scholarly journals Numerical simulations for the optimisation of ventilation system designed for wine cellars

2019 ◽  
Vol 50 (4) ◽  
pp. 180-190 ◽  
Author(s):  
Enrica Santolini ◽  
Alberto Barbaresi ◽  
Daniele Torreggiani ◽  
Patrizia Tassinari
Keyword(s):  
Natural Ventilation ◽  
Ventilation System ◽  
Climatic Conditions ◽  
Mold Growth ◽  
Critical Factors ◽  
Air Velocity ◽  
Wine Production ◽  
First Case ◽  
Dynamics Modelling ◽  
Optimal Configurations

The wine-ageing process is one of the most important phases of the wine production and it can be considerably affected by the micro-climatic conditions inside the ageing rooms. Underground wine cellars in small-medium wineries are designed with natural ventilation systems, able to maintain optimal indoor condition. However, critical factors emerge, such as mold growth or wine evapo-transpiration, where ventilation proved to be poorly designed, insufficient in the first case or excessive in the second one. The zones around the wooden barrels proved to be the most sensitive and problematic. These areas are the most investigated in terms of temperature and humidity values but surprisingly not in terms of air velocity. In this paper, a ventilation system has been designed and optimised to support the lack of ventilation, by means of computational fluid dynamics modelling. Eight configurations have been performed and analysed, identifying the best two according to the air velocity range. Specific parameters have been defined to appreciate the application limits of each configuration. These parameters can be used as reference for system design in similar studies and applications and can help scholars and professionals to identify the optimal configurations for the implementation and proper placement of the system inside a cellar.

scholarly journals Optimizing air velocity for the underfloor forced ventilation to protect a refrigerated warehouse from frost heaving

2018 ◽  
Vol 38 (3) ◽  
pp. 321-327
Author(s):  
Jingfu Jia ◽  
Manjin Hao ◽  
Jianhua Zhao
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Natural Ventilation ◽  
Ventilation System ◽  
Three Dimensional ◽  
Temperature Fields ◽  
Frost Heave ◽  
Forced Ventilation ◽  
Air Velocity ◽  
Set Up

Forced or natural ventilation is the most common measure of frost heave protection for refrigerated warehouse floor. To optimize air velocity for the underfloor forced ventilation system of refrigerated warehouse, a steady state three-dimensional mathematical model of heat transfer is set up in this paper. The temperature fields of this system are simulated and calculated by CFD software PHOENICS under different air velocity, 1.5m/s, 2.5m/s or 3.5m/s. The results show that the optimized air velocity is 1.5m/s when the tube spacing is 1.5m.

scholarly journals Influence of Wind on Air Movement in a Free-Stall Barn During the Summer Period / Wpływ wiatru na ruch powietrza w oborze wolnostanowiskowej w okresie letnim

2013 ◽  
Vol 13 (1) ◽  
pp. 109-119 ◽  
Author(s):  
Piotr Herbut ◽  
Sabina Angrecka ◽  
Grzegorz Nawalany
Keyword(s):  
Natural Ventilation ◽  
Air Flow ◽  
Ventilation System ◽  
Air Velocity ◽  
Summer Period ◽  
Air Masses ◽  
Air Movement ◽