Leaving a long career in refrigeration after being courted by a large mechanical company , lots to learn this video helped me with the fundamentals , thank you for the knowledge
I'm a 16 year old who benighted by this because I love clean energy and want to help provide it someday. This video has helped me furthermore understand cooling elements and pumps, thank you.
I thought I recognized your voice, good to see your still dedicated as ever to Delta controls. Your a good man I learned a lot from you I got into appliance repair after I left. I'm running my own business now. To bad we didn't work out I was just a kid then, I'll be watching your videos learning from afar!
Great video! I've searched high and low for just this type of video. You explained things crystal clear. Reading the comments also help to share other ideas and reap otherwise unprovided information. Please keep up the great work and community service!
Very good basic video, I am in water treatment. The mechanical knowledge is what many building engineers are looking for. You can take this video as far as one wants to go. I am seeing more and more scaled condenser tubes in the industry. This year alone, I would say I have witnessed more Eddy Current Testing than past years. Centrifugal, Reciprocating and Screw chillers is a good idea to discuss the advantages and disadvantages of each. Good stuff, young engineers need this information.
Thank you so much sir. I'm working in a plant involving this process and I have a hard time understanding the process. Then I watched this video and it really helped me a lot. Thanks! God bless!
This is a really awesome video, I always seen these water cooling towers in port aurther texas. When I was young I never new what they where, so know I now what they are after watching this video. The refineries had a lot of these cooling towers, for years I wanted to know what they where. Awsome video
Also noteworthy is that CHW loops and CW loops can be drawn OR pushed through the equipment. If your CWS comes out of the tower, then through the pump, then to the chiller - it is a drawn loop. if you return CHW from the building, run it through the pump, and then the chiller - you are pushing water through your chiller. Then you also have primary and secondary CHW pumps and constant volume bypass headers, etc, etc...
super informative. Thanks a bunch. I wish you could make videos explaining the different types of compressors and chillers; important maintenance and operation of chillers ; what are frequent problems in terms of design and operation that Facilitiy managers usually face
Thanks for this video I'm fairly new in facilities maintenance and a building manager. one of my weak points is understanding the BMS and air con in the building. this video has helped thanks again
Sir, Thanks a lot. You cleared my doubts. I was having basic idea on refrigeration, but when coming to industrials application all these machineries were looking like aliens to me. Now with this video i feel highly happy . Thank u once again. If possible please post on solar absorption chillers too
hi, great presentation, great. I'm barsileiro, live and work in Rio de Janeiro, I had a doubt Evaporator is not above, because the compressor suction in this cooller above, is what it seems! this is a chiller daikin macquay, and usually the condenser is below the evaporator, because the compressor is directly connected to the evaporator. my congratulations and Thanks for listening and post more videos.
I read your response back when you posted it, but I guess I forgot to say, "YUP! You are right." I guess I should have looked a project I was working on and redraw it rather than do it from memory. Good catch.
I was at a Female Correctional Facility in Ocala, Florida that used underground water and heat exchangers for the water source heat pumps. A real energy saver. Though at the time the plates were getting changed out because they litterally were creating pools of water on the floor from all the holes. ;)
Great Video , Thanks for sharing, little more details required for type of valves used and positioning of them, also for the selection of cooling towers, please share some more video with more detail which can help designing and equipment selections.Thanks.
3° The sprayed water is evaporating and cooling down the condenser water, the excess of water is dripping back to the basin. There is also a fan sucking air from the opening at the bottom and blowing it (hot and moisturized) at the top of the CT.
on the AHU - the coil connections can be configured in a variety of ways. The supply connection is not always the bottom connection; but it IS ALWAYS the connection on the "leaving-air" side of the coil. You want your coldest water to interact with the incoming air last in order to maximize the heat extraction from that air. Keep in mind none of this equipment actually "cools" water or air. It "extracts heat" from water and air, resulting in a cooling effect.
The Air Handler takes chilled water (generally 45°F) from the evaporator barrel. This water is in a "closed loop system" meaning that water cannot escape. (although through maintenance and time some does and a make-up system will be uses here as well) This closed loop system will cycle through the building collecting the heat the air handlers are removing. When it gets back to the evap barrel the heat will be transferred to the refrigerant.
