Definitely agree! AC salesmen in my country would always try convince you to buy a bigger unit than what you really need and when you try to explain to them about the concept of humidity with oversized units, they will look at you like you're crazy. What about the inverter units that run continuously? Would they still dehumidify properly even if oversized? One last point though about what you said that only sensible heat is involved at the condenser (no latent heat), isn't latent heat involved whenever a refrigerant changes state? In the case of condenser, when vapor turns to liquid? As far as I know, latent heat exchange is what is doing the 'heavy-lifting' so to say, in any system. Sensible heat is relatively a small part of the equation. At least that's what I've been told. Hope you could clarify. Thank you.
Yes, you are correct, in the refrigeration cycle, there is sensible latent and sensible again. But to the air, it is all sensible. Latent in the refrigerant side is where most of the BTU exchange comes from. The inverter is tricky and depends a lot on the algorithm programmed. Some slow the fan way down and almost flood the evaporator removing a lot of latent heat and very little sense or just enough to match the load. I see ductless with more of an issue on inverters. They do not keep the coil temperature below the dew point for long enough in humid climates. I think their algorithm is more focused on efficiency. But then again the blower wheel is already building up so much growth as it is, more moisture would speed that up even more.
Another great presentation, Ty. One part that wasn’t quite clear to me is your final statement about the outdoor condenser only rejecting sensible heat. Isn’t it the case that the refrigerant is changing state from gas to liquid in the condenser such that latent heat transfer is at play as well? Thanks! - Jim PS: I see that you already addressed my question in your response to Archie. I’m still unclear about the matter but I’ll think about it some more. I think your point is that the outside air itself is not changing state even though the refrigerant inside the condenser is changing state. Am I thinking about this correctly?
Because of the demand hvac companies have rapidly grown over the years. Unlike other industries, HVAC has done a poor job at continuing training and training. Leading many companies today are outside business people who are focused on sales and the bottom line. There is every insensitive for techs to sell but no incentives for them to be better at diagnosing and solving true comfort issues. Others and myself are working an a plan to help smaller businesses focus on the comfort issues customers need instead of selling boxes. A small company cannot compete in selling boxes but they can offer customer comfort home solutions that sales companies can't. There are companies across the country that focus on comfort issues such as humidity all over including Florida. It's just difficult to find them.
@@love2hvac thank you for your personal reply I really enjoy your videos I'm constantly watching to keep my skills honed I own a small ice machine company here in Florida but go back to doing air residential and Commercial to help keep me afloat during these crappy ice machine times no politics intended;-)
If you have Facebook look for 2 groups 1 Housh as a system 2 the HVAC grapevine Also check out articles from Dr Allison Bailes at energy vanguard. He has awesome articles. Richard Sims has some great insight for Florida. And one of my favorites is Genry Garcia. He solves comfort problems for HVAC companies and home owners.
Sounds great if older houses had more insulation. Or they made more vari-flow compressors .🤣🤣 And my house stays at 72° in summer. 76° winter. I like the chill & people coming in and feeling my space conditions! 🤔😃🤣🤣🍺🍺🍺🥃🥃🍇🏌 Stay safe. Retired(werk'n) keyboard super tech. Wear your safety glasses.
Hi Ty, great video. If we are to not air goes in our house to avoid moisture, are we not going to suffocate for lack of oxygen? Learner here, so i am confused. Please enlighten. Thanks.
Great question, we use ERV or OAD to control the air exchange, humidity, and filtration. There is a new book by Allison Bailes called "a house needs to breath, or does it" he covers a lot of these points. We do not want air exchange through the walls as this causes poor IAQ and segregation of the structure.
3 year , 22 year old tech. You, Rick, Chris, and Bryan are top tier for helping us newbies out. I appreciate you man🖤
Ty you always have the most informative videos you deserve way more subscribers
You’re blasting out these great videos faster than I can keep up with my little free time multitasking four things at once
Glad you like them! They will be there when your ready, no need to rush
You are just blasting out the knowledge in a very precise and approachable manner - It’s amazing!! Thank you!!
Thank you for producing these videos for us! It has given me a greater respect for the HVACR trade.
Thanks I appreciate your channel. When I forget the fundamentals I keep coming back here.
Ur energy will skyrocket
Definitely agree! AC salesmen in my country would always try convince you to buy a bigger unit than what you really need and when you try to explain to them about the concept of humidity with oversized units, they will look at you like you're crazy.
What about the inverter units that run continuously? Would they still dehumidify properly even if oversized?
