How to Read a Psychrometric Chart

A psychrometric chart is a graphical representation of the psychrometric processes of air. These processes include properties such as dry bulb temperature, wet bulb temperature, humidity, dew point, and more.

[@adamahmed52]

Taking HVAC as an elective for my mech eng bachelors. I have a test in 20 mins and Im prepared but sometimes I mix up the lines in my head as the chart was shown to us recently. Thank you for making it clear and consice :)

[@chiraagbohra]

This guy is excellent!!!! I wish he was my professor for thermodynamics!!!!

[@coryhall5957]

I know this wasn't really its intended purpose, but I'm actually watching this video for my chemical engineering thermodynamics class haha. Great explanation!

[@ramonsanchez7748]

Same here lol

[@user-kb4bv6ko2k]

Same here guys.... I hope you both are doing well in your exams cause i suck😂

[@aggelosmard491]

@@user-kb4bv6ko2k οοο Έλληνας. Σε ποια σχολή εισαι;

[@user-kb4bv6ko2k]

@@aggelosmard491 Χημικών Μηχανικών ΑΠΘ φίλε εσύ ;

[@darrinm486]

Industrial Hygiene here.

[@yussefab]

After watching endless of KZbin videos about this topic, I finally found this one which in all honesty is the most clear explanation about this chart, thanks to all the people who work on it so hard

[@ahadajaz674]

Best and most informative video on KZbin regarding psychometric charts. Great job!

[@koowasha]

Sir, You are a great teacher. Your lecture was short, derived logically one after another and to the point!

[@BenSmithHuugs]

Thanks for the great video. Appreciate your time!

[@tioluwanielesho1448]

Thank you for explaining this psychometric chart so well ! ❤❤❤❤

[@manickn6819]

Very good clear description. Thanks.

[@averyyoung8873]

Really well-spoken and understandable thank you!

[@aoknives]

Awesome video! Thank you for the clarity, super helpful.

[@sandiagocity2753]

Thanks for sharing comprehensive information on this topic. Excellent

[@simeonsond4given75]

Very informative, great delivery and well put together. Thank you so much.

[@IceSmash2]

This was an amazing introduction! Thank you

[@europeankid98]

Excellent video, very descriptive. Thank you!

[@jenniferdurhamwong920]

this is helpful for the architecture folks studying for the PDD exam. Thank you.

[@HoodHandyman]

We watced this today in my class . I was confused as shit till I saw this video thanks.

[@TheClinchMagazine]

Damn this guy's way of explaining is awesome.

[@davidspevacek2937]

Awesome video! Was reading about this in my plumbing book. Now I understand it! Great explanation!

[@thisisblackmesa]

awesome explanation of the psychrometric chart!

[@chrstfer2452]

This was awesome! Thanks so much, ive been trying to grok these charts the past week or so and this helped me get my head around it

[@ttriffic03]

Yes this guy is good at explaining propertys of air. When i went to the construction college for pre exam prep 2 years they did convey all this info but not as well. Weird thing as a HVAC contractor for ten years I only knew a small few who would use this kind of data when sizing a system for residential homes, then a change with B&Z required it and they were lost for quite a long time they had to learn manual j and D to draw a plan. I made quite a living during these periods.

[@MegaDee911]

Thanks! very informative, keep them coming.

[@JaykeSapalaran-iq3qs]

All of the video tutorial are very informative 👍 thanks for sharing your knowledge ♥️🇵🇭

[@asbasf2382]

Well explained thnaks Robbie Lawler.

[@beltusnkwawir2908]

Your sense of humor is interesting

[@masoudsheidaei3415]

very very good explaining and examples. thanks

[@salmansabarwal748]

no bs straight to the point, very useful video thanks

[@jollyscaria1922]

Vrey good

[@Katprzk]

I am in my second year of my architecture degree and I have a course dedicated to mechanical, electrical and plumbing in commercial buildings. We started looking at these charts the other day and I was so lost. Thank you so much for this video, it helped so much! You are the best. Thanks!

[@maysaraabdo5339]

Well said thank you.

[@Saint_777]

Great presentation….you made it easy to comprehend 👍🏾👍🏾

[@gozieerondu1992]

I don't work in HVAC but im taking a MechE course right now that discusses this. Been having trouble reading this chart via textbook, so this lesson was perfect, thanks so much!

[@kathymejillano6429]

Text Book is so confusing, rather watch You Tube. I almost complete the engineering textbook, but it does not work well.

[@freddygill3425]

Great video! Very well explained. You said you were going to mention a little about enthalpy. I was wanting to see that too. Thank you!

[@rebekahrodriguez4954]

So good and helpful! Thank you!

[@codypepper94]

Thanks much more clearly explained then engineering professor

[@usamakr]

Very useful information. Thanks for making this video.