DUDE! That is exactly what I thought when I started doing controls and came across my first cooling tower. I knew those big plumes were steam, but never knew what they heck they could be cooking that would need that big of an exhaust. LOL
2° When you compare the cooling towers, indeed they are not matching, the left one is called an open cooling tower exactly what you explained before, the right one is called a closed cooling tower, the water is circulating on top of the cooling tower in a closed coil (so the name closed cooling tower). There is a basin full of water at the bottom of the cooling tower; this water is continuously pumped to the top of the CT where nozzles are spraying the water on the condenser water coil.
I always tell my interns this. Supply lines head towards the load. Return heads away from the load. Condenser water supply goes from cooling tower to chiller. Chilled water supply goes from chiller to load.
Great video. I've piped a lot of chilled water systems without ever getting anywhere near the central plant. Now that I've become interested in the maintenance side, I realize I have a lot to learn. Could you do a diagram similar to the one in the video, only add typical valves to the basic system?
you can also pair cooling towers with heat exchangers and water source heat pumps to provide what is essentially called "Cooling Water" to units in a building achieving the same principal results. In this situation I've also seen cooling towers and Tower Water Loops substituted with Well Water Loops to take advantage of naturally occurring (free) "cooler" water - which is simply pumped through the primary side of a heat exchanger. Theres all sorts of neat shit out there...
4° When you draw the pipes, please consider that the water pipes are always connected at counter flow with the refrigerant (refrigerant is going down in the condenser as it condenses and going up as it boils in the evaporator) so exactly the opposite of what you draw there. Consider all these remarks as constructive
The refrigerant will transfer this heat to the condenser barrel which will transfer the heat from the refrigerant to the condenser water. The condensing water will go out to the water tower and be transferred to the air. The water in the closed loop system will also need to be treated. Since most chilled water piping is in black iron pipes the water will need inhibitors. Inhibitors prevent the iron from rusting in the pipe.
Thanks for the comment, James. For now I am going to disagree with you that there 'never' is a situation where the fan is turned by something other than a belt. Maybe the one in the video, sure. But I have seen cooling tower fans that are 20+ feet in diameter and no belt I know is going to be relied on to spin that puppy!
Hey control freak, i just wanted to make a correction about the motor, you said it is going to have some "gearing" to operate the fan. This is incorrect. With a motor vertical motor like that it is going to have a pully on the motor shaft and fan shaft and both be connected with a belt. If the motor was horizontal then the motor would be connected to a gear box with a drive shaft, and the fan shaft would be connected to the top of the gear box.
No. The cooling tower uses water that goes through the condenser barrel. This water is called condenser water. As this water is run through the water tower some of it will evaporate. Replacing the evaporated water is required to prevent it from eventually all evaporating. To do this we use a pipe system called make-up water that is pulled from the buildings supply water system. Because this water has minerals in it the water has to be chemically treated to prevent "scaling" on your tower fins.
Thanks for a very informative video. How would you know what size chiller to buy? Eg. if you are using chiller to cool plastic injection molds. Thanks in advance for your help.
hi TCF, The video is awsome,we do have the same kinda chiller at BTCG Gujarat,india.We do hav some technical probs with it....i ll come up with it in short tym...thnx fr d video.
Thanks a lot...very easily understandable...It was nice to have ur lecture.... can i know what is primary pump and secondary pump... and whey are used.. One more thing... it would be still better if you mention temperatures and pressures at each stage... thanks again
Sure... what you said. I know I messed up on the placement of the Condenser Water Pump, however the wording of Supply and Return should be used in relation to the Condenser Water Equipment. That usually means the Cooling Towers... and their job is to Supply cooler Condenser Water to 'whatever' is on the other end. A chiller, a heat exchanger... anything. The water that Returns back to the tower is well Condenser Water Return.