One last point though about what you said that only sensible heat is involved at the condenser (no latent heat), isn't latent heat involved whenever a refrigerant changes state? In the case of condenser, when vapor turns to liquid? As far as I know, latent heat exchange is what is doing the 'heavy-lifting' so to say, in any system. Sensible heat is relatively a small part of the equation. At least that's what I've been told. Hope you could clarify. Thank you.
Yes, you are correct, in the refrigeration cycle, there is sensible latent and sensible again. But to the air, it is all sensible. Latent in the refrigerant side is where most of the BTU exchange comes from.
The inverter is tricky and depends a lot on the algorithm programmed.
Some slow the fan way down and almost flood the evaporator removing a lot of latent heat and very little sense or just enough to match the load.
I see ductless with more of an issue on inverters. They do not keep the coil temperature below the dew point for long enough in humid climates. I think their algorithm is more focused on efficiency. But then again the blower wheel is already building up so much growth as it is, more moisture would speed that up even more.
Another great presentation, Ty. One part that wasn’t quite clear to me is your final statement about the outdoor condenser only rejecting sensible heat. Isn’t it the case that the refrigerant is changing state from gas to liquid in the condenser such that latent heat transfer is at play as well? Thanks! - Jim
PS: I see that you already addressed my question in your response to Archie. I’m still unclear about the matter but I’ll think about it some more. I think your point is that the outside air itself is not changing state even though the refrigerant inside the condenser is changing state. Am I thinking about this correctly?
Yes you are correct. The refrigerate is changing state, the air is not.
I love that your thinking about it!
Florida resident Florida Tech people overlooked the fact of humidity every time I'm there
Because of the demand hvac companies have rapidly grown over the years. Unlike other industries, HVAC has done a poor job at continuing training and training. Leading many companies today are outside business people who are focused on sales and the bottom line. There is every insensitive for techs to sell but no incentives for them to be better at diagnosing and solving true comfort issues.
Others and myself are working an a plan to help smaller businesses focus on the comfort issues customers need instead of selling boxes. A small company cannot compete in selling boxes but they can offer customer comfort home solutions that sales companies can't.
There are companies across the country that focus on comfort issues such as humidity all over including Florida. It's just difficult to find them.
@@love2hvac thank you for your personal reply I really enjoy your videos I'm constantly watching to keep my skills honed I own a small ice machine company here in Florida but go back to doing air residential and Commercial to help keep me afloat during these crappy ice machine times no politics intended;-)
If you have Facebook look for 2 groups
1 Housh as a system
2 the HVAC grapevine
Also check out articles from Dr Allison Bailes at energy vanguard. He has awesome articles.
Richard Sims has some great insight for Florida.
And one of my favorites is Genry Garcia. He solves comfort problems for HVAC companies and home owners.
John Gorrie would be proud of you!
Sounds great if older houses had more insulation.
Or they made more vari-flow compressors .🤣🤣
And my house stays at 72° in summer.
76° winter.
I like the chill & people coming in and feeling my space conditions!
🤔😃🤣🤣🍺🍺🍺🥃🥃🍇🏌
Stay safe.
Retired(werk'n) keyboard super tech.
Wear your safety glasses.
I love those older homes, I'm looking at air sealing and in the wall insulation.
I look forward to meeting you one day.
Hello professor. What is your advice for best performance car cooling and dehumidification. Is fresh air or recirculation best?
Simply recirculate most of the time.
However it would depend on the indoor dewpoint temperature and the outdoor dew point temperature.
This is for AC but the same science applies
www.energyvanguard.com/blog/when-is-the-humidity-low-enough-to-open-the-windows/
@@love2hvac thank you sir.
Hi Ty, great video. If we are to not air goes in our house to avoid moisture, are we not going to suffocate for lack of oxygen? Learner here, so i am confused. Please enlighten. Thanks.
Great question, we use ERV or OAD to control the air exchange, humidity, and filtration.
There is a new book by Allison Bailes called "a house needs to breath, or does it" he covers a lot of these points.
We do not want air exchange through the walls as this causes poor IAQ and segregation of the structure.
Ty , What is the ideal humidity level we are trying to maintaining homes or office?
30-60%
Ideal 40-50%
So if the 600sqft per ton of cooling is not accurate im wondering what sizing you would use? Half ton smaller or a full one ton smaller of an ac?
Neither, perform a heat load calculation. I will post some links
www.acca.org/standards/approved-software
This Big House Cools with ONE Small Air Conditioner
www.linkedin.com/pulse/big-house-cools-one-small-air-conditioner-nate-adams
www.energyvanguard.com/blog/air-conditioner-sizing-rules-of-thumb-must-die/
www.greenbuildingadvisor.com/article/manual-j-load-calculations-vs-rules-of-thumb
www.achrnews.com/articles/98411-blower-doors-the-next-most-important-contribution-to-hvac
Humidity