saving provided by new blower.
If you are getting good return than you can decide for
replacing the blower imediately.
Or you can wait for the existing blower to worn out and then be replaced by more efficient one based on above given information.
ENERGY SAVING OPPORTUNITIES
|Energy Saving / Cost Reduction|