The Engineering Mindset can you make a video about flow rate, pump capacity, pump pressure, how to calculate dimensions on copper pipes, pressure drop calculations, transmissions etc
Please explain trouble shoot of over charge of refrigerant. Explain what happens to the system if the refrigerant is over charged and also under charge
Just wanted to stop by and thank you for these videos. As a newer HVAC tech, these videos have taught me SO much more than anyone at my company has been able to teach me. Can you please make a video on Hard Start Kits and the difference from maybe SureStart Soft Start kit?
Thank you for the video. Good explanation about EEV operation. P. S. These EEVs might be a very precise tool to control SuperHeat. However, it’s not as reliable as a TXV. Last year, I had 2 HeatCraft walk-in freezers at Baskin-Robbins restaurants that were acting crazy, flooding the condenser, cooling poorly. One compressor that was only 4 years old has died. Had several calls to HeatCraft tech support; adjusting the SuperHeat reading/calibration on the control board, replacing sensors…. Long story short, after a month of giggle-wiggle I’ve got rid of these electronic controls and EEVs. Installed TXV, defrost timer and regular mechanical thermostats… It’s been almost a year now. Both customers are happy with -5F; -7F. No complaints. Today, I ran into another walk-in cooler from HeatCraft. This one is a big evaporator with EEV and… it’s acting the same way as those small walk-in freezers were doing; SuoerHeat hunting, flooding the condenser, suction line saturation temperature goes from ~24F to 2.1F in a minute or two… and goes back to -22F… Again, I will try to repmm m Ave the SuperHeat sensor as it was suggested by HeatCraft tech support…. However, I’ve got a feeling that it will end up with another TXV.
The best presentation I have seen so far on Split Air Conditioning System. Very lucid, explained with beautiful animations and graphics. Thanks for the video series.
Un lucked iam befor the systome see but iam all some one playin and pin moetha playin iam respeact any jobe not play this jobe may be competseion come but gues all gruped play boy iam 29 yer 5yer workin got come tomuch lafeing some some only not all my all gue S
Gracias por la explicación, estuvo excelente. Una pregunta. Es igual la la válvula de expansión en un Digital Inverter que un Inverter, en su controlador??
EXCELLENT INFORMATIVE VIDEO. GOD BLESS YOU. I V ONE QUESTION...WHAT IS MIN FLOW OF REFRIGERANT FOR RUNNING COMPRESSOR? HOW THIS IS ADJUSTED IN CONTROLLER?
Hey. Thanks for the really informative video. Let’s say I want to place a refrigerant tank in my schematic. As the mass flow rate of the refrigerant can vary a lot (from lowest rating to highest rating) let’s say from few grams per second up to kilograms per second. Is that even possible? If so, I assume there should be a tank placed somewhere. Where would it be? Thanks !
I believe main saving comes from operating valve so minimal super heat is achieved more precisely. Additionally because they can also use pressure sensors, they can estimate super heat much more precisely. Together with PID controller and autotune, they can maintain more stable super heat temperatures, without cycling or overshoots. Additionally they can act like a solenoid valve sometimes, to shut refrigerant off, eliminating parts; as well allow multiple evaporators to cooperate and optimize operation; other option is to cooperate with compressor, both to prevent compressor flooding and by providing easier start to compressor. Additionally most controllers can detect failure of the electronic coil or the valve (stuck position) by measuring current or resistance, and send a signal to other place to shut off the system, and even pump down refrigerant from the system to a reservoir, and prevent system leaks (on stuck / broken valve, or when the sensors detect very abnormal performance). So some of the savings are in reduction in maintenance and preventing various failures too. And because they are electronic and do have controller, they can be managed and monitored remotely, helping with troubleshooting, maintenance and optimization. Some of these features are not due to the valve itself, but due to better insight into system due additional sensors already in place to support the valve. Some of the electronic expansion valves are used for other purposes than just super heat control after evaporator. Some are just used as normal valves to control pressure, i.e. after the condenser or various by pass systems. They are quite versatile. Plus they are easy to adjust electronically, if the refrigerant type is changed in a system.
