Why does Discharge Superheat Matter?

[@HVACTIME]

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[@stevencossaboon3237]

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[@kenfewell4200]

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[@jasonjohnsonHVAC]

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[@aleonyohan6745]

Dude you are amazing. We built a custom 15 ton air-cooled chiller to go into a salt mine in Northern Canada. Ambient temperature in the mine will be about 115F they raised the load temperature from 80F to 105F I'm running a Bitzer scroll with 407c. My discharge pressure is 440 PSI my discharge line temperature is 225F my suction superheat is about 50F. My TXV is backed all the way out. I could handle the high ambient but the increase in high load is overwhelming my brazeplate evaporator. To top it off my condenser had to be sprayed with heresite and have a nylon screen over it. The compressor is so hot you can hardly hold your hand on the bottom side of it. I feel like the TXV is too small for this increase in load. This is the first I've heard of discharge superheat. Will definitely be getting that number in the morning. I wish we could just go to standard EEV valves. We're just having a hard time incorporating our Schneider plc with the Schnieder EEV driver. I have been pushing for engineering to oversized the EEV a little bit so that I don't starve the evaporator under these high load conditions. They seem to want to size the eev for set point or a low load situation. But then I am 100% open on the EEV but still starving my evaporator at high load. I feel like this EEV stepper motor would still be accurate at low load even if the valve was only say 12% open.

[@HVACTIME]

You could set it up with liquid injection for cooling the compressor a bit at peak loads because at those numbers your compressor won't last. If you'd like deeper support I have a Chiller Community where i offer troubleshooting support to those enrolled in an Academy course. chilleracademy.com

[@aleonyohan6745]

@@HVACTIME yeah I'm definitely going to enroll. Yeah the customer and our engineers want it to work, but the numbers don't lie. Compressor death for sure. I hate when they ask me what I think and I have to give them the bad news. I said do you want me to be optimistic or do you want me to be honest.

[@symbionese2348]

Superheat means to me a condition in which a fluid has been heated to such a temperature under such a pressure as to make the vaporous state and liquid state of that fluid equal in weight. Is refrigerant increased to such a density after being pushed by the compressor? If so, how is that measured? How would a system have superheat in the low pressure side when the refrigerant is being suctioned, not pressurized?

[@HVACTIME]

Superheat is the sensible heat gained above saturation temperature.