[@rasheedaqeel]

Great video. Very easy to follow.

[@joonfanatic2140]

Amazing, thanks for the video !

[@leemontgomery7914]

Really good presentation, thanks!

[@indikasanjeewarupasinghe4662]

Great Video. thank you very much!

[@alocin110]

Well-presented and very educational for highly technical person and for a lay-man like myself. Thank you sir. Great presentation. Liked it.

[@mikailali5888]

Sir! Thank you for the explanation.

[@VISHALMOHAN1993]

You are awesome man.

[@AtliTobiasson]

This man is a master

[@zahidmustafa6368]

Perfect lesson. Thanks

[@brianmcdermott2430]

Great info. video. Thanks.

[@ebrahimsayed6854]

Great video sir.

[@jeremysarver5094]

Great video thanks!

[@chandervideos5082]

Good explanation. thank you!

[@jerryhack5192]

Thank You.

[@marklysaplala2689]

very clear explanation. Big thanks! :)

[@tombouie]

I thinks I got it. In a nutshell: Given a Pchart for a specific barometric pressure, the intersection of any two parameter values is a single point on the Pchart. Given a point on the Pchart, all its parameter values on the Pchart can be easily determined. Thks TomB

[@philipoakley5498]

Great. Would be nice, for some, to start at Relative Humidity section (~6 minutes) , and note the nice big fraction shown in the top left blank area of the chart, and notice that on any vertical 'dry air' temperature line the relative humidity is in nice linear 'tick marks' (going from zero to 100% saturated). And that the way we shift from the current point out to the 'web bulb' (diagonal line) is neatly at right angle to the curves of the relative humidity..

[@user-nw1vo6kl8p]

Thanks a lot!

[@LynneLaRochelle]

Great explanation!

[@tonymedici8414]

Great explanation.

[@klaytonickinson]

Thank you for your explanation! My professor was having trouble teaching us this material without confusing us. 😅

[@ultrafaga1947]

Great job 👍

[@franciscom.morales-gonzale1915]

very good info!!

[@barneylan876]

Awesome !

[@clarkgriswold5842]

Love the thumbnail, thank you!

[@pravious]

Great video! Thank you for sharing this information. What's the model number of that Fluke device? I'm interested in getting a digital humidity/temperature meter as precise as possible? I've noticed how the measurements on the sling might be biased by how consistent the person using it is while rotating it, so a digital one could be a solution. Thanks again.

[@bambamsizzle]

Awesome video Thinks

[@mariumali4852]

this was quality explanation....

[@bikram4you]

Nice explanation 👍

[@Pro_Tech01]

Very helpful thanks

[@joev.6703]

Fantastic presentation! Do you have any more of the charts?

[@tomekc1113]

great video

[@RalphsHeating]

Very nice!

[@thecreaturesdancedlikeus3922]

Thanks!

[@mastablunt]

Going to be reviewing this for my WRT course exam thanks mate

[@BingBong20005]

same reason that I'm viewing lol

[@salehsane3249]

Awsome, tnx🙏

[@levironald9322]

thank you

[@arjunsankar3887]

Exceptional

[@supanaratn7558]

easy to understand.

[@anukpersad4808]

Very good

[@andrewtela803]

Thanks Tyler 1

[@kursatper5912]

Thanks

[@JohnnyJr396]

Thanks!! Can you explain what the vapor pressure in inches of mercury means and how to use it?

[@thesuperiorbench6307]

Great vid :D

[@danielafernandez1493]

God, i have to watch this video for a homework but im afraid to fall in love, this guy is so charming xD

[@TECTubefilms]

We do believe that is how he courted his wife back in the day... the love language of psychrometrics

[@willi7173]

At dew point temperature the condensation begins.

[@jeremyruutel912]

Great job here in laymans terms!

[@bobbritt5904]

IF YOU WANT TO KNOW WHAT THE NUMBERS ON THE Y-AXIS MEAN, READ ON: According to Wikipedia (see LINK1 below) A grain is a unit of measurement of mass, and historically was the mass of a grain of wheat or barley. Apparently, a grain is now defined as 1 grain = 64.79891 milligrams (eq. 1) According to Wikipedia (see LINK2 below) 1 kg = 15432.3487 grains (eq. 2) Therefore 1 g = 15.4323487 grains (eq. 3) In the USA, we measure weight (which is actually force, not mass) in pounds, as in "he weighs 170 lbs". To get a feel for what a "grain" is, we can ask "how many grains in a pound"? There are 453.592 grams in one pound (453.592 g = 1 lb) 1 g = 15.4323487 grains (eq. 3) If we multiply both side of the eq. 3 above by 453.592, we have 453.592 g = 6999.99 (eq. 4) In other words (in round numbers) 1 lb = 7000 grains (eq. 5) So, in this video, the y-axis on the right (which reads 0, 20, 40, 60,...) is "mass of water vapor, measured in grains, divided by mass of dry air, measured in pounds, for a given volume of moist air". The 2nd y-axis on the right (which reads .001, .003, .005,...) is "mass of water vapor divided by mass of dry air, for a given volume of moist air". So it could be "pounds of water per pound of dry air" or "kg of water per kg of dry air". Whenever the presenter says "grains" we could take that number, divide it by 7000, and arrive at pounds. Let's test that out, at 6:00 mins in, we see the "132 gr" arrow is just above 0.19" on the two y-axis's. Let divide 132 by 7000 and we get 0.019 and that's in agreement with his chart, which confirms our understanding!!! LINK1: en.wikipedia.org/wiki/Imperial_and_US_customary_measurement_systems LINK2: en.wikipedia.org/wiki/Grain_(unit) NOTE: If I've made a mistake, reply to this comment and correct it please.

