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KNX city Part 3: Smart Metering Metering Definition Metering: • Metering refers the continuous measuring of physical values at intervals of a special defined time duration • KNX examples for measurement - Electrical Power in P Electrical energy consumption in W Room temperature in T Humidity in % Wind speed in m/s Gas consumption in m³ Water consumption in m³ Heat consumption in kWh … KNX can measure all physical values in buildings KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 2 May 17 Definition of Smart Metering …in terms of the general understanding: „Smart Metering“ is often related to the metering of electrical power. In comparison to normal electric meters, which count only the energy consumption (in kWh), Smart Meter devices measure additionally the electrical loads (in kW) special intervals.“ …in terms of payroll relevant metering: „Smart Metering describes the process to send measured values of e.g. gas, water, heat, power to the utility in regular recurring time intervals for time depending payroll processes (multi level tariffs)“ …in terms of control-systems: „Smart Metering describes the measurement of physical values in order to implement control-systems“ KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 3 May 17 Example payroll relevant metering: Clearance of time-dependend electricity tariffs Multi level electricity tariffs can‘t be billed without Smart Meter KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 4 May 17 KNX Control-Systems Smart Metering is the precondition for any kind of controls Controller • • A controller adapts an „actual value“ to a given „setpoint value“ and reaches the „setpoint value“ preferably without a deviation between both values Example: A heating controller shall operate the heating in a way, that the room temperature contains 23°C Control and metering task • • • • KNX Association International The „actual value“ must be measured with a „sensor“ The controller proceeds the deviation and controls an „actuator“ The „actuator“ starts an action Example: A KNX thermostat (controller) measures the room temperature with a KNX temperature sensor and controls a valve of the heating system with a KNX electronic actuator KNX: The worldwide STANDARD for home & building control Page No. 5 May 17 Control-Systems KNX provides sensors, controller and actuators of all fields KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 6 May 17 KNX ways of metering: Direct and indirect metering Direct KNX meters • The meter includes a KNX interface Indirect KNX meters • KNX Association International A KNX coupler is snapped on the meter KNX: The worldwide STANDARD for home & building control Page No. 7 May 17 KNX Electric meters: for main power circuits Quantities to be measured: • • Active power, reactive power, apparent power, voltage, current, frequency, phase angle Up to 80A per phase Intervalls of measurement and data forwarding: • • KNX Association International Intervall can be customized Or: only if changes of the measured value occur KNX: The worldwide STANDARD for home & building control Page No. 8 May 17 KNX electric sub meters: for sub power circuits Quantities to be measured: • • Active power, reactive power, apparent power, voltage, current, frequency, phase angle Up to 16A Intervalls of measurement and data forwarding: • • KNX Association International Intervall can be customized Or: only if changes of the measured value occur KNX: The worldwide STANDARD for home & building control Page No. 9 May 17 KNX electric sub meters including actuators: for sub power circuits Quantities to be measured: • • • Active power, reactive power, apparent power, voltage, current, frequency, phase angle Up to 16A Meter and switching actuator in one device Intervalls of measurement and data forwarding: • • KNX Association International Intervall can be customized Or: only if changes of the measured value occur KNX: The worldwide STANDARD for home & building control Page No. 10 May 17 KNX electric meters Differences KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 11 May 17 KNX HVAC metering Quantities to be measured: • Temperature, heat, volume, flow, gas consumption, humidity Intervalls of measurement and data forwarding: • • KNX Association International Intervall can be customized Or: only if changes of the measured value occur KNX: The worldwide STANDARD for home & building control Page No. 12 May 17 KNX sensors Quantities to be measured: • • Luminance, wind velocity, rain detection, pyranometer, air pressure, KNX Devices: thermostats, pyranometer, presence-detectors, switches, Intervalls of measurement and data forwarding: • • KNX Association International Intervall can be customized Or: only if changes of the measured value occur KNX: The worldwide STANDARD for home & building control Page No. 13 May 17 KNX M-Bus metering M-Bus and KNX are compatible M-Bus meter data (only S-Mode) can be directly transmitted to KNX via KNX RF by Multi utility gateways (MUCs) Wireless M-Bus and KNX RF telegrams can be understood by the same MUC KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 14 May 17 KNX M-Bus metering M-Bus meters can be also connected to KNX via Gateways KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 15 May 17 Utility meters and KNX Three possibilities how to read out utility meters by KNX: KNX RF snap-on couplers • The meter can be read out via a KNX RF snap-on coupler Customer interface of the utility meter • An optical KNX sensor reads out the meter MUC • KNX Association International The utility meter is connected to a MUC via an optical interface. The MUC provides the meter data to KNX KNX: The worldwide STANDARD for home & building control Page No. 16 May 17 Utility meters and KNX All kind of utility meters can be read out via KNX KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 17 May 17 Contact Lutz Steiner [email protected] KNX Association Brussels KNX Association International KNX: The worldwide STANDARD for home & building control Page No. 18 May 17