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The TXV is designed to maintain a certain level of superheat but we don't know that the TXV is operating properly necessarily and we don't know what the design capacity of the system is. Its possible that the heat load could get so great that even with the TXV wide open there is not enough...

Outdoor temperature was approximately 105 deg F. From the part you quoted me - what I was saying was that in order for a fully flooded evaporator (0 deg superheat) to be 40 degrees the pressure inside it would need to be 35PSIG with R134A. Gruntguru - Why assume that the bulk of the evap is...

3DDave thanks for those resources I am going to read through them now.

I don't have my pressure sensors hooked up anymore, but running in low gear (cruising about 3000 RPM instead of usual 1500-2000RPM) doesn't seem to make any noticeable difference in cool down. I also evacuated and recharged the system by weight just to be sure the charge level is correct and the...

No sudden changes in low side pressure. I have a datalog that I will attach to this post. This was about 15 minutes worth of driving and you can see the vent temp never actually went below 45 degrees. The high side pressure correlates mildly to driving conditions. Goes up when vehicle...

miningman (Mining)21 Aug 21 19:52 If it were me , the first thing to examine would be the diameter of the lines to / from the compressors. The larger the diameter the more refridgerant can be moved with equal sized HVAC systems in the two vehicles. If the line diameter were too small as you...

GregLocock (Automotive) I agree with you totally. What I want to do is increase the capacity of my system since it seems I am exceeding what it was designed to do. Unfortunately they have to make cars that work all over the world for all different climates so they are not going to optimize them...

Hi thanks for the information. A litte bit more info: The compressor and condenser appear from the outside to be similar, though there are no specs listed regarding compressor displacement at various RPMs. Some aftermarket compressors like the ones from Sanden have a very basic RPM/displacement...

I've long been extremely interested in automotive AC system/design but have repeatedly failed to find any substantial information on the topic in books or other online research. I have talked to other engineers that worked for automotive companies and worked on AC systems but to my knowledge...