I have a question: The water on the cooling tower and the water going to the air handlers is the same fluid?. I mean, does the entiry system uses the same water? All the water is mixed?. Great video! Thanks
Hi, You mentioned the reason why CHWS should be in the bottom of the AHU and the CHWR to be in the top. Is this applicable to the Chiller also? I mean, the CHWS leaving the chiller should be from the bottom pipe and the CHWR to the chiller should be the top pipe?
Thanks for the comment, albeit a little hard to read. I reviewed the video once more to refresh my memory and well looks like you may be right. I kind of threw that video up a little fast. In many installations I have been on, the CDW pumps push through the chiller to the cooling towers. Thanks for the comment and I will need to add a correction to the video soon. Take care!
awesome show...but probably their is a small defect in this installation ...in video shown both pumps of circulation heat and cool water are installed in return network installations..it's obligatory to placed pumps on return network or in other side ? my opinion is to inverse installation because velocity of discharge water is Superior to velocity of suction water for this argument transfer heat and cool within evaporator and condenser cannot correctly carry out . that means long time running of chiller .
Hi, nice try.... but there are some mistakes, 1° The evaporator is the upper vessel, you can see the suction pipe to the compressor coming out of the evaporator which is the upper vessel. When you explain the cooling tower, you may say you cool down the water by blowing air through it, it's correct but far from complete, you have to say that you cool down the water because a portion of this water is evaporating; it means the water temperature can reach the air wet bulb temperature.
Regardless with the CDWS and CDWR if we say CDWS means the Condensing water supply that will RETURN to the Cooling tower going to the hot basin and drop to the cold basin and supply to condenser which is also called cooling tower water supply which is the Condensing water Return, i guess your Condensing water pump must be place in Cooling tower water supply "CDWR"
Hi sir, correct me if i'm wrong. Does the postion/ location of the pumps must be on the suppy lines (evaporator and condenser side)? based on the drawing you did. Please clarify. Thanks,
Hi CF, You mention the water leaving the condenser would be 'hot', going into the top of the cooling tower. Why would it be hot? Why not regular temp? Thx
I will disagree on that... I think if you have VFD control you are better off (energy-wise) running one fan at 80% than 2 or 3 at 20-30%. Though I will say alot of designs/sequences don't incorporate some way to run water across the tower with the fan being off. Most cooler outside air temps will actually do a good job cooling with no fan.
I have been in the industry for approximately 30 years, this may just be the most informative and to the point presentation to date. Well done
This video is from 2012 but watching it in 2020, very informative! Thank you!
Leaving a long career in refrigeration after being courted by a large mechanical company , lots to learn this video helped me with the fundamentals , thank you for the knowledge
I'm a 16 year old who benighted by this because I love clean energy and want to help provide it someday. This video has helped me furthermore understand cooling elements and pumps, thank you.
I thought I recognized your voice, good to see your still dedicated as ever to Delta controls. Your a good man I learned a lot from you I got into appliance repair after I left. I'm running my own business now. To bad we didn't work out I was just a kid then, I'll be watching your videos learning from afar!
This video is great - better than most HVAC text books.
Thanks for posting!
Great video!
I've searched high and low for just this type of video.
You explained things crystal clear.
Reading the comments also help to share other ideas and reap otherwise unprovided information.
Please keep up the great work and community service!
Here I am in 2024, appreciating a video that was from 12 years ago. Thank you, good sir
Very good basic video, I am in water treatment. The mechanical knowledge is what many building engineers are looking for. You can take this video as far as one wants to go. I am seeing more and more scaled condenser tubes in the industry. This year alone, I would say I have witnessed more Eddy Current Testing than past years. Centrifugal, Reciprocating and Screw chillers is a good idea to discuss the advantages and disadvantages of each. Good stuff, young engineers need this information.
Thank you so much sir. I'm working in a plant involving this process and I have a hard time understanding the process. Then I watched this video and it really helped me a lot. Thanks! God bless!
You made it clear and easy! The water into the chiller is also to the bottom and the exit to the top to avoid air accumulation. Thanks!
Im an entry-level Facilities and Maintenance Engineer in a local shopping mall. And this is very helpful :)
I m going to be interviewed for the position of facilities engineer next week ,can u plz guide me a little bit .will b thankful to u.
