Final answer:
Using heavy materials in a solar box increases thermal mass, allowing for the storage and gradual release of thermal energy. This results in natural temperature regulation without much active heating and is economically valuable, especially in energy-poor regions.
Step-by-step explanation:
The benefit of using heavy materials in a solar box is primarily linked to their ability to store thermal energy. When used within the construction of buildings, as stated in Figure 13.21, a large, dark thermal mass—like stone or brick—can absorb a significant amount of energy during sunny periods. Later, this captured heat can be slowly released during cooler hours, like in the evening, providing a natural and efficient form of temperature regulation. This use of Passive House designs maximizes solar energy capture, thus reducing the need for active heating systems.
Similarly, in the context of Figure 14.29, the use of durable materials in a solar cooker enables the retention of solar energy through the greenhouse effect and reflective materials. This energy-efficient design is particularly economically valuable in energy-poor regions. As per Mária Telkes's early models, these cookers demonstrate how harnessing solar power can be both a sustainable and cost-effective solution.