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mhoush: Introducing Psychrometrics CLI
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<meta content="Today, I’m releasing a command line application that is built on top of my
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swift-psychrometrics package, that I open sourced over 2 years ago.
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The application consists of many calculations / conversions for psychrometric properties of an air stream...." name="description"/>
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<h1>
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Introducing Psychrometrics CLI
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</h1>
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<div class="-mt-6">
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<div class="text-gray gray-links text-sm">
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<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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</div>
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</div>
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<img alt="banner" src="http://localhost:3000/articles/images/2023-09-18-introducing-psychrometrics-cli.png"/>
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<p>Today, I’m releasing a command line application that is built on top of my
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<a href="https://github.com/swift-psychrometrics/swift-psychrometrics">swift-psychrometrics</a> package, that I open sourced over 2 years ago.</p>
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<p>The application consists of many calculations / conversions for psychrometric properties of an air stream. The tool works for both imperial
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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>
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<h2>Why</h2>
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<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
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simple applications and keyboard over a mouse and a web browser or native application the more I can accomplish. I understand this is
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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
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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>
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<h2>Installation</h2>
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<p>For complete installation instructions, you can view the <a href="https://github.com/swift-psychrometrics/psychrometrics-cli">github</a> repository.</p>
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<p>The following instructions are based on using macOS.</p>
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<h3>Open your terminal application.</h3>
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<p>Personally, I use <a href="https://iterm2.com/">iTerm2</a>, however you can use the default <code>Terminal</code> app. Found at
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<code>/Applications/Utilities/Terminal.app</code>.</p>
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<h2>Install Homebrew</h2>
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<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
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install.</p>
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<h3>Tap our custom formula tap.</h3>
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<pre><code class="language-bash">brew tap swift-psychrometrics/formula
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</code></pre>
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<h3>Install the psychrometrics application</h3>
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<pre><code class="language-bash">brew install psychrometrics
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</code></pre>
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<p>That’s it!</p>
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<h2>Usage</h2>
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<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>
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<h3>Properties</h3>
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<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
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you will supply the dry bulb temperature and the relative humidity.</p>
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<p>Below, we calculate the psychrometric properties based on 75°F and 50% humidity.</p>
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<pre><code class="language-bash">psychrometrics --dry-bulb 75 --relative-humidity 50
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</code></pre>
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<p><img src="/articles/images/2023-09-18-properties.png" alt="properties-output" /></p>
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<h3>Dehumidifier Sizing</h3>
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<p>If you’ve read some of my recent articles on calculating the
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<a href="https://mhoush.com/posts/sizing-dehumidifier-by-latent-load/">dehumidifier size required based on the latent load</a>, the application also
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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>
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<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
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command to see what size dehumidifier is needed for <code>100%, 85%, and 70%</code> of the latent load.</p>
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<pre><code class="language-bash">psychrometrics dh size --coverage 100 85 70 --verbose 4334
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</code></pre>
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<p><img src="/articles/images/2023-09-18-dh-size.png" alt="dh-size" /></p>
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<h3>Pounds of Water Removed</h3>
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<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
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air stream given the grains of moisture removed.</p>
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<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>
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<pre><code class="language-bash">psychrometrics dh pounds-removed --delta 14 --cfm 797 --verbose
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</code></pre>
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<p><img src="/articles/images/2023-09-18-pounds-removed.png" alt="pounds-removed" /></p>
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<h3>Help</h3>
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<p>You can use <code>--help</code> option to show help and the list of commands provided.</p>
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<p><img src="/articles/images/2023-09-18-help.png" alt="help" /></p>
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<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>
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</article>
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<div class="border-t border-light mt-8 pt-8">
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<h2 class="text-4xl font-extrabold mb-8">
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Written by
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</h2>
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<div class="prose">
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<h3 class="!m-0">
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Michael Housh
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</h3>
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<p class="text-gray">
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HVAC business owner with over 27 years of experience. Writes articles about HVAC,
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Programming, Home-Performance, and Building Science
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</p>
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</div>
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</div>
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</div>
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<div class="mt-16">
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<h2 class="text-4xl font-extrabold mb-8">
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More articles
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</h2>
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<section>
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<h2 class="text-2xl font-bold mb-2">
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<a class="[&:hover]:border-b border-orange" href="/articles/2025/vapor-htmx-todo-app/">Vapor + HTMX</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">January 05, 2025</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/programming/">programming</a> and <a href="/articles/tag/software/">software</a>
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<p>
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<a href="/articles/2025/vapor-htmx-todo-app/"><div>
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<section>
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<h2 class="text-2xl font-bold mb-2">
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<a class="[&:hover]:border-b border-orange" href="/articles/2024/free-as-in-freedom/">Free As In Freedom</a>
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</h2>
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<div class="text-gray gray-links text-sm mb-4">
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<span class="border-r border-gray pr-2 mr-2">April 09, 2024</span><a href="/articles/tag/general/">general</a>, <a href="/articles/tag/open-source/">open-source</a> and <a href="/articles/tag/software/">software</a>
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</div>
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<p>
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<a href="/articles/2024/free-as-in-freedom/"><div>
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Salute to open-source software engineers
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</div></a>
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</p>
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</section>
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<p class="prose mt-8">
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<a href="/articles/">› See all articles</a>
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Copyright © Michael Housh 2023-2025.
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