Safety and Efficiency of Daytime Operation of Solar Hot Water System
During the operation of evacuated tubular collectors in cold climates, pure propylene glycol or its mixture with water is used as the coolant. The upper permissible heating temperature of pure propylene glycol is 187 °C, and the freezing point is –60 °C. However, the heated mixture, which does not freeze at –40 °C,...
N. Tsvetkov, Y. Krivoshein, A. Tolstykh et al.
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