PURPOSE: To construct a freezing system without making a non-freezing solution tank with expensive material, by attaching at least one cooling apparatus for non-freezing solution detachably to a non-freezing solution tank and circulating a non-freezing solution between the evaporator of a refrigerator and the non- freezing solution tank using the cooling apparatus.

CONSTITUTION: A freezing system is constructed by separably attaching non- freezing solution cooling apparatuses 14A, 14B to a non-freezing solution tank 12 containing non-freezing solution 10 and circulating the non-freezing solution 10 between the evaporator of a refrigerator 16 and the non-freezing solution tank 12 thereby cooling the non-freezing solution with the evaporator. The cost of the non-freezing solution tank can be reduced by using a disposable non-freezing solution tank made of an inexpensive material.