HEIDELBERG, 24.05.2019 Expert Heating/Cooling circuit control › public ›...

HEIDELBERG, 24.05.2019

Expert – Heating/Cooling circuit controlClimaECO – Optimization of a supply setpoint temperature

Team Application Engineering

Foreword

Expert - HCC/S 2.x.x.1 & AC/S 1.x.1

May 24, 2019 Slide 2

Calculatedweather

compensated

Economy mode

Room involvement

The following documentation shows the interaction between HCC/S and AC/S. Specifically, the three possibilities for optimization combined with the correct settings in the ETS parameters are explained.

Foreword



To parameterize the application controller, a DCA (Device Configuration App) in the ETS is used. This app can be downloaded from the KNX shop.

Note:In the Engineering Guide Database, there is a video tutorial as an example of how to install an "ETS app" correctly.

http://www.my.knx.org/shop

https://new.abb.com/low-voltage/products/building-automation/support/engineering-guide-database

https://www.youtube.com/embed/GhXI_h40Y3Q?html5=1&rel=0&wmode=transparent&autoplay=1

Introduction to DCA



1) ASM library-> All the currently available ASMs (Application-Specific automation Modules) are here

2) Workspace-> An ASM selected can be parameterized in this space

3) Structure-> Here you can form a "building structure" for the web user interface, so-called "containers"

4) Parameters-> View of all possible settings



DCA Structure view AC/S WebUI

DCA Linking view

Overview of DCA and WebUI

These views appear time and again on the slides that follow.The user's options for configuration and visualization are shown.



Optimization: Calculated weather compensated

The weather compensated optimization requires interaction between the AC/S and HCC/S.

The graphic shows that the AC/S requires the outside temperature as the basis for the calculation so that it can then pass the supply setpoint temperature to the HCC/S.

The following slides show one possible way of implementing this optimization practically (in software).



1. Parameterization of the HCC/S

The HCC/S can be used in its basic function as a "controller" with the default parameters.

The HCC/S receives the calculated supply setpoint temperature from the AC/S via the "Heating setpoint temperature" group object.

The HCC/S must have the supply flow temperature in the heating circuit so it can calculate the control value for the mixing valve!!

The temperature can be measured using a sensor connected to the physical device input on the HCC/S. Alternatively, there is also a KNX object available here (measurement via external sensors).

OR




The actual control value for heating is output by the HCC/S via the "Status heating control value" group object.

The pump follows the control value of the valve. This signal is forwarded internally to the pump output on the HCC/S.

Whether the switching contact is closed or open can be seen via the "Status pump relay" group object.

The mixing valves are connected to the corresponding physical device outputs (see technical data).




requiredoptional

Selection of the required and optional ASMs for the "Calculated weather compensated" optimization.

2. Parameterization of the AC/S



May 24, 2019 Slide 10

Value ASM: This ASM can exchange any data between the various interfaces on the AC/S (KNX, BACnet, web user interface and ASM sockets).Only one value can be transferred per Value ASM. The data point type used can be selected as required.

Heating distribution circuit ASM:This ASM calculates the supply setpoint temperature and sends the value calculated to a heating distribution circuit controller (HCC/S). The ASM also permits the display and operation, via the module's web user interface, of the heating distribution circuit controller linked via KNX.

Trend ASM:The application controller can record up to five independent values in the AC/S over a configurable period using this ASM. The recordings are saved in the device. They can be displayed on the web user interface and exported from there.

2. Parameterization of the AC/S (description of the ASMs)



May 24, 2019 Slide 11

2. Parameterization of the AC/S (explanation – "Heating distribution circuit" ASM)

AttentionThe values marked with a red frame affect the calculation of the heating curve.

These variables are to be agreed with the heating engineer and the system engineer!

For the simple "Calculated weather compensated" optimization, the heating distribution circuit ASM can be used with the default parameters.



May 24, 2019 Slide 12

2. Additional information (design values – "Heating distribution circuit" ASM)


The most important parameters that actively affect the heating curve are explained on the following "Additional information (design values – "Heating distribution circuit" ASM)" slides.

The way this curve is affected must always be individually adapted to the situation and the related system; agreement with the heating engineer on site is necessary.

There is no general model system. Every system is different!


May 24, 2019 Slide 13



Nominal outside temperature:Here the standard outside temperatures for the related climatic zones according to EN 12831 are used.

