103 lines
3.8 KiB
Markdown
103 lines
3.8 KiB
Markdown
---
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tags: HVAC, psychrometrics, software
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title: "Introducing Psychrometrics Cli"
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---
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# Introducing Psychrometrics CLI
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Today, I'm releasing a command line application that is built on top of my
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[swift-psychrometrics](https://github.com/swift-psychrometrics/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. 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 `docker` container on other platforms.
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## Why
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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 _"not good with computers"._ 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.
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## Installation
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For complete installation instructions, you can view the [github](https://github.com/swift-psychrometrics/psychrometrics-cli) repository.
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The following instructions are based on using macOS.
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### Open your terminal application.
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Personally, I use [iTerm2](https://iterm2.com/), however you can use the default `Terminal` app. Found at
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`/Applications/Utilities/Terminal.app`.
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## Install Homebrew
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We use [Homebrew](https://brew.sh) for package distribution of the pre-built application binaries. You can follow their instructions to
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install.
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### Tap our custom formula tap.
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```bash
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brew tap swift-psychrometrics/formula
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```
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### Install the psychrometrics application
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```bash
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brew install psychrometrics
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```
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That's it!
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## Usage
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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.
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### Properties
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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.
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Below, we calculate the psychrometric properties based on 75°F and 50% humidity.
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```bash
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psychrometrics --dry-bulb 75 --relative-humidity 50
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```
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### Dehumidifier Sizing
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If you've read some of my recent articles on calculating the
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[dehumidifier size required based on the latent load](https://mhoush.com/posts/sizing-dehumidifier-by-latent-load/), 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 `coverages` that you can supply.
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For example if we've done a load calculation and determined that we have a latent load of `4,334 BTU/h` then we could run the following
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command to see what size dehumidifier is needed for `100%, 85%, and 70%` of the latent load.
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```bash
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psychrometrics dh size --coverage 100 85 70 --verbose 4334
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```
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### Pounds of Water Removed
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I also recently wrote an article about [calculating the pounds of water removed](https://mhoush.com/posts/pounds-of-water-removed/) from an
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air stream given the grains of moisture removed.
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Below is an example of calculating the pounds of water removed per hour based on the example in the article (14 delta-grains)
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```bash
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psychrometrics dh pounds-removed --delta 14 --cfm 797 --verbose
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```
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### Help
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You can use `--help` option to show help and the list of commands provided.
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If you have any questions then feel free to email or message me. I hope some of you may find this application useful.
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