[@TECTubefilms]

KZbin auto-blocked your comment (not sure why... maybe because of the external links). We did not take the time to read your thesis for accuracy, but since you mentioned wheat and barley, Ryan said to go ahead and share your post. He also said to work hops into your next comment somehow.

[@brianoverstreet7390]

How can I get one of those charts? Thank you! Brian

[@derrickgarcia303]

How can I get a copy? On your example of the window. Adding humidity to 30% why will it condense?

[@terrellwilliams6347]

😮❤ I'd like to have 1 of those charts.

[@MarkCarpenterHVAC-me2jg]

Download and laminate a chart. The Insight Partners chart is real nice, because it has the index point on it so you can calculate your sensible heat ratio (SHR)

[@georgedvojacki9770]

You're mentioned you were giving psychrometric chart how do I go about getting one

[@aboreza6680]

In an air washer installation, 100 m3/min of air at 5 oC DBT and 80% relative humidity has to be heated and humidified to 25 oC and 45% of relative humidity by the following processes; (a) preheating, (b) adiabatic saturation in a re-circulated air washer up to 95% relative humidity and then (c) reheat to final state. Calculate: 1. total heat added in kW 2. water mass to be provided to the washer and 3. humidifying efficiency of the air washer. You can find solutions to this question

[@dogehatter7195]

Would love to get a psychometric chart. Great channel, thank you very much.

[@TECTubefilms]

Back when the video was made you used to be able to get them online from the Carrier Bookstore, but they closed that site. You can, however, still get them from your local Carrier distributor.

[@TheClinchMagazine]

Would this help ? >> [www.google.com/url?sa=t&source=web&rct=j&url=www.ashrae.org/File%2520Library/Technical%2520Resources/Bookstore/UP3/SI-1.pdf&ved=2ahUKEwj02oyn0YruAhVL7XMBHUtwARAQFjAAegQIARAB&usg=AOvVaw0bMgvpCZtGI6bOrFbE3gmO]

[@chetnarayangyawali6714]

Could I get e version of psychometric chart please ？

[@crenapun57]

tq

[@Tbm-ov5ky]

do you have a pdf of that chart?

[@amv_pure]

Thanks for the video. What brand and model is that yellow thermograph device you have?

[@TECTubefilms]

Fluke 971

[@amv_pure]

@@TECTubefilms awesome, thanks

[@45KevinG45]

Can i get a laminated chart ?

[@trentjk]

Have "future training modules" been made for moving along the chart to change temperature and humidity?

[@TECTubefilms]

We have not made a short video series, but we do have a 3 hour free training on the Psych chart that does cover that and more. Here is the link to the first 90 minute module of that training - register.gotowebinar.com/register/1045518315942376460

[@timharrison3561]

Were can I find that slide show?

[@gooddeedsleadto7499]

I noticed the line coming into the compressor inside the condensing unit has few inches of rubber hose left on it, rest of line is exposed? Is this line going to sweat in the summer, is it going to affect the performance if I don’t replace the broken insulation? And why? Thanks

[@TECTubefilms]

If... or rather when... that line gets below the dewpoint of the ambient air, it will sweat. Yes, missing insulation affects performance, which is why it was originally insulated. A small amount of insulation missing might not affect it much. The more that is missing, the more the customer may notice a higher energy bill or less cooling capacity.

[@rodeliorivera9934]

You explained the chart very well. Hope you could present the metric version of psychrometric chart. That's what we use here in teaching air conditioning course. Thank you sir.

[@TECTubefilms]

We bet Ryan has not used metric units since college!

[@ryanhoger1]

True... it has been well over 20 years since I had used metric on a daily basis. The U.S. is weird. We teach both IP and SI to kids... then in college it is all SI... but then we send you out into the workforce where absolutely no one uses SI. Then every company has to re-train every college kid they hire how to use IP units again. Crazy.

[@Rocky-me5cw]

Goat