District Heating Schemes - Demarcation - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

3.10 District Heating Schemes - Demarcation

• Large community heating or district heating systems can be extensive networks covering large demographic
areas. They can be added to later and also linked to other schemes to form an even larger network. As such it is
important that the Mechanical and Electrical Designer takes this into consideration when planning and designing a
suitable system.
• A key consideration for the designer is that of demarcation. It is important that demarcation lines are as clear as
possible to ensure that the responsibility for the maintenance and the up keep of the complete system is easily
understood by all stakeholders. Demarcation is important for small community heating schemes as well as larger
networks.
• Utilising centralised plantrooms in large buildings and separate substations for smaller buildings are
recommended. The use of plate heat exchangers in these plantrooms and substations not only creates clear
demarcation lines that separate the main network from each individual building or estate, they also act as a
pressure break.
• The use of pressure breaks within the network means that taller buildings do not effect the pressure at which other
parts of the network have to work.
• Where plate heat exchangers are deployed, there will be a need for secondary distribution pumps and
pressurisation equipment to be installed.
Figure 19: District Heating - Demarcation
EC
EC Energy Centre
CPR Central Plantroom
SS Substation
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The hydraulic schematics within this document are for guidance only and do not constitute system design.
Some components may not be detailed for clarity purposes.
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CPR CPR
SS