With EEV, inverter units: compressor, ID and OD fans can all ramp down to about 20% , meanwhile maintaining optional superheat and subcooling. EEV greatly aids these happening, And also reduce the need for defrost cycle
Professor, if you could please explain to us a video about the closed electric expansion valve, which carries the model EX7-121 from the working company Amrison, the method of connecting it to the driver, its maintenance, and its problems. I thank you for your cooperation. We greatly appreciate it.
Hey paul, could you please make videos on Suction and discharge superheat?? Your videos are way more detailed than any other videos available in Internet. I hope you this message.
Hey there! Do you plan to make a series of videos about all kinds of motors - steppers, asyncronous, etc and their features in terms of practical usage and basic theory stuff such as moment of inertia, idling? I mean, you have some videos but it would be interesting to see a bit more above basic leverl topics in terms of your awesome explanations!
Did I get it right, that the expansion valve uses pressure losses in order to reduce or increase massflow, so as a result the transfered heat to the ambient air is reduced or increased? Because if the area the fluid is flowing through is reduced, friction and therefor pressure losses increases.
EEV systems have variable speed compressor, that is, low cooling loads make the valve close down to keep the required superheat once the evaporator becomes cold and this tells the compressor to "unload" reducing head pressure, and vice versa. The AC system in my car works exactly like this even though it has a TXV and not an EEV. As soon as the TXV begins closing down to keep superheat constant even with a cold evaporator, a valve in the compressor senses the decreasing suction pressure and "unloads" the compressor. You distinctly hear the refrigerant flow reduce to a trickle and the compressor noise change after some seconds as the evaporator gets cold, if you hold an ear under the evaporator box...
Nice video indeed! How does the EEV work with a system where you have 4-way valve to turn evaporator to condenser and vice versa? Heat pumps with heating and cooling..
Hi Paul, great video! Just one clarification: How this operation stops when the set temperature is achieved?. Means How is it collaborated with the thermostat operation. ? Anybody please reply.
All refrigeration systems that use EEV's are computer controlled and have several sensors in the system. They also have a set "swing". For instance a multideck supermarket fresh meat case may drop down to 24F. This will close the stepper EEV valve or the pulse EEV valve which ever is being used. As soon as the valve closes the temperature starts to rise. The valve starts to reopen when the temp reaches 35F or so. That's the swing. The time between opening and closing of the EEV valve.
As for as my knowledge, as a certain temperature reached, the EEV will close the refrigerant and your machine will stop. as the temperature rise machine will start but the EEV still will close until the suction press drop. Then the EER will open gradually.
Hey my EEV looks completely different from the types you’ve shown, so then I’m having trouble visualizing how it works within my unit. It’s more like a rectangular tube with a plates on it. See EEV (USDM Denso) for 1993 FD3S.
What a great presentation! But I fail to understand how this stepper motor driven device can produce more accurate results and more economical operation than a correctly installed and sized txv that has infinite control positioning. It appeared to me that the device would operate on predetermined levels, be it 10, or 100, I am unsure about that
Stepper motor EEVs usually have 200...3000+ control steps. In laboratory you can see the difference between 240 steps & 480 steps, to see the difference 480 vs 2400 you need very precise tools. In real practice you see no difference in EEV capacity regulation with true infinite capacity regulation. More accurate SH regulation achivied due to electronic control of the valve - faster reaction + "proactive" PID controller vs "reactive" mechanical control. P.S. Even PWM EEVs like Danfoss AKV or Alco EX2 are OK for supermarket applications.
Even in case of HP EEV maintain superheat in evaporator (See "Heat Pumps Explained" at this channel). For reversing HPs it's a question of algorithm inside controller.
When I install a new EEV into the air con, should we need to set again,the zero point of the step motor for the main processor know how far motor goes ?
