Buffer Store Control

Functionality

• Heat sources are assigned an order, representing the preferred order in which they fire, with 1 being the lead.
• Uncontrolled heat sources, such as solar thermal, has an order of 0. Heat will be taken if available and there is space.
• Heat sources with the same order will be run in duty/standby and rotated, pulling in the next in order as required.
• Heat sources are fired up according to store depletion, both on volume remaining and rate of depletion.
• Heat sources may be exercised after a period of inactivity, regardless of order.
• Modulation will be applied to heat sources where possible to match loads and minimise cycling.
• Low load buffering mode to minimise cycling.
• Timing functions can be applied.
• Includes functions for override of non-critical loads, such as central heating, when store close to empty.
• Includes functions for activation of heat dump circuits for solar thermal and biomass.
• Includes functions for boiler loading valve and pump control (with DP switch or sensor).
• Includes functions for network tempering valve control.
• Includes functions for M-Bus/Modbus heat meter reading.
• Includes alarm functions for low/high temperature, low/high pressure, low storage, failure of heat sources.
• Makes possible the implementation of storage management and sequencing based on volatile fuel prices using predicted loads

Schematics

The following schematic was generated using our open-source Heat Network Designer software.

• https://hw7.ddns.net/ui/hndesign - bivalent system
• https://hw7.ddns.net/ui/hndesign - start new design