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--- examples:non-residential_buildings:passive_house_swimming_pools [2017/12/13 18:26] – [Heating and electricity consumption] kdreimane
+++ examples:non-residential_buildings:passive_house_swimming_pools [2017/12/13 18:28] – [Ventilation concept] kdreimane
@@ Line 74: / Line 74: @@
 A total of six ventilation units with heating coils in the supply air are located in the basement. Two different types of devices were used. Those for the pool areas are custom-built devices with two cross-flow heat exchangers and one counter-flow heat exchanger connected in series. One of these devices is equipped with a heat pump in order to extract and recover additional energy from the exhaust air (enthalpy recovery). On account of the high quality building envelope it is not necessary to have the dry supply air enter near the facade.\\
-The ventilation technology plays a key role for an energy-optimised indoor swimming pool. Full exploitation of the potential was not possible during the adjustment phase - despite the excellent results already obtained. The humidity in the pool areas can be increased further, and regulation of the devices has to be optimised even more. \\
+The ventilation technology plays a key role for an energy-optimised indoor swimming pool. Full exploitation of the potential was not possible during the adjustment phase - despite the excellent results already obtained. The humidity in the pool areas can be increased further, and regulation of the devices has to be optimised even more.
+[{{ :picopen:luenen_fig5.png?500|**Figure 5: Influence of changes in the humidity levels in the pool halls (left) or air volume flow (right) on the electricity or heat consumption of the ventilation units.**}}]
 The analysis also showed that the total circulating air volume flow of all devices in the indoor pool makes up about 70 % on average of the supply air, with only 30 % outdoor air flow. Only the latter is necessary for dehumidification and air renewal, whilst the circulating air volume flow is only needed to ensure that the air in the halls is sufficiently mixed and distributed. Lower air circulation volumes are viable and imply significant energy savings. This was demonstrated with experiments on air flow in the halls (fog experiments). The ultimate aim of the Passive House concept for indoor swimming pools is operation completely without recirculated air, since this means a considerable reduction in the electricity consumption of the ventilation units.\\
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 Various tests relating to the effect of higher humiditiy in the halls and low circulating air volume flow were carried out during the monitoring. The significant effects on the heating and electricity consumption observed in the baselinse research could thus also be confirmed in practice.\\
-Regulation of the ventilation units takes place based on the setpoint value for indoor air humidity; lower humidity levels require higher outdoor air changes for drying the air, which leads to higher heat consumption. In the course of operation, the set values for humidity levels in the halls were changed for various reasons. On 18.9.12, the humidity in three pool halls was decreased considerably (ca. - 15 percentage points or 4.4 g/kg), which resulted in a substantial increase in the heat consumption (the total for the three halls was ca. + 410 kWh/day). Before this date no supplementary heating via the heating coil was required in the pool area 1+2 since the heat pump of the unit had been sufficient for heating (Fig. 5). The lower humidiy caused in increase of the electricity consumption of the three ventilation units by almost 100 kWh/day. This clearly demonstrates the influence of humidity in the pool areas on the building’s energy consumption. \\
+Regulation of the ventilation units takes place based on the setpoint value for indoor air humidity; lower humidity levels require higher outdoor air changes for drying the air, which leads to higher heat consumption. In the course of operation, the set values for humidity levels in the halls were changed for various reasons. On 18.9.12, the humidity in three pool halls was decreased considerably (ca. - 15 percentage points or 4.4 g/kg), which resulted in a substantial increase in the heat consumption (the total for the three halls was ca. + 410 kWh/day). Before this date no supplementary heating via the heating coil was required in the pool area 1+2 since the heat pump of the unit had been sufficient for heating (Fig. 5). The lower humidiy caused in increase of the electricity consumption of the three ventilation units by almost 100 kWh/day. This clearly demonstrates the influence of humidity in the pool areas on the building’s energy consumption.
-\\
-|{{:picopen:luenen_fig5.png?600|}}|\\
+By means of a fog experiment for visualisation of the indoor air flow it was ascertained that no problems with "dead corners" or air flow through the hall occurred even with considerably decreased supply air volume flows (with identical humidity). For this reason, on 19.12.12 the air quantity was reduced (by 41 %) from the 14 500 m³/h in accordance with VDI 2089 to just 8 500 m³/h in the pool hall 1+2. The electricity consumption fell by around 74 kWh/day with this measure alone (Fig. 5, right). This corresponds to savings of 2200 kWh per month by means of this modification in just one pool hall. This measured data confirms the considerations in the earlier baseline research that by means of intelligent ventilation planning and the resulting reduction in the recirculation air, it is possible to achieve electricity savings without impairing the air quality.
-|//**Figure 5:\\ Influence of changes in the humidity levels in the pool halls (left) or air volume flow (right) on the \\ electricity or heat consumption of the ventilation units.**//|\\
-\\
-By means of a fog experiment for visualisation of the indoor air flow it was ascertained that no problems with "dead corners" or air flow through the hall occurred even with considerably decreased supply air volume flows (with identical humidity). For this reason, on 19.12.12 the air quantity was reduced (by 41 %) from the 14 500 m³/h in accordance with VDI 2089 to just 8 500 m³/h in the pool hall 1+2. The electricity consumption fell by around 74 kWh/day with this measure alone (Fig. 5, right). This corresponds to savings of 2200 kWh per month by means of this modification in just one pool hall. This measured data confirms the considerations in the earlier baseline research that by means of intelligent ventilation planning and the resulting reduction in the recirculation air, it is possible to achieve electricity savings without impairing the air quality. \\
 \\
 ===== Comparison of the measured data with projected energy consumption =====