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<h1>
Introducing Psychrometrics CLI
</h1>
<div class="-mt-6">
<div class="text-gray gray-links text-sm">
<span class="border-r border-gray pr-2 mr-2">September 18, 2023</span>538 words, posted in <a href="/articles/tag/hvac/">HVAC</a>, <a href="/articles/tag/psychrometrics/">psychrometrics</a> and <a href="/articles/tag/software/">software</a>
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<p>Today, I’m releasing a command line application that is built on top of my
<a href="https://github.com/swift-psychrometrics/swift-psychrometrics">swift-psychrometrics</a> package, that I open sourced over 2 years ago.</p>
<p>The application consists of many calculations / conversions for psychrometric properties of an air stream. The tool works for both imperial
and metric units. The application will work natively on macOS, but can also be ran through a <code>docker</code> container on other platforms.</p>
<h2>Why</h2>
<p>I spend a lot of time in my terminal, because I can work so much more efficiently. I discovered many years ago that the more I can do using
simple applications and keyboard over a mouse and a web browser or native application the more I can accomplish. I understand this is
intimidating for many who think they are <em>“not good with computers”.</em> I can assure that was me several years ago, I would only encourage you
to not be afraid and give it a shot. We are at a time in society where it is easier than ever to get informed and learned new skills.</p>
<h2>Installation</h2>
<p>For complete installation instructions, you can view the <a href="https://github.com/swift-psychrometrics/psychrometrics-cli">github</a> repository.</p>
<p>The following instructions are based on using macOS.</p>
<h3>Open your terminal application.</h3>
<p>Personally, I use <a href="https://iterm2.com/">iTerm2</a>, however you can use the default <code>Terminal</code> app. Found at
<code>/Applications/Utilities/Terminal.app</code>.</p>
<h2>Install Homebrew</h2>
<p>We use <a href="https://brew.sh">Homebrew</a> for package distribution of the pre-built application binaries. You can follow their instructions to
install.</p>
<h3>Tap our custom formula tap.</h3>
<pre><code class="language-bash">brew tap swift-psychrometrics/formula
</code></pre>
<h3>Install the psychrometrics application</h3>
<pre><code class="language-bash">brew install psychrometrics
</code></pre>
<p>That’s it!</p>
<h2>Usage</h2>
<p>I will run through a couple of the commands that are supplied with the application and show what you can expect the outputs to be.</p>
<h3>Properties</h3>
<p>The following command will output a bunch of the psychrometric properties of an air stream. There are several ways to call it, but generally
you will supply the dry bulb temperature and the relative humidity.</p>
<p>Below, we calculate the psychrometric properties based on 75°F and 50% humidity.</p>
<pre><code class="language-bash">psychrometrics --dry-bulb 75 --relative-humidity 50
</code></pre>
<p><img src="/articles/images/2023-09-18-properties.png" alt="properties-output" /></p>
<h3>Dehumidifier Sizing</h3>
<p>If you’ve read some of my recent articles on calculating the
<a href="https://mhoush.com/posts/sizing-dehumidifier-by-latent-load/">dehumidifier size required based on the latent load</a>, the application also
ships with a calculation that will do this for you and has the ability to calculate it at different <code>coverages</code> that you can supply.</p>
<p>For example if we’ve done a load calculation and determined that we have a latent load of <code>4,334 BTU/h</code> then we could run the following
command to see what size dehumidifier is needed for <code>100%, 85%, and 70%</code> of the latent load.</p>
<pre><code class="language-bash">psychrometrics dh size --coverage 100 85 70 --verbose 4334
</code></pre>
<p><img src="/articles/images/2023-09-18-dh-size.png" alt="dh-size" /></p>
<h3>Pounds of Water Removed</h3>
<p>I also recently wrote an article about <a href="https://mhoush.com/posts/pounds-of-water-removed/">calculating the pounds of water removed</a> from an
air stream given the grains of moisture removed.</p>
<p>Below is an example of calculating the pounds of water removed per hour based on the example in the article (14 delta-grains)</p>
<pre><code class="language-bash">psychrometrics dh pounds-removed --delta 14 --cfm 797 --verbose
</code></pre>
<p><img src="/articles/images/2023-09-18-pounds-removed.png" alt="pounds-removed" /></p>
<h3>Help</h3>
<p>You can use <code>--help</code> option to show help and the list of commands provided.</p>
<p><img src="/articles/images/2023-09-18-help.png" alt="help" /></p>
<p>If you have any questions then feel free to email or message me. I hope some of you may find this application useful.</p>
</article>
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Michael Housh
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HVAC business owner with over 27 years of experience. Writes articles about HVAC,
Programming, Home-Performance, and Building Science
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