Hijend Hotel Lobby and Administration AHU Minimum Outdoor Air Percentage Estimate Exercise
The files below are the answer to the exercise using the psych chart to determine the minimum outdoor air percentage for the Lobby and Administration Area AHU in the Hijend Hotel. The answer is illustrated on three different forms of the electronic psych chart. The .pdf files are just that. The .hdd and .aad files are the files that you would use to open the answer in the actual phsych chart software. The data table file is the same for all charts.
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PDF and Image Psych Charts
The files below are blank psych charts in a number of different publicly available forms that you can download and use to work with a psych chart manually, either by printing it and actually writing on it (like we did in the olden days) or by inserting it into a PowerPoint or similar application and using the application drawing tools to work on it.
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If you would like to try your hand at an electronic chart, this blog post will give you link to a free one you can use along with guidance on how to use it.
Joseph Olivieri Book Chapters
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The files below are scans from chapters in a book by Jospeh Olivieri titled How to Design Heating Cooling Comfort Systems. The copyright is 1973, and many would say the book is outdated.
And while that is true in some ways, given what we have learned since then, and the many wonderful tools we have, in particular, personal computers and their related software, the principles behind those tools are the same principles discussed in the book. And, thus, from my perspective, the book is still relevant. |
I learned a lot from the book and part of the reason I feel it is relevant is that the concepts are discussed in a simpler context than the current one. And for me, as a person who came into the industry from outside of it, that made them much more approachable. An experience I had with the book when I was a Facilities Engineer at Komatsu Silicon America's Hillsboro, Oregon plant tended to affirm that.
More specifically, at that plant, I worked with some very gifted operators. But for many, their backgrounds did not include a lot of HVAC exposure. As a result, in my attempts to explain things to them, I would share my copy of the book with them. At one point, I realized that my copy now had a permanent home down in the control room and it was kind of a pain for me when I wanted to reference it myself. So, I bought them their own copy so that I could bring mine back to my bookshelf.
What I took from that was that others, who like me, came into HVAC without formal training in it, found the way the concepts like loads and psychrometrics and duct and pipe sizing were presented to be approachable and understandable. Sure, we could and should do a more precise job of it now. But to do that, we needed to be grounded in the fundamentals and this book, for me, and the evidence would suggest, for the operating team I worked with at KSA did just that.
You can still find used copies of it around, and if you are doing work in this industry and came into it without a formal HVAC background, you may want to invest in one. Meanwhile, I have placed scans of the chapters that I share the most below.
More specifically, at that plant, I worked with some very gifted operators. But for many, their backgrounds did not include a lot of HVAC exposure. As a result, in my attempts to explain things to them, I would share my copy of the book with them. At one point, I realized that my copy now had a permanent home down in the control room and it was kind of a pain for me when I wanted to reference it myself. So, I bought them their own copy so that I could bring mine back to my bookshelf.
What I took from that was that others, who like me, came into HVAC without formal training in it, found the way the concepts like loads and psychrometrics and duct and pipe sizing were presented to be approachable and understandable. Sure, we could and should do a more precise job of it now. But to do that, we needed to be grounded in the fundamentals and this book, for me, and the evidence would suggest, for the operating team I worked with at KSA did just that.
You can still find used copies of it around, and if you are doing work in this industry and came into it without a formal HVAC background, you may want to invest in one. Meanwhile, I have placed scans of the chapters that I share the most below.
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This is the chapter on loads, which includes an example load calculation. If you read the first part of it, it will give you a sense of what is involved with a load calculation. And it includes all of the tables you need to do what we would now consider a very primitive load calculation. But if you take the time to try it, or follow through the example, personally, I think it will ground you in the concepts a bit.
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This is the chapter on psychrometrics. which also includes examples. The concepts are explained in what I feel is a very straightforward manner.
So, even if you are using one of modern electronic psych charts, using this chapter as a self-study tool by working the problems on your electronic chart and then comparing your results to the results provided will help you build your skills.
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