The highest temperature in summer was 50 °C in June and the lowest was 30°C in September. While,
the lowest temperature of the digester in January which was 10°C (a snowy day), and the highest
temperature was 45°C (in a sunny day). The annual average temperature of digester in the summer
was 40°C, while in winter was 33°C.The daily average of biogas production in summer reached 110
L compared to 100 L during winter. The increase in biogas production rate was attributed to an
increase in the digester temperature. The largest daily volume (235 L) of biogas was measured at
45°C during sunny days in January, while the lowest biogas volume (4 L) was at 10°C in snowy day
in January. In this study, the winter months (84 sunny days), the average temperature of the digester
days was 39°C with total daily average of the biogas production 133 L. During the sunny days, heated
water was circulated in the digester, while during rainy days (67 days) the daily average of biogas
production was 57 L with an average temperature of 26°C. The impact of the solar system on biogas
production rate was elucidated by comparing the averages of temperature and biogas produced in
sunny days with those in the rainy and snowy days during winter season
The highest temperature in summer was 50 °C in June and the lowest was 30°C in September. While,the lowest temperature of the digester in January which was 10°C (a snowy day), and the highesttemperature was 45°C (in a sunny day). The annual average temperature of digester in the summerwas 40°C, while in winter was 33°C.The daily average of biogas production in summer reached 110L compared to 100 L during winter. The increase in biogas production rate was attributed to anincrease in the digester temperature. The largest daily volume (235 L) of biogas was measured at45°C during sunny days in January, while the lowest biogas volume (4 L) was at 10°C in snowy dayin January. In this study, the winter months (84 sunny days), the average temperature of the digesterdays was 39°C with total daily average of the biogas production 133 L. During the sunny days, heatedwater was circulated in the digester, while during rainy days (67 days) the daily average of biogasproduction was 57 L with an average temperature of 26°C. The impact of the solar system on biogasproduction rate was elucidated by comparing the averages of temperature and biogas produced insunny days with those in the rainy and snowy days during winter season
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