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首页> 外文会议>eceee summer study on energy efficiency >Some basic insight about the cost optimal opaque thermal insulation in buildings without overheating or cooling (e.g. transalpine Europe)
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Some basic insight about the cost optimal opaque thermal insulation in buildings without overheating or cooling (e.g. transalpine Europe)

机译：关于建筑物成本最佳的不透明隔热材料的基本知识，而无需过热或冷却（例如Transalpine Europe）

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In the pursuit of nearly zero energy buildings, it appears a widely held belief that technological progress and cost reductions due to large-scale application will allow to achieve in an economic manner new buildings (or new building elements) with an extremely low energy demand (similar to so-called passive houses). This often results in very ambitious roadmaps, including scenarios for deep renovation of the building stock. This hypothesis seems to materialize for major aspects such as heat generators (highly efficient condensing boilers), efficient ventilation systems and good envelope air tightness. However, cost optimal calculations performed in all EU member states usually result in economic thermal transmittances much higher than those typically found in passive houses (e.g. by a factor of 2). The paper first derives the simple analytical formulas that provide a clear understanding of the different factors that influence the cost optimal insulation thickness. They are applicable to buildings that are not subject to meaningful overheating and/or do not need active cooling (such as most dwellings in transalpine Europe). They can be useful for setting requirements in public regulations. The paper then illustrates in a graphical manner the influence on the economic optimum of several variables, such as the initial minimum cost of insulation, the marginal cost of extra thickness, the energy price and the upgrading of an already semi-insulated component. Among other things, the analysis shows that when components are (initially or during renovation) insulated, the full cost optimal insulation level should be achieved at once, because later retrofitting of suboptimal insulation usually becomes uneconomical. Finally, the paper illustrates that it seems unlikely that typical passive house insulation levels will ever be effective from a strictly economic point of view, even if energy prices were to double or triple compared to current levels.
机译：在追求接近零能耗的建筑时，人们普遍认为，由于大规模应用而带来的技术进步和成本降低将允许以经济的方式实现能耗极低的新建筑（或新建筑构件）（类似于所谓的被动式房屋）。这通常会导致制定雄心勃勃的路线图，其中包括对建筑材料进行深度翻新的方案。该假设似乎在诸如热发生器（高效冷凝锅炉），高效通风系统和良好的外壳气密性等主要方面得以实现。但是，在所有欧盟成员国中进行的成本优化计算通常会导致经济上的热传输率比被动式房屋中的热传输率高得多（例如，提高2倍）。本文首先得出简单的分析公式，可以清楚地了解影响成本最佳绝缘厚度的不同因素。它们适用于不会发生明显过热和/或不需要主动冷却的建筑物（例如，欧洲跨阿尔卑斯山脉的大多数住宅）。它们对于在公共法规中设置要求很有用。然后，本文以图形方式说明了几个变量对经济最优的影响，例如初始的最小绝缘成本，额外厚度的边际成本，能源价格以及已经半绝缘的组件的升级。分析显示，除其他事项外，当组件（最初或在翻新过程中）进行绝缘时，应立即达到全部成本的最佳绝缘水平，因为随后进行次优绝缘的改造通常会变得不经济。最后，该论文说明，从严格的经济角度来看，即使被动能源价格与当前水平相比翻了一番或三倍，典型的被动式房屋绝热水平似乎也不会奏效。

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