the aqueous solution has a temperature of 20 u00b0 c although the clathrate supply pipeline is fixed and the flow rate is constant it is still possible to vary a heat supplying amount within a range of 1 2 in general equipment for manufacturing consuming and transporting the cold latent heat may be set to their maximum efficient points under a certain flow rate thereby obtaining an optimum running condition for this reason by virtue of the concentration adjustment in accordance with an actually needed amount of energy it is possible to run the system under the optimum condition however in fig1 reference numeral 7 is used to represent another pipeline for supplying the clathrate and a further pipeline for supplying the melted aqueous solution then with reference to fig2 a description is provided for an example where the cooling apparatus capable of manufacturing the clathrate is a refrigerating machine of a steam absorbing type and an air dehumidifying system of an absorbing type is provided together with a cold latent heat transporting system here as to pipelines for supplying the liquid clathrate and pipelines for supplying the melted aqueous solution further as to storage containers for storing the clathrate and aqueous solution some elements identical with those in fig1 are represented by the same reference numerals and similar explanations thereof will be omitted here a cooling apparatus 3 a for manufacturing the clathrate is a refrigerating machine of a steam absorbing.