Too many architects rely on mechanical engineers to solve these issues. As an architect, I design buildings to minimize the need for, and size of, mechanical systems from the start. Almost all mechanical engineers love this.
Metabolic rate is more then activity related. I find it confortable from 18 to 20-21 C, some just are freezing, even at 23-24C, while sitting. The body adapts to temperature quite well, given proper time and constance. I find that is summer, 20 is a bit cool, not moving, but in winter, when it's -30, a find a 15C just about as cold. Then there are some people are just 'build' for warmer or colder temperatures...
Feel like a static isometric with the high velocity path being highlighted would have been easier to visualise, than a scrolling section view. otherwise helpful, also was looking forward to the ashrae chapter regarding thermal comfort to be highlighted.
One thing I find interesting is how different rooms feel differently even at the same temp. For example I always find at work it feels colder than at home, even at a given temp. 23 at home feels boiling hot and I'll be sweating, but 23 at work feels cold. I guess the humidity and the air velocity might play a role. At home there is less air velocity and more humidity while at work there's constant airflow and low humidity. We actually have a 3 phase 208v humidifier but it can't keep up! It's never ran well though... it spends more time in clean cycle than actually putting out.
The size of the room and the way the insulation act in the interior deflecting the radiant heat may effect the thermal sensation at any given temperature. In short explanation, the further away you are from a well insulated surface the coolest one can stay, to confirm just try to keep your hands cool inside a well insulated styrofoam cooler without any ice inside and you are just going to feel more warm because it deflect back our own body temperature.
Don’t overlook that different people require different temperatures to feel comfortable! 72 degrees at 35 to 40 rth. Is a laboratory perfect environment, however some people like it hot dry some people like it cold and wet , the goal is a baseline of 72 degrees with a relative humidity of 35 degrees! Impossible to achieve to exact but a great baseline for engineers to accommodate 😂no matter what geographical orientation you have to climates 😂 one person to figure out how to make hundred’s of different personalities of comfortably with pre existing equipment design to obtain one goal 72 degrees with relative humidity of 35 to 40 ????
Engineers get it close as possible but then buildings add or remove after the original layout! Then smart engineers have to figure out how to accommodate proper IAQ with pre existing equipment to a space that’s been changed from original design for air flow and heat load! What building engineers are lazy? Hell no we constantly figure how to make a building achieve this after build outs, remolding, change,etc! You see building engineer eating lunch, know he can’t even taste the food, just to occupied thinking how he won’t loose the building to uncomfortable and poor indoor air Quality!!!!
The occupants within the room experience different conditions in the bad design, one will be cold and probably become unwell from the high velocity cold air falling on them. In the good design all occupants experience the same temperature and air velocity
Le maintenance guy. Office set at 68 to 70 Gets new office employee She be like I'm cold 'its freezing in here' You were told about the temp of the office during the interview correct? Well yes but that thermostat is wrong! Me, wiping a disgusting bucket of sweat off of my forehead, you can always wear a jacket or something. "It doesn't match my summer cloths"
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I’m an MEP engineer. Thank you for these! They explain these systems to my new hires better than I can.
Glad you find them useful
Too many architects rely on mechanical engineers to solve these issues. As an architect, I design buildings to minimize the need for, and size of, mechanical systems from the start. Almost all mechanical engineers love this.
This explains best why Kevin from "The Office" sets the thermostat to 69°F (20.5°C). He's comfortable with room temperature.
I’m not sure what the weather is like where you are but the fact that you reintroduced this video today is hilarious
These videos are brilliant thank you. Coffee coming your way to help make more!
Glad you enjoyed it and that it helped you. Thank you for helping support us, it's really much appreciated
Metabolic rate is more then activity related. I find it confortable from 18 to 20-21 C, some just are freezing, even at 23-24C, while sitting. The body adapts to temperature quite well, given proper time and constance. I find that is summer, 20 is a bit cool, not moving, but in winter, when it's -30, a find a 15C just about as cold. Then there are some people are just 'build' for warmer or colder temperatures...
Adaptive thermal comfort
Everyone feels comfortable at different temperatures
Very informative and useful channel. Thank you very much!
