This is a very specific but interesting case. The case is well documented with a good description of all steps. However some changes have to be done for acceptance.
- The abstract must be a sump up of the most relevant information of the paper. Information such as the type of sensor or the acknowledgement should not be included.
- Define all acronymous (i.e. STESS)
- In table 1, you specify different enthalpies for fusion and crystallization. Can you please explain this big difference?
- Meteo data are missing in section 3.1
- In addition, the melting temperature of your PCM is necessary to reproduce your work.
- In section 3.2, “A square profile was selected for the coils to maximize the effect of natural convection”. Can you please justify?
- You control the maximum temperature by passing cold water through the solar collector. Have you calculated how much water is required for this? And what do you do with this water?

The quality and impact of this work is limited and it can only barely reach approval standard.
In addition, some of the text may have been created by an IA.

The article is well structured and written. The manuscript presents a good literature review to show the gap research.

The article is interesting and is aligned with the objectives of the conference.

• Beatriz del Río

• Best Poster Award.

Some factors, such as the growing demand for thermal energy, the need for energy autarky by countries, and climate change issues, boost the development of renewable energy systems. According to the Sustainable Development Goals (SDGs), solar thermal energy is considered one of the most promising renewable energy sources, with a particularly challenging scenario for its implementation being moorland areas. This paper presents the results of the design and performance of a solar thermal storage system (STSs) located in a Colombian moorland with an altitude of 3,200 meters above sea level (m.a.s.l.) to supply hot water and space heating for a bedroom. This experimental setup implements an indigenous phase change material (PCM) of renewable origin and a robust measurement and control system, including 39 PT-100 type temperature sensors and a control system based on the microcontroller board Arduino MEGA. This configuration also allows for the implementation of a remote monitoring system. The constructed STSs employs 140 collector tubes and 550 kg of PCM, running at a maximum temperature of 75 °C. The equipment allows it to be kept at a temperature of 17 °C at night inside the bedroom and supply the standard hot water demand. The research outcomes so far show that the technology developed can fulfill the energy needs of a rural house in a moorland zone, and it becomes a starting point for designing of systems aimed at other applications or larger scales. These activities were funded by The Royal Society through the ICA\R1\19120 LA-SOLAR ENHANCED project.