How Can I Calculate and Choose the Right Compressor for a Replacement?

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SUMMARY

The discussion focuses on the process of calculating and selecting the appropriate compressor for replacement in a vapor compression cycle system. The user has temperature and pressure readings from the evaporator, condenser, and valve, and has determined the coefficient of performance (COP) at various conditions. Key considerations include ensuring the new compressor's compression ratio aligns with the existing system to avoid inefficiencies, such as operating in the subcooled region. The conversation highlights the importance of precise calculations and understanding the existing system's specifications.

PREREQUISITES
  • Understanding of vapor compression cycle principles
  • Familiarity with compressor efficiency calculations
  • Knowledge of temperature and pressure measurement techniques
  • Experience with HVAC system components, including evaporators and condensers
NEXT STEPS
  • Research methods for calculating compressor compression ratios
  • Learn about selecting compressors based on existing system specifications
  • Study the impact of operating conditions on compressor efficiency
  • Explore HVAC system design considerations for optimal performance
USEFUL FOR

HVAC technicians, mechanical engineers, and anyone involved in the design or maintenance of vapor compression systems will benefit from this discussion.

P@ul
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Hello to everyone that reads this,

I have to replace an old compressor with a new one. The trick is that i need to calculate the everything about the new one before i put it in. So i can convince everyone that it's a smart choice. The vapor compression cycle will remain the same, will still utilize the evaporator, condenser and old valve. I have temperature/pressure readings at all of those spots. From that I've determined the cop throughout the cycle at various temperatures/pressures. Now i need to make sure that compression ratio of my new compressor will work in the that unit! How do i go about that? I've also calculated the efficiency of the compressor at all of those temperatures. I don't want to over shoot it and compress it to much before the condenser and then it'll be in the sub cooled region, which would make it useless, i think. So point being, anyone know where i should start and what i can set in stone with this new compressor

Thanks guys
 
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Welcome to PF!

This is an odd request. Typically a compressor replacement is pulled straight out of a catalog or selected by a sales engineer - there isn't anything for the purchaser to calculate.

Do you have the make and model of the existing condenser and its compressor?
 

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