Heat Recovery VRF System - How it Works
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- čas přidán 7. 09. 2024
- In this video, we will discuss a heat recoveery VRF system. This system allows buildings to recoup heating and cooling losses, thus saving money on energy bills
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hi @Engineering Mindset , can you make a video of capacitor in AC circuit plzz....,i really really need it plzz...
I work on water cooled / air cooled chillers, RTUs, VaVs, split systems, mini splits, boilers, furnaces and VRF systems. VRF is one of the most complicated things you can work on HVAC wise, in theory they are a good idea but they break down a lot more than other systems and some VRFs have triple or quad coils and if you have to change one you have to change all 3 or 4 and littarly take the entire unit apart all the controls you have to have a hand held to shut off the valves just to transfer the gas, especially if it's like a citi multi-pipe they are hell to work on. We were going to do a system that had a leak on one of the coils they told us we had to buy all 3 for 70,000$ or a new system for 100,000 it would take almost 2 or 3 days with guys who know what they are doing to change the coils out it's really labor intensive
Thank you for adding this. I noticed many of the manufacturing sales engineers push for the VRF while a small scale VRF (for single space) can easily be replaced by Heat Pump.
But typically VRF are more expensive systems and they are promoted as super efficient, while they are but if applied in large buildings where energy recovery is often used (for example in hotels when in a normal spring day, you may have cases where mixed conditions existing, heating & cooling @ the same time in different rooms)
Efficiency and economic viability of vrf systems greatly depends on the space where it is installed and the operating conditions.
Is there anything during the building design or installation phase that would make your life easier on these? (Even just having more space in the mechanical room?) Also, is routine maintenance being neglected to cause the coils to fail? What could extend the life of the coils?
Great video. I worked with heat pumps and large Commercial chillers and Building automation systems and variable speed compressors and the key is to have a VFD variable speed compressor to be able to run at low loads. Plus they are a lot more NRG efficient than conventional split phase compressors.
These videos are class and funnily enough explain it better than Daikin who invented the VRV(F)
I truly enjoy your videos for explaining a variety of technical subjects in a concise and illustrated way. Not having much background in HVAC, perhaps in the future you could spell out the acronyms for us non-refrigerant types? Something written in the summary underneath the video and articulate it at the beginning of the video would be great. 🙂
VRF - Variable Refrigerant Flow
VAV - Variable Air Volume
VFD - Variable Frequency Drive
RTU - Rooftop Unit
There's a ton more I've been listing them on the bottom comment sections on his videos or answer people's questions, I do commercial HVAC work and we use their videos in our training class sometimes
Who makes residential units for this type of system?
My hope is to explore thermal storage, and these systems seem to have all the requisite components.
Great short examples on HVACR systems.
I work on engineered systems. Energy management environmental control. Two pipe for pipe blended, mixing boilers chillers .. I do see a need for these where grade is a challenge for a retrofit or an addition
You win! The best explanation I’ve found! Thank you!
Awesome, thank you!
Thanks for the great video. Are there any domestic systems that do heat recovery? I'd love to be able to cool my house and reject the heat in to the domestic hot water system or the pool but all the HR systems I can find are too big for even a moderately large house
Thank you for what you provide for us 😊
It would be interesting to see for this type of AC that able to change heating and cooling. Also, how fast refrigerant liquid turn into gas prior enter the compressor which is in reverse direction.
He has videos out your talking about a heat pump system with a reversing valve that changes the direction the gas flows in the system it turns your evaporator into a condenser and vise versa to be able to heat and cool.
Ditels component 👌👌👌👌👌👌
Please sent next video,
Dibot /mosfet /resister /capacitor /
How work and test and use🌹
See my new MOSFET explained video here➡️: czcams.com/video/AwRJsze_9m4/video.html
Very well explained. Thanks for sharing.
Hi.Like your videos.can you please explain why H.V ac transmission lines make buzzing noise and why does a CFL glow up when placed under them?
excellent production!
It was very useful video👍🏻
hi @Engineering Mindset , can you make a video of capacitor in AC circuit
Very niece sir 😘🇮🇳
Thanks for the information
Thank you 👍
they should make a deep freezer that heats a house in the winter
"hey why the ac is making sounds while the fan is not rotating" - a person standing in front of an heat recovery outdoor unit while the loads are equal
Nice video
Please ditels video ? Mosfet work and use?
See my new MOSFET explained video here➡️: czcams.com/video/AwRJsze_9m4/video.html
Nice
More videos on VRF
We have many already, please see other content
Please darkness sensor
have you actually worked on any of this equipment or just theory
He's just a genius HVAC tech like me 🤷🤣🤦🏆
Very easy to understand. Thank you.
I have worked on this exact system.. It was for a school/training center. It was fun.
Good question Clive
@@eyestosea wow.
Can you share the project details for learning purposes?
If you can,. It'll be helpful
Thank you
Heat *Recoveery*
1st comment after publishing
I am going to be controversial and say that large central VRF systems are not the future.
Actually a lot of commercial building are using VRF systems, I do commercial HVAC I think water or air cooled chillers are best for commercial buildings but there are so many factors that come into play when you design a system for a specific building or business. VRF are very very very expensive to repair and the wait time for parts is 6 to 8 months sometimes they will straight up tell you it's faster and cheaper just to buy a new system. Plus you need a hand heald just to be able to operate it and close/open valves. You can't just hook your guages to it and read pressures it won't be correct if you don't have a 2,000$ hand held you won't be working on VRFs for long. Chillers have been around for years and they are easy to work on, weather it's water or air cooled and most of them have VFDs that control the motor / compressor with over / under load fault protection
@@cameron3991 what about heating?
@@cameron3991 Vrf scroll compressors also comes with vfd na?
I’ve worked in these system and is the most annoying thing to understand
Heat Recoveery? 😅