A chiller which is condensed using air and works with a screw compressor has not been working to the expected efficiency. Mostly because of an increased temperature in the summer. One way is to install a heat exchanger passing through the outlet of the evaporator and condenser. Will this actually increase the efficiency? The refrigerant is R134A, and volume of water being cooled in the evaporator is 400 m^3. Normally we want the water to be cooled from 14 to 9 but it just reduced the temperature to 12.
I would appreciate a direct calculation of heat transfer of a heat exchanger if we installed one.
I am open to any other suggestions in this regards.
Dear Keivan Mohammadi
The problem is the increased temperature of the condenser.
you'd better find a way to cool down the condenser much better in summer. using the cooling capacity of the evaporator for improving the condenser capacity does not seem a logical way. spraying water on the condenser pipes may be a better way. however, it increases water consumption.
Dear Keivan Mohammadi :
I'm not sure if the following information might be helpful, principally because the calculations part you mentioned in your question:
Have you already checked the free-licensed software Coolselector2 from Danfoss ? You can perform calculations with chillers and components from different capacities and kinds. It is indeed an interesting tool.
And it's available for free at the Danfoss' official website:
https://www.danfoss.com/en/service-and-support/downloads/dcs/coolselector-2/
Best Luck ! :)
Normally the efficiency of a refrigeration system is lower in summer time, when the gap between condensation and evaporation temperatures is higher. The first option for a system, already designed, is always clean the heat exchangers and filters. of course a water condenser increase the efficiency but its more expensive investment.
Thank you in advance for sharing your ideas and for the free software that was proposed. I will definitely try that one too.
I found a way to increase the heat transfer in the air-cooled condenser with a considerably lower amount of water consumption. First, the fins of the condenser must be cleaned. One heat exchanger has already been implemented and using another one wouldn't seem logical. Then a misting system will be added to the environment of the condenser to reduce the dry-bulb temperature as close as possible to the wet-bulb temperature. This would, in turn, help the condensation. I would appreciate scholars' ideas on this.
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