according to fig1 a cold transfer installation according to the invention allows the cooling of a plurality of vats 1a to 1h , disposed in the same location , and containing in all or in some of them a load of grapes or a grape harvest in fermentation . the vats 1c and 1g have been shown in a detailed way in fig1 . an intermediate circuit 2 allows the circulation of a cold - bearing fluid , namely diphasic water in melting equilibrium , these two phases being mixed with each other homogeneously , for example in the form of a paste or &# 34 ; sorbet &# 34 ;, in which ice floats in a natural manner in the water . the circuit is in the form of a practically closed loop , whose outlet 3b is connected to the inlet of a pump 4 , and whose inlet 3a is connected to the delivery outlet of the same circulation pump 4 . conventionally , the intermediate circuit 2 is fitted with an expansion chamber 5 and a filling valve 6 provided at its output with an anti - scale device and a filter . this circuit 2 is practically closed to itself in the sense in that , apart from the tappings necessary for the withdrawal and supply of cold - bearing fluid , and of those corresponding to the inlet and outlet of each tapped circuit , there are no other inlets or outlets of the cold - bearing fluid , which rotates around the loop 2 , in the homogeneous diphasic state , practically at all points of the loop . in the loop 2 , the cold - bearing fluid is freely carried , in the sense that there are no obstacles or devices , other than a pump 4 and the necessary control valves , through which the current of the said fluid passes and acting against the circulation or flux of the latter . such devices could for example be a filter through which the entire flow of the cold - bearing fluid passes ; according to the invention , such devices are excluded from the path or passage of the cold - bearing fluid in the loop . advantageously , the loop 2 can be produced by the assembly or fitting of pipes made from plastic material , for example pvc , connected with appropriate seals , for example so - called &# 34 ; tulip &# 34 ; elastomer seals . in the intermediate loop 2 there is connected a thermally insulated tank 50 for the generation and storage of diphasic water in melting equilibrium . this tank or silo is connected to the loop 2 by means of an input duct 51 fitted with an endless screw 52 for feeding paste or &# 34 ; sorbet &# 34 ;, on the intake side of the pump 4 ; this recipient is connected with the loop 2 , by an output duct 53 , with a tapping which is uniquely in the liquid phase of the cold - bearing fluid , upstream of the input duct 51 . internal means ( not shown ) for putting the water and the ice into state of turbulence are associated with the recipient 50 . a tapping 54 takes water in liquid phase from the base of the recipient 50 , and returns a mixture of ice and water to the top of the recipient 50 . with this tapping there is associated a primary heat exchanger 33 , with a polished surface , in which a refrigerating fluid 21 flows this fluid being part of a refrigeration unit . as shown for the vats 1c and 1g , each tapped circuit , for example 7c , associated with a vat , for example 1c , essentially comprises a secondary heat exchanger 8 , disposed in the vat , either within the load in the process of fermentation , or at its surface . the inlet 9 of the exchanger 8 is connected to the intermediate loop 2 via a tapping controlled by a valve 10 and a pump 11 . the outlet 13 of the same exchanger is connected to the intermediate loop 2 , in the form a return tapping controlled by a valve 12 . as shown in fig2 the inlet 9 of each tapped circuit 7c is provided with a device , for example a grid 14 , ensuring a tapping which is uniquely in the liquid phase of the cold - bearing fluid 15 , shown in fig2 and 3 in the form of a mixture of water and ice . according to fig3 the downstream end 13a of each outlet duct 13 of a tapped circuit 7 opens into the upper section of the intermediate circulation loop 2 , in such a way that the return of relatively warm water is carried out directly into the ice of the diphasic mixture . furthermore , as shown in vats 1c and 1g , a control system , for example 20c , is associated with each vat , and comprises a temperature detector ( not shown ) disposed on the heat exchanger 8 , for example at its output , a device for adjusting the flow rate circulating in the tapped circuit , for example 7c , and an automatic means for the control of the same flow rate as a function of the temperature detected on the exchanger 8 . the control system 20 can act either on the pump 11 , or on one or other of the control valves 10 and 12 . by means of the previously described installation , it is possible to transfer cold into the different vats 1a to 1h to be cooled according to the following method : in the circuit 2 there is established an intermediate circulation loop of the cold - bearing fluid , in diphasic form as previously mentioned , this fluid is cooled , and therefore permanently maintained in the diphasic form , outside of the loop 2 , with production of ice in the silo 50 , by heat exchange with the refrigerating fluid 21 circulating in the primary exchanger 33 at the level of each vat 1 , in the corresponding tapped circuit 7 , a current in liquid phase is tapped from the cold - bearing fluid , the load in the vat 1 is cooled by heat exchange , in the secondary exchanger 8 , with the tapped current of the cold - bearing fluid ; this exchange of heat causes the reheating of the liquid phase of the tapped current ; and finally the reheated current is returned into the intermediate loop 2 in the latter , the returned tapped current is immediately cooled again to freezing temperature , by the melting of the solid phase present at that place in the intermediate loop . as shown in fig2 the current flowing in each tapping 7 associated with each vat is taken from the liquid phase of the cold - bearing fluid 15 , that is to say from the water - ice , sorbet - type mixture . furthermore , by means of the control system 20 associated with each vat 1 , the flow rate circulating in the tapping 7 is controlled , for each enclosure or vat 1 , as a function of one or more measured or detected parameters . the first measured or detected parameter is the temperature of the tapping current 7 reheated or in the process of reheating in the exchanger 8 . a second parameter can be the temperature in the vat 1 . these two parameters allow the detection at all times of the quantity of heat released in the vat , during the fermentation phase . by analysis of the variation of any one of these temperatures it is thus possible to detect the real requirement of cold in the vat , and to anticipate or modulate the amount of refrigeration applied to the latter . according to the invention , an intermediate loop 2 for the circulation of the cold - bearing fluid can be used in any type of configuration . according to fig1 this configuration is situated on one and the same level , such that the cold - bearing fluid essentially circulates in the same horizontal plane . but according to fig4 and 5 , the intermediate circulation loop 2 can be disposed in two levels , one being the upper level referenced 60 and the other being the lower level referenced 61 . in this case , the connection arrangements between these two levels shown in fig4 and 5 allow : the establishment in the drop towards the lower level 61 of a current of linear speed which is sufficiently large to carry with it the solid phase separated from the cold - bearing fluid , for example ice particles and the retention of the solid phase particles , at the level at which they are , in the case of stopping the installation , in particular in the case of stopping the circulation pump 4 . for an intermediate circulation of the cold - bearing fluid , with a low solid phase content , for example of the order of 10 to 15 % of the volume in circulation , according to the fig4 the drop towards the lower level 61 is initiated , at the top , by an upward mounted syphon 62 , and is completed , at the bottom , by a syphon 63 , normally downward mounted . the cross - section of the inner vertical duct 64 dropping between the two syphons 62 and 63 is smaller than the nominal cross - section of the intermediate circulation loop 2 , in order to increase the linear speed of descent of the cold - bearing fluid . due to this arrangement , the solid phase accumulating little by little at the top of the syphon 62 , becomes pushed into the vertical duct or column , by being carried along with the liquid phase of the cold - bearing fluid , acting as a flush . this same solid phase , in dispersed form , then passes through the second syphon 63 and is then found again at the lower level 61 . the arrangement according to fig4 therefore proves effective for avoiding any obstructing blockages of the solid phase of the cold - bearing fluid . the arrangement according to fig5 is used when the cold - bearing fluid in the intermediate loop 2 has a relatively high ice content , for example exceeding 10 to 15 % of the total volume of the latter . according to this arrangement , the upper syphon 62 is eliminated , but the lower syphon 63 is retained . the drop to the lower level 61 is therefore initiated by a normal right - angled bend of the loop 2 . downstream of the syphon 63 , a pump 65 takes a proportion of the cold - bearing fluid , in liquid form only , raises the flow thus taken to the upper level 60 , and injects the raised flow into an orifice 66 provided in the bend 67 , in the axis of the vertical drop duct 64 , the latter having the nominal diameter of the circulation loop 2 . in this way , an acceleration of the current of the cold - bearing fluid descending in the duct 64 is created . according to fig5 in the case of stopping the installation , all of the solid phase of the cold - bearing fluid is again at the lower level 61 , and remains there , because of the syphon 63 . in this way , the creation of any major obstruction or blockage is avoided at the upper level 60 of the loop 2 , which would prevent the restarting of the installation . according to fig6 the outlet tapping 13 of the tapped circuit is disposed upstream of the inlet tapping 9 of the same circuit , in the direction of circulation of the coldbearing fluid in the loop 2 . a non - return valve 70 is disposed on the outlet 13 between the exchanger 8 and the return tapping . this arrangement avoids any circulation of the cold - bearing fluid in the case of stopping of the pump 11 . the present invention can be applied outside of the vinification field , for example it can be used in air conditioning or for refrigerated warehouses .