Together with the nominal supply temperature, this parameter specifies the heating power that must be supplied to the system at the lowest outside temperature (according to the example: -4 °C or -14 °C) to be able to achieve a room temperature of 20 °C (sense of well-being).


May 24, 2019 Slide 14



Nominal room temperature + Start heating curve at outside temperature:These two parameters specify both the minimum supply setpoint temperature…


May 24, 2019 Slide 15

…and the start of the heating curve.




May 24, 2019 Slide 16


Nominal return temperature:Minor adjustments to the curve (curvature) can be made using this parameter.

Here the following applies: The higher the value, the greater the curvature on the curve.



May 24, 2019 Slide 17



Max. supply temperature:The highest possible supply temperature in the system is limited using this parameter. From this point the heating curve calculated is "truncated".

The max. supply temperature should be set to suit the "Nominal supply temperature". In this way the full operating area of the curve remains visible.


May 24, 2019 Slide 18



Radiator exponent:The radiator exponent is a constant that describes the dependency of the heating power of a radiator on its temperature. These data can be found in the technical data sheet on the radiator.

The higher the exponent (between 1.0 and 1.5), the more curvature there is on the heating curve calculated.



May 24, 2019 Slide 19

1 to 1.1

• Thermal conduction limited to solid body (floor heating)

• Almost exclusively thermal radiation

~ 1.1 to 1.2

• Heat emission by thermal radiation at low temperatures (e.g. 30 °C) normally have: 1.1

• Heat emission by thermal radiation at high temperatures (e.g. 80 °C) normally have: 1.2

~ 1.25 to 1.45

• Heat emission by natural convection: 1.4

• Normally for radiators: 1.2 or 1.3 (radiation element predominates)

• For convectors (e.g. convection reinforced by rib structure) more like 1.25 to 1.45

Typical radiator exponents in heating systems

2. Additional information (radiator exponent – "Heating distribution circuit" ASM)


May 24, 2019 Slide 20

For the Value ASM, the template is to be adapted to the requirements (KNX, BACnet, …).

It is necessary to set the appropriate data point type depending on the group object to be linked.

In our example it is the outside temperature:

Main data point type: 9.xxx [2-byte float value]Data point type: 9.001 [temperature (°C)]


2. Parameterization of the AC/S (explanation – "Value" ASM)


May 24, 2019 Slide 21

The number of trend points and their range are to be specified in the parameters for the Trend ASM (max. five trend points per ASM).

Here the corresponding data point type is to be assigned to each trend.

Interfaces


2. Parameterization of the AC/S (explanation – "Trend" ASM)


May 24, 2019 Slide 22

If the ASMs have been parameterized as described, the following KNX group objects can be seen as in the example.

Input: The outside temperature, e.g. from a weather unit, is linked to the "Output: Value (outside temperature)" object.


2. Parameterization of the AC/S (KNX group objects)

Output: The "Supply setpoint temperature" object is passed to the HCC/S. (Calculated value based on the outside temperature)

Optional: The following objects can be linked to the HCC/S remote terminals for the display of the values in the AC/S WebUI.


May 24, 2019 Slide 23


2. Parameterization of the AC/S (Linking view in the DCA)

How do I move the ASM from the library to the workspace, here consisting of a container "Optimization HCC"?

One possible way, as can be seen on the right, is to drag the required module to the workspace with the left mouse button pressed (drag & drop).

Alternatively, the module can be moved to the workspace by double-clicking.


May 24, 2019 Slide 24



How can I select several ASMs and then change to the Linking view?

First you must select "Multiple selection" using the left mouse button. Then select the check boxes for the required modules and change to the "Linking view".

Alternatively, you can select the modules using Ctrl+left mouse button (black frame after selecting) and then change.


May 24, 2019 Slide 25



How to link the ASM with the necessary sockets?

Position the modules are required in the Linking view using "drag & drop". Then establish a connection between the sockets with the left mouse button pressed.

A successful (possible) connection is indicated using a green check mark.


May 24, 2019 Slide 26




May 24, 2019 Slide 27


2. Parameterization of the AC/S (description of the linking)

The Heating distribution circuit ASM has an "Outside temperature" input socket. This socket cannot be seen on the KNX page and it is therefore essential it is connected to another ASM (yellow ).

As seen in the example on the right, this can be a Value ASM that then forwards the outside temperature to the Heating distribution circuit ASM via KNX, BACnet or WebUI!

In the example there is an optional TrendASM that records the various output variables over the long-term (up to 3 years).