Hard to say basing only on "its choking" but from that I would guess not enough refrigerant is either in the system or passing into the evaporator. Call a refrigeration engineer to inspect.
please i have a problem with EEV error but i do not known the particular indoor unit, the system is Samsung VRF once the come all the unit will not work all the remote will shoe error 151 please help me thanks
Still not sure why you would use pressure when it's not needed. If you attach a thermistor at the outlet of the EEV and one at the outlet of the evaporator is that not true super heat? Following the refrigeration cycle if the outlet of the metering device is lquid vapor mix, then the refrigerant can not be super heated or sub cooled, and unless it's a Bose Einstein then in must be at boiling point, and any heat added to the refrigerant on the outlet side of the evaporator would be super heated by it's very definition. So why use a pressure transducer and then have a module simply convert it back to temperature any way. It's just one more thing to leak.
The reason is pressure losses are not taken into account with thermistor in and outlet controls. The distributor has a pressure loss and the evaporator to, the bigger the total pressure loss the bigger the superheat calculation error based on 2 thermistors. With small systems without a distributor and low pressure losses over the evaporator 2 thermistor calculations work perfectly.
Remember that pressure changes much more rapidly than temperature does, so it's a much more precise way of controlling superheat (and compressor loading and unloading too).
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
PayPal: www.paypal.me/TheEngineerinMindset
The Engineering Mindset can you make a video about flow rate, pump capacity, pump pressure, how to calculate dimensions on copper pipes, pressure drop calculations, transmissions etc
Please explain trouble shoot of over charge of refrigerant. Explain what happens to the system if the refrigerant is over charged and also under charge
Sorry, sending money from my country is difficult .. else I would have. He definitely deserves that.
Just wanted to stop by and thank you for these videos. As a newer HVAC tech, these videos have taught me SO much more than anyone at my company has been able to teach me. Can you please make a video on Hard Start Kits and the difference from maybe SureStart Soft Start kit?
Great to hear, glad you've found them helpful.
Very good
Thank you for the video. Good explanation about EEV operation.
P. S. These EEVs might be a very precise tool to control SuperHeat. However, it’s not as reliable as a TXV. Last year, I had 2 HeatCraft walk-in freezers at Baskin-Robbins restaurants that were acting crazy, flooding the condenser, cooling poorly. One compressor that was only 4 years old has died. Had several calls to HeatCraft tech support; adjusting the SuperHeat reading/calibration on the control board, replacing sensors…. Long story short, after a month of giggle-wiggle I’ve got rid of these electronic controls and EEVs. Installed TXV, defrost timer and regular mechanical thermostats… It’s been almost a year now. Both customers are happy with -5F; -7F. No complaints.
Today, I ran into another walk-in cooler from HeatCraft. This one is a big evaporator with EEV and… it’s acting the same way as those small walk-in freezers were doing; SuoerHeat hunting, flooding the condenser, suction line saturation temperature goes from ~24F to 2.1F in a minute or two… and goes back to -22F… Again, I will try to repmm m Ave the SuperHeat sensor as it was suggested by HeatCraft tech support…. However, I’ve got a feeling that it will end up with another TXV.
Manufacturers use this junk because it is cheaper and you will have to come back to their greedy arses to purchase a special unique replacement part.
Would you compare it to an engine using a carburetor versus fuel injection?
The best presentation I have seen so far on Split Air Conditioning System. Very lucid, explained with beautiful animations and graphics. Thanks for the video series.
8 people who tick dislike, they fell in the exams of refrigeration and A/C
Well done Paul. Thanks for your efforts mate.
That was one awesome explanation and many hours saved
I like understanding parts completely and this was perfect.
Un lucked iam befor the systome see but iam all some one playin and pin moetha playin iam respeact any jobe not play this jobe may be competseion come but gues all gruped play boy iam 29 yer 5yer workin got come tomuch lafeing some some only not all my all gue
S
Wonderfully clear presentation. Thank you!
Great video. If you could make one explaining bidirectional TXV would’ve be great.
Best video explanation!!!
So wonderful ur explaining
Excellent explaination i have seen ever..good job..thanks for making video
I appreciate your effort. Very nice presentation.
Very informative
you are the best, bro
Amazing
Thank you 😊
well explanied
Gracias por la explicación, estuvo excelente. Una pregunta. Es igual la la válvula de expansión en un Digital Inverter que un Inverter, en su controlador??
