Quanto à transmitância em coletores solares planos com isolamento térmico de vidro em várias camadas, considerando a radiação solar constante, é INCORRETO afirmar que
- A) a transmissão da radiação incidente até o elemento de absorção depende do ângulo de incidência e das perdas por reflexão em cada camada de vidro.
- B) quanto maior o número de camadas, menor será a energia transmitida para o elemento de absorção.
- C) quanto menor o ângulo de incidência da radiação solar, maior será a transmitância para o elemento de absorção.
- D) a transmitância independe do ângulo de incidência da radiação solar sobre a camada de vidro mais externa.
Resposta:
The correct answer is D) The transmission is independent of the angle of incidence of solar radiation on the outermost glass layer.
This is because the transmission of solar radiation through a flat-plate solar collector with thermal insulation and multiple layers of glass does not depend on the angle of incidence of the radiation. The angle of incidence affects the amount of radiation that is reflected by the glass surface, not the transmission through the glass.
In a flat-plate solar collector, the solar radiation that is not reflected by the glass surface is transmitted through the glass and absorbed by the absorber element. The transmission of radiation through the glass is determined by the properties of the glass, such as its thickness, refractive index, and absorption coefficient.
The angle of incidence of the solar radiation only affects the amount of radiation that is reflected by the glass surface, not the transmission through the glass. Therefore, the transmission of solar radiation is independent of the angle of incidence of the radiation on the outermost glass layer.
This is why option D) is the correct answer, as it states that the transmission of solar radiation is independent of the angle of incidence of the radiation on the outermost glass layer.
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