VRF Systems Explained - Variable refrigerant flow basics HVAC

[@EngineeringMindset]

*This video took a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@mike-ology22]

Hiya mate, great video once again. What is your opinion on MVHR units? I personally think they are a waste of resources and don't work very well. Mixed mode is quite impressive on this system.

[@mohamedsaboormohamedzakari7140]

Thanks

[@MrPaolosio]

What is this based on?@@mike-ology22

[@mfawzi89]

the knowledge gained from the information in these videos can be put as skills in my CV 😅

[@sandrider1406]

Ye right 🤡

[@E_Rico]

“I watched a couple youtube vids, I think that I can be a great contribution to the company”

[@amawelasegroupptyltd3055]

😂😂😂

[@discobriscoe5880]

@@E_Rico worked for me

[@poiuytrewq8ff]

I watched a video on performing surgery, guess I can advertise myself as a surgeon now.👨‍⚕️

[@BirdmanHT07]

I am a controls tech, one of the colleges near me has a newer wing with a VRF system in it. Doing building automation, I have a pretty good understanding of commercial HVAC but these videos are great. Started watching the channel because I did an Electrical engineering technology course at college, and was watching your electrical videos for fun. Then stumbled onto your HVAC section, amazing. I'm buying you a coffee.

[@JohnnyJr396]

Just sent you a little appreciation. Thanks for this video. I’ve watched a few try to explain and even they stumbled. You truly are a master at explaining complicated tech.

[@sheriframzy2387]

just perfect. Thank you so much! As a building sustainability consultant coming from an architecture background, I need such knowledge badly since they are very important for building sustainability but we as architects don't have it.

[@Nayan133]

I think this is the sufficient video ever at starting stage to enter into the profession or research on refrigeration & heat pump field ❤️.

[@mahdi.shahsavari]

Very comprehensive. thank you, Paul!

[@rolliebca]

Such an excellent video explanation of this complex system. Thanks!

[@abdullahalotaibi570]

An excellent presentation, simple, easy , clear and covers all the important details. Thank you for this great job.

[@EGBROWNSB1987]

I worked on city multi units before but always thought of them as more heat pumps than VFRs thank you for this video

[@adriangabriel176]

I work as a refrigerationist and this is pretty interesting for me being a total beginner, it's a game changer

[@lennydarko5125]

Very concise simple to understand explanation of a very complex process. Great information.

[@tinytonymaloney7832]

The graphics on these vids are fantastic. And very well explained.👍👍👍

[@GururajBN]

I have a split air conditioner in my bedroom. I use it only in summer months. It runs up huge electricity bills. Now I understand that it is not a VRF system. Good old AC which steadily consumes power as long as it is on. Very instructive video.

[@mitulshetty3736]

Thanks a lot for this amazing explanation, really got me thinking about getting in the HVAC sector.

[@MrPaolosio]

MSc student using dynamnic simulation modelling which includes HVAC - this video is very useful - best yet from you i think :)

[@4n2earth22]

Excellent presentation. Excellent!

[@northernporter430]

very well done, thank you for the explanation!

[@AJ-ox8xy]

Holy smokes. This is the first time I've heard of these systems. I always wondered if it was possible. That's so cool!!!

[@LabArlyn]

Same.

[@DavidFernandez-tw1hu]

incredibly explained ty ❤❤❤

[@learngermanforeverysituati6018]

Thanks for the video, it is well explained.

[@user-kt2hb8xr3p]

Great job, thank you brother. You are so talented

[@NavjotSingh-ou1xg]

Thanks for your support.

[@Borderlineautistic]

Having you and Bryan on this site has made this apprenticeship an absolute breeze.

[@nczioox1116]

Helped me understand. Thank you

[@CommercialGasEngineerVideos]

Thanks. Good explanation

[@ericscherer7468]

As a HVAC/R technician I really appreciate these videos and all the details you include in the videos. On another note, I know I can’t be the only one being thrown off by the R-410a tank being the R-22 green color right? Lol

[@mostfams]

Great thank you.

[@babaolowo35]

THANK you

[@paulvargas5928]

Whoa what an awesome educational work here. You are talented

[@EngineeringMindset]

Thank you! Cheers!

[@godwinmpazi1062]

Brilliant.Stay blessed

[@yoksphtv]

Very informative. My present project buildings uses VRF systems. I am working on the Electrical sides, control systems, which uses VRF smart manager.

[@Madzxcs]

Awesome, this is very relevant to my thesis proposal.

[@EngineeringMindset]

Glad it was helpful!

[@Z901Z]

Wooohoooo, this is what Ive been waiting for!

