Chiller Basics - How they work part 2
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Date: 2023-11-17
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Comments and reviews: 30
movax20h
What would be some example number of temperatures and pressures in various parts, especially lets say in a warm climate, where it might be 50-55 deg C outside? If the water is coming through a closed loop in the cooling tower, it probably will equate in the end to about 50 deg C water coming to the condenser, so the discharge line from compressor would need to be even hotter, like 65 or deg C, so then 65 deg C goes to the cooling tower, and back as 50 deg C. That is my uneducated guess. Maybe some open loop evaporation cooling towers (swamp cooler) can do a better job and reject more heat at the expense of needing extra supply of water to recharge (not sure how much water would be needed. But I guess closed loop would be a bit better, as the water is in a closed system, so it requires less frequent refills and less frequent changes of water filters, and not need extra water overall.
On a similar note I was wondering if propylene glycol and water mixture is ever used in the chilled loop? I guess for big systems, it is not a good idea, because it costs quite a bit of money to fill the system or flush it, where it is definitively easier to do with a water, which only might require some simple on site filtration, and adding some corrosion and bio inhibitors. But maybe there are used where lower temperatures are required? I imagine using glycol is also undesirable in many applications, as there is bigger risk of forming ice (from moisture in the air) when it is carried around, and on the evaporator working at so low temperature.
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What would be some example number of temperatures and pressures in various parts, especially lets say in a warm climate, where it might be 50-55 deg C outside? If the water is coming through a closed loop in the cooling tower, it probably will equate in the end to about 50 deg C water coming to the condenser, so the discharge line from compressor would need to be even hotter, like 65 or deg C, so then 65 deg C goes to the cooling tower, and back as 50 deg C. That is my uneducated guess. Maybe some open loop evaporation cooling towers (swamp cooler) can do a better job and reject more heat at the expense of needing extra supply of water to recharge (not sure how much water would be needed. But I guess closed loop would be a bit better, as the water is in a closed system, so it requires less frequent refills and less frequent changes of water filters, and not need extra water overall.
On a similar note I was wondering if propylene glycol and water mixture is ever used in the chilled loop? I guess for big systems, it is not a good idea, because it costs quite a bit of money to fill the system or flush it, where it is definitively easier to do with a water, which only might require some simple on site filtration, and adding some corrosion and bio inhibitors. But maybe there are used where lower temperatures are required? I imagine using glycol is also undesirable in many applications, as there is bigger risk of forming ice (from moisture in the air) when it is carried around, and on the evaporator working at so low temperature.
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jothain
Quite good, but way too much in beginning about piping, pump and field layout. They're meaningless and I can only think that it might confuse people who don't have any knowledge about equipment. Then thing that strike me through is that even tough there are mention of vapor, liquid and temperature it immediately strike me during video that isn't pressure actually slightly dropping because of laws of physics? So it would be easier to have focus if you would've included temperatures and pressures of loop at inlets and outlets of each part. Only as a sample of working loop. Now I at least began to think during video is that is the valve actually keeping pressure same at condenser inlet and outlet or is temp drop affecting pressure too. I still think this has to be the case, but I'll look through series. But these are my current thoughts after this part. Oh and for the field layouts, it would be more effective to through them at end of the series when theory is done
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Quite good, but way too much in beginning about piping, pump and field layout. They're meaningless and I can only think that it might confuse people who don't have any knowledge about equipment. Then thing that strike me through is that even tough there are mention of vapor, liquid and temperature it immediately strike me during video that isn't pressure actually slightly dropping because of laws of physics? So it would be easier to have focus if you would've included temperatures and pressures of loop at inlets and outlets of each part. Only as a sample of working loop. Now I at least began to think during video is that is the valve actually keeping pressure same at condenser inlet and outlet or is temp drop affecting pressure too. I still think this has to be the case, but I'll look through series. But these are my current thoughts after this part. Oh and for the field layouts, it would be more effective to through them at end of the series when theory is done
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Ian
Awesome video, I do have a question though. 17: 53 Shouldn't the refrigerant be super heated instead of saturated in line 1 to prevent any liquid from reaching the compressor and damaging it (as compressors can't compress liquid? In my school I learned that they place a heat exchanger between the condenser outlet and the evaporator outlet to ensure all the vapor is super heated before reaching the condenser as well as sub cooling the condenser outlet to prevent vapor reaching the expansion valve.
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Awesome video, I do have a question though. 17: 53 Shouldn't the refrigerant be super heated instead of saturated in line 1 to prevent any liquid from reaching the compressor and damaging it (as compressors can't compress liquid? In my school I learned that they place a heat exchanger between the condenser outlet and the evaporator outlet to ensure all the vapor is super heated before reaching the condenser as well as sub cooling the condenser outlet to prevent vapor reaching the expansion valve.
