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Intro to KNX City Panels
Guideline
1. The panels shall present KNX devices, without advertising single KNX manufactures;
2. The KNX devices shall advertise KNX functions, KNX applications and KNX solutions affecting
the energy efficiency of cities (beside the energy efficiency in buildings);
3. The visitors shall be able to interact with the panels (turning or pushing a switch, touching a
touch-panel) in order to achieve a “learning by doing”-effect;
4. All KNX devices shall be functional and able to run: therefore, all KNX devices shall be
connected to power and shall offer real applications;
5. All shown devices - also the non-KNX devices - shall mainly come from KNX members;
6. All electrical installations with which visitors interact must provide RCDs and must be
shockproof in order to guarantee the safety of visitors;
7. A KNX city logo must be placed on every panel;
8. The panel building, mobility, infrastructure and energy generation shall always be presented
together;
9. The building panel shall always contain a real electrical KNX installation in an electrical
cabinet.
1. Building-Panel
General description:
The building panel helps to introduce the structure and topology of KNX installations to booth visitors.
The building panel presents KNX functions such as the switching of lights with KNX switching
actuators and Smart Meter solutions.
The building panel presents general KNX solutions and KNX applications connected to a normal
electrical distribution. Any solutions and applications can be selected, but the focus must be on KNX
smart meter and energy efficiency solutions.
Communication Message:
1. Overall message: KNX city, the overall energy saving solution
2. Energy efficient buildings are the cornerstone of sustainable cities
3. Energy savings up to
a. 40% with KNX shading control
b. 50% with KNX individual room control
c. 60 % with KNX lighting control
d. 60% with KNX ventilation control
Panel usage
The booth visitors can operate the switches and can experience how a switching actuator inside the
cabinet switches on the LED lights. The assignment of switches and LED lights can be freely chosen.
Technical description:
The left side of the panel presents KNX meter devices such as a gas meter, heat meter, water meter
and a separate electricity meter
In the center of the panel, all KNX devices, all necessary circuit breakers and RCD’s are presented in
an electrical cabinet. The distribution board presents a typical apartment configuration and is divided
into two fields:
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Meters (electrical utility meters) for metering power generation (e.g. of a photovoltaic
system) and consumption of a building;
All other KNX devices and low voltage devices used for the distribution of the power to
several power circuits.
On the right side of the panel, three switches and LED lamps are installed. These devices are wired to
the cabinet.
Implementation and hardware
A KNX electrical installation including utility meters and switching actuators needs to be
implemented.
Hardware
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electrical cabinet (e.g. ABB, Hager)
KNX switching actuators, dimmer, actuators, etc.
3x switches + KNX bus coupler (e.g. BJE, Gira, Jung)
3x LED Lights (e.g. BJE, Gira)
KNX electricity meters (e.g. ABB, Siemens, …)
KNX meters for:
o gas (e.g. Lingg-Janke)
o heat (e.g. Lingg-janke, arcus-eds)
o water (e.g. Lingg-janke, arcus-eds)
o electricity (ABB, Siemens, etc.)
2. Mobility-Panel
General description:
The mobility panel presents a KNX solution for charging eCars. This solution is compliant with the IEC
61851-1 standard, which lays down how to charge eCars with surplus energy coming from renewable
energies (e.g. the building’s own photovoltaic system): it shows how eCars are integrated in KNX
Demand Side Management.
Only when electric cars can be charged completely with renewable energies, then their usage is truly
ecological.
Communication Messages
1. Overall message: KNX city, control of eCar charging through KNX
2. The eCar is an integral part of the building
3. KNX ensures
a. Integration of eCars in the overall building control
b. eco-friendly charging of eCars
c. Reduction of carbon dioxide emissions.
Panel usage
The objective of a KNX Demand Side Management is to adapt building loads to the available
renewable energy generation. This is done by a device controlling the load.