Excellent video. I really like the diagrams alongside actual pictures of the equipment.
This is a really awesome video, I always seen these water cooling towers in port aurther texas. When I was young I never new what they where, so know I now what they are after watching this video. The refineries had a lot of these cooling towers, for years I wanted to know what they where. Awsome video
Thank you for posting! Helps me understand low pressure refrigeration better!
Also noteworthy is that CHW loops and CW loops can be drawn OR pushed through the equipment. If your CWS comes out of the tower, then through the pump, then to the chiller - it is a drawn loop. if you return CHW from the building, run it through the pump, and then the chiller - you are pushing water through your chiller. Then you also have primary and secondary CHW pumps and constant volume bypass headers, etc, etc...
super informative. Thanks a bunch. I wish you could make videos explaining the different types of compressors and chillers; important maintenance and operation of chillers ; what are frequent problems in terms of design and operation that Facilitiy managers usually face
hfarhat001 I will add this to the list. I have decided to get back into making some more videos so stay tuned.
Thanks for this video
I'm fairly new in facilities maintenance and a building manager.
one of my weak points is understanding the BMS and air con in the building.
this video has helped
thanks again
Sir,
Thanks a lot. You cleared my doubts. I was having basic idea on refrigeration, but when coming to industrials application all these machineries were looking like aliens to me. Now with this video i feel highly happy . Thank u once again. If possible please post on solar absorption chillers too
hi, great presentation, great.
I'm barsileiro, live and work in Rio de Janeiro, I had a doubt Evaporator is not above, because the compressor suction in this cooller above, is what it seems! this is a chiller daikin macquay, and usually the condenser is below the evaporator, because the compressor is directly connected to the evaporator.
my congratulations and Thanks for listening and post more videos.
I read your response back when you posted it, but I guess I forgot to say, "YUP! You are right." I guess I should have looked a project I was working on and redraw it rather than do it from memory. Good catch.
I was at a Female Correctional Facility in Ocala, Florida that used underground water and heat exchangers for the water source heat pumps. A real energy saver. Though at the time the plates were getting changed out because they litterally were creating pools of water on the floor from all the holes. ;)
Great Video , Thanks for sharing, little more details required for type of valves used and positioning of them, also for the selection of cooling towers, please share some more video with more detail which can help designing and equipment selections.Thanks.
Thank You for your time and you explain everything so I could understand it. Thanks again. Great job
3° The sprayed water is evaporating and cooling down the condenser water, the excess of water is dripping back to the basin. There is also a fan sucking air from the opening at the bottom and blowing it (hot and moisturized) at the top of the CT.
on the AHU - the coil connections can be configured in a variety of ways. The supply connection is not always the bottom connection; but it IS ALWAYS the connection on the "leaving-air" side of the coil. You want your coldest water to interact with the incoming air last in order to maximize the heat extraction from that air.
Keep in mind none of this equipment actually "cools" water or air. It "extracts heat" from water and air, resulting in a cooling effect.
Great video! very simple and straightforward for me to finally understand the loops. Thanks.
I'll do my best.. gonna be trying to devote more time to more videos.
The Air Handler takes chilled water (generally 45°F) from the evaporator barrel. This water is in a "closed loop system" meaning that water cannot escape. (although through maintenance and time some does and a make-up system will be uses here as well) This closed loop system will cycle through the building collecting the heat the air handlers are removing. When it gets back to the evap barrel the heat will be transferred to the refrigerant.
DUDE! That is exactly what I thought when I started doing controls and came across my first cooling tower. I knew those big plumes were steam, but never knew what they heck they could be cooking that would need that big of an exhaust. LOL
2° When you compare the cooling towers, indeed they are not matching, the left one is called an open cooling tower exactly what you explained before, the right one is called a closed cooling tower, the water is circulating on top of the cooling tower in a closed coil (so the name closed cooling tower). There is a basin full of water at the bottom of the cooling tower; this water is continuously pumped to the top of the CT where nozzles are spraying the water on the condenser water coil.
I always tell my interns this. Supply lines head towards the load. Return heads away from the load. Condenser water supply goes from cooling tower to chiller. Chilled water supply goes from chiller to load.
