Comments on: Psychrometrics – Impenetrable Chart or Path to Understanding? https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/ Building science knowledge, HVAC design, & fun Mon, 21 Aug 2023 15:06:17 +0000 hourly 1 https://wordpress.org/?v=6.6.2 By: Kyle DeLory https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8453 Tue, 07 Jul 2015 05:10:48 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8453 In reply to John C.

I find this bold statement to
I find this bold statement to not only be false but offensive because psychometric charts are being taught in trade schools. If you are an instructor and can say that well then maybe you are the problem with your school not teaching this important science if you are the student well you can talk to the faculty above the teachers and remedy this major issue

]]> By: Kyle DeLory https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8454 Tue, 07 Jul 2015 01:10:48 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8454 I find this bold statement to
I find this bold statement to not only be false but offensive because psychometric charts are being taught in trade schools. If you are an instructor and can say that well then maybe you are the problem with your school not teaching this important science if you are the student well you can talk to the faculty above the teachers and remedy this major issue

]]> By: Thomas Del Conte https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8455 Thu, 04 Jun 2015 19:01:13 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8455 If you really would like to
If you really would like to make a contribution to building air tight homes that don’t suck outside water(humidity in), why not address the lowly clothes dryer? Thank you in advance for your reply. ps the condensing dryers cost too much

]]> By: Thomas Del Conte https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8456 Thu, 04 Jun 2015 15:01:13 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8456 If you really would like to
If you really would like to make a contribution to building air tight homes that don’t suck outside water(humidity in), why not address the lowly clothes dryer? Thank you in advance for your reply. ps the condensing dryers cost too much

]]> By: John C https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8451 Wed, 27 May 2015 05:53:41 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8451  
we don
 
we don’t even teach psychrometrics anymore. 
 
now we just show the kids the URL: 
 
http://www.dpcalc.org/

]]> By: Robert Lepage https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8449 Wed, 27 May 2015 02:45:03 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8449 Nice article Allison. But to
Nice article Allison. But to be pedantic, psychrometrics is actually the study of gas-vapour mixes; water vapour just being the most common. 
 

]]> By: John C https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8452 Wed, 27 May 2015 01:53:41 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8452 &nbsp; <br />we don
&nbsp; <br />we don’t even teach psychrometrics anymore.&nbsp; <br />&nbsp; <br />now we just show the kids the URL:&nbsp; <br />&nbsp; <br />http://www.dpcalc.org/

]]> By: Robert Lepage https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8450 Tue, 26 May 2015 22:45:03 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8450 Nice article Allison. But to
Nice article Allison. But to be pedantic, psychrometrics is actually the study of gas-vapour mixes; water vapour just being the most common.&nbsp; <br />&nbsp; <br />

]]> By: Cameron Taylor https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8447 Tue, 26 May 2015 22:14:05 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8447 Your article above is a great
Your article above is a great introduction to an absolutely essential topic for understanding HVAC design and function. Understanding psychrometrics (my mental state as well as the book you mentioned, of which I own a copy) has opened more doors for me than I thought when I first began grappling with a psych chart several years ago. Critical environmental control, building envelope performance, and meteorology are a few of these doors pried open by psychrometrics, among others. There’s even a psychrometric chart for the atmosphere we live in and breath, called a skew-t/log p, a graph I show to my HVAC students when they are tempted to complain how difficult the regular chart might be. 
 
You make a great point that so often this subject is taught by first throwing the student to the big bad wolf of the psychrometric chart, without a prior introduction to basic psychrometric principles, such as evaporation, condensation, latent heat of vaporization and fusion. The more I teach this subject, the more parallels I see between it and refrigeration theory, which also involves vaporization and condensation, and has its own chart known as a Mollier diagram, which I’ve also heard psychrometric charts referred to as. 
 
I don’t know if you’ve ever heard of the Refrigeration Service Engineers Society (RSES) but I am a member, and able to access great information written by fellow members on many HVAC/R subjects. One of the best treatments of psychrometrics apart from the “Understanding Pyschrometrics” book is an RSES SAM article written by Skip Krepcick titled “Practical Applications of Psychrometrics”. I can send you a copy if you’re interested. He taught an eight hour CEU class on this subject at our annual RSES regional conference this past spring and I was in hog heaven. Really increased my understanding and will change how I teach it to my students for the upcoming fall semester.

]]> By: Dale Sherman https://www.energyvanguard.com/blog/psychrometrics-impenetrable-chart-or-path-to-understanding/#comment-8445 Tue, 26 May 2015 22:11:00 +0000 http://energyvanguard.flywheelsites.com/?blog_post=psychrometrics-impenetrable-chart-or-path-to-understanding#comment-8445 Keep in mind that Willis
Keep in mind that Willis Carrier developed the psychrometric chart using a slide rule among other archaic (by today’s standards) tools.  
I used to drive by his estate every day going to work.  
 
His VP and senior researcher, Carlyle Ashley, invented the Weathermaker in 1930, a gas furnace combined with an A/C unit. The psychrometric chart played a key role in its successful operation.  
 
Carlyle, Dick Kornbluth, Larry Kinney, and myself tested the leakiness of a nearby nuke plant’s airlock doors in ’87. Carlyle was an engineer’s engineer and knew more about the psychrometric chart and its fringe applications than perhaps Willis Carrier.  
 
The next time you grab a tall glass of iced tea and contemplate the condensation on the glass, remember that among his many patents, Carlyle also patented the ice cube (US2134544 A). 

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