Feel like a static isometric with the high velocity path being highlighted would have been easier to visualise, than a scrolling section view. otherwise helpful, also was looking forward to the ashrae chapter regarding thermal comfort to be highlighted.
Nice video!! You made an easy way to explain the basic concepts of thermal engineering... waiting your video of psichrometric chart.
Regards!!
Im glad that i have subbed to your channel. Very much informative. Thanks for all the efforts
Can you please cover in detail pyschrometric chart next. Appreciate your work 👍
Lennox NAS uses these training videos to teach their technicians nation wide.
Please contact me about this via our website
Thanx for the video...its really useful..👍
You're welcome, glad you enjoyed
One thing I find interesting is how different rooms feel differently even at the same temp. For example I always find at work it feels colder than at home, even at a given temp. 23 at home feels boiling hot and I'll be sweating, but 23 at work feels cold. I guess the humidity and the air velocity might play a role. At home there is less air velocity and more humidity while at work there's constant airflow and low humidity. We actually have a 3 phase 208v humidifier but it can't keep up! It's never ran well though... it spends more time in clean cycle than actually putting out.
The size of the room and the way the insulation act in the interior deflecting the radiant heat may effect the thermal sensation at any given temperature. In short explanation, the further away you are from a well insulated surface the coolest one can stay, to confirm just try to keep your hands cool inside a well insulated styrofoam cooler without any ice inside and you are just going to feel more warm because it deflect back our own body temperature.
All factors are connected together like a chain including HAVC system type...etc
Sir thanks for information, please do video on how to calculate cfm if blowers
Is there a formula to calculate Asharae 55 comfort index??
Welcome back
1:10 Actually the first thing in mind is the furniture..
But yeah, I see your point
sir, please explain heat load calculation E20 along with HAP & ESP of ducts, Pipe please.....
Can you take up the topic of scale formation and counter measures?
We have talked about this for chillers previously in the chiller efficiency video, also briefly in the heating systems video
Thank you
How about air quality?
and may I know from where the CIBSE guide A and ASHRAE can be downloaded?
You have to either buy them or borrowing
Do like to share this video please.
I don’t see the duct design video in your channel.
It's also on our website theengineeringmindset.com/hvac-design/
BUT HOW MANY DUCKS COULD A DUCT DESIGN IF A DUCK COULD DESIGN A DUCT
The Engineering Mindset Thank you
As an engineer, you are not gonna dedign a perfect HAVC system that everybody would satisfied with.
Don’t overlook that different people require different temperatures to feel comfortable! 72 degrees at 35 to 40 rth. Is a laboratory perfect environment, however some people like it hot dry some people like it cold and wet , the goal is a baseline of 72 degrees with a relative humidity of 35 degrees! Impossible to achieve to exact but a great baseline for engineers to accommodate 😂no matter what geographical orientation you have to climates 😂 one person to figure out how to make hundred’s of different personalities of comfortably with pre existing equipment design to obtain one goal 72 degrees with relative humidity of 35 to 40 ????
Engineers get it close as possible but then buildings add or remove after the original layout! Then smart engineers have to figure out how to accommodate proper IAQ with pre existing equipment to a space that’s been changed from original design for air flow and heat load! What building engineers are lazy? Hell no we constantly figure how to make a building achieve this after build outs, remolding, change,etc! You see building engineer eating lunch, know he can’t even taste the food, just to occupied thinking how he won’t loose the building to uncomfortable and poor indoor air Quality!!!!
But why is the bad design the bad design? I don't get it.
The occupants within the room experience different conditions in the bad design, one will be cold and probably become unwell from the high velocity cold air falling on them. In the good design all occupants experience the same temperature and air velocity
Huh? 20c? My home is 17/18 😂
Le maintenance guy.
Office set at 68 to 70
Gets new office employee
She be like I'm cold 'its freezing in here'
You were told about the temp of the office during the interview correct?
Well yes but that thermostat is wrong!
Me, wiping a disgusting bucket of sweat off of my forehead, you can always wear a jacket or something.
"It doesn't match my summer cloths"
Sab chochale hai
i_spy
i_spy
Well spotted
i_spy