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--- planning:non-residential_passive_house_buildings:passive_house_retail [2018/04/23 15:18] – [Thermal protection] kdreimane
+++ planning:non-residential_passive_house_buildings:passive_house_retail [2018/04/23 15:20] (current) – [Thermal protection] kdreimane
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 ==== Thermal protection ====
+[{{ :picopen:01_pb40_einfuehrung_en_abb.4.png?250|**Figure 4: Display windows of existing buildings often still have single glazing.**}}]
 Like other efficiency measures, thermal protection has played a rather subordinate role in retail stores up till now (see e.g. Figure 4). Not only is it disregarded but sometimes it is even viewed critically: in buildings with sufficiently high internal heating loads, the issue arises whether a good level of thermal protection would be productive all at all, or whether it would be better to deliberately induce the maximum possible transmission losses in order to reduce the cooling demand. \\
 In actual fact, further improvement of the thermal protection is pointless and will lead to an increased cooling demand, at the latest when the internal heat gains meet the maximum heating demand (Figure 5). \\
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-[{{:picopen:01_pb40_einfuehrung_en_abb.4.png?400|**Figure 4: Display windows of existing buildings often still have single glazing.**}}]
-[{{:picopen:01_pb40_einfuehrung_en_abb.5.png?500|**Figure 5: Useful energy demand of a supermarket (similar to Figure 1) for heating and cooling with different internal heat sources.**
+[{{:picopen:01_pb40_einfuehrung_en_abb.5.png?450|**Figure 5: Useful energy demand of a supermarket (similar to Figure 1) for heating and cooling with different internal heat sources.**
 An x-axis value of 0 shows the level of insulation required according to the German EnEV standard. The cooling demand is greater with higher internal loads, more insulation will then be contraproductive. Figure 7 demonstrates that additional natural ventilation in summer can solve this problem.}}]
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 Since internal heat gains are a decisive influencing parameter for the concept of the structural envelope, these will be examined in more detail here. Figure 6 illustrates how great the fluctuations in the heat gains can be in retail stores. \\
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 [{{:picopen:01_pb40_einfuehrung_en_abb.6.png?500|**Figure 6: Variation range of the internal heat gains. TK = deep freezing, NK = Normal cooling**}}]
-[{{:picopen:01_pb40_einfuehrung_en_abb.7.png?500|**Figure 7: As in Figure 5, but with an additional air change rate of 3 h<sup>-1</sup> for space cooling.**}}]
+[{{:picopen:01_pb40_einfuehrung_en_abb.7.png?550|**Figure 7: As in Figure 5, but with an additional air change rate of 3 h<sup>-1</sup> for space cooling.**}}]
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