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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.

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  • $\begingroup$ A heat exchanger? So allows heat but allows different pressures for example... $\endgroup$ – Solar Mike Aug 19 '19 at 13:51
  • $\begingroup$ Duplicate: engineering.stackexchange.com/q/29712/10902 $\endgroup$ – Solar Mike Aug 19 '19 at 13:52
  • $\begingroup$ accidental double post, deleted the other one. $\endgroup$ – mart Aug 19 '19 at 14:00
  • $\begingroup$ A heat exchanger is the second option, because it would 'cost' me 5-10 K. But it would help with the hydraulic headaches ... $\endgroup$ – mart Aug 19 '19 at 14:03
  • $\begingroup$ I sized a heat exchanger for two sources (one a solar heated water tank, the other a 30kW boiler) and those were at each end of the distribution system with 6 or so loads demanding in between... Was designed so both could input as necessary with solar having priority: cheaper... That exchanger was about 2k iirc $\endgroup$ – Solar Mike Aug 19 '19 at 14:10

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