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

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The discussion centers on the replacement of an old compressor with a new one, emphasizing the need for careful calculations to ensure compatibility with the existing vapor compression cycle, which includes the evaporator, condenser, and valve. The user has gathered temperature and pressure readings and calculated the coefficient of performance (COP) at various points in the cycle. A key concern is ensuring that the compression ratio of the new compressor aligns with the system's requirements to avoid issues like subcooling, which could render the compressor ineffective. The conversation highlights that typically, compressor replacements are straightforward, often relying on catalog selections or sales engineers, suggesting that the user may need to provide specific details about the existing system for better guidance.
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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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