Great video. I've piped a lot of chilled water systems without ever getting anywhere near the central plant. Now that I've become interested in the maintenance side, I realize I have a lot to learn. Could you do a diagram similar to the one in the video, only add typical valves to the basic system?
I'm getting back in to the swing of things and have made alot of videos, but haven't had time to produce them and post them online.
Great video! I am an apprentice engineer, and its spot on!!
nice! he did a better job then my old hvac teachers in school!
you can also pair cooling towers with heat exchangers and water source heat pumps to provide what is essentially called "Cooling Water" to units in a building achieving the same principal results. In this situation I've also seen cooling towers and Tower Water Loops substituted with Well Water Loops to take advantage of naturally occurring (free) "cooler" water - which is simply pumped through the primary side of a heat exchanger.
Theres all sorts of neat shit out there...
4° When you draw the pipes, please consider that the water pipes are always connected at counter flow with the refrigerant (refrigerant is going down in the condenser as it condenses and going up as it boils in the evaporator) so exactly the opposite of what you draw there.
Consider all these remarks as constructive
Thank for the great video! I only do residential trying to learn about commercial!
The refrigerant will transfer this heat to the condenser barrel which will transfer the heat from the refrigerant to the condenser water. The condensing water will go out to the water tower and be transferred to the air.
The water in the closed loop system will also need to be treated. Since most chilled water piping is in black iron pipes the water will need inhibitors. Inhibitors prevent the iron from rusting in the pipe.
Thanks for the comment, James. For now I am going to disagree with you that there 'never' is a situation where the fan is turned by something other than a belt. Maybe the one in the video, sure.
But I have seen cooling tower fans that are 20+ feet in diameter and no belt I know is going to be relied on to spin that puppy!
This is really a great educational video, I enjoy watching it. And I learned alot just watching it, great video you made.
Very precise and to the point explanation...
Thank you. This is a great video . Easy to understand and get your basics right :)
Hey control freak, i just wanted to make a correction about the motor, you said it is going to have some "gearing" to operate the fan. This is incorrect. With a motor vertical motor like that it is going to have a pully on the motor shaft and fan shaft and both be connected with a belt. If the motor was horizontal then the motor would be connected to a gear box with a drive shaft, and the fan shaft would be connected to the top of the gear box.
No. The cooling tower uses water that goes through the condenser barrel. This water is called condenser water. As this water is run through the water tower some of it will evaporate. Replacing the evaporated water is required to prevent it from eventually all evaporating. To do this we use a pipe system called make-up water that is pulled from the buildings supply water system. Because this water has minerals in it the water has to be chemically treated to prevent "scaling" on your tower fins.
Great explanation. I'm going to use this in a building construction management course I teach. Thanks for sharing.
It is also important to clean the tubes of the condenser barrel once a year to remove the scaling before it clogs the tubes.
Thanks for a very informative video. How would you know what size chiller to buy? Eg. if you are using chiller to cool plastic injection molds. Thanks in advance for your help.
hi TCF,
The video is awsome,we do have the same kinda chiller at BTCG Gujarat,india.We do hav some technical probs with it....i ll come up with it in short tym...thnx fr d video.
Great video. I do alot of chiller plant control systems.
Thanks a lot...very easily understandable...It was nice to have ur lecture.... can i know what is primary pump and secondary pump... and whey are used..
One more thing... it would be still better if you mention temperatures and pressures at each stage...
thanks again
Tnx for sharing...Additional knowledge as a Plant tender staff...
excellent explanation. that was a great overview. thank you
Great video, this is gonna help me at work a lot!
Thank you for posting this vedio give me for my hvac chilled water class you vedio clear and
helpfull. Thank you agian
Sure... what you said. I know I messed up on the placement of the Condenser Water Pump, however the wording of Supply and Return should be used in relation to the Condenser Water Equipment. That usually means the Cooling Towers... and their job is to Supply cooler Condenser Water to 'whatever' is on the other end. A chiller, a heat exchanger... anything. The water that Returns back to the tower is well Condenser Water Return.
