Quote:
Originally Posted by teoman
Anyone have an ide of roughly how many liters per minute or hour are circulated? In liquid form? Or mass?
I ask because my old car was converted to LPG, and it would use engine coolant to vaporize the lpg. I always thought that was a huge waste of its cooling potential. I wanted to modify the vaporizer and put it inside the car or pass it theough the ac vaprizer. But never got around to doing the calculations if it would be worth it.
Checking the average, it looks like it was 14.8 liters of lpg per 100km.
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I have no idea how much refrigerant the system actually circulates, but that would vary a lot based on the vehicle, the size of the AC system, ambient temperatures, engine RPM, airflow, and even vehicle speed.
However, I am thinking if you have a rough idea of the system's capacity (BTU per hour), you could calculate how much refrigerant would need to circulate based on the refrigerant's latent heat of vaporization in BTU's/LB. Basically that is a measurement of how much heat one pound of the refrigerant will remove if it vaporizes. Here is a chart of the latent heat of evaporation of some fluids, including refrigerants:
https://www.engineeringtoolbox.com/f...eat-d_147.html
So basically I think you would need to figure out how many pounds of refrigerant need to be circulated per hour to get to the refrigeration capacity of the system (in BTU's per hour) based on it's latent heat of vaporization, then convert the pounds to liters. I'm not sure how well that would work though.
So here's an example: The system has an output of 12000 BTU and uses R22, which has a BTU/LB of 100. Divide 12000 by 100, and you get 120 pounds of refrigerant per hour needed to provide that cooling capacity, or 2 pounds per minute. Then you would figure out the density of R22 and convert to liters. I think that should work anyways
