Temperature profile of fire-induced smoke in node area of a full-scale mine shaft tunnel under natural ventilation

A solar chimney is a natural ventilation technique that has a potential to save energy consumption as well as to maintain the air quality in the building. However, studies of buildings are often challenging due to their large sizes. The objective of the current study was to determine relationships between small- and full-scale solar chimney system models. In the current work, computational fluid dynamics (CFD) was utilized to model different building sizes with a solar chimney system, where the computational model was validated with the experimental study of Mathur et al. The window, which controls entrainment of ambient air, was also studied to determine the effects of window position. Correlations for average velocity ratio and non-dimensional temperature were consistent regardless of window position. Buckingham pi theorem was employed to further non-dimensionalize the important variables. Regression analysis was conducted to develop a mathematical model to predict a relationship among all of the variables, where the model agreed well with simulation results with an error of 2.33%. The study demonstrated that the flow and thermal conditions in larger buildings can be predicted from the small-scale model.

Download Full-text

Curtain Wall with Solar Preheating of Ventilation Air. Full Scale Experimental Assessment

E3S Web of Conferences ◽

10.1051/e3sconf/202017209007 ◽

2020 ◽

Vol 172 ◽

pp. 09007

Author(s):

Roberto Garay-Martinez ◽

Beñat Arregi

Keyword(s):

Natural Ventilation ◽

Integrated Control ◽

Substantial Reduction ◽

Systems Design ◽

Full Scale ◽

Curtain Wall ◽

Smart Control ◽

Scale Experiment ◽

Ventilated Facade ◽

Ventilation Systems

Heating load in Commercial buildings is highly related with ventilation systems, while at the same time local discomfort in the vicinity of glass walls occurs due to overheating. In this paper, a novel double envelope curtain wall is presented, which extracts heat from the façade by means of a ventilated cavity which is then incorporated to the ventilation air intake. A substantial reduction of heating loads is achieved. Whenever solar gains are not sought, a bypass element allows the natural ventilation of this air cavity, acting as a ventilated façade. An integrated control system with embedded electronics and actuators allows for a smart control of the system. The system is designed for integration with existing rooftop ventilation systems. Design considerations are discussed, and the outcomes of a full-scale experiment conducted in Bilbao (Spain) along 2019 presented.

Download Full-text

STUDY ON ANNUAL CHANGE OF PASSIVE VENTILATION FUNCTIONS OF "BREATHING ARCHITECTURAL COMPONENT" BASED UPON A FIELD EXPERIMENT USING A FULL-SCALE MOCK-UP : Study on properties of natural ventilation, thermal insulation and vapor transmission in a breathing architectural component Part 3

Journal of Environmental Engineering (Transactions of AIJ) ◽

10.3130/aije.71.13 ◽

2006 ◽

Vol 71 (600) ◽

pp. 13-20 ◽

Cited By ~ 1

Author(s):

Chungil PARK ◽

Akira HOYANO ◽

Seonghwan YOON

Keyword(s):

Field Experiment ◽

Thermal Insulation ◽

Natural Ventilation ◽

Full Scale ◽

Component Part ◽

Annual Change

Download Full-text

Performance analysis of a new system for night cooling of buildings on a full scale office room - CFD study

Journal of Physics Conference Series ◽

10.1088/1742-6596/2116/1/012106 ◽

2021 ◽

Vol 2116 (1) ◽

pp. 012106

Author(s):

M Lança ◽

P J Coelho ◽

J Viegas

Keyword(s):

Natural Ventilation ◽

Concrete Slab ◽

Full Scale ◽

Energy Saving Potential ◽

Air Supply ◽

New Type ◽

Computational Fluid Dynamics Cfd ◽

The Difference ◽

Night Ventilation ◽

Indoor Conditions

Abstract Night natural ventilation systems have been receiving increased attention in recent years because of their energy saving potential and environmental protection when used in passive instead of active cooling. A recently proposed novel system for cooling the building concrete slab is studied numerically in the present work. It consists of a new type of a Suspended Ceiling (SC) with a peripheral gap between it and the walls, combined with the positioning of the air supply and extraction grilles between the ceiling slab and the SC. The system relies only on night ventilation as a means for cooling down the structure of the building. This study focuses on the use of Computational Fluid Dynamics (CFD) to predict the airflow and thermal performance of this strategy and it is applied to a full scale office room. The calculations show that a SC with a gap can reduce the difference between the average temperatures at the end of the heating and the end of the cooling periods by 25% compared with the case of a full covered slab room scenario (tight SC). CFD proved to be a useful and accurate tool to predict indoor conditions in buildings.

Download Full-text