Good luck, Brendan!
Thanks for this wonderful and very informative video presentation :)
I have a question: The water on the cooling tower and the water going to the air handlers is the same fluid?. I mean, does the entiry system uses the same water? All the water is mixed?. Great video! Thanks
Hi,
You mentioned the reason why CHWS should be in the bottom of the AHU and the CHWR to be in the top. Is this applicable to the Chiller also? I mean, the CHWS leaving the chiller should be from the bottom pipe and the CHWR to the chiller should be the top pipe?
this really helped me out a lot man thanks
very helpful...studying for Architectural Exams
really great explanation video, what's the next one?
Presentation is nice!
thanks for your support!!
Able,
Great video man. Thanks for sharing!
Simplistically informative. Thanks!
Thanks for the comment, albeit a little hard to read. I reviewed the video once more to refresh my memory and well looks like you may be right. I kind of threw that video up a little fast. In many installations I have been on, the CDW pumps push through the chiller to the cooling towers. Thanks for the comment and I will need to add a correction to the video soon. Take care!
Thanks i like it, if you could add more detailed presentation for the valves connections and controling. Thanks again
awesome show...but probably their is a small defect in this installation ...in video shown both pumps of circulation heat and cool water are installed in return network installations..it's obligatory to placed pumps on return network or in other side ? my opinion is to inverse installation because velocity of discharge water is Superior to velocity of suction water for this argument transfer heat and cool within evaporator and condenser cannot correctly carry out . that means long time running of chiller .
Control Freak........Nice Job Mate.....Thanx 4 the help
What pressures are these systems typically running at (12 minute mark) ? Referring to the water/glycol pressures...
Excellent lesson, thanks.
Excellent source of info
Thank you. I have been looking for a broad overview on this subject and i am glad i found your video.
May i ask where the condensate water outlet is?
Excellent video! Thanks (Thumbs up)
Hi, nice try.... but there are some mistakes,
1° The evaporator is the upper vessel, you can see the suction pipe to the compressor coming out of the evaporator which is the upper vessel. When you explain the cooling tower, you may say you cool down the water by blowing air through it, it's correct but far from complete, you have to say that you cool down the water because a portion of this water is evaporating; it means the water temperature can reach the air wet bulb temperature.
I appreciate your video, it´s very good explained, thank you so much.
Great Video Thank You for sharing your knowledge
Really helpful video, thanks
very informative. Great work
Thank you for sharing. I am now a subscriber.
Thanks for sharing. Very interesting.
Very informative. Thanks.
thanks for the information. I just have a question. Is this an open or a closed system?
please do explain about valves connections also.
I've installed many VFDs for C.T.s , its more efficient to run all CTs at lower speed than 1at the time , what do you think ?
Nice Video. Very Helpful
This is great stuff man, Thanks alot
Regardless with the CDWS and CDWR if we say CDWS means the Condensing water supply that will RETURN to the Cooling tower going to the hot basin and drop to the cold basin and supply to condenser which is also called cooling tower water supply which is the Condensing water Return, i guess your Condensing water pump must be place in Cooling tower water supply "CDWR"
Hi sir, correct me if i'm wrong. Does the postion/ location of the pumps must be on the suppy lines (evaporator and condenser side)? based on the drawing you did. Please clarify.
Thanks,
Great Learning Video!
this is very good.i am very thankfull.
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Condencers and cooling towers are the most common kinds of heat rejection equipment.
Hi CF,
You mention the water leaving the condenser would be 'hot', going into the top of the cooling tower. Why would it be hot? Why not regular temp?
Thx
The water is hot due to carrying the heat created by the compressor on the Chiller. It is similar to how a radiator works on your car.
I will disagree on that... I think if you have VFD control you are better off (energy-wise) running one fan at 80% than 2 or 3 at 20-30%. Though I will say alot of designs/sequences don't incorporate some way to run water across the tower with the fan being off. Most cooler outside air temps will actually do a good job cooling with no fan.
what is the difference b/n the working fluid in the refrigeration and air conditioning process?
thanks that was very helpful nice video
should the pumps be installed in the supply side or return side?