Building Hydronic Systems — Pressure Profile — For HVAC Project Managers

This post is in 2 parts.

Part-1 we deal with the theory.  The basic Hydrostatic equation and the Bernoulli’s equation.

I have used the customary US engineering units throughout.  This is mostly because almost all texts these days have a detailed SI units treatment of these equations and very little or none in IP units.

This is a big disadvantage for young engineers joining the HVAC field.  Hopefully this will help.


Building Hydronic Pressure Profile Part-1

Building Hydronic Pressure Profile Part-2




Psychrometric Concepts for HVAC Project Managers Part-1B

This is where I discuss the concept of VAPOR PRESSURE in detail.   Vapor Pressure is without any doubt the most important psychrometric property that needs to be understood for the HVAC engineer trying to learn psychrometrics.  It is bizarre that many students are going through “Psychrometric Chart”  training without even talking about Vapor Pressure.  The fact that ASHRAE chose not to show this property on their standard chart may have something to do with this trend.  You can “draw process lines” on the charts without any mention of Vapor Pressure but the penalty you pay is a loss of key underlying psychrometric concepts.

As usual conversion from PowerPoint to PDF and no narration leaves out a lot.  But I think the following will still be very helpful to new engineers.

Please send in your comments and corrections to me.  Thank you.

Psychrometry Part1-B

Psychrometric Concepts for HVAC Project Managers Part-1A

This post is the first in a series of 4 (maybe more) PowerPoint presentations that I am doing for my Company engineers about Pschrometry.

Without the benefit of narration it loses some of its usefulness.  But I still think it can be very useful for anyone in the HVAC field trying to learn the subject for the first time.

Note that on the top left corner there is a little notes button that has some more comments on the slide.


fachgesprach-5 1A

Pump Cavitation – A look Under The Hood

The original talk on this topic was a Power Point presentation.  The PDF attached does not have the benefit of the verbal commentary along with the slides.But it still conveys some key concepts and should prove useful.  (There is some “inside” humor sprinkled around, as the original was intended for my own Company Project Engineers – please ignore.)


Pump Cavitation NPSH

PID Control Concepts – Without Calculus! — Part – 2 INTEGRAL

Here is Part-2, which describes the “Integral” component of the PID control.  Some diagrams need a little work, and will be updated a little later.

Please open the pdf below and then come back here for comments:

20140301CHAPTER-4 integral