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[bobk97]

Hi everyone,

 

First of all I am fairly new to industrial refrigeration systems, I am doing a engineering study.

 

I am working on a graduation thesis in industrial refrigeration. The project is about a standardized evaporator valve station for an ammonia system. The system is based on R717 pumped-overfeed evaporators with hot-gas defrost.

 

The valve station is divided into four functional sections:

 

• Liquid Feed
• Wet Return
• Hot Gas Defrost
• Defrost Drain

 

The goal is not to certify a real installation, but to prove in my thesis that the proposed P&ID is functionally plausible and can operate in different modes, such as:

 

• normal cooling
• part-load operation
• pump-down / isolation before defrost
• hot-gas defrost
• defrost drain / pressure equalisation
• return to cooling

 

I am struggling with how to prove this properly to my tutor. I can make calculations for mass flow, pressure drop and Kv values, and I can compare component sizing with Danfoss Coolselector². I can also make an operating-mode matrix that shows which valves are open or closed in each mode.

 

However, I do not have a real installation available for live testing, and even then there are no inline flow meters in the system.

 

My question is:

 

What would be a technically acceptable way to validate this kind of P&ID for a graduation thesis?

 

I am especially interested in how engineers normally prove that a valve arrangement is functionally correct before it is built or commissioned.

 

Any help would be greatly appriciated!