2.1. Methods
As the objective is to introduce a data-driven system as a new mechanism to improve decision-making for solar roof panels, the Plan–Do–Study–Act (PDSA) methodology was adopted to establish the DDM to serve the purpose of this research project. PDSA has been widely used within healthcare and other industries to improve processes and achieve desired outcomes (Fig. 3) [19, 20]. The PDSA cycle is a four-step iterative process that involves planning, executing, evaluating, and refining a change [20]. In the initial Plan phase, the problem is identified, and a plan is developed to address it. In the Do phase, the plan is implemented, and data is collected. The Study phase involves analyzing the data collected in the previous step, to determine if the plan was successful in addressing the identified problem. Finally, in the Act phase, the findings from the Study phase are used to refine and improve the plan, which is then implemented again in the next PDSA cycle.
Adopting PDSA as a methodology for establishing a DDDSS for solar panel roofs can be effective because it allows for continuous improvement of the system over time. The Plan phase can involve identifying areas where data can be collected, and developing a plan for collecting and analyzing that data. In the Do phase, the plan can be implemented, and data can be collected from GtoC. In the Study phase, the data can be analyzed to identify patterns or trends, and to determine if the system is meeting its intended goals. Finally, in the Act phase, the findings can be used to refine the system and improve its performance in subsequent PDSA cycles.
As can be seen in Fig. 4, the process of creating a DDM involves several key stages [21], as attested by previous research [5]. It begins by defining the mission or problem at hand and then proceeds to identify the relevant data sources. Once the data is collected, it undergoes a thorough cleaning and organizing process, to ensure its quality and suitability for analysis [22]. The next stage involves performing statistical analyses on the cleaned and organized data, utilizing appropriate methods and techniques [23, 24]. This step aims to extract meaningful insights, identify patterns, and derive conclusions based on the information derived from the data and statistical analysis [24].
2.2. Proposed DDM
Countries like Qatar are prone to sandstorms, which can lead to the accumulation of sand on solar panels and degrade the amount of energy generated [25]. The proposed DDM, as depicted in Fig. 5, aims to contribute to the monitoring of changes in the performance of solar panel systems. By comparing the amount of GtoC under ideal working conditions with the amount of GtoC after dust accumulation, statistical analysis can determine if the impact of dust significantly degrades the amount of energy generated. This analysis can be conducted for a single home, a specific region with multiple homes, homes distributed across a city, or the total number of homes in a country. Based on these findings, informed decisions can be made to address the impact of dust accumulation on solar panel performance.
2.3. Identifying Mission/ Problem
Solar panels may experience degradation in the amount of generated energy due to aging, lack of maintenance, and other reasons [26]. It is important to monitor the extent of this degradation in order to determine the necessary course of action. With multiple solar panels installed on residential roofs, a reactive approach is often taken, waiting until the system completely stops or experiences a significant drop in energy generation before conducting checks. However, a proactive approach is more advantageous for sustaining clean energy generation [27]. Therefore, the objective of this study is to establish a mechanism that can effectively identify degradation in the amount of energy generated by home solar panels, providing stakeholders with valuable information to make informed decisions.
2.4. Identifying Data Sources
Identifying the right data sources is a critical factor in enabling the proposed approach to function as intended. In the related research conducted, it was found that the GtoC indicator can serve as a simple and useful data source [5]. This indicator can be extracted from a single home, a specific region, or even the entire country, depending on the analyses needs to be made. By utilizing this data, valuable insights into energy generation and consumption patterns, which can inform decision-making processes by different stakeholders and support the development of sustainable energy strategies. As previously established through an analytical study, GtoC data provides a wealth of information that can be used to supply DDMs with the necessary data to make informed decisions. GtoC data can be generated based on the following equations derived from previous research [16].
Estimated Daily Solar Panels Energy Generation Formula
$${G=\frac{\left({p}_{s}1000 {p}_{n}{ p}_{e }{s}_{PD }\right)}{1000} }_{ }$$
where \(G\) is the total generated electrical energy from solar panels (kWh), \({p}_{s}\) is the solar panel area (m2), \({p}_{n}\) is the number of solar panels, \({p}_{e}\) is solar efficiency, and \({s}_{PD}\) is sun hours per day.
