Airflow pattern and performance of attached ventilation for two types of tiny spaces

With the emergence of urban sentry boxes and capsule hotels, the development of tiny spaces with the concept of a reasonable minimum occupied space has attracted widespread attention from society. The ventilation mode that fits with the limited geometric characteristics of tiny spaces is worth exploring. Combined with the respective ventilation requirements of two types of tiny spaces, i.e., sentry box space and tiny sleeping space, this paper proposes two attached ventilation modes. A full-scale experiment cabin was established, and the simulation method was optimized through experimental data. The airflow pattern and distribution performance of the two attached ventilation modes in two types of tiny spaces were studied by the CFD method. The results showed that the airflow attached to the vertical wall could form an air curtain at the opening windows of the sentry box space, but there is a phenomenon of air leakage. The installation of the deflector can improve the integrity of the air curtain, and the best installation angle of the deflector is 60 degrees. The double side-attached ventilation mode in the tiny sleeping space can not only relieve the draught of the occupants (DR < 15%), but also firstly deliver fresh air to the occupied zone (expiratory zone MAA < 92 s). The research conclusions will add new ideas to the diversity of ventilation modes in tiny spaces.