Liquid Level Switches Explained - Industrial Refrigeration Ammonia industrial engineering
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Date: 2023-11-17
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Comments and reviews: 9
Sebastian
One thing I don't understand, why connect it to a alarm? Isn't the point of LLS'es to connect it to the system in a way so if level is high, it will run the system in a overcooling mode (meaning it will run the system harder than the call for cooling mandates, which of course means that if temperature control is important, you would need a waste evaporator somewhere that just dumps the cold somewhere) so to consume more ammonia (speeding up the pumps to the evaporator and adjusting the valve, while if the level is low, then cap the system by slowing down or locking out the pumps to the evaporator, to increase the level?
And same thing for the receiver, but in this case then control the compressor based on demand so it keeps the liquid level in the receiver good.
Of course it would need to raise an alarm if the liquid level is low more constantly, as that might mean there is a leak somewhere, and same if it high too often, because that might mean there is a constriction or blockage in some pipe.
But most controllers can raise an alarm if the cooling system is capped too often or run in overcooling mode too often.
reply
One thing I don't understand, why connect it to a alarm? Isn't the point of LLS'es to connect it to the system in a way so if level is high, it will run the system in a overcooling mode (meaning it will run the system harder than the call for cooling mandates, which of course means that if temperature control is important, you would need a waste evaporator somewhere that just dumps the cold somewhere) so to consume more ammonia (speeding up the pumps to the evaporator and adjusting the valve, while if the level is low, then cap the system by slowing down or locking out the pumps to the evaporator, to increase the level?
And same thing for the receiver, but in this case then control the compressor based on demand so it keeps the liquid level in the receiver good.
Of course it would need to raise an alarm if the liquid level is low more constantly, as that might mean there is a leak somewhere, and same if it high too often, because that might mean there is a constriction or blockage in some pipe.
But most controllers can raise an alarm if the cooling system is capped too often or run in overcooling mode too often.
reply
Kyle
Great video - super informative. I havent run into any electronic level controls; only magnetic level floats which are pretty much bullet proof. I see these electric level controls being an issue with how they are installed. There are contractors out there that dont put isolation valves around their sight glass columns. I also see over torque being a problem with them being sensitive electronics (similar to knock sensors for on-the-road engines); most low pressure receivers run between -20 and 50psi, so you dont have to tighten things too much like you would on steam or CO2 piping.
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Great video - super informative. I havent run into any electronic level controls; only magnetic level floats which are pretty much bullet proof. I see these electric level controls being an issue with how they are installed. There are contractors out there that dont put isolation valves around their sight glass columns. I also see over torque being a problem with them being sensitive electronics (similar to knock sensors for on-the-road engines); most low pressure receivers run between -20 and 50psi, so you dont have to tighten things too much like you would on steam or CO2 piping.
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Vijay
Hi Paul, how r u?
Your videos and explaination are awesome
Can you post video related to BMS for HVAC like DDC controller, IO digital and analog points, etc as I have not found any video related to this topic,
Once again thanks for your videos.
Stay home and Stay safe.
reply
Hi Paul, how r u?
Your videos and explaination are awesome
Can you post video related to BMS for HVAC like DDC controller, IO digital and analog points, etc as I have not found any video related to this topic,
Once again thanks for your videos.
Stay home and Stay safe.
reply
Nisha
Your explanation and animation are super cool dude. I have seen every one of your videos. The very informative and easy to understand. Upload more are more videos about basis and Arduino. Thank you
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Your explanation and animation are super cool dude. I have seen every one of your videos. The very informative and easy to understand. Upload more are more videos about basis and Arduino. Thank you
reply
Shahar
Can you please make a video explaining pneumatics? Love your videos, thanks to you, I have started tinkering with arduino and electricity!
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Can you please make a video explaining pneumatics? Love your videos, thanks to you, I have started tinkering with arduino and electricity!
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Peter
Do you have any videos that explain how an economizer or recirculating package on an industrial refrigeration system works? Thanks!
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Do you have any videos that explain how an economizer or recirculating package on an industrial refrigeration system works? Thanks!
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gumpster6
Informative video, but where the narration describes varying frequency the graphics depict varying amplitude.
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Informative video, but where the narration describes varying frequency the graphics depict varying amplitude.
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Mark
So informative, and as others have mentioned - fantastic animation. You sound a lot like Heston Blumenthal
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So informative, and as others have mentioned - fantastic animation. You sound a lot like Heston Blumenthal
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Bjarni
It's clever but wouldn't it be much cheaper and easier to have a floating bob with two limit switches?
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It's clever but wouldn't it be much cheaper and easier to have a floating bob with two limit switches?
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