May 24, 2019 Slide 28


3. AC/S WebUI view (detailed view of the Heating distribution circuit ASM)


May 24, 2019 Slide 29



Parameter settings already made can also be changed in the WebUI.

The values can also be overwritten by the values specified in the ETS. For this purpose, the "Reinstall" check box must be selected in the parameters before the download. This setting applies to all ASMs!


May 24, 2019 Slide 30



This example shows the heating curve at 10 °C outside temperature. The result is a supply setpoint temperature of 40.2 °C.


May 24, 2019 Slide 31


3. AC/S WebUI view (custom supply temperature curve)

The view above shows a heating curve with value pairs that can be specified by the user.

The heating curve must be specified manually using at least two and maximum five value pairs!


May 24, 2019 Slide 32

Optimization: Economy mode

The "Economy mode" optimization requires the implementation of operating modes in the AC/S.

A freely definable room setpoint temperature saved in the AC/S is assigned to each operating mode. The supply setpoint temperature is increased or reduced and sent to the HCC/S 2.x.x.1 depending on the operating mode currently in use.



May 24, 2019 Slide 33

requiredoptional



Selection of the required and optional ASMs for the "Economy mode" optimization.


May 24, 2019 Slide 34


1. Parameterization of the AC/S (description of the (new) ASMs used)

Room setpoint temperatures ASM:With this module, room setpoint temperatures for the various room operating modes (Comfort, Standby, Economy and Building Protection) can be set centrally for several rooms via the web user interface. The application controller outputs the room setpoint temperatures on the KNX bus, on the ASM output socket and on BACnet. If the values are linked to several controllers at the same time, these values can apply to several rooms.


May 24, 2019 Slide 35

Economy mode

Based on Scheduler(Operating mode)

Based on the current room setpoint temperatures

(Max temp. object)


1. Parameterization of the AC/S (types of economy mode)

There are two types of economy mode that can be selected in the parameters for the Heating distribution circuit ASM.

Both possibilities are described on the following slides!


May 24, 2019 Slide 36

Optimization: Economy mode (Based on Scheduler)


In the parameters for the Heating distribution circuit ASM, select the economy mode function "Based on Scheduler".

Use the "Operating mode" interface to switch between the operating modes.

The room setpoint temperatures for the individual operating modes are linked to the related socket.

New interfaces


May 24, 2019 Slide 37

Interfaces are specified in the form of operating modes in the parameters for the Room setpoint temperatures ASM.Select here the corresponding check boxes.

In the second step, initial values are specified for the related operating modes.

Interfaces


1. Parameterization of the AC/S (explanation – "Room setpoint temperatures" ASM)


May 24, 2019 Slide 38




May 24, 2019 Slide 39


1. Parameterization of the AC/S (linking the MAX input sockets)

In addition to the room setpoint temperatures already linked, the "MAX input sockets" can also be linked to the "Value ASM". As a result there are further interfaces on the KNX, for example to a higher-level visualization.

The highest object value present is then applied for the calculation.


May 24, 2019 Slide 40

In the parameters for the Heating distribution circuit ASM, select the economy mode function "Based on the current room setpoint temperatures".

The max. room setpoint temperature interface is displayed in the Linking view.

Interface

Optimization: Economy mode (Based on the current room setpoint temperatures)



May 24, 2019 Slide 41

Optimization: Economy mode (Based on the current room setpoint temperatures)


Based on the same principle as already used for the scheduler based economy mode, there can be multiple links to the "MAX input socket" here.

For this purpose, several "Value ASMs" are also linked, in the example room setpoint temperature 1-3.


May 24, 2019 Slide 42


2. AC/S WebUI view (Based on Scheduler)


May 24, 2019 Slide 43



The values in a red frame are the room setpoint temperatures and the operating mode saved in the AC/S. These are only displayed here and cannot be changed in the detailed view of the Heating distribution circuit ASM.


May 24, 2019 Slide 44



With the "Economy mode – Based on Scheduler" optimization, the heating curve is essentially based on the first "Calculated weather compensated" optimization. The related heating curves for the operating modes (Comfort, Standby, Economy and Building Protection) and the related supply setpoint temperatures at 5 °C are shown in different colors.


May 24, 2019 Slide 45


2. AC/S WebUI view (Based on the current room setpoint temperatures)

The maximum room temperature received from rooms 1 to 3 (slide 41) is displayed in the WebUI.

