diff options
Diffstat (limited to 'proposal/proposal.tex')
| -rw-r--r-- | proposal/proposal.tex | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/proposal/proposal.tex b/proposal/proposal.tex new file mode 100644 index 0000000..8605f8b --- /dev/null +++ b/proposal/proposal.tex @@ -0,0 +1,85 @@ +\documentclass[11pt]{article} +\usepackage[backend=biber]{biblatex} +\usepackage{hyperref} +\usepackage{parskip} +\usepackage{graphicx} +\usepackage{tabularx} + +\addbibresource{sources.bib} + +\title{Smart Campus Humidifer System Proposal +\\ SOEN 422} +\author{Sam Anthony 40271987} +\date{\today\\Revision 1} + +\begin{document} + +\maketitle + +\section{Problem} + +Humidity is the amount of water vapor in a given amount of air. +Relative humidity (RH) is the ratio of humidity to the maximum possible humidity before condensation occurs. +Health Canada recommends a RH of 35--50\%. +However, during the winter when indoor heating is used, RH can fall below 30\%. +This can cause skin and eye irritation, and can lead to respiratory infections~\cite{healthcanada}. +The RH of campus buildings should be regulated, especially during the winter. + +A solution should meet the following criteria: +\begin{enumerate} + \item regulate indoor humidity, + \item integrate with existing on-campus HVAC systems, + \item be economical to install and maintain, + \item be energy efficient, and + \item be easily configurable. +\end{enumerate} + +\section{Proposed Solution} + +The proposed solution is a humidifier with a closed-loop control system. +It will be a \emph{fog type} humidifier with a high-pressure pump and atomizing nozzle that injects water droplets into the air stream. +This will minimize cost and energy compared to a \emph{steam type} humidifier because no heating element is required. +According to Armstrong, ``pressure fog is a system that is perfect for applications requiring high humidification output with minimal energy consumption" \cite{armstrong}. + +The water nozzle can easily be installed in the existing HVAC ductwork. + +Inhabitants of the building will be able to adjust the desired humidity level from their smart phones. + +\section{Initial Design} + +A microcontroller equiped with a humidity sensor and a WiFi and Bluetooth module will be installed in each room of the building. +The humidity of each room will be sampled periodically and sent to a remote server via the WiFi network. +Users will connect from their phone and set the target humidity via bluetooth. +The target humidity will also be sent to the server over WiFi. + +The server will store the target humidity and will maintain a log of humidity measurements for each room. +With this data it can calculate a running average humidity for the building. + +Another microcontroller, also WiFi-capable, will be installed in the central HVAC room of the building. +It will connect to the server via WiFi and retreive the target humidity and current average humidity of the building. +A PID algorithm will be used to determine the correct duty cycle of the humidifier in order to regulate the humidity to the target level. +To control the humidifier, the microcontroller will use PWM to actuate a solenoid valve between the water pump and the injection nozzle. + +The HVAC room microcontroller will post the current duty cycle to the server for monitoring. +The server will provide a graphical interface that displays historical humidity data for each room and for the entire building, as well as the current duty cycle of the humidifier and the target humidity. + +\fbox{\includegraphics[width=\textwidth]{"diagram.png"}} + +\section{Hardware} + +\begin{tabularx}{\textwidth}{r X X} + \hline + Quantity & Device & Notes \\ + \hline + 1/room & DHT11 humidity sensor \\ + 1/room + 1 & ESP32 & one per room, and one for the HVAC room \\ + 1 & High-pressure water pump \\ + 1 & Solenoid valve \\ + 1 & Atomizing nozzle \\ + - & Water lines \\ + \hline +\end{tabularx} + +\printbibliography + +\end{document}
\ No newline at end of file |