Building automation â impact on energy efficiency - Siemens ...

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Remarks of Siemens This section outlines how Siemens interprets the functions and processing functions according to EN 15232:2012. 5. The following main features distinguish TABS from other heating and cooling systems: - TABS is a low-temperature heating/high temperature cooling system - TABS activates relatively large thermal storage These features permit energy-efficient operation in a number of cases 6. As a rule, there is only a single flow temperature setpoint per zone (heating and cooling – no setpoint range. This means: Frequently slight overheating or undercooling during transition periods (where heating and cooling are released). 7. A setpoint range is used here; one setpoint each can be preset separately for heating and cooling. This eliminates to some extent overheating or undercooling. 26
AUTOMATIC CONTROL 1 HEATING CONTROL BT Reason for energy savings 1.2 Emission control for TABS 5 0 No automatic control of the room temperature The highest supply output is continuously delivered to the TABS, resulting in the supply of unnecessary thermal energy under part load conditions. 1 Central automatic control The central automatic control for a TABS zone (which comprises all rooms which get the same supply water temperature) typically is a supply water temperature control loop whose set-point is dependant on the filtered outside temperature, e.g. the average of the previous 24 hours. 2 Advanced central automatic control This is an automatic control of the TABS zone that fulfills the following conditions: – If the TABS is used only for heating: The central automatic control is designed and tuned to achieve an optimal self-regulating of the room temperature within the required comfort range (specified by the room temperature heating set-point). "Optimal" means that the room temperatures of all rooms of the TABS zone remain during operation periods in the comfort range, to meet comfort requirements, but also is as low as possible to reduce the energy demand for heating. – If the TABS is used for heating and cooling: The central automatic control is designed and tuned to achieve an optimal self-regulating of the room temperature within the required comfort range (specified by room temperature heating and cooling setpoints). "Optimal" means that the room temperatures of all rooms of the TABS zone remain during operation periods in the comfort range, to meet comfort requirements, but also uses as far as possible the full range to reduce the energy demand for heating and cooling. – If the TABS is used for heating and cooling: the automatic switching between heating and cooling is not done only dependent on the outside temperature, but also taking at least indirectly the heat gains (internal and solar) into account. 3 Advanced central automatic control with intermittent operation and/or room temperature feedback control: a) Advanced central automatic control with intermittent operation. This is an advanced central automatic control according to 2) with the following supplement: The pump is switched off regularly to save electrical energy, either with a fast frequency - typically 6 hours on/off cycle time - or with a slow frequency, corresponding to 24 hours on/off cycle time. If the TABS is used for cooling, intermittent operation with 24 hours on/off cycle time can also be used to reject the heat to the outside air if the outside air is cold. b) Advanced central automatic control with room temperature feedback control. This is an advanced central automatic control according to 2) with the following supplement: The supply water temperature set-point is corrected by the output of a room temperature feedback controller, to adapt the set-point to non-predictable day-to-day variation of the heat gain. Since TABS react slowly, only day-to-day room temperature correction is applied, an instant correction cannot be achieved with TABS. The room temperature that is fed back is the temperature of a reference room or another temperature representative for the zone. c) Advanced central automatic control with intermittent operation and room temperature feedback control 6 Supply output is controlled depending on the outside temperature, for example (corresponding to the probable heat demand of the consumers). Energy losses under part load conditions are reduced, but no advantage can be taken of individual heat gains in the rooms. 7 Supply output is controlled depending on the outside temperature, for example (corresponding to the probable heat demand of the consumers). Taking advantage of self-regulating effects during operating times fulfills comfort requirements in all the rooms and reduces heat demand as much as possible. Different setpoints for heating and cooling (e.g. through the use of a setpoint range for the flow temperature) can prevent unnecessary overheating or undercooling. Additional energy can be saved by compensating for known heat gains in the building (e.g. by adjusting the flow temperatures over the weekend in office buildings – if there are no internal heat gains). Within a specified outside temperature range (transition period), the changeover between heating and cooling occurs (indirectly) based on heat gains in the building. This may enhance comfort and automate operation (no need for the operator to manually change over). a) Even more electricity can be saved through pump cycling operation. In addition, the on phases can be executed in some cases if energy efficiency can be gained or at times when energy is available at lower rates (e.g. cooling at night at low outside temperatures or at lower rates). b) Heat gains can be used to save energy through the use of room temperature control in a reference room by readjusting the flow temperature setpoint. Room temperature control automates the compensation of additional or missing heat gains and, if required corrects incorrectly set weather-compensated control in a restricted range. 27
Page 1: Building a
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The calculation of the impa
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Simplified calculation method The B
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In efficiency class C, the differen
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Hospital Time of day Hotel Restaura
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4.4 Overall BACS efficiency factors
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E 4.3 E 4.4 E 4.5 establish pertine
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consumption occur. Log all signific
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E 6 3.6 Review of the energy manage
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License The license confirms that t
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5.2 Customer benefits resulting fro
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6 Energy efficiency from Siemens 6.
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6.1.1.2 Desigo PX The Desigo PX bui
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6.1.1.4 Desigo RXC/RXB/RXL Desigo R
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Straightforward operation and quick
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Control room temperature by use Hea
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6.2.2 Energy Efficiency Calculation
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Advantage Services is a comprehensi
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Phase 2 Implement success The follo
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What is Performance Contracting ? 6
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7 Information and documentation We
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7.2 Document index 7.2.1 Literature
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8 Abbreviations and terms 8.1 Abbre
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Siemens Switzerland Ltd Infrastruct
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