[SplyHw24] Supply chain hot water, demand evaluation
Program block, name / node subtype: [SplyHw24] Supply chain hot water, demand evaluation
Library hierarchy: Coordination
Family: SplyHw
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Configurator
Program blocks are stored in the library without I/Os. Use the auto-create and auto-connect functions to create I/Os and/or to connect them to the interface blocks, e.g., R_A, CMD_B. Alternatively, take the I/Os from the folder containing the predefined I/Os in the library and/or from the plant and connect them to the interface blocks.
SplyHw24 connects one or more hot water consumers, e.g., room thermostats, such as, RDG26XxKN, to the heating plant.
The most important functions in the program block are:
- Heating demand collection and evaluation
- Hot water temperature setpoint calculation and its correction based on the hot water demand value (0-100 %)
Name | Description | Type | Alarm / Notification class | Trend / Type | |
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SpHReq | Setpoint for heating request | ACalcVal: Analog calculated value | N/A | N/A | |
HReq | Heating request | BCalcVal: Binary calculated value | N/A | N/A | |
Name | Description | Type | Alarm / Notification class | Trend / Type | |
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SpHReqMin | Minimum setpoint heating request | ACnfVal: Analog configuration value | N/A | N/A | |
Hcrv | Heating curve | [Hcrv23] Heating curve, flow temperature setpoint calculation, with CHAR | N/A | N/A | |
Description |
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Setpoint correction for flow temperature based on valve position evaluation Elements that belong to this option: Setpoint correction for lower flow temperature | ACnfVal: Analog configuration value Setpoint correction for higher flow temperature | ACnfVal: Analog configuration value |
Heating demand collection and evaluation
SplyHw24 receives an analog hot water demand signal from consumers and calculates a binary value for the heating request output pin [HReq] and for a binary calculated value.
Hot water temperature setpoint calculation and its correction based on hot water demand valve evaluation of the consumers
SplyHw24 receives a hot water demand value from consumers.
A linear function (configurable) uses this value to calculate a hot water supply temperature setpoint correction value between SpCorrTFlHi and SpCorrTFlLo:
Key
SpCorrTFlHi | Setpoint correction for higher flow temperature |
SpCorrTFlLo | Setpoint correction for lower flow temperature |
HwDmdVal | Supply chain hot water demand value |
The calculated setpoint correction value is added to the base setpoint. The base setpoint is calculated by applying a heating curve (see figure) based on the outside air temperature [TOa]. The result is the hot water heating request setpoint value [SpHReq] (chart output pin) and an analog calculated value.
Key
SpTFlDs | Flow temperature setpoint for design outside temperature |
SpTFlHi | Flow temperature setpoint for high outside temperature |
TOaDsgn | Design outside temperature |
TOaHi | Outside temperature high |
The suggested setpoint value [SpHReq] can be delivered to the heating plant or other coordinator(s) (SplyChw23).