Amazing!
Great video thanks for making it
Good 👍 👍
EXCELLENT INFORMATIVE VIDEO. GOD BLESS YOU. I V ONE QUESTION...WHAT IS MIN FLOW OF REFRIGERANT FOR RUNNING COMPRESSOR? HOW THIS IS ADJUSTED IN CONTROLLER?
Appreciate your content on HVAC ! Could you make video on POSV usage and internal and external equaliser used upon TEV on chilled water system
Very good thank you
Supper Video sir . Sir meking a video Chiller Ac in All Faults . problem and Salutations...pls
Great work! Thank you!!!
Tank you so much for you
Thanks good info
Hey. Thanks for the really informative video. Let’s say I want to place a refrigerant tank in my schematic. As the mass flow rate of the refrigerant can vary a lot (from lowest rating to highest rating) let’s say from few grams per second up to kilograms per second. Is that even possible? If so, I assume there should be a tank placed somewhere. Where would it be? Thanks !
How long is the life span of EEV? Or how long is its operating hours before it malfunctions?
Helpful, thank you.
Didn't explain where the energy savings comes from... but very nice video! Thank you
I believe main saving comes from operating valve so minimal super heat is achieved more precisely. Additionally because they can also use pressure sensors, they can estimate super heat much more precisely. Together with PID controller and autotune, they can maintain more stable super heat temperatures, without cycling or overshoots. Additionally they can act like a solenoid valve sometimes, to shut refrigerant off, eliminating parts; as well allow multiple evaporators to cooperate and optimize operation; other option is to cooperate with compressor, both to prevent compressor flooding and by providing easier start to compressor. Additionally most controllers can detect failure of the electronic coil or the valve (stuck position) by measuring current or resistance, and send a signal to other place to shut off the system, and even pump down refrigerant from the system to a reservoir, and prevent system leaks (on stuck / broken valve, or when the sensors detect very abnormal performance). So some of the savings are in reduction in maintenance and preventing various failures too. And because they are electronic and do have controller, they can be managed and monitored remotely, helping with troubleshooting, maintenance and optimization. Some of these features are not due to the valve itself, but due to better insight into system due additional sensors already in place to support the valve.
Some of the electronic expansion valves are used for other purposes than just super heat control after evaporator. Some are just used as normal valves to control pressure, i.e. after the condenser or various by pass systems. They are quite versatile. Plus they are easy to adjust electronically, if the refrigerant type is changed in a system.
With EEV, inverter units: compressor, ID and OD fans can all ramp down to about 20% , meanwhile maintaining optional superheat and subcooling. EEV greatly aids these happening, And also reduce the need for defrost cycle
감사합니다.
Thank you, Peter!
Hi, can you make a video on how to select refrigeration system components (coils,compressors, pipes,..) after you calculate the BTUH required?
ua-cam.com/video/0gv2tJf7nwo/v-deo.html
Ton one ton =12000BTu/hr 1Btu=252calories1ton =12000btu×3024000calories 1rob=3024000/1000=3224 kilo calorehr.....
Please make video of, why actuator valve installed in return line?
Professor, if you could please explain to us a video about the closed electric expansion valve, which carries the model EX7-121 from the working company Amrison, the method of connecting it to the driver, its maintenance, and its problems. I thank you for your cooperation. We greatly appreciate it.
Hey paul, could you please make videos on Suction and discharge superheat?? Your videos are way more detailed than any other videos available in Internet. I hope you this message.
Have you seen our chiller essential terms video? Think I covered it in there. Although it was a long time ago, might have forgotten
Does the EEV has filter like manual ordinary TEV?
ElectronicExpansionValveBlog
Thnxs more
Good job💪🏻👍🏻🤙🏻
Hey there! Do you plan to make a series of videos about all kinds of motors - steppers, asyncronous, etc and their features in terms of practical usage and basic theory stuff such as moment of inertia, idling? I mean, you have some videos but it would be interesting to see a bit more above basic leverl topics in terms of your awesome explanations!
