Eric Mele shows how mechanical subcooling works on a rack refrigeration system. Mechanical subcooling allows us to drop the liquid refrigerant temperature even lower after it leaves the condenser.
Upon exiting the condenser, the liquid refrigerant moves through the liquid line. In this case, the liquid line goes to a brazed-plated heat exchanger buried in some insulation. The liquid goes in one side of that heat exchanger and comes out the other side subcooled. On the other part of the heat exchanger, refrigerant flashes in the expansion valves.
On this particular system, the cooling circuit comes from a different rack, but it may come from the same rack as well.
The idea behind mechanical subcooling is to get more capacity out of the same amount of refrigerant. You can also put that load onto another rack. In this case, a medium-temp rack could benefit from better efficiency. (Note: if the other rack is struggling, you may cause the rack with mechanical subcooling to struggle as well.) Mechanical subcooling can also help counter the negative effects of long line lengths and improper pipe sizing.
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Upon exiting the condenser, the liquid refrigerant moves through the liquid line. In this case, the liquid line goes to a brazed-plated heat exchanger buried in some insulation. The liquid goes in one side of that heat exchanger and comes out the other side subcooled. On the other part of the heat exchanger, refrigerant flashes in the expansion valves.
On this particular system, the cooling circuit comes from a different rack, but it may come from the same rack as well.
The idea behind mechanical subcooling is to get more capacity out of the same amount of refrigerant. You can also put that load onto another rack. In this case, a medium-temp rack could benefit from better efficiency. (Note: if the other rack is struggling, you may cause the rack with mechanical subcooling to struggle as well.) Mechanical subcooling can also help counter the negative effects of long line lengths and improper pipe sizing.
Read all the tech tips, take the quizzes, and find our handy calculators at https://www.hvacrschool.com/.
Learn more about the 2022 HVACR Training Symposium at https://hvacrschool.com/symposium/.
Mechanical sub cooling, basically we're using a means to cool the liquid refrigerant down beyond where we got it with our condenser. So if you see our liquid line coming up here going past the ldr valve into this braised plate heat exchanger, buried in this insulation, so the liquid is going in on one side and then it's coming out sub cooled on the other. And then you have, on the other part of the heat, exchanger refrigerant, being flashed in there through the expansion valves and sucked back out. In this case, the cooling circuit is coming from a different rack, so it can come from a different rack.
It can come from the same rack, so here's a sub cooled liquid. Now our liquid line is insulated. Going back there to the liquid header, the circuits are all going down through the floor and the suction lines are blocking the view along with the defrost. But that's the basic layout now the idea is to get more capacity out of the same amount of liquid.
So now i'm tracing the circuit back to the medium temp rack, where it comes from, so you get more capacity out of the same amount of liquid plus you can put that load onto a medium temperature rack where it's getting better efficiency. So it helps with line lengths. It helps with you know, pipe sizing, all that sort of thing and potentially putting the load onto another rack, although that can give you issues if your medium temperature rack is struggling, it can cause the rack with the sub cooler to struggle as well, so just something To consider thanks for watching our video, if you enjoyed it and got something out of it, if you wouldn't mind hitting the thumbs up button to like the video subscribe to the channel and click, the notifications bell to be notified when new videos come out, hvac school Is far more than a youtube channel, you can find out more by going to hvacrschool.com, which is our website and hub for all of our content, including tech tips, videos, podcasts and so much more. You can also subscribe to the podcast on any podcast app of your choosing.
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Hello good video. Do you know how far can we subcool the liquid line?
Any chance you have a video detailing ruud heat pump thermostat wiring procedure? Bought a home and cooling works fine but no heat.Thanks.