Generated to Consumed Electrical Energy Ratio (GtoC) Formula
$${G}_{to}C=\left(\frac{G}{C}\right)\times 100\%$$
where \(G\)is the total generated electrical energy from solar panels in KWh, and \(C\)is the consumed electrical energy by the house in KWh.
Average \({G}_{to}C\) for Number of Homes in City or District Formula
$${\left({G}_{to}C \right)}_{A }=\frac{\left(\sum _{i=1}^{n}{\left({G}_{to}C \right)}_{1 }+{\left({G}_{to}C \right)}_{2}+\dots +{\left({G}_{to}C \right)}_{n}\right)}{n}$$
where n is the total number of houses in the city or district.
National \({G}_{to}C\) Formula
$${\left({G}_{to}C \right)}_{N }=\frac{\left(\sum _{i=1}^{n}{\left({G}_{to}C \right)}_{A1 }+{\left({G}_{to}C \right)}_{A2}+\dots +{\left({G}_{to}C \right)}_{An}\right)}{n}$$
where n is the total number of cities or districts in country.
2.5. Cleaning and Organizing Data
Cleaning and organizing the data in DDMs is crucial to ensure accurate and reliable results. It is important to note that only 20% of the data will be used for analysis in order to make informed decisions; additionally, organizing the flow of the data is essential to ensure a meaningful approach that captures relevant information [28]. In this research, the implementation of the tree-topology approach (as shown in Fig. 6) is considered the most appropriate, as it enables a better flow and collection of data for subsequent statistical analysis. The tree-topology approach offers several advantages, including improved data handling, efficient data processing, and enhanced data integrity [28]. By utilizing this approach, the collected data can be managed and analyzed, effectively, leading to more accurate and reliable research outcomes.
Figure 6 illustrates the tree topology, which facilitates the collection of GtoC data across three tiers: home, city, and national levels. This hierarchical structure allows for statistical analysis to be conducted at different levels, enabling informed decision-making based on the data obtained from each tier. In order to establish a DDM to support decision-making regarding the impact of dust accumulation on solar panel performance and energy generation, an assumption was made based on a study of 100 homes. The GtoC data was calculated using information from a previous study, representing the ideal operational scenario. Subsequently, the data was degraded at different levels, including − 5%, -10%, and − 20%, as shown in the Table 1. This degraded data was then utilized to feed the model and perform the subsequent stage of statistical analysis, transforming the data into meaningful information that can be understood by various stakeholders.
Table 1
Month | Ideal situation | Degradation by [-5%] | Degradation by [-10%] | Degradation by [-15%] | Degradation by [-20%] |
Jan | 39.8208 | 37.82976 | 35.83872 | 33.84768 | 31.85664 |
Feb | 42.5856 | 40.45632 | 38.32704 | 36.19776 | 34.06848 |
Mar | 44.2368 | 42.02496 | 39.81312 | 37.60128 | 35.38944 |
Apr | 47.6928 | 45.30816 | 42.92352 | 40.53888 | 38.15424 |
May | 50.5728 | 48.04416 | 45.51552 | 42.98688 | 40.45824 |
Jun | 51.2256 | 48.66432 | 46.10304 | 43.54176 | 40.98048 |
Jul | 50.9568 | 48.40896 | 45.86112 | 43.31328 | 40.76544 |
Aug | 48.2304 | 45.81888 | 43.40736 | 40.99584 | 38.58432 |
Sep | 46.464 | 44.1408 | 41.8176 | 39.4944 | 37.1712 |
Oct | 43.2 | 41.04 | 38.88 | 36.72 | 34.56 |
Nov | 39.936 | 37.9392 | 35.9424 | 33.9456 | 31.9488 |
Dec | 39.0528 | 37.10016 | 35.14752 | 33.19488 | 31.24224 |
Av. GtoC | 45.3312 | 43.06464 | 40.79808 | 38.53152 | 36.26496 |