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Jose
I love your videos for sure, I have three chillers in my building at the plant section, York 450 Tonnes screw type chillers which replaced two older centrifugal that had to go! The total cost of retro fitting about 2. 8 million, it was a big project which included other equipment replacement. My building was the first to use Co-Gen system in NY back in 2004 now much more popular these days.
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I love your videos for sure, I have three chillers in my building at the plant section, York 450 Tonnes screw type chillers which replaced two older centrifugal that had to go! The total cost of retro fitting about 2. 8 million, it was a big project which included other equipment replacement. My building was the first to use Co-Gen system in NY back in 2004 now much more popular these days.
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Bichael
I still don't get it: so, coolant picks up heat from the return water to cool the water, goes to the compressor in order to be pumped forward, goes to the condenser to dump the picked up heat, and goes back to pick up heat again in a circle? And the tower with fans picks up the dumped collected heat to cool it? Is that like a more complicated bigger version of an AIO water cooler?
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I still don't get it: so, coolant picks up heat from the return water to cool the water, goes to the compressor in order to be pumped forward, goes to the condenser to dump the picked up heat, and goes back to pick up heat again in a circle? And the tower with fans picks up the dumped collected heat to cool it? Is that like a more complicated bigger version of an AIO water cooler?
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Hari
Then where does the LiBr (lithium bromide) comes into the picture? That's what makes the difference between Chiller & VAM right? LiBr is what absorbes the refrigerant & upon heating it, you'll get the vapourised refrigerant. Because of the heating source - either electrical & steam, chiller & VAM works respectively right.
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Then where does the LiBr (lithium bromide) comes into the picture? That's what makes the difference between Chiller & VAM right? LiBr is what absorbes the refrigerant & upon heating it, you'll get the vapourised refrigerant. Because of the heating source - either electrical & steam, chiller & VAM works respectively right.
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Arief
It's such an amazing work u've done Paul. Thank u so much. Anyway, what type of shell and tube heat exchanger typically used for the evaporator especially in absorption chiller? Is it kettle reboiler? And what are the considerations to pick up between circular or rectangular shape heat exchanger for chillers?
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It's such an amazing work u've done Paul. Thank u so much. Anyway, what type of shell and tube heat exchanger typically used for the evaporator especially in absorption chiller? Is it kettle reboiler? And what are the considerations to pick up between circular or rectangular shape heat exchanger for chillers?
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Orlando
I know some are hardly to get the explanation because its pure theoretical, some are not well known about the properties of refrigerant especially the change of its state at every point in TS diagram and PH diagram. The explanation is for with an engineering course background especially in mechanical.
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I know some are hardly to get the explanation because its pure theoretical, some are not well known about the properties of refrigerant especially the change of its state at every point in TS diagram and PH diagram. The explanation is for with an engineering course background especially in mechanical.
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Ing.
On the T-S Chart the transformation 3-4 has a reduction of T. With respect to the definiton of H = E = E(T) we'd have a reduction of H. But for the lamination process, considering and adiabatic trasformation and L = 0, wants H = costant. How can we explain this contradiction? if it's so?
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On the T-S Chart the transformation 3-4 has a reduction of T. With respect to the definiton of H = E = E(T) we'd have a reduction of H. But for the lamination process, considering and adiabatic trasformation and L = 0, wants H = costant. How can we explain this contradiction? if it's so?
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Ajmal
Sir, i hav a doubt, the refrigerant entering the evaporator is at low temperature, and it picks up heat from the warm return pipe (from the building, so y is the refrigerant leaving the evaporator is stil at low temperature( it absorbed heat, so the temp must rise, right)
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Sir, i hav a doubt, the refrigerant entering the evaporator is at low temperature, and it picks up heat from the warm return pipe (from the building, so y is the refrigerant leaving the evaporator is stil at low temperature( it absorbed heat, so the temp must rise, right)
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Hari
Sir U said that From 4to1 low temperature to low temperature
If the gas enter in to evaporater it having low temp
While leaving it having high temp because of heat exchage take place between chilled water and refrigerent gas
(Sir If iam wrong can u explain it )
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Sir U said that From 4to1 low temperature to low temperature
If the gas enter in to evaporater it having low temp
While leaving it having high temp because of heat exchage take place between chilled water and refrigerent gas
(Sir If iam wrong can u explain it )
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Pete
I thought temps and pressures worked together in HVAC? When pressure goes up so does temperature and the other way around. How does the pressure stay the same from point 2 to point 3 but the temperature goes from high to medium temperature? Could someone explain?
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I thought temps and pressures worked together in HVAC? When pressure goes up so does temperature and the other way around. How does the pressure stay the same from point 2 to point 3 but the temperature goes from high to medium temperature? Could someone explain?
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Vibol
Make a lot sense from watching the video, thanks so much for your efforts. I like the tone, soft and smooth that makes a lot more easy to understand, plus the pictures, piece by piece, and section by section of the components, what is and its function.
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Make a lot sense from watching the video, thanks so much for your efforts. I like the tone, soft and smooth that makes a lot more easy to understand, plus the pictures, piece by piece, and section by section of the components, what is and its function.