[@EngineeringMindset]

Finally got to it on the list! phew

[@Z901Z]

@@EngineeringMindset brilliant job by the way!

[@Paweladamczykw]

Great!

[@RedBatteryHead]

Great info. Wasn't aware on these units.

[@richardbartlett6932]

they have been around since the early '80,s

[@thesilentonevictor]

Great video

[@Christopher-th5m]

Wow and what great technology, and all for under $100!

[@DriveYorCareer]

Much Waited Video

[@zahidiqbalkhan9444]

I am going to supervise hvac vrf system so guide me more please thanks for sharing such knowledgeable video

[@fahimhossain5784]

Thanks

[@engineeringmaniac9696]

great video

[@IkKhan-fp5rq]

Behtareen

[@thusithadevamendis4325]

Thanks 👍👍👍 Sir Lanka 🇱🇰

[@anasluqman3042]

thanks

[@user-jy6pn7mn4u]

amazing

[@erick_bst]

I used to hate to work VRF systems until I understood how convenient and easy are to work on and to retrofit on old buildings.

[@bztherpr7764]

You are awesome just awesomw

[@brlinrainf]

Best video

[@matthewmartineau3678]

You should do a video on unloaders if you havent already. Great video for sure though, VRF has a huge place in the industry's future

[@samhaazratechnicalsupport]

Very niece sir ❤❤❤

[@SMDDR]

Great video, I work in a building that has a cooling tower and glycol loop, so we have packaged units in the drop ceiling all over the building. I will definitely be working some of your videos into our training program.

[@EngineeringMindset]

Glad to hear, if you'd like to use them offline without all the annoying ads and branding, we do also license to business.

[@SMDDR]

@@EngineeringMindset I'll speak with accounting about that

[@SamuelGonzalez-tr2pe]

Showing this video to my supervisor on our Monday meeting.

[@MrDsr001]

Thank you I like that one

[@EngineeringMindset]

I'm glad you like it

[@herbsgotaZX]

I'm working on a hybrid vrf system from Daikin doing the controls for the building automation system wiring the branch selectors and FCU in the whole building and it's also using a doas system to bring outside air inside the building very interesting set up

[@crumpet_]

This is such a great vid. I loved the live action lab shot showing low boiling point. What is this glass device called? I imagine its a very cool engineering desk toy!

[@JustPyroYT]

Very interesting👍 good video👍👍👍

[@EngineeringMindset]

Thank you very much!

[@boywhohadatiger]

I remember doing commercial hvac we installed a caste system in a fire station that uses vrf by daikan very neat technology and the firefighters thought it was neat they have individual temperature controls

[@Sghh-q5j]

കൊള്ളാം 👍👍

[@gatorengi]

Late to the party here. Two questions to help wrap my head around the VRF Systems: 1. When moving heat between two rooms, does the compressor run at all? If not, how does it not? Is there just enough liquid refrigerant and pressure in the system to keep moving heat? 2. Could one or more of the heads in such a system be a thermal storage tank? (I.e. freeze a block of ice at night then run off it in the day) THANK YOU FOR ALL THE AMAZING VIDEOS!

[@hemanthulswar9487]

In 2007 VRF system was new in INDIA (in Bangalore) I was operated this system...& I got some extra knowledge today..

[@EngineeringMindset]

Thank you, do you know we also have a Hindi channel? kzbin.info/door/g4k338hz9U8jnD5SXPO5jQ

[@solexxx8588]

VRF with heat recovery is the way forward. You can run AC and heat water at the same time with only one VRF/VRV outdoor unit and a manifold and control. You could also cool a refrigerator, a freezer and heat a clothes drier and a hot tub. The load would be shared and the compressor would only provide the needed differential pressure. The compressor ramps up its speed when only heating or cooling.

[@tkacandes2052]

To be clear, you described a theoretical application unless you know about running refrigerant linesets into a clothes dryer or hot tub or refrigerator and I missed that

[@Hoppa12345]

@@tkacandes2052 Daikin build a nice hydrobox for this appliances.... making hot tap water from your VRV system

[@brlinrainf]

Daikin is 1 step forward than other air conditioner brands

[@deineroehre]

@@tkacandes2052 Heat Pump clothes dryers are normal nowadays, so what would stop one from using the central AC/Heating Compressor from providing Heat for the clothes dryer? Of course the lines can't be tied to the dryer directly, so there is some sort of wall-mountes heat exchanger needed, but basically it would work this way.

