| 摘要 |
The collector has a volume (Vk) defined internally by an internal wall (4) and exteriorly by a heating envelope (3) placed within an outer transparent envelope (1). The two walls (1,3) can be concentric and coaxial and may be diametrically or axially extended. The volume (Vk) is equal to the volume formed by the exterior wall less the volume (V4) defined by the internal wall. The volume of the mass of hot fluid is reduced by the empty volume defined by the wall so that the quantity of the fluid contained is proportional to the absorbent surface.
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