| 摘要 |
A central heating and cooling system comprising two independent circuits of the singe-tube type, a cold circuit which is coupled with its outgoing and return lines to a central cold-production machine and a hot circuit, also with outgoing and return lines coupled to a boiler or boilers, or alternatively to an exchanger or exchangers. These circuits comprise as many branch conduit lines as there are levels or stages in which the utilization points are located, each utilization point comprising a water-air temperature-exchange unit having a single air circuit. Each branch line has a pump upstream of its exchanger and a nonreturn valve downstream of its exchanger, flow through the branch line being from a first point on the associated main conduit to a second point on the associated main conduit, the first point being downstream of the second point with respect to flow of the heat exchange fluid through the main conduit. In this way the flow of the fluid through the branch line is prevented when the associated pump is not in operation.
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