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A cooling system that has a heat exchanger which is housed in one enclosure and is constituted of a plurality of heat exchange modes, and the heat exchanger includes a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode. A temperature detector performs

A cooling system that has a heat exchanger which is housed in one enclosure and is constituted of a plurality of heat exchange modes, and the heat exchanger includes a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode. A temperature detector performs switching to an optimal mode, to thereby cool the inside of the enclosure of a housing accommodating equipment including a heat-generating component.

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What is claimed is: 1. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element housed within a case, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means

What is claimed is: 1. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element housed within a case, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, and wherein the heat exchange means does not constitute part of the case. 2. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, wherein the plurality of heat exchange modes include a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode. 3. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, wherein a cooling system main body is attached to a side surface of the enclosure of the housing. 4. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, wherein the plurality of heat exchange modes include a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode, wherein a refrigerant forced circulation circuit of the refrigerant forced circulation mode and a refrigerant natural circulation circuit of the refrigerant natural circulation mode are constituted as a single refrigerant circuit. 5. The cooling system according to claim 2, wherein a refrigerant forced circulation circuit of the refrigerant forced circulation mode and a refrigerant natural circulation circuit of the refrigerant natural circulation mode are respectively constituted as different refrigerant circuits. 6. The cooling system according to claim 4, further comprising first temperature detection means for detecting a temperature of outside air, and second temperature detection means for detecting an internal temperature of the enclosure of the housing, wherein, on the basis of the temperatures detected by the first and second temperature detection means and a preset correction value, there is effected switching between the refrigerant forced circulation circuit and the refrigerant natural circulation circuit. 7. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, wherein the plurality of heat exchange modes include a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode, wherein an internal temperature of the enclosure of the housing is controlled by regulating a quantity of refrigerant circulating through a refrigerant natural circulation circuit during cooling operation in the refrigerant natural circulation mode. 8. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, wherein the plurality of heat exchange modes include a refrigerant forced circulation mode, a refrigerant natural circulation mode, and a ventilation mode, wherein control operation is performed for stopping an outdoor fan during cooling operation in the refrigerant natural circulation mode when the natural refrigerant circulation operation has become unnecessary as a result of a drop in an internal temperature of the enclosure of the housing. 9. The cooling system according to claim 6, further comprising control means for effecting/stopping ventilation operation on the basis of the temperatures detected by the first and second temperature detection means. 10. The cooling system according to claim 9, wherein the control means carries out/stops the ventilation operation in accordance with a signal input from the outside. 11. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, further comprising a fireproof damper having a detection function which opens and closes according to the circumstances of a setting environment. 12. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, further comprising a battery disposed in the enclosure of the cooling system main body, wherein cooling operation is performed by means of the battery in the event of a power failure. 13. A cooling system which cools the inside of an enclosure of a housing accommodating equipment including a heat-generating element, the system comprising heat exchange means constituted of a plurality of heat exchange modes, wherein the heat exchange means is housed in one enclosure, further comprising a hood provided on a portion of the cooling system main body which is exposed to outside air and makes a direction in which an exhaust heat air current is directed orthogonal to a direction of a suction air current.