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In a simplified definition, the solar transverse angle varies throughout the day depending on the solar time, whereas the solar longitudinal angle is a function of the latitude, declination and collector slope.
8.2.3.2 Effect of varying collector slope
Table 8.7 shows the annual energy savings for various collector slopes using Sydney weather data.
Collector slope (degree) Annual energy saving (%) 10 61.7 20 65.6 30 67.1 40 66.0
Figure 8.12: Effect of the collector area on the gas required by the system in Sydney (collector slope = 20o)
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