How thick must the installation of the pipework in a solar system be? There is a lot of disagreement on this question in the industry. For thermosiphon systems some manufacturers do without any insulation at all. With pumped systems 10,13 or 19mm of insulation are often used (table 1). The relevant question is whether the heat losses from the pipework are significant and the additional cost of insulation can therefore be justified. Roland Baumann, Managing Director of Aeroline Tube Systems Baumann GmbH from Germany, is one of the proponents of better insulation. He believes that good insulation pays for itself within two to three years through the reduction in heat losses. Special requirements apply to the German market, where the regulations on saving energy (Energie-einsparverordnung, EnEV) require a minimum insulation thickness. At the beginning of this year an expert committee from the responsible government ministers for construction made it clear that these minimum requirements also apply to the pipes between the solar collectors and the heat-storage tanks. For the commonly used pipes of up to 22 mm diameter, the EnEV prescribes a minimum insulation thickness of 20 mm for material with a thermal conductance of 0.035 W/mK. Since the EPDM synthetic rubberthat is usually used has a higher conductance than this, the EnEV requires that the insulating thickness of this material is suitably increased.
展开▼
机译：太阳能系统中的管道安装必须有多厚？业界在这个问题上有很多分歧。对于热虹吸系统，一些制造商根本没有任何绝缘。对于抽水系统，通常使用10,13或19mm的绝缘（表1）。相关的问题是管道的热损失是否显着，因此可以证明额外的隔热成本。德国航空管系统公司Baumann GmbH的常务董事Roland Baumann是更好的隔热材料的拥护者之一。他认为，良好的隔热材料可通过减少热量损失在两到三年内收回成本。特殊要求适用于德国市场，在该市场上，有关节能的法规（Energie-einsparverordnung，EnEV）要求最小的绝缘厚度。今年年初，负责政府建设的部长组成的专家委员会明确表示，这些最低要求也适用于太阳能收集器和储热罐之间的管道。对于直径最大为22 mm的常用管道，EnEV规定导热系数为0.035 W / mK的材料的最小绝缘厚度为20 mm。由于通常使用的EPDM合成橡胶具有更高的电导率，因此EnEV要求适当增加该材料的绝缘厚度。
展开▼
