We need to connect two distinct heating networks on a wastewater treatment plant into one. So far I've only seen heating networks with one central heat source or one central manifold that all heat sources feed into, but this time we have distributed sources.
Here's the state the system is now in: network 1: Natural gas boiler, several smallish consumers (two adjactant buildings) network 2: oil boiler, sewage gas CHP, several smallish and one big consumer (sveral buildings, spread aout about 100m apart)
Target state: both networks (about 100m apart) are connected, Manifold 1: one additional gas CHP, one additional largish consumer Manifold 2: no change
Manifold 1 should supply power to manifold 2 when needed, never the other way round.
My idea is to have connect both hot and cold sides and have pumps (hot side manifold 1 -> hot side manifold 2, cold side manifold 2 -> cold side manifold 1). The "hot" pump will be controlled for delta T between both manifolds, the cold pump should ensure hydraulic balance but I dont know a good control scheme for this.