Hi sir, what is the control methodology to control the fans of the air cooler chiller based on load ? Also what is general control methodology to for controlling the compressor of air cooled chiller based on load ?
Some great videos Paul. One thing that is not mentioned here is regarding the size of the heat exchanger - because it is sized for the peak load, when running at part loads the flow still goes through the same heat exchanger but at lower velocities. Reduced velocities equate to lower Reynold's numbers (a measure of how turbulent the flow is) - the higher the Reynold's number the better the heat transfer and hence efficiency. If the Reynold's number is low enough the flow is laminar and there is a significant reduction in performance. Hence operating at part loads causes a loss in efficiency as the heat exchanger is essentially oversized. This can also cause the heat exchanger to foul up more quickly as the particles that cause fouling can drop out more easily and stick to the surface of the heat exchanger. The only way to improve this is to have multiple heat exchangers that can be brought online as the load increases - however this is not always an option with space restrictions so the design of the heat exchanger is fundamentally important in that respect.
This is one of the best educational channel for engineers. Your explanation along with graphics makes it easier to understand. It is very difficult to picture something in your mind when you have no idea about how it looks like, that is where your video makes a difference. Very practical. Thank you from a sincere engineer
hello, big thanks on all the great videos you post. they are a huge help. is there an option that you will do a video or a series of videos about humidifiers and how they work ?
is there a video out for setting up danfoss hvac drives especially one that goes into all the settings and software settings? ive seen some but not all of them are that helpful.
Hi and thanks for reaching out. Unfortunately we don't have one overall video for setting up VLT HVAC Drives. Here is a general video: ua-cam.com/video/kM362qeTTew/v-deo.html and you've probably seen videos such as this one: ua-cam.com/video/JQYk0Pm_NyM/v-deo.html. You can read more about the product on our website: www.danfoss.com/en/products/ac-drives/dds/vlt-hvac-drive-fc-102/. Please don't hesitate to reach out to your local sales office for further assistance: www.danfoss.com/en/contact-us/contacts-list/?filter=type%3Adanfoss-sales-service-center. Kind regards.
These standard manufacturers of chillers are not efficient. We have a new carrier unit chiller and the power consumption is horrible. We purchased an chiller from a refrigeration company that designed it from scratch, and its consuming half the electricity of the carrier unit. Plus it was about 30%cheaper than the carrier unit
They are efficient but only if sized correctly and controlling properly. Of course having anything custom made is going to be better than a one size fits all.
Cooling tower fans do not consume a lot of power compared to the chiller compressor(s). I don't like a single condenser water set point (i.e. 80F/27C), because it often makes the chillers work harder unnecessarily, killing your COP. I prefer targeting 5F(3C) above the outside air wet bulb temperature with a 55F(13C) low limit. This strategy works in every climate, dry or humid.
Thanks for your videos! Do you have any extra information or videos on how to go about utilizing a chiller sequencer? Is this similar to lead/lag, or can I program the chillers to run at specific loads instead of just on/off. We have two chillers of different capacities, so each has different efficiencies at different loads.
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Hi sir, what is the control methodology to control the fans of the air cooler chiller based on load ?
Also what is general control methodology to for controlling the compressor of air cooled chiller based on load ?
Some great videos Paul. One thing that is not mentioned here is regarding the size of the heat exchanger - because it is sized for the peak load, when running at part loads the flow still goes through the same heat exchanger but at lower velocities. Reduced velocities equate to lower Reynold's numbers (a measure of how turbulent the flow is) - the higher the Reynold's number the better the heat transfer and hence efficiency. If the Reynold's number is low enough the flow is laminar and there is a significant reduction in performance. Hence operating at part loads causes a loss in efficiency as the heat exchanger is essentially oversized. This can also cause the heat exchanger to foul up more quickly as the particles that cause fouling can drop out more easily and stick to the surface of the heat exchanger. The only way to improve this is to have multiple heat exchangers that can be brought online as the load increases - however this is not always an option with space restrictions so the design of the heat exchanger is fundamentally important in that respect.
