Ship fresh water tank anti-freezing system

The invention discloses a ship fresh water tank anti-freezing system which comprises a heat exchanger arranged outside a fresh water tank. A first daily fresh water pump is arranged between the freshwater tank and the heat exchanger; a water outlet of the fresh water tank is connected with the first daily fresh water pump; the first daily fresh water pump is connected with a water inlet of the heat exchanger; a water outlet of the heat exchanger is connected with a water inlet of the fresh water tank. The ship fresh water tank anti-freezing system is easy to refit and low in implementation cost, reduces the construction cost and saves construction working hours; welding in the tank is omitted, and thus damage to a coating of the fresh water tank is avoided; power required for heating is reduced, and thus heat source consumption is reduced. 本发明公开了种船舶淡水舱防冻系统，其包括设于淡水舱外部的换热器；淡水舱和换热器之间设有第日用淡水泵；淡水舱的出水口与第日用淡水泵连接；第日用淡水泵与换热器的进水口连接；换热器的出水口与淡水舱的进水口连接。本发明易于改装、实施成本低，降低了建造成本，节省了建造工时；无舱内的焊接作业，避免了破坏淡水舱涂层；减小了加热所需要的功率，节省了消耗的热源