Effects of the radiant heating system location on both the airflow and ventilation efficiency in a room

Abstract

The effect of temperature of the heating system elements is a parameter that could affect the airflow in terms of buoyancy and thermal comfort and that should be studied to ensure the quality of ventilation. This study aimed to assess the air change efficiency and thermal comfort with three thermal conditioning systems (radiators, underfloor heating and radiant ceiling) in winter conditions, varying its position in the interior space. This can be used by architects and engineers when planning the position of the heating systems or refurbishing a room. The experimental analysis was developed in the test chamber of the Laboratory of Ventilation of the University of Valladolid, serving as validation of multiple CFD simulations. The results show that, being the thermal comfort achieved, the mean air change efficiency varied only 2.40% among all cases, which makes this factor not significant. Even so, the trajectory of the airflow in the premise would be affected by the thermal action, due to the convective effect, presenting great differences according to the location of the thermal systems. Thus, the air trajectory could falter when it enters the room or rise towards the ceiling creating areas with lower temperature in its centre.

Impact of door opening on the risk of surgical site infections in an operating room with mixing ventilation

“…The Realizable k-ε model has been commonly used in the literature to simulate indoor ventilation airflow. 36,37 The governing equations can be written in the general form of a transport equation, equation (1), which consists of a transient term, a convection term, a diffusion term and a source term: where ρ is the air density, V is the air velocity vector, ϕ denotes the transported quantity, normalΓϕ is the (effective) diffusion coefficient of ϕ and Sϕ is the source term.…”

Simulation of hybrid GSHP systems utilizing radiant ceiling terminal and system evaluation with analytic hierarchy process method

“…17 Effects of the radiant system location on both the air change efficiency and thermal comfort have been studied. 18 The design of radiant cooling panels with different aspect ratio, serpentine flow architecture has been studied, and the design toward compactness is a way to increase the ratio of cooling capacity over pumping power. 19 An improved system for enhancing the air flow disturbance to increase heat transfer between the aluminium sheets and cooling panels has been suggested, which reduces system capital cost by using less pipe materials.…”

Multizone modelling of a hybrid ventilated high-rise building based on full-scale measurements for predictive control

“…5 Building ventilation is also an effective approach for removing indoor containments and improving indoor air quality (IAQ) [6][7][8][9] and thermal comfort. 10,11 Because of these merits, hybrid ventilation has been widely studied and applied in different types of buildings in the world. Antvorskov 12 introduced hybrid ventilation systems for residential buildings in European Union (EU) with possible integration of renewable energy solutions.…”

“…5 Building ventilation is also an effective approach for removing indoor containments and improving indoor air quality (IAQ) 6–9 and thermal comfort. 10,11…”