This is one of the best educational channel for engineers. Your explanation along with graphics makes it easier to understand. It is very difficult to picture something in your mind when you have no idea about how it looks like, that is where your video makes a difference. Very practical. Thank you from a sincere engineer
Learn how to *CALCULATE CHILLER SAVINGS* here: ua-cam.com/video/YMwb3-N_Lu8/v-deo.html
Sub cooling can be done for both water and air cooled chillers ...for power saving
What are the pros and cons of increasing the chiller's flow rate? by increasing the chiller flow rate, it'll produce more cooling water.
hello,
big thanks on all the great videos you post. they are a huge help.
is there an option that you will do a video or a series of videos about
humidifiers and how they work ?
i work for Johnson Controls, i love the videos i tell my guys to check out alot of your vids it helps train alot of these younger guys
We have johnsons york chillers, please guide us in order to reduce the ikw/TR of chiller
You do amazing videos, thank you!! The animation in your videos, showing the moving lines representing flow, what program are you using?
Super keep doing in Chiller topic pls
Thank you for this nice work
I love your videos deeply love
Have you covered absorption chillers?
Excellent video!! Thanks
What is the difference in energy savings with using VFD on compressor vs van guides?
how bout spraying water on condenser?
is there a video out for setting up danfoss hvac drives especially one that goes into all the settings and software settings? ive seen some but not all of them are that helpful.
Not on this channel, but I will pass your message on to them
Hi and thanks for reaching out. Unfortunately we don't have one overall video for setting up VLT HVAC Drives. Here is a general video: ua-cam.com/video/kM362qeTTew/v-deo.html and you've probably seen videos such as this one: ua-cam.com/video/JQYk0Pm_NyM/v-deo.html. You can read more about the product on our website: www.danfoss.com/en/products/ac-drives/dds/vlt-hvac-drive-fc-102/. Please don't hesitate to reach out to your local sales office for further assistance: www.danfoss.com/en/contact-us/contacts-list/?filter=type%3Adanfoss-sales-service-center. Kind regards.
What is the difference between free cooling and economiser cooling? Are they just the same...
they are the same
An economiser cooling is a free cooling process using a heat exchanger
Hi sir its my request plz upload all these videos in Hindi.
Like all related with chiller.
www.youtube.com/@EngineeringMindsetHindi
How much of the chiller efficient
These standard manufacturers of chillers are not efficient. We have a new carrier unit chiller and the power consumption is horrible. We purchased an chiller from a refrigeration company that designed it from scratch, and its consuming half the electricity of the carrier unit. Plus it was about 30%cheaper than the carrier unit
They are efficient but only if sized correctly and controlling properly. Of course having anything custom made is going to be better than a one size fits all.
Does EC (air-cooled chiller) fans retrofit at condenser improve the efficiency significantly where the normal non-EC fans used have staging feature?
Potentially, because of the fan affinity laws. Check out fan calculation video. If your chiller is logging the fan data then you can calculate it.
Try tun for
👍👍👍
Cooling tower fans do not consume a lot of power compared to the chiller compressor(s). I don't like a single condenser water set point (i.e. 80F/27C), because it often makes the chillers work harder unnecessarily, killing your COP. I prefer targeting 5F(3C) above the outside air wet bulb temperature with a 55F(13C) low limit. This strategy works in every climate, dry or humid.
Amazing quality and professional explanations,
Typo @7:16? Full load set point should be 27C/80.6F
Very good report.Thi´s help me so much. Many thanks.👍
Please do a VFD video please . Love your channel keep up the good work
There's one coming in a few weeks on vfd
VFD Video is now live! here: ua-cam.com/video/yEPe7RDtkgo/v-deo.html
It's very useful and pls explain the EXV
Here you go: ua-cam.com/video/XHtRHiKIsEU/v-deo.html
W done
Your video are really amazing. Can you please a video on chemical dosing for Condenser water & chilled water. your work is highly appreciated.
Please.It explains the loss of efficiency of chillers and other systems due to maintenance factors.
Thanks for your videos! Do you have any extra information or videos on how to go about utilizing a chiller sequencer? Is this similar to lead/lag, or can I program the chillers to run at specific loads instead of just on/off.
We have two chillers of different capacities, so each has different efficiencies at different loads.
Not currently. Best option is contact a supplier or your BMS specialist
This is stellar 💯
You 575
Chilled water reset and condenser water reset will only work if vfd is there in the system right?
VFD Video is now live! here: ua-cam.com/video/yEPe7RDtkgo/v-deo.html