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. Control of heat recovery in the centralized air handling unit. 6. Cooling and ventilation with a portion provided by passive energy (renewable and free, may however require auxiliary energy, e.g. electrical energy for pumps). This reduces the percentage of active energy (that has to be paid for) 48
AUTOMATIC CONTROL 4 VENTILATION AND AIR CONDITIONING CONTROL BT Reason for energy savings 4.4 Heat recovery control (prevention of overheating) 5 0 Without overheating control There is no specific action during hot or mild periods 1 With overheating control During periods where the effect of the heat exchanger will no more be positive a control loop between "stops" and "modulates" or bypass the heat exchanger 4.5 Free mechanical cooling 6 0 No automatic control 1 Night cooling The amount of outdoor air is set to its maximum during the unoccupied period provided: 1) the room temperature is above the set point for the comfort period 2) the difference between the room temperature and the outdoor temperature is above a given limit. If free night cooling will be realized by automatically opening windows there is no air flow control. 2 Free cooling The amount of outdoor air and recirculation air are modulated during all periods of time to minimize the amount of mechanical cooling. Calculation is performed on the basis of temperatures Heat recovery is always on 100% and can overheat the supply air flow, requiring additional energy for cooling. Temperature sequence control at heat recovery prevents unnecessary recooling of the supply air. Supply air is always mechanically cooled as required using active energy Night cooling (passive cooling): During the night, heat stored in the building mass is removed by cool outdoor air until the lower limit of the comfort range is reached, reducing the use of active cooling energy during the daytime. Reduces energy demand on active cooling of supply air: Maximum Economy Changeover (MECH): Heat recovery is opened whenever the exhaust air temperature is lower than the outside temperature. Production of chilled water with outside air: (from supply air via cooling coils and coolant directly to cooling tower). Has priority (favorably priced energy) as long as the outside temperature suffices for cooling. 3 H,x- directed control The amount of outdoor air and recirculation air are modulated during all periods of time to minimize the amount of mechanical cooling. Calculation is performed on the basis of temperatures and humidity (enthalpy). Maximum Economy Changeover (MECH): Heat recovery is opened whenever exhaust air enthalpy is lower than outdoor air enthalpy, reducing energy demand on active cooling of supply air. 49
Page 1: Building a
Page 4 and 5: 6.3 Services.......................
Page 6 and 7: 1.2 What constitutes energy efficie
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Page 10 and 11: Update existing buildings Short-ter
Page 12 and 13: German industry can make a number o
Page 14 and 15: Example: Supply and prices The grow
Page 16 and 17: Consequences of the EPBD: To meet t
Page 18 and 19: Content of EN 15232 Standard EN1523
Page 20 and 21: 4 The EN 15232 standard in detail E
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Page 24 and 25: Remarks of Siemens This section out
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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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