HVAC Heat Exchangers Explained The basics working principle how heat exchanger works
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Date: 2023-11-17
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Comments and reviews: 27
Mark
You are using the term convection in the wrong application. All of this is conduction. When the hot surface comes into physical contact with the colder air, there is energy transferred by conduction. When two items of physical matter meet with a temperature gradient, that is conduction.
Convection requires physical movement of a fluid. But even with that physical movement, you can not have convection until you conduct the energy first. So all convective heating is just conduction through a fluid. But when that fluid moves, it heats up the fluid next to it, again by conduction. Fluid is matter, so when matter comes into conduct with other matter, that is conduction.
To make this clearer, it is like saying that there are three types of energy sources: Fossil fuels, nuclear, and electric. One is not like the others. Convection does not transfer energy. Convection is what you can call conduction if at least one of the conduction surfaces is a fluid.
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You are using the term convection in the wrong application. All of this is conduction. When the hot surface comes into physical contact with the colder air, there is energy transferred by conduction. When two items of physical matter meet with a temperature gradient, that is conduction.
Convection requires physical movement of a fluid. But even with that physical movement, you can not have convection until you conduct the energy first. So all convective heating is just conduction through a fluid. But when that fluid moves, it heats up the fluid next to it, again by conduction. Fluid is matter, so when matter comes into conduct with other matter, that is conduction.
To make this clearer, it is like saying that there are three types of energy sources: Fossil fuels, nuclear, and electric. One is not like the others. Convection does not transfer energy. Convection is what you can call conduction if at least one of the conduction surfaces is a fluid.
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Tom
Hey man, really interesting video! Thanks for sharing!
I wonder if you have done or would do a video on the relative efficiency of each of these systems and also a video where you compare heat transfer fluids, like air, water and the different refrigerants.
Also if you know about combined cycle electricity generation at low temperatures (home scale with refrigerants) I would love to hear more about that too! I live off grid in Canada so I am always searching for ways to make my homestead more efficient and effective. If I could make electricity from my woodstove in winter, with refrigerants producing power and hot water (when my solar panels are not putting out much power) that would be amazing!
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Hey man, really interesting video! Thanks for sharing!
I wonder if you have done or would do a video on the relative efficiency of each of these systems and also a video where you compare heat transfer fluids, like air, water and the different refrigerants.
Also if you know about combined cycle electricity generation at low temperatures (home scale with refrigerants) I would love to hear more about that too! I live off grid in Canada so I am always searching for ways to make my homestead more efficient and effective. If I could make electricity from my woodstove in winter, with refrigerants producing power and hot water (when my solar panels are not putting out much power) that would be amazing!
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Jim
I don't recognize your use of the word convection. Convection involves the bulk transfer of heat driven by gravity, where temperature differences in a fluid (gas or liquid) correspond to density differences which under the influence of gravity lead to pressure gradients that drive convection currents. Hence hot air rising and cool air sinking, for example. When you drive air through a coil to transfer heat it is predominantly conduction. Maybe HVAC has its own use of the word. Or maybe I'm all wet.
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I don't recognize your use of the word convection. Convection involves the bulk transfer of heat driven by gravity, where temperature differences in a fluid (gas or liquid) correspond to density differences which under the influence of gravity lead to pressure gradients that drive convection currents. Hence hot air rising and cool air sinking, for example. When you drive air through a coil to transfer heat it is predominantly conduction. Maybe HVAC has its own use of the word. Or maybe I'm all wet.
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soundwavs1961c
There's a sugary smell coming out of our ac vents we just had the evaporator coil changed and the condenser. I read the smell is from a cracked heater exchange. My question is: Is the heater exchange located in the evaporator coil? The one we have is the cone shaped one (upside down letter V.
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There's a sugary smell coming out of our ac vents we just had the evaporator coil changed and the condenser. I read the smell is from a cracked heater exchange. My question is: Is the heater exchange located in the evaporator coil? The one we have is the cone shaped one (upside down letter V.
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tmniy
What if the fins get tilted due to some external force and the thin tubing becomes close to each other in the heat exchange system in outer unit of my split ac. Do I need to worry about this? Will it effect the cooling mechanism of my air conditioner? Please respond.
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What if the fins get tilted due to some external force and the thin tubing becomes close to each other in the heat exchange system in outer unit of my split ac. Do I need to worry about this? Will it effect the cooling mechanism of my air conditioner? Please respond.
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andykillsu
Yeah I am sorry but electric resistance heaters like in a hot water heater are not heat exchangers. By definition, you are not exchanging heat between 2 fluids. All you are doing is heat transfer which is not the same as a heat exchanger.
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Yeah I am sorry but electric resistance heaters like in a hot water heater are not heat exchangers. By definition, you are not exchanging heat between 2 fluids. All you are doing is heat transfer which is not the same as a heat exchanger.
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Band
Hey great video, very informative. Not sure if someone has already pointed this out but inlet has been spelt as intlet twice around 5: 30. Also the once on bottom left corner of screen should be outlet right? Simple typing mistake Im sure
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Hey great video, very informative. Not sure if someone has already pointed this out but inlet has been spelt as intlet twice around 5: 30. Also the once on bottom left corner of screen should be outlet right? Simple typing mistake Im sure
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AK.
