(1)并联管路的水力特征 环路a-S1b-热源-a 1=8h(P=0 S2 ●环路a-S2b-热源-a 2=8(h4+h2)(Pn-P2) PGL+gh,(pn-pp)（1）并联管路的水力特征 ⚫ 环路a-S1 -b-热源-a ( ) PG1 = gh1 h −  g ⚫ 环路a-S2 -b-热源-a ( ) ( )( ) 1 2 2 1 2 G h g G h g P gh P g h h     = + − = + −