Heat Recovery VRF System - How it Works
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Date: 2023-11-17
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Comments and reviews: 8
engineering_mindset
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
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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
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Powertrain
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.
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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.
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yuri
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.
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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.
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speedmytube
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
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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
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education
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
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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
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The
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.
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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.
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Brendan
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.
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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.
reply
Ingenium
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?
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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?
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