IEC 61851-1 lays down a pulse-width-modulation for the communication between the charging
station and the eCar, including also security functions as well as starting or stopping functions for the
charging process or control functions to change the load of the car. By using a Wago Pilot Box for
instance, ensuring the pulse-width –modulation, KNX can control this indirectly. In this way, it is
possible to establish communication with the eCar.
Technical description:
Two light tubes represent the charging cable connected to:
1. the charging box
2. the e-Car.
The panel invites visitors to set an electrical tariff level via a turning switch (placed on the left side of
the panel). Depending on the positions of the switch, the lighting of the tubes will vary, presenting
the following scenarios:
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Switch set to Tariff Green: Both tubes are lighting, representing the charging with high
current due to high availability of renewable energy;
Switch set to Tariff Yellow: Only one tube is lighting, representing the charging with low
current due to medium availability of renewable energy;
Switch set to Tariff Red: No tube is lighting, representing no charging because of insufficient
available renewable energy.
Implementation and hardware:
The change of the PWM signal can be controlled by connecting the operating voltage of the Pilot Box
to the necessary inputs. This can be realized with a conventional 4-channel KNX switching actuator
(or a KNX PLC), from any KNX Manufacturer : four of the outputs of the KNX switching actuator are
connected to the control inputs of the Pilotbox. The four inputs of the switching actuator are
connected to the operating voltage of the Pilot box. By doing so, the KNX switching actuator can
switch the operating voltage in different combinations to the control inputs of the Pilotbox. The
output PWM signal of the Pilotbox changes in dependence of its inputs and as a result the KNX
system can:
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Vary the charging current;
Start or stop the charging process.
The lighting of the tubes can be realized with a KNX switching actuator and a turning switch
combined with a universal interface.
Hardware, front of the panel:
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1 Wago Pilot Box
1 switching actuator or, alternatively, a Wago KNX PLC including relays.
A conventional turning switch (e.g. BJE) including universal interface
2 light tubes
Home-charger (e.g. Siemens)
Case/Box for KNX devices
Hardware, back of the panel:
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KNX installation for control of the switching actuator
3. Infrastructure Panel
General description:
This panel presents a KNX solution for distributed facilities. It shows how to connect different KNX
trades at different locations with each other. This panel focuses especially on KNX IP and the usage
of KNX IP Routers in order to implement a comprehensive energy management in cities and
especially closed campuses.
Communication Messages:
1. Overall message: KNX city, uniting distributed facilities to one overall network
2. Individual Homes and Buildings become interlinked
3. KNX ensures
a. the cross-linking of buildings
b. demand side management
c. Extending building control to become city control
Panel usage:
This solution connects different KNX installations in different buildings via IP or Internet.
A KNX solution connecting different trades or buildings, a so called “distributed facilities” solution, is
shown on this panel. Visitors can experience the live monitoring of the energy condition of the booth.
As it is not possible to meter a building at a fair, this solution needs to be simulated. So, instead of
metering a building, the different parts of the booth are metered.
Technical description:
At the top, the KNX Cloud shows a screen visualizing three different power consumption scenarios (of
three different trades that are interconnected). Possible measurements can be:
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Total power consumption of the booth (Load1)
Power consumption of the lights from the booth (load2)
Power consumption of the panel area (load3)
The three scenarios symbolize the metering in three different KNX trades via KNX Smart Meter
devices, which are connected via internet to each other.
Implementation and hardware
For the measurement, two joint boxes including three phase KNX energy meters and associated
circuit breakers have to be used. These boxes need to be connected to the electrical installation of
the booth. The third measurement value can be obtained by adding the first two measurement
values. If joint boxes cannot be used, it is also an option to place the measurement devices inside the
electrical cabinet of the building panel.
Hardware, front of the panel:
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3 KNX IP Routers
1 KNX visualization
Hardware, back of the panel:
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KNX IP Interface for visualization
KNX power supply
2 KNX joint boxes including
o KNX three phase energy meter
o 3 pole circuit breaker
4. Energy Generation
General description:
The energy generation panel presents the working of a KNX Demand Side Management including
loads from white goods, HVAC, home loads such as power outlets and an eCar. The panel gives an
overview of these trades and can be used to inform the booth visitors about the interfaces between
these trades and KNX.
