Final answer:
The volume lost in a Solera system is termed the "angel's share," but it doesn't apply to passive solar systems. Instead, to find the amount of energy stored in the water of a passive solar system, one would calculate the thermal energy using the specific heat capacity formula.
Step-by-step explanation:
The term for the volume lost in a Solera system is the "angel's share." This is a phenomenon primarily associated with the aging process in wine and spirits where some of the volume is lost to evaporation. However, when considering a passive solar system, this term doesn't quite apply. Rather, if we need to find the amount of energy stored in the water wall of a passive solar system, we would use the given volume and density of water along with the initial and final temperatures to calculate it. This involves using the specific heat capacity of water and applying the formula for thermal energy, which is Q = mcΔT (where Q is the energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature).
For instance, if we know the volume of water, we can calculate the mass since the density of water is approximately 1 kg/L. Once we have the mass, we can use the specific heat capacity of water (about 4.18 J/g°C for liquid water) and the temperature change to find the total energy stored during the day as the water wall absorbs sunlight. At night, this stored energy is gradually released to warm the air inside the house, which is what makes the passive solar system so effective.
While the concept of the "angel's share" is interesting, it's more appropriate in discussions of barrel aging in distillation processes rather than thermal energy storage calculations in passive solar design.