Absolutely, we have a few more mechanical based ones in production and the were going into electrical and electronics
look forward to watching educative videos! :)
Everyone in the trade needs to brush up on stepper motors.
Sir please make a video about difference between ac & dc motor and how to direct start our ac without PCB please sir thankyou
We have more electrical videos coming soon. I'll add it to the list
DC motors explained ua-cam.com/video/GQatiB-JHdI/v-deo.html
In your rappresentation is the thread a left hand one?
Did I get it right, that the expansion valve uses pressure losses in order to reduce or increase massflow, so as a result the transfered heat to the ambient air is reduced or increased? Because if the area the fluid is flowing through is reduced, friction and therefor pressure losses increases.
Are we able to use the same to control the humidity
How many pulse required to open valve
What does an equaliser line do in txv valve
How does the increase in cooling load increase the pressure? Doesn't it affect only the superheat?
EEV systems have variable speed compressor, that is, low cooling loads make the valve close down to keep the required superheat once the evaporator becomes cold and this tells the compressor to "unload" reducing head pressure, and vice versa. The AC system in my car works exactly like this even though it has a TXV and not an EEV. As soon as the TXV begins closing down to keep superheat constant even with a cold evaporator, a valve in the compressor senses the decreasing suction pressure and "unloads" the compressor. You distinctly hear the refrigerant flow reduce to a trickle and the compressor noise change after some seconds as the evaporator gets cold, if you hold an ear under the evaporator box...
Nice video indeed! How does the EEV work with a system where you have 4-way valve to turn evaporator to condenser and vice versa? Heat pumps with heating and cooling..
Check out our selection of free heat pump tutorials theengineeringmindset.com/heat-pumps/
@@EngineeringMindset thank you for not answering.
They work both in heating and cooling . Mini split eev ramp based on about 5-6 parameters mostly temp sensors
@@mk-yg6mi bypass with an extra eev for cooling, his heat pumps basics explains it.
Please provide all hvac related video in hindi
www.youtube.com/@EngineeringMindsetHindi
After evaporator refrigerant is HIGH TEMPERATURE, in this video LOW TEMP, please explain help me!
Whats inside a *FILTER DRIER* ➡️ ua-cam.com/video/R8_j4nI_ThI/v-deo.html
Can we relate this with PIBC valve??
Is that type of expansion valve used for 36000btu split type air conditioners?
Hi Paul, great video! Just one clarification: How this operation stops when the set temperature is achieved?. Means How is it collaborated with the thermostat operation. ? Anybody please reply.
All refrigeration systems that use EEV's are computer controlled and have several sensors in the system. They also have a set "swing". For instance a multideck supermarket fresh meat case may drop down to 24F. This will close the stepper EEV valve or the pulse EEV valve which ever is being used. As soon as the valve closes the temperature starts to rise. The valve starts to reopen when the temp reaches 35F or so. That's the swing. The time between opening and closing of the EEV valve.
As for as my knowledge, as a certain temperature reached, the EEV will close the refrigerant and your machine will stop. as the temperature rise machine will start but the EEV still will close until the suction press drop. Then the EER will open gradually.
How to make inverter ac compressor bored tester oregenal ?
Hey my EEV looks completely different from the types you’ve shown, so then I’m having trouble visualizing how it works within my unit. It’s more like a rectangular tube with a plates on it. See EEV (USDM Denso) for 1993 FD3S.
question : are the electronic expansion valve and linear expansion valve the same ? if not then whats the difference?
What a great presentation! But I fail to understand how this stepper motor driven device can produce more accurate results and more economical operation than a correctly installed and sized txv that has infinite control positioning. It appeared to me that the device would operate on predetermined levels, be it 10, or 100, I am unsure about that
Stepper motor EEVs usually have 200...3000+ control steps. In laboratory you can see the difference between 240 steps & 480 steps, to see the difference 480 vs 2400 you need very precise tools. In real practice you see no difference in EEV capacity regulation with true infinite capacity regulation.
