VRF Systems Explained - Variable refrigerant flow basics HVAC
video description
Date: 2023-11-17
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Comments and reviews: 30
Inverter
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.
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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.
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Peter
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.
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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.
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christophe
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?
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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?
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engineering_mindset
VrFs are a lot harder to work on and you need a controller to charge the unit there are certain valves that open and close on the condensing unit and it makes it to where you can not recover / charge a until without the 2, 000$ Contoller. I usually see them in New commercial buildings and schools I work on them from time to time but 90% of parts are on 6 month backorder so if it breaks down they'll just tell you wait 6 months or buy a new 50, 000$ to 75, 000$ condenser
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VrFs are a lot harder to work on and you need a controller to charge the unit there are certain valves that open and close on the condensing unit and it makes it to where you can not recover / charge a until without the 2, 000$ Contoller. I usually see them in New commercial buildings and schools I work on them from time to time but 90% of parts are on 6 month backorder so if it breaks down they'll just tell you wait 6 months or buy a new 50, 000$ to 75, 000$ condenser
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Andy
Excellent presentation, this is one of the best explanations Ive seen in my 44 years in refrigeration and air conditioning. What most people dont know, is that all refrigeration systems are heat pumps, the term suddenly appeared about 20 years ago, I dont know where it came from, I suppose its easier than saying Reverse Cycle Air Conditioner.
Before they were developed we had electric heating elements, hot water or steam heating, that was fun, dealing with steam valves and R22.
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Excellent presentation, this is one of the best explanations Ive seen in my 44 years in refrigeration and air conditioning. What most people dont know, is that all refrigeration systems are heat pumps, the term suddenly appeared about 20 years ago, I dont know where it came from, I suppose its easier than saying Reverse Cycle Air Conditioner.
Before they were developed we had electric heating elements, hot water or steam heating, that was fun, dealing with steam valves and R22.
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Brendan
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!
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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!
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Manuel
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 dont really share much information about how this control really works. And HVAC installers usually have no clue how this works when you ask them.
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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 dont really share much information about how this control really works. And HVAC installers usually have no clue how this works when you ask them.
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Solexx
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.
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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.
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Persoana
VRF heat recovery should be inside any AC to Dehumidify the air without cooling down the room.
My shitty Daikin Prefera managed to freeze up the room on Dry Mode.
Everything looks efficient, but if you compressor is down, everything is down.
If you have a refrigerant leak, everything is down.
It looks efficient on paper.
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VRF heat recovery should be inside any AC to Dehumidify the air without cooling down the room.
My shitty Daikin Prefera managed to freeze up the room on Dry Mode.
Everything looks efficient, but if you compressor is down, everything is down.
If you have a refrigerant leak, everything is down.
It looks efficient on paper.
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Sean
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
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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
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Anshal
in my office, im an electrical engieer and have Family business of AC since last 8 years, when i started my job in december everyone was freezing when they came in office, once i arrived i used to crank whole office AC units up to 30 C, they gave my business the contract from there on forward
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in my office, im an electrical engieer and have Family business of AC since last 8 years, when i started my job in december everyone was freezing when they came in office, once i arrived i used to crank whole office AC units up to 30 C, they gave my business the contract from there on forward
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Daniel
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.
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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.
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KimoSavi
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.
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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.
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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
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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
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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
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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
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MAR
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
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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
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Gururaj
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.
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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.
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sherif
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.
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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.
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Troy
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.
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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.
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Ben
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.
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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.
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Eric
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 cant be the only one being thrown off by the R-410a tank being the R-22 green color right? Lol
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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 cant be the only one being thrown off by the R-410a tank being the R-22 green color right? Lol
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12345fowler
I liked your swiss cross at the front of your hospital. YOu probably wanted to use the red cross symbol but this one is oppsoite to the swiss cross, i. e. red cross (as the name implies) with a white background.
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I liked your swiss cross at the front of your hospital. YOu probably wanted to use the red cross symbol but this one is oppsoite to the swiss cross, i. e. red cross (as the name implies) with a white background.
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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
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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
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Beezy
I've seen a VRF used in a house that's been converted over to apartments. not worth it honestly. cause you got someone that ALWAYS TURNS OFF THE MAIN UNIT. thus shutting down the rest of the house's cooling/heating.
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I've seen a VRF used in a house that's been converted over to apartments. not worth it honestly. cause you got someone that ALWAYS TURNS OFF THE MAIN UNIT. thus shutting down the rest of the house's cooling/heating.
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EspHack
and if we had gone full nuclear since the 70's, we could just decorate walls with peltier pads and have it cold/hot as easy as turning lights on and off, 0 nvh, 0 pressurized lethal gases, the dream, f efficiency
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and if we had gone full nuclear since the 70's, we could just decorate walls with peltier pads and have it cold/hot as easy as turning lights on and off, 0 nvh, 0 pressurized lethal gases, the dream, f efficiency
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engineering_mindset
are you sure a VRF system can supply heating cooling at the same time? I believe this information is wrong. I VRF heat recovery suystem can supply heating and cooling at the same time.
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are you sure a VRF system can supply heating cooling at the same time? I believe this information is wrong. I VRF heat recovery suystem can supply heating and cooling at the same time.
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Abdulaziz
in my knowledge vrf used in hospitals in winter season. the medicine & chemical store in cool place and the other side in the cool season we need heat for human comfort.
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in my knowledge vrf used in hospitals in winter season. the medicine & chemical store in cool place and the other side in the cool season we need heat for human comfort.
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Johnny
Just sent you a little appreciation. Thanks for this video. Ive watched a few try to explain and even they stumbled. You truly are a master at explaining complicated tech.
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Just sent you a little appreciation. Thanks for this video. Ive watched a few try to explain and even they stumbled. You truly are a master at explaining complicated tech.
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Jack
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!
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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!
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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?
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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?
reply
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