A practical route to lower-temperature operation The Albertslund experience suggests a step-by-step approach. Start by using network data to identify the buildings and areas that determine temperature requirements. Smaller shutdowns and fewer disturbances The value of zoning becomes very clear when work is carried out on the DH network. In a traditional setup, maintenance or pipework may require shutting down a large section. In Albertslund, the zone structure often makes it possible to isolate a smaller area while keeping the rest in operation. Local units can help maintain pressure and circulation for longer, even when work is taking place elsewhere. For consumers, that means fewer noticeable interruptions. In favourable summer conditions, a short intervention may go unnoticed. For the utility, the work can be planned with more flexibility and less operational risk. Finding faults faster The same principle improves fault-finding. If there is a leak or sudden pressure loss, operators can isolate smaller areas, rebuild pressure step by step, and observe how the network responds. The search area becomes smaller, fewer consumers are affected, and the utility can shift from a broad, network- wide reaction to a structured diagnosis. In this sense, zoning is both a network design principle and a troubleshooting tool. A more resilient network DH networks depend on pumps, control systems, and electricity. A local electrical disturbance or voltage drop can therefore affect more than the immediate area around a station. Albertslund's distribution structure has helped reduce that vulnerability. A disturbance at one location does not necessarily propagate in the same way, and local shunt or booster units may help sustain conditions in parts of the network when a larger station is affected.
support temperature, pressure, and circulation closer to end- users, so the entire main network does not have to operate at the highest requirement found anywhere in the system. But the experience from Albertslund also points to something less often discussed: low-temperature DH can change how a network is operated. In Albertslund, the move towards lower temperatures has gone hand in hand with a more zoned network. That has proven valuable in day-to-day operations. Operators can respond locally instead of changing conditions for every consumer. This provides more options during normal operation, planned work, and unexpected events. Why zones matter A DH network can be compared to a road system. If all traffic depends on a few main roads, a single problem can affect a wide area. If the system has smaller, connected sections, it becomes easier to isolate a problem, redirect flow, and keep the rest of the system running. The same logic applies hydraulically. Local shunt stations support temperature and pressure closer to consumers. As a result, the main network does not always have to operate at the same high level everywhere. If one area needs a little more heat or pressure, this can often be handled locally instead of adjusting the entire network. For operators, this creates a different kind of flexibility. The network is no longer treated only as one large system controlled from a few central points. It becomes a set of smaller zones that can be managed more precisely. This does not mean creating isolated ‘islands’ with no operational relationship. The value lies in understanding the interfaces between zones: where water enters, how pressure is maintained, which valves define the zone, and how an intervention in one area affects neighbouring areas. A clear hydraulic overview is therefore essential.
Figure 2. Step-by-step route infographic illustrating Albertslund’s approach to lowering district heating temperatures.
12 HOTCOOL no.5 2026
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