More accurate SH regulation achivied due to electronic control of the valve - faster reaction + "proactive" PID controller vs "reactive" mechanical control.
P.S. Even PWM EEVs like Danfoss AKV or Alco EX2 are OK for supermarket applications.
See our new video on how to build mechanical versions of electronic circuits? Watch here: ua-cam.com/video/Zv9Q7ih48Uc/v-deo.html
Can the same EEV work to do both heating and cooling (in the case of a heat pump)?
Even in case of HP EEV maintain superheat in evaporator (See "Heat Pumps Explained" at this channel). For reversing HPs it's a question of algorithm inside controller.
Hi sir
In auto mode exv not open.. But manualy exv working... Whats the problem.. We change exv controller and display.. But same problem
Can i incorporate EEV's in a older system with mechanic TXV's/CCOTs?
Almost certainly, it does depend on the system though. You can find a valve for your system here: bit.ly/Electronic-Expansion-Valves
When I install a new EEV into the air con, should we need to set again,the zero point of the step motor for the main processor know how far motor goes ?
Read the manufacturers install notes
No, upon initial startup they self reset, travel to each end point to self check
What is superheat?
Great video, but your servo is hunting; Not good!
Hey. Is there a Danfoss app for questions, training? Or do I just use the webbbrowser?
Sure is, lots of them. Search for danfoss on your phones app store
@@EngineeringMindset yeah but haven’t found just that kind of app
Dear sir
Why refrigeration cycle choking and solution
Hard to say basing only on "its choking" but from that I would guess not enough refrigerant is either in the system or passing into the evaporator. Call a refrigeration engineer to inspect.
👍👍👍
My Mr Cool minisplit has an EXV. Their tech tells me I don't have to be concerned with superheat numbers.
How to diyrat eev ?
What about LEV’s
Those things are mad expensive!
please i have a problem with EEV error but i do not known the particular indoor unit, the system is Samsung VRF once the come all the unit will not work all the remote will shoe error 151 please help me thanks
New VRF unit video here:➡️ ua-cam.com/video/4i1XgcP1tmw/v-deo.html
Sir in mitsubishi vrf system indoor expansion valve is not working so what to do
Motor valve is not open so give me idea to open the valve
My best advice. Check the model number and download the technician manual from the manufacturer website. It should contain troubleshooting options
New VRF unit video here:➡️ ua-cam.com/video/4i1XgcP1tmw/v-deo.html
👍
Like
,👌👌👌👍
What happened to the VRF videos
New VRF unit video here:➡️ ua-cam.com/video/4i1XgcP1tmw/v-deo.html
My 2017 car uses an electronic expansion valve.
Failure in 2020.
Replaced,
Failure at 2022.
Still not sure why you would use pressure when it's not needed. If you attach a thermistor at the outlet of the EEV and one at the outlet of the evaporator is that not true super heat? Following the refrigeration cycle if the outlet of the metering device is lquid vapor mix, then the refrigerant can not be super heated or sub cooled, and unless it's a Bose Einstein then in must be at boiling point, and any heat added to the refrigerant on the outlet side of the evaporator would be super heated by it's very definition. So why use a pressure transducer and then have a module simply convert it back to temperature any way. It's just one more thing to leak.
Steve Brawner yep, the ones I see use line in line out thermistors to control the EEV. A suction pressure Transducer to control compressor speed.
The reason is pressure losses are not taken into account with thermistor in and outlet controls. The distributor has a pressure loss and the evaporator to, the bigger the total pressure loss the bigger the superheat calculation error based on 2 thermistors. With small systems without a distributor and low pressure losses over the evaporator 2 thermistor calculations work perfectly.
Remember that pressure changes much more rapidly than temperature does, so it's a much more precise way of controlling superheat (and compressor loading and unloading too).
Hey,friend.Need storage battery/battery Bms?Feel free to contact me~
Please remove subtitle, cause, dont see parts
Subtitles are not on the video. You can turn them on and off from your device
Wtf is super heat?
not so sure whats going on
Watch his other videos. That should help you. Paul is an awesome teacher.