Thank you very much, good explanations. Sir i am a mushroom farmer. We are using paddy straw. Bleached paddy straws can not dry. which is the best method for drying bleached and cut pieces of paddystraw, we have conveyor roller system?
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Thank you very much, good explanations. Sir i am a mushroom farmer. We are using paddy straw. Bleached paddy straws can not dry. which is the best method for drying bleached and cut pieces of paddystraw, we have conveyor roller system?
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Angel
send help my boss is having me learn hvac so i can fix the system here at work. he had the whole commercial system rewired to be controlled by a nest home thermostat. i need help. send help.
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send help my boss is having me learn hvac so i can fix the system here at work. he had the whole commercial system rewired to be controlled by a nest home thermostat. i need help. send help.
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carl
Please do different videos that explain hvac steam operation, pilot valves, spences, steam traps, drip leg, steam tree and how the process works.
Also the condensate and condensate pumps.
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Please do different videos that explain hvac steam operation, pilot valves, spences, steam traps, drip leg, steam tree and how the process works.
Also the condensate and condensate pumps.
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Mario
Can any one Tell me at what temperature set point the outside air handler unit should be, Im from Houston Texas, the summers are very humid
And winter is not cold like up north.
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Can any one Tell me at what temperature set point the outside air handler unit should be, Im from Houston Texas, the summers are very humid
And winter is not cold like up north.
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Alicia
Hi Paul, your videos are great. Very helpful information. Could you consider slowing down a bit though? Also, any chance you can see about adding a quiz so engineers can earn PDH?
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Hi Paul, your videos are great. Very helpful information. Could you consider slowing down a bit though? Also, any chance you can see about adding a quiz so engineers can earn PDH?
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Akshay
Is there a way to know if you have uploaded any video explianing the LMTD and other methods for/and heat exchanger efficiencies? Please let me know. thanks Paul for everything!
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Is there a way to know if you have uploaded any video explianing the LMTD and other methods for/and heat exchanger efficiencies? Please let me know. thanks Paul for everything!
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Diary
There is no electro-magnetic waves emitted out of Steam Radiators, which indeed heat by radiating. A better description of radiating is Object to Objects heat transfer.
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There is no electro-magnetic waves emitted out of Steam Radiators, which indeed heat by radiating. A better description of radiating is Object to Objects heat transfer.
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Peter
I don't know who this is supposed to be for. I am not a handy person. I found that it went too fast for me, although I did pick up some general concepts.
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I don't know who this is supposed to be for. I am not a handy person. I found that it went too fast for me, although I did pick up some general concepts.
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Mike
13: 50 - what is in the heat pipe, a low pressure water mixture? or is coolant? i. e. something much colder than the cold water entering the device, no?
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13: 50 - what is in the heat pipe, a low pressure water mixture? or is coolant? i. e. something much colder than the cold water entering the device, no?
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rdgk1se3019
Shell & Tube type heat exchangers used to be used on a lot of steam locomotives in the USA. they were known as the Elesco feed water heater.
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Shell & Tube type heat exchangers used to be used on a lot of steam locomotives in the USA. they were known as the Elesco feed water heater.
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MOHAMMAD
Super informative and covering everything. Good job
Appreciate if doing a video about temperature approach in heat exchanger.
Thanks
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Super informative and covering everything. Good job
Appreciate if doing a video about temperature approach in heat exchanger.
Thanks
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Maija
But where does the air going in come from? And the water flowing through the pipes do you put them there or they are bought like that?
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But where does the air going in come from? And the water flowing through the pipes do you put them there or they are bought like that?
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Zak
The radiator converts the temperature by radiation more than convection. It distributes the energy uniformly in the locals and chambers
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The radiator converts the temperature by radiation more than convection. It distributes the energy uniformly in the locals and chambers
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Chris
What a great Chanell, recently started a building systems course and Paul has been a wealth of knowledge. Thank you so much!
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What a great Chanell, recently started a building systems course and Paul has been a wealth of knowledge. Thank you so much!
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Ben
Perfect. Been looking for a thorough explanation on HRV systems (ducted plate) for ages and this video nails it. Thankyou
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Perfect. Been looking for a thorough explanation on HRV systems (ducted plate) for ages and this video nails it. Thankyou
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Luis
I've been studying english for quite some time and I haven't never been capable to pronounce the word water properly.
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I've been studying english for quite some time and I haven't never been capable to pronounce the word water properly.
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Quincee
Snowmobiles have heat exchangers. When the snow kicks up in the tunnel above the track they keep the engine cool.
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Snowmobiles have heat exchangers. When the snow kicks up in the tunnel above the track they keep the engine cool.
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Coffey
Well
I'm excited to see that my country of Denmark actually is well-known for something besides lego and insolin
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Well
I'm excited to see that my country of Denmark actually is well-known for something besides lego and insolin
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jason
Man I wish this vid was made a lot sooner, Could have saved me a lot of research at the beginning of the year! lol
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Man I wish this vid was made a lot sooner, Could have saved me a lot of research at the beginning of the year! lol
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Tony
I skip but then again I'm not going to do that I know you make revenue I just realised. I'll not skip ads
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I skip but then again I'm not going to do that I know you make revenue I just realised. I'll not skip ads
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