Evaporator Approach is the difference between the evaporating refrigerant temperature - measured at the well in the evaporator -
and leaving chilled water temperature.
Take all readings with the water cooled chiller at full load.
Condenser Approach is the difference between the liquid refrigerant temperature - as measured on the liquid line - and leaving condenser water temperature.
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It depends on if you are running it fully all the time. Many things affect the energy consumption of a chiller...The condenser water temperature, the current load in the building..etc. The compressor is what uses the most energy, so if you can minimize the work the compressor has to do by decreasing the condenser water temperature (doing this forces you to use more energy on the cooling tower fan) then your chiller will use less energy. Building automated controls weigh the pros and the cons and do constant optimization to decided which uses more energy in this handoff
channel 130
You have to buy it from the donut shop with 40 cyberberries.
At the top section of the condenser.
You need to specify the approach that you want to be explained.