Do not turn off the water cooler at night.
If there is absolutely no power outage in the local area, the water cooler will not be turned off at night. At the same time, to save energy, the temperature of low temperature and room temperature water should be adjusted to 5 ~ 10 ℃ to ensure that the coolant is in a circulating state and the temperature is not lower than the freezing point.
Use antifreeze as a coolant.
Antifreeze must be used when the use environment often has power outages and does not have the conditions to drain the coolant every day. Antifreeze’s base liquid is generally composed of alcohol and water, which requires high boiling point and flash point, high specific heat and conductivity, low-temperature viscosity, not easy to foam, and does not corrode metal parts, rubber hoses, etc. When selecting or preparing antifreeze, its freezing point should be 5 ° C lower than the minimum temperature of the use environment.