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KNX city Part 4: Energy management. Definition of Energy efficiency. …in terms of the building „The objective of energy efficiency in the building is to save all forms of energy which are brought to the building from the outside by energy carriers such as gas, oil, electricity and water.“ - PowerPoint PPT Presentation
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KNX cityPart 4: Energy management
KNX Association International Page No. 222 April 2023
KNX: The worldwide STANDARD for home & building control
Definition of Energy efficiency
…in terms of the building„The objective of energy efficiency in the building is to save all forms of energy which are brought to the building from the outside by energy carriers such as gas, oil, electricity and water.“
… in terms of cities„ The objective of energy efficiency in cities is to save primary-energy such as fossil energy sources“
…in terms of „power supplies“„The objective of energy efficiency in power supplies is to reduce the electrical energy harvest from fossil energy sources and to increase the energy harvest from renewable energies“
KNX Association International Page No. 322 April 2023
KNX: The worldwide STANDARD for home & building control
Field of applications in the buildingExamples:
Commercial buildings:• Avoiding of heat losses occuring by opening windows over weekends• Avoiding heat losses by KNX heat and air conditioning control• Saving electrical energy by light control via presence-detection• Saving electrical energy by light-intensity and day-light control• …
Domestic homes• Saving energy by visualization of actual and total energy consumptions.• Saving energy by heat- and and air-conditioning controls• Saving energy by louver-controls (avoiding over overheating)• Comfort Aspects• New applications: Demand Response, Demand Side Management• …
KNX Association International Page No. 422 April 2023
KNX: The worldwide STANDARD for home & building control
KNX solutionsClassic fields of application
KNX offers total building controls• Lighting• Blinds & shutters• Security systems• Energy management• HVAC Systems• Monitoring systems• Remote control• Metering• Audio/Video• White goods
How to realize an energy management?
KNX Association International Page No. 522 April 2023
KNX: The worldwide STANDARD for home & building control
KNX control Systems
Controller• A controlller adapts an „actual value“ to a given „setpoint value“ and
keeps the „setpoint value“ 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
• 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 Association International Page No. 622 April 2023
KNX: The worldwide STANDARD for home & building control
KNX Open-loop-control systems
Open loop Controller• A controller changes the „actual value“ in dependence of an input value
without getting a feedback about the real changes of the actual value• Example: A switching actuator is controlled in dependence of a
presence-detector Control and metering task
• Sometimes the setpoint value is set proportional to a measured value• Example: The angle of a louver is controlled in dependence of the sun
light. The sun light is measured by a weather-station. The setpoint value is set by a fixed table which describes the relation between angle and sun light.
Smart metering is a precondition Only the interaction between metering and actuators can
realize an energy management
KNX Association International Page No. 722 April 2023
KNX: The worldwide STANDARD for home & building control
Smart MeteringSmart Metering as a precondition for energy management
KNX Association International Page No. 822 April 2023
KNX: The worldwide STANDARD for home & building control
KNX solutionsExample: Open-loop light control
Presence-detectors detect if persons are present in the room• Yes: lights will be switched on• No: lights will be switched of
Application is often used for restrooms in commercial buildings
Electrical Energy can be saved
KNX Association International Page No. 922 April 2023
KNX: The worldwide STANDARD for home & building control
KNX solutionsExample: Open-loop light Control
KNX Association International Page No. 1022 April 2023
KNX: The worldwide STANDARD for home & building control
KNX solutionsExample: Open-loop blinds & shutters control
Shutter-angle can be controlled in dependence of the position of the sun
Application is often used in Domestic Homes
Energy of systems for air conditioning can be saved
KNX Association International Page No. 1122 April 2023
KNX: The worldwide STANDARD for home & building control
KNX solutionsExample: Open-loop blinds & shutters control
KNX Association International Page No. 1222 April 2023
KNX: The worldwide STANDARD for home & building control
Cascaded heat control:Example: HVAC control
Cascaded control of a floor heater and an air conditioning system
The thermostat measures the actual temperature and adapts the room temperature to the setpoint temperature
Thermal energy can be saved
KNX Association International Page No. 1322 April 2023
KNX: The worldwide STANDARD for home & building control
Cascaded heat control:Example Control-System: HVAC Control
Advantages:• One thermostat controls two heat devices• More than one control panel can be used for setting the setpoint
temperature of the thermostat• The cascaded control balances the slow thermal behavior of the floor
heater with a fast thermal behavior of the air conditioning system
Both thermal systems don‘t control against each other
The control of several thermal systems such as floor heaters, heatpumps, etc. is with KNX possible
KNX Association International Page No. 1422 April 2023
KNX: The worldwide STANDARD for home & building control
Demand Side Management
Definition of Demand Side Management• „Demand Side Management describes the process to change the
energy demand of customers by incentives in order to get a better coverage of the energy generation“
• KNX can help by adapting loads
KNX Association International Page No. 1522 April 2023
KNX: The worldwide STANDARD for home & building control
Demand Side Management:Control
The implementation with KNX is possible
KNX Association International Page No. 1622 April 2023
KNX: The worldwide STANDARD for home & building control
KNX Energy Management solutions
More solutions can be found in:
KNX Association International Page No. 1722 April 2023
KNX: The worldwide STANDARD for home & building control
Contact
Lutz Steinerlutz.steiner@knx.org
KNX Association Brussels
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