Influence of the Airflow in a Solar Passive Building on the Indoor Air Quality and Thermal Comfort Levels

Conceição, Eusébio; Gomes, João; Awbi, Hazim

doi:10.3390/atmos10120766

Cited by 25 publications

(14 citation statements)

References 54 publications

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“…Several contributions have been devoted to this issue, focused on natural air exchange, in the recent period [41][42][43][44]. In paper [45], the focus is on air exchange in the summer when considering energy savings.…”

Section: Measurement Of Carbon Dioxide Concentration Valuesmentioning

confidence: 99%

Quantification of Air Change Rate by Selected Methods in a Typical Apartment Building

2021

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An important parameter that affects indoor climate of buildings and also ventilation heat losses and gains is the speed of air change between the outdoor environment and the interior of buildings. Indoor air quality is therefore significantly associated with ventilation. Quantification of air change rate is complicated, because it is impacted by many parameters, the most variable of which is air flow. This study focuses on the determination and comparison of air change rate values in two methods by quantification of the aerodynamic coefficient Cp = Cpe − Cpi, so-called “aerodynamic quantification of the building” and the methodology based on “experimental measurements of carbon dioxide”. The study describes and takes into account the effect of wind, building parameters and air permeability for the building using “aerodynamic quantification of the building”. The paper compares these calculated results with the values obtained from experimental measurements method of carbon dioxide in a selected reference room in apartment building and evaluates the accuracy of the prediction of the air exchange rate obtained by these methods. At higher wind speeds the values of air change rate with considering the effect of openings are closer to the values obtained based on experimental measurements of carbon dioxide and the difference between the values without considering the effect of openings increases significantly.

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Section: Measurement Of Carbon Dioxide Concentration Valuesmentioning

confidence: 99%

Quantification of Air Change Rate by Selected Methods in a Typical Apartment Building

2021

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“…The parameters used to evaluate the long-term thermal comfort conditions are presented in the ISO 7730 standard [23]. Air Quality Uncomfortable Hours and Total Uncomfortable Hours due to thermal and air quality conditions are concepts that were introduced by Conceição et al [33]. This long-term integral model, which aggregates the Warm Un-comfortable Hours, the Cold Uncomfortable Hours, and the Air Quality Uncomfortable Hours, is used to obtain the airflow rate that simultaneously provides the best indoor air quality and thermal comfort levels in an occupied space.…”

Section: Introductionmentioning

confidence: 99%

“…This long-term integral model, which aggregates the Warm Un-comfortable Hours, the Cold Uncomfortable Hours, and the Air Quality Uncomfortable Hours, is used to obtain the airflow rate that simultaneously provides the best indoor air quality and thermal comfort levels in an occupied space. It was applied in a numerical study done in a university library to obtain the optimal airflow rate in winter and summer conditions [33].…”

Section: Introductionmentioning

confidence: 99%

Development of a Double Skin Facade System Applied in a Virtual Occupied Chamber

et al. 2021

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In this study a system constituted by seven double skin facades (DSF), three equipped with venetian blinds and four not equipped with venetian blinds, applied in a virtual chamber, is developed. The project will be carried out in winter conditions, using a numerical model, in transient conditions, and based on energy and mass balance linear integral equations. The energy balance linear integral equations are used to calculate the air temperature inside the DSF and the virtual chamber, the temperature on the venetian blind, the temperature on the inner and outer glass, and the temperature distribution in the surrounding structure of the DSF and virtual chamber. These equations consider the convection, conduction, and radiation phenomena. The heat transfer by convection is calculated by natural, forced, and mixed convection, with dimensionless coefficients. In the radiative exchanges, the incident solar radiation, the absorbed solar radiation, and the transmitted solar radiation are considered. The mass balance linear integral equations are used to calculate the water mass concentration and the contaminants mass concentration. These equations consider the convection and the diffusion phenomena. In this numerical work seven cases studies and three occupation levels are simulated. In each case the influence of the ventilation airflow and the occupation level is analyzed. The total number of thermal and indoor air quality uncomfortable hours are used to evaluate the DSF performance. In accordance with the obtained results, in general, the indoor air quality is acceptable; however, when the number of occupants in the virtual chamber increases, the Predicted Mean Vote index value increases. When the airflow rate increases the total of Uncomfortable Hours decreases and, after a certain value of the airflow rate, it increases. The airflow rate associated with the minimum value of total Uncomfortable Hours increases when the number of occupants increases. The energy production decreases when the airflow increases and the production of energy is higher in DSF with venetian blinds system than in DSF without venetian blinds system.

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“…The energy savings obtained with the application of these systems were analyzed in the works of Chiesa et al [3], Ignjatovic et al [4], Puertolas et al [5], and Ulpiani et al [6]. This work uses a numerical model, developed by the authors over the past twenty years, which is based on a system of energy and mass balance integral equations and works under transient conditions (as example, please see the works of Conceição et al [7], [8], and Conceição and Lúcio [9]). The building geometry is developed by Computing Aid Design and all equations will be established by the numerical software using this geometry.…”

Section: Introductionmentioning

confidence: 99%

Production of thermal energy in University building greenhouses in cold climate conditions

et al. 2021

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The present work focuses on the production of thermal energy in University building greenhouses in cold climate conditions. The building model uses a system of energy and mass balance integral equations, which are solved by the Runge–Kutta–Felberg method with error control. This numerical study is about the thermal behaviour of a university building with complex topology, in winter and transient conditions. The thermal comfort of the occupants, using the Predicted Mean Vote index, and the indoor air quality, using the carbon dioxide concentration, are evaluated. This building has 319 compartments distributed by four floors and it is equipped with one internal greenhouse in the third floor. This greenhouse is located on the south facing facade and the heated air in this space will be transported to compartments located on the north facing façade. The spaces subject to the influence of the heated air coming from the greenhouse improve the level of thermal comfort of its occupants. The level of indoor air quality in occupied spaces is acceptable according to international standards.

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Influence of the Airflow in a Solar Passive Building on the Indoor Air Quality and Thermal Comfort Levels

Cited by 25 publications

References 54 publications

Quantification of Air Change Rate by Selected Methods in a Typical Apartment Building

Quantification of Air Change Rate by Selected Methods in a Typical Apartment Building

Development of a Double Skin Facade System Applied in a Virtual Occupied Chamber

Production of thermal energy in University building greenhouses in cold climate conditions

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