Ventilation systems are necessary to ensure a good indoor air quality, especially in buildings characterized by high energy performance. An all-air system could be more flexible than radiant systems that need to be combined with other systems to provide fresh air and control latent loads. In this work, a multi-zone all-air system has been compared with a radiant floor integrated with mechanical controlled ventilation and an isothermal dehumidifier. All the systems have been modeled in TRNSYS considering a residential building and three different locations (Helsinki, Milan and Rome). The comparison has been performed in terms of both indoor conditions and energy consumption. The results outline that the two systems are able to maintain the desired indoor conditions. For the energy consumption, an air-to-water heat pump and all the auxiliaries have been considered. Under the same indoor conditions, in heating the electrical energy consumption of the all-air system is lower than that of the radiant floor (−19% in Helsinki, −32% in Milan and −74% in Rome); also in cooling the electrical energy consumed by the all-air system is lower in Milan and Rome (−14% and −29% respectively), whereas in Helsinki the difference is less than 5%.

必须使用通风系统以确保良好的室内空气质量，特别是在以高能效为特征的建筑物中。全空气系统比需要与其他系统结合以提供新鲜空气和控制潜在负荷的辐射系统更加灵活。在这项工作中，将多区域全空气系统与集成了机械控制通风和等温除湿机的辐射地板进行了比较。考虑到一栋居民楼和三个不同的地点（赫尔辛基，米兰和罗马），所有系统都在TRNSYS中建模。已经根据室内条件和能耗进行了比较。结果概述了这两个系统能够维持所需的室内条件。对于能源消耗，空气-水热泵和所有辅助设备均已考虑在内。在相同的室内条件下，全热系统的供暖能耗要低于辐射地板的能耗（赫尔辛基为-19％，米兰为-32％，罗马为-74％）；在制冷方面，米兰和罗马的全空气系统所消耗的电能也较低（分别为−14％和−29％），而在赫尔辛基，相差不到5％。