Communication messages:
1. Overall message: KNX city, integrating renewables with KNX
2. Renewables are an integral part of the building
3. KNX ensures
a. Reduction of fossil fuels demand
b. Increase of self-consumption of renewable power
c. Greener cities
Panel usage:
The booth visitors can set via two turning switches the different conditions of energy generation and
tariff. According to the setting of the switches, different LEDs will light up, symbolizing the activation
(when LED is on) or deactivation (when LED is off) of the different loads.
In this way, the booth visitor experiences the working of KNX demand side management: the
functioning of KNX demand side management is virtually shown on the panel via a symbolized load
adaption.
The objective of the KNX demand side management is to adapt the loads to the level of renewable
energy generation of the grid (symbolized by a multi-level electricity tariff) and an own renewable
generation of the building (symbolized by wind and sun symbols).
The following table gives an overview of the different possible conditions: it shows which application
domains remain active (are not switched off by the KNX demand side management) depending on
the tariff level and the level of generation of renewable energy.
Tariff
cheap
middle
expensive
Renewable Generation
low
Middle
White goods
White goods
HVAC
HVAC
Home-Loads
Home-Loads
Home-Loads
Home-Loads
White goods
White goods
HVAC
Home-Loads
Home-Loads
HVAC
Excess
All
All
All
Technical description:
The left side of the panel shows 2 switches. Each switch must have 3 positions for simulating the
different scenarios:
1. Tariff switch: 3 possible scenarios: cheap, middle and expensive
2. Renewable generation switch: low, middle, excess
On the central area of the panel, a distribution board is installed, containing the following 3 parts:
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A KNX PLC in order to read out a multi-level electricity tariff
Two electrical utility meters, one for measuring the energy consumption of a photovoltaic
system and one for measuring the total building consumption
The rest being KNX devices for the load adaption of home loads such as switching
actuators, circuit breakers and RCDs
On the right side panel, LED lights are located between the electrical cabinet and the different
(simulated) loads. Each LED represents an active load, e.g. washing machine, dish washer, eCar
charger, lighting in a home, brown goods, etc.
Implementation and hardware:
Either the KNX electrical installation is implemented in its entirety or a distribution board is
represented in printed form on the panel, on which only a few KNX devices are physically
mounted. The control of the LED’s depending on the turning switches can be implemented
with a lighting scene.
Hardware, front of the panel:
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4 x LED
2 x turning switches (e.g. BJE)
Electrical cabinet
o 1 x KNX switching actuator
o 1 x KNX power supply
o 1 x KNX logic device for light scene
o different actuators
o 1 x KNX PLC
Hardware, back of the panel (only if the electrical cabinet is represented in printed form):
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1 KNX installation including power supply, switching actuator
5.
Communication Panel:
General description
The Communication panel is not a display which exits in a real city. It is only used on the KNX city
booth for communicating the overall advantages and contributions from KNX city to the city. The
communication panel includes a TV screen for showing a presentation about the benefits of KNX city:
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Use of renewable energy in order to cover the energy demand
Reduction of loads when there is a shortage of renewable energy generation
Avoiding voltage band violations (by load reduction) resulting from high feed from renewable
energies or high loads resulting from charging processes of e-vehicles at the same time
Avoiding possible overloads e.g. resulting from simultaneous charging processes of eCars or
other high loads elements
Communication messages
Creating Green, Comfortable and Energy Saving Buildings for Modern City Life
Panel usage
The booth visitor can experience the benefits of KNX city by watching the presentation
Technical description
The communication panel needs only a screen including a TV in the background for running the
presentation. The panel is named ‘Communication’, because the KNX city is realized on the basis of
an Information and Communication Technology structure in the city (including power grid and
remaining infrastructure).
Implementation and hardware
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Computer for presentation
TV screen