Cost Savings - Reducing Condenser Approach Temperature
Cost Savings - Reducing Condenser Approach Temperature
(OP)
We're considering some work to reduce the condenser approach temp. e.g 6°F to 1.6°F. In order to move forward I need to calculate the cost savings.
The system has a water-cooled centrifugal chiller. Can the cost savings be calculated by using site data e.g. gpm, temperatures, power cost? or, is there rule of thumb i.e. each 1°F change reduces power consumption xx% etc. Not quite sure how to approach this issue.
Can someone assist in calculating cost savings? Thanks.
The system has a water-cooled centrifugal chiller. Can the cost savings be calculated by using site data e.g. gpm, temperatures, power cost? or, is there rule of thumb i.e. each 1°F change reduces power consumption xx% etc. Not quite sure how to approach this issue.
Can someone assist in calculating cost savings? Thanks.





RE: Cost Savings - Reducing Condenser Approach Temperature
RE: Cost Savings - Reducing Condenser Approach Temperature
RE: Cost Savings - Reducing Condenser Approach Temperature
Deduct the extra energy you require for lowering the condenser approach.
RE: Cost Savings - Reducing Condenser Approach Temperature
quark - i would think the mcpdt equation can still describe an aspect of the situaion - the heat rejection stays the same then the mass flow increases(corresponding pressure increase)and refer DT decreases due to higher refregerant velocity.
Once the system discharge pressure increases the compressor lift becomes excessive and the centrifugal compressor goes into surge mode. At this point the heat rejection is at its max (not to mention the potential impellar damage). Make sense or do I have it backwards....?