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Phomolo
Very informative video. Interesting how there's no temperature change inside the evaporator even though there's clear heat transfer from the chilled water to the refrigerant. Is all the energy used up in the transition process?
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Very informative video. Interesting how there's no temperature change inside the evaporator even though there's clear heat transfer from the chilled water to the refrigerant. Is all the energy used up in the transition process?
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chuk
Very good video just wanted to point out that the expansion valve/metering device is mis-marked around the 13: 00 minute mark however. Other than that this is a very informative and well documented lesson!
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Very good video just wanted to point out that the expansion valve/metering device is mis-marked around the 13: 00 minute mark however. Other than that this is a very informative and well documented lesson!
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Rahul
Exactly the video I was looking for. You explain everything in such a clear and concise way with proper combination of theoretical and practical knowledge. Thanks a lot for a great content!
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Exactly the video I was looking for. You explain everything in such a clear and concise way with proper combination of theoretical and practical knowledge. Thanks a lot for a great content!
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Trung
I am a student at the national university of civil engineering in Vietnamese. These shares are very useful for my profession. Thanks so much for this video! Keep posting! Thanks once again.
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I am a student at the national university of civil engineering in Vietnamese. These shares are very useful for my profession. Thanks so much for this video! Keep posting! Thanks once again.
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Renato
Thank you for this video. I just graduated as a mechanical engineer and I want to open my own company related to that here in Brazil. It helped me a lot to understand the basics about it.
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Thank you for this video. I just graduated as a mechanical engineer and I want to open my own company related to that here in Brazil. It helped me a lot to understand the basics about it.
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Aquib
Sir after process complete in condensor we have saturated liquid(Refregirant) further in expansion valve if temperature is decreasing then how it we are getting liquid and vapour mixture?
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Sir after process complete in condensor we have saturated liquid(Refregirant) further in expansion valve if temperature is decreasing then how it we are getting liquid and vapour mixture?
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Luis
Great video. I appreciate the use of real photos and the relationship between components and the refrigeration thermodynamic cycle. Keep doing the good work. Greetings from Venezuela
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Great video. I appreciate the use of real photos and the relationship between components and the refrigeration thermodynamic cycle. Keep doing the good work. Greetings from Venezuela
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deion
Just joined a manufacturing company as a 24 year old fresh out of his Mechatronics course. I have trouble remembering things on the job and your videos bring me confidence!
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Just joined a manufacturing company as a 24 year old fresh out of his Mechatronics course. I have trouble remembering things on the job and your videos bring me confidence!
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FEMIN
Extraordinary experience. Your's was such a good explanation to understand much better and easier.
Much thanks for the video and best wishes for your further videos
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Extraordinary experience. Your's was such a good explanation to understand much better and easier.
Much thanks for the video and best wishes for your further videos
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Henry
Paul, thanks so much for your effort on these videos. I am a mechanical engineer just entered the chiller industry, and found your videos to be a great help.
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Paul, thanks so much for your effort on these videos. I am a mechanical engineer just entered the chiller industry, and found your videos to be a great help.
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Bichael
It's pretty hard for me to apply this information to the chillers we got - self-contained units like the Neosys NAC300 - theyre radically different
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It's pretty hard for me to apply this information to the chillers we got - self-contained units like the Neosys NAC300 - theyre radically different
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JM901
I'm a HVAC Tech Starting in the chillers Phase Thanks so much. You have Broken This down to the simplest form. I fully understand the basics. Thanks
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I'm a HVAC Tech Starting in the chillers Phase Thanks so much. You have Broken This down to the simplest form. I fully understand the basics. Thanks
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Peter
This is one the best explanations I have encountered. I use this to teach at times. Thank you so much from all of us at. - Wellan Synergy Inc.
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This is one the best explanations I have encountered. I use this to teach at times. Thank you so much from all of us at. - Wellan Synergy Inc.
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Patrick
Hey thanks for the video. Helps me with my learning and I got some notes, I'm 14 but I plan to go into trade and these videos help a lot.
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Hey thanks for the video. Helps me with my learning and I got some notes, I'm 14 but I plan to go into trade and these videos help a lot.
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Anguh
Thanks for the knowledge, but I want to ask pls I want to understand the deferent functions between condenser and the evaporator? Thanks
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Thanks for the knowledge, but I want to ask pls I want to understand the deferent functions between condenser and the evaporator? Thanks
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Fernando
Thanks so much for your videos! I just started as a maintenance mechanic and this is going to help me tremendously.
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Thanks so much for your videos! I just started as a maintenance mechanic and this is going to help me tremendously.
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Alan
Im a new HVAC Mechanic coming from a Boiler Operator background. Cant thank you enough for sharing your knowledge.
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Im a new HVAC Mechanic coming from a Boiler Operator background. Cant thank you enough for sharing your knowledge.
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