在过去的几年里，辐射系统作为供暖和制冷系统变得非常普遍。最初用于多层建筑的楼板，在70年代，地板供暖系统增加了应用数量，如今它们在世界各地的市场中占有很大一部分。后来又引入了其他几种系统，最近辐射墙系统也变得非常流行。虽然辐射系统通常是销售和设计的，但似乎不太清楚管道水平面后面发生了什么。事实上，标准只考虑了房间一侧的热容量输出，但感觉是背面的某些东西没有得到正确考虑。此外，当辐射墙系统安装在外墙上时，有时不考虑隔热: 很多时候，辐射系统的投入没有考虑底层结构的U值。本文的目的是比较辐射墙系统和地板系统在相同条件下的保温体积；分析了隔热层在辐射墙中的位置。为此，辐射系统的详细模型（名为DigiThon）已被用于确定冬季设计条件下系统的供热能力以及冬季和夏季辐射系统的季节性能源需求。结果表明，在供暖季节，系统的容量相同，但在制冷季节，系统的容量不同。单位:双引文:ASHRAE交易，第115卷，第。2、路易斯维尔2009

Radiant systems became in the last years very common as heating and cooling system. Originally used in the slabs in multi-storey buildings, during the 70s floor heating systems increased the number of applications and nowadays they represent a big part of the market all over the world.Afterwards several other systems have been introduced and recently radiant wall systems became very popular as well. Although radiant systems are usually sold and designed, it does not appear very clear what behind the pipes level happens. Standards in fact take in consideration only the heating capacity output on the room side, but the feeling is that something on the back side is not taken correctly into account. Moreover, when radiant wall systems are installed on external walls, sometimes no insulation is taken into account: many times radiant systems are put in without taking into account the U-value of substratum structure.The goal of this paper is to compare a radiant wall system and a floor system under the same conditions in terms of insulation volume; also the position of the insulation layer in radiant wall has been analyzed. A detailed model for radiant systems (named DigiThon) has been used for this purpose, for determining both the heating capacity of the systems in winter design conditions and the seasonal energy demand of the radiant systems during winter and summer period. Results show that the capacity of the systems is the same in heating but not in cooling season.Units: Dual