# System for Indoor Comfort and Health Monitoring Tested in Office Building Environment
## 3 Methodology of the Proposed IoT System Development  
Providing a healthy and comfortable indoor environment is a basic need of people, whether this environment is a residential building, an office, a hospital or an educational institution. Parameters correlated with indoor environmental quality, temperature, humidity, carbon dioxide concentration and airborne particles are factors influencing comfort, health and productivity. Monitoring these parameters provides a series of advantages. For example, monitoring air temperature and humidity helps to identify inadequate thermal comfort conditions, while monitoring the levels of carbon dioxide, volatile organic compounds or formaldehyde may reduce their negative effects on health. These actions enable appropriate measures and therefore may lead to energy savings, with a positive impact on the environment. The data collected from the sensors can be used to adopt automatic or manual optimization measures regarding energy consumption with HVAC systems, lighting and appliances while ensuring an adequate indoor environment adapted to the user's needs. In order to develop a smart IoT monitoring system, the first step is to determine the main factors to be considered for assessing the complexity of specific requirements related to the building, user, environment and data privacy:  
* **Local needs assessment** in order to identify the specific indoor environmental quality and the main physical parameters to be monitored, such as temperature, humidity, air quality, the users' roles and their requirements; \begin{table}
\begin{tabular}{c c} \hline
**ID** & **Title** \\ \hline BS EN 12792:2004 & Unentilation for buildings. Symbols, terminology and graphical symbols \\ \hline BS EN 15316-1:2017 & Energy performance of buildings. Method for calculation of system energy requirements and system efficiencies. General and Energy performance expression, Module M3-1, M3-4, M3-9, M8-1, M8-4 \\ \hline ISO 50001:2019 & Energy management systems—Requirements with guidance for use \\ \hline EN ISO 7730:2005 & Ergonomics of the thermal environment—Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria \\ \hline EN ISO 7933:2005 & Ergonomics of the thermal environment—Analytical determination and interpretation of heat stress using calculation of the predicted heat strain \\ \hline EN ISO 8996:2022 & Ergonomics of the thermal environment—Determination of metabolic rate \\ \hline EN ISO 9920:2009 & Ergonomics of the thermal environment—Estimation of thermal insulation and water vapour resistance of a clothing ensemble \\ \hline EN ISO 11079:2008 & Ergonomics of the thermal environment—Determination and interpretation of cold stress when using required clothing insulation (IREQ) and local cooling effects \\ \hline EN ISO 11399:2003 & Ergonomics of the thermal environment—Principles and application of relevant International Standards \\ \hline EN ISO 13732-1:2009 & Ergonomics of the thermal environment—Methods for the assessment of human responses to contact with surfaces—Part 1: Hot surfaces) \\ \hline ANSI/ASHRAE Standard 55:2013 & Thermal environmental conditions for human occupancy \\ \hline ASHRAE 62.1: 2013 & Unentilation for acceptable Indoor Air Quality \\ \hline ASHRAE 62.2: 2013 & Unentilation and acceptable indoor air quality in low-rise residential buildings \\ \hline WHO (World Health Organization)-EURO: 2000 & Air quality guidelines for Europe \\ \hline WHO (World Health Organization): 1990 & Indoor environment: health aspects of air quality, thermal environment, light and noise \\ \hline \end{tabular}
\end{table} 
Table 5: Standards and directives regarding internal environmental quality [22].