[@markme4]

This blows my mind how these systems can provide heating and cooling at the same time, not sure I understand it yet but I will keep studying your videos. Thank you

[@gianfavero]

They don't make heat, they move it. That will help you understand

[@markme4]

@@gianfavero Yes, thankyou, I was an AC tech for ten years (UTI grad in 1980) I got out of it back in 90 long before these systems were around. Very interesting and a little more complicated than anything I ever worked on. I'm not understanding how the condenser is performing as the evap and condenser at the same time. I understand heat pumps but this is a little different.

[@JohnnyJr396]

@@markme4 think where you got lost or maybe didn’t hear it from digesting everything else is at 12:00. Mixed mode the outdoor unit isn’t acting like an evaporator. The heat to indoor head is from discharge line and once condensed is sent to other indoor head calling for cooling along with LL from outside .

[@shawnderrick1952]

Not performing as evaporator and condenser at the same time…solenoids controlling flow to make one of the indoor coils a second condenser,so that room gets heat,while other 2 indoor coils are flowing as evaporators.Then the solenoids and electronic TXVs can change refrigerant flow again to make any coil a condenser or an evaporator based on thermostat call.

[@dansmith2863]

@@markme4 Just think of all the units as outdoor units, 8 units all the same being manipulated to what you want. The indoor units are effectively the same as outdoor units. As long as you have a balance in the opposites it will work.

[@Sean-im8bf]

i think the important thing here is the multiple locations of indoor units. i've been trying to think of a way to directly transfer heat away from say, a hot kitchen or server room, and direct to either outdoors or directly to another room as needed / when the heat exchanger handling other rooms may not be experiencing such a temperature

[@james10739]

Seems pretty efficient I just don't know how often I would need that

[@joecephus352]

Going to RACCA ( Refrigeration and Air Conditioning Contractors Association) @ PTC in Pinellas County Florida and my campus has one.

[@pedrowm9399]

Currently implemented on a data conter job I’m on

[@OTechnology]

The example of spraying out of a container should be using canned air not a sprayer. This is a great video though.

[@manuelcurielreyes3666]

Excelent video! Not sure about the location of the pressure gage as reference value for the compressor speed control. I believe that the logic behind the speed control of VRF compressors is much more complex than that. I have been monitoring data from VRF systems and struggling with this concept myself. OEM don’t really share much information about how this control really works. And HVAC installers usually have no clue how this works when you ask them.

[@amirhesamnoroozi3741]

Thank you for your work and helpful info. I have a question. You did explained the VRF system at the refrigerant level for split systems very well. Is it possible to have this VRF system at the water or steam mediator level in chiller systems? I mean one VRF system for the refrigerant loop and one for the water mediator loop. ( Plus ideally a Vav system in the AHU unit ).

[@caffeinatedinsanity2324]

I see a some of these on sites, most notably schools. A major manufacturer of these that I often see is Daikin. Service calls on these are crap because of responsibility disputes because it's a closed architecture as we as the BMS installers, cannot see what's the control logic and what's going on inside. But when properly installed and used as intended, they work fine.

[@marrosyad5340]

I hope you make and upload videos about: - Basic calculations about transistors (BJT, MOSFET, IGBT, JFET) - Basic explanation of thrystor and triac - AC capacitor basic explanation - The simplest logic gate - Arduino basic explanation

[@EngineeringMindset]

See my new MOSFET explained video here➡️: kzbin.info/www/bejne/d6i1e6awmsRso5Y

[@jk-mw4yh]

Thank you always for good videos. Please upload the HVAC video to the sub-Korean channel.

[@mohibquadri4053]

Amazing ! Could u make similar videos on whole MEP subject & Hvac design projects..

[@EngineeringMindset]

We've done a lot on these already. It would probably be far too time consuming to put it all into a single video

[@hpac1009]

Great explanation! Could you do a video explaining 2 pipe heat recovery VRF?

[@brlinrainf]

I don't think you could recover heat with only 2 pipes unless the load is PERFECTLY equal

[@aniket31090]

Please do a video on thermo king & carrier transport refrigeration units.

[@billynomates920]

nice.

[@EngineeringMindset]

Thanks

[@IronTuber727]

Can you do a video explaining CDI ignition systems? :)

[@InverterAlways]

Good video. Don't need check valves I many vrf systems though. But I understand why it was used for demonstration purposes. The ending could use some slight tweaking. Having 4 outdoor units isn't necessary to portray full heat recovery. You can do this with one outdoor. When loads are balanced as you said the outdoor heat exchanger will not be required. It will operate on evaporator or condenser mode based on load differences from heating to cooling indoor zones. Having it shown with 4 outdoor units ruins the underlining message how vrf can do all this from one outdoor. Still. Good video I like the animations. I dont have nearly the resources you guys do to make sweet graphics like this so I'm usually stuck to just explaining things. 😅

[@solexxx8588]

I believe the compressor still runs at low speed to provide differential pressure even when the loads are balanced when there is a call for both heat and cool. I could be wrong but but if the compressor shut down you would have a perpetual heating and cooling machine. I do realize that you have to have active cooling/heating with fans or pumped exchangers.

