HEATING/COOLING SYSTEM

PROBLEM TO BE SOLVED: To provide a heating/cooling system having a connecting pipe branch header, capable of restraining an increase in an installation space of a pipe, capable of reducing a pressure loss of a cold heat medium, and capable of improving workability. SOLUTION: This heating/cooling system 100 has the connecting pipe branch headers 20, 20, etc. connected to a forward pipe 12 and a return pipe 13 connected between a cold heat medium supply source 11 and heat-using apparatuses 15, 16, 17, 18, etc. In the heating/cooling system 100, the connecting pipe branch headers 20, 20, etc. have flow passages 21, 21a, 22 and 22a in the different flow direction on its inside, and one flow passage 22 crosses in a plan view the other flow passage 21a, and the inside of a cylindrical body 25 having an outer diameter smaller than an inner diameter of the one flow passage 22 penetrating in the crossing direction into the one flow passage 22, is formed as the other flow passage 21a in the crossing part 26. COPYRIGHT: (C)2006,JPO&NCIPI