Click here


May 24, 2019 Slide 46


May 24, 2019 Slide 46

Optimization: Room involvement

For the last and therefore also the most efficient type of optimization, "Room involvement", the actual room demand is included in the calculation. For this purpose it is imperative the related valve control values from each individual room are acquired and can be transmitted to the AC/S.

This optimization can be integrated into the heating/cooling system in addition to the already familiar optimizations.



May 24, 2019 Slide 47



Selection of the required and optional ASMs for the "Room involvement" optimization.

requiredoptional


May 24, 2019 Slide 48

Interface

Interface



Select the check box for Room involvement in parameters for the Heating distribution circuit ASM.New interfaces are generated in the Linking view.

In the second step, the parameters for the room involvement are specified.


May 24, 2019 Slide 49


1. Parameterization of the AC/S (explanation – "room involvement parameters")

Setting for the maximum increase as well as decrease in the supply temperature depending on the room control value.

Optimum room control value → If there are deviations, the supply temperature is decreased or increased correspondingly. This is the desired valve control value.

The calculation delay refers to the KNX download. During operation, any increase or decrease is calculated internally every 5 min.


May 24, 2019 Slide 50


Using the "Room involvement" function, the supply setpoint temperature is increased or decreased until the MAX room control value on the input of the Heating distribution circuit ASM reaches or approaches the optimum room control value set.

If the maximum room control value is lower than the optimum room control value, the adjustment (room involvement) is negative.

If the maximum room control value is greater than the optimum room control value, the adjustment (room involvement) is positive.

→ Two example calculations are given on slide 52+53.


May 24, 2019 Slide 51


The possible "operating limits" for the adjustment are ±10K as per the default parameters. Depending on whether the supply temperature is to be increased or decreased.

A further important parameter is the "Controller proportional factor Xp". This factor specifies how quickly or slowly the system makes the required adjustment to the supply setpoint temperature. The smaller the "Proportional factor Xp", the quicker the control value is approached, because the supply temperature increases quickly and the valve control values are decreased (example 2).

→ This factor should therefore not be set too low to prevent frequent overshoots.


May 24, 2019 Slide 52

Maximum room control value = 55 [%]Optimum room control value = 70 [%]

Room involvement: 15/30 = 0.5 --> 50% of -10K = -5K

Because the maximum room control value is lower than the optimum room control value, the adjustment (room involvement) is negative.

→ The supply setpoint temperature is reduced by -5K!!!

Difference = -15

Beispiel 1:



May 24, 2019 Slide 53

Maximum room control value = 65 [%]Optimum room control value = 48 [%]

Room involvement : 17/20 = 0.85 --> 85% von +12K = +10,2K

Because the maximum room control value is greater than the optimum room control value, the adjustment (room involvement) is positive.

→ The supply setpoint temperature is increased by +10.2K!!!

Difference = +17

Beispiel 2:



May 24, 2019 Slide 54




May 24, 2019 Slide 55




May 24, 2019 Slide 56

The values in a red frame are the settings for the room involvement that can be parameterized.

The "Max. room control value" is the largest valve control value fed back from the rooms. The "Room involvement" variable is the effective difference in relation to the calculated supply setpoint temperature.




May 24, 2019 Slide 57



This example shows the heating curve at 10 °C outside temperature. With the optimization, the result is a supply setpoint temperature of 36.2 °C.


May 24, 2019 Slide 58

Complete package of optimizations

Cooling curve


May 24, 2019 Slide 59

Excerpt from the HCC/S parameter page "Application parameters"

Similar to the heating circuit control, the "Cooling distribution circuit ASM" is available for the cooling circuit control. This also calculates the supply setpoint temperature of a cooling circuit.

For this purpose the HCC/S must be adapted to suit the cooling application.

The cooling curve must be specified manually using five value pairs!

Cooling curve


May 24, 2019 Slide 60

The view above shows a cooling curve with value pairs that can be specified by the user.


May 24, 2019 Slide 61

Trends and schedulers in the AC/S

WebUI access to the curves

"Everything from a single source" – "One system"

Energy savings

Can be integrated into existing systems

Advantages of ClimaECO

May 24, 2019 Slide 62

You will find further valuable information on the topic of "ClimaECO" in the

Engineering Guide Database

FAQ Tool

https://new.abb.com/low-voltage/products/building-automation/support/engineering-guide-database

https://new.abb.com/low-voltage/products/building-automation/support/faq

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