[@konskats]

When we have more indoor units in heating than cooling ,there is a case to face a problem in liquid line or in condensation? as the pressure changes in liquid line

[@HAMDANI___DISANA22]

Please upload abaut Precision Air Conditioning

[@peterwan小P]

i really wish to have this kind of system in my home such that the heat from my air-con can be used to dry clothes and heat up water. in the winter, well, not much thing here but at least nothing is wasted in summer days and a ton of space for the compressors and additional condenser is saved. the space is precious while the price doesn't really matter much. ( doing anything to save space as well as energy ) the best system i can buy in my country/region is the Daikin VRV S 3Hp unit, which suits this purpose for my home greatly, just that they do not provide any water heater for heat pump system in my region....

[@tennesseehvac670]

I have seen the Daiken VRV's used at DENSO, a car part manufacturing plant that is over 2 million sq/ft.

[@danielcarter491]

Incredible. So with that, I can imagine combining this with geothermal or maybe even heating tap water for even greater efficiency, although cost and maintenance may be dissuading factors. I don't know much about it to be honest, but it seems awash with interesting possibilities.

[@faizanmuneeb6801]

Yup I think daikin does make such a system where it transferd heat from air to water for providing hot water

[@brayancrespo1517]

I think we use water furnaces like this format

[@social3ngin33rin]

@8:40 I'm interested in this, it would be a useful teaching tool for students :) What is it called or where can I buy this at?

[@charlescox290]

"I ❤️ You", how cute.

[@christophebriend]

Great video! Very helpful to understand the possibilities with my future hvac system.. In mixed mode, if the system is primarily cooling, is the temperature you can heat the one heating unit limited by the ambient temperature around the cooling units? (for context: for a system trying to heat domestic hot water at 55C+ while cooling a house at 25-28C) AFAIK you can't transfer heat if the refrigerant temperature is lower than you target temperature, unless you go through another compression cycle, or am I missing something?

[@jetonhaxhia4393]

Not exactly sure what this question is asking, but in general for cooling mode the evaporating temperature is going to be around 6-9c, the condensing temperature around 45-50c. The condensing temperature is always going to be higher than the room temperature in heating and evaporating temperature always lower than room temperature in cooling, otherwise no cooling or heating will happen. There will be low pressure or high pressure alarms which will protect the system in cases like this.

[@Topdailyshows8802]

Wow

[@TanvirKabir0461]

Sir, please make a video on how the car AC and covered van AC or refrigerant system is working.

[@kimosavi1233]

About mid-way through it hit me that the condenser and evaporator units are the exact same thing (simply heat exchangers, and that's why they can work in reverse), and my mind was blown. I never realized that before, but I also don't work in HVAC (so that's my defense).

[@ziaurrehmanafridi6770]

Sir Upload a video of Solar thermal Air Conditioner.

[@rcdd777]

3:17- High pressure Vapour refrigerant should enter to the top row of the condenser assembly, and liquid will emerge from the bottom row.

[@fenflyer]

Danfoss equipment was always good & reliable in refrigeranion systems in the real world commercial refrigeration systems 👍 I will buy you a drink if You can show the real energy inputs / outputs when comparing Air Source heat pump to ground source heat pump 🙄

[@nagarzi81]

Mitsubishi City Multi systems are head and shoulders above the competition in this arena.

[@Troy11194]

With the legalization of marijuana in the state of Michigan, in the past year the company I work for have installed 3 vrf systems in these new marijuana grow facilities. We've also installed them in office buildings and libraries.

[@sathegdeep]

Same question is in my mind, before years ago how to make air cooling unit as a heating unit... Danfose make it comes true🎉

[@Aasif_rind]

Please make video on DX chiller's

[@EngineeringMindset]

Please see our other videos

[@BadHorsie1]

We have them in labs. There are rooms that house freezers and the vrf units provide cooling

[@user-fh5hh8wi6t]

❤❤❤❤❤

[@tomato3347]

What's the cooling load threshold that we should aim for water cooled chiller instead of vfv?

[@paulmcclung9383]

VRF top out around 20 tons. How many compressors can you fit in? As opposed to chiller and boiler. You need to remember that each unit is a maintenance item. That said we used about 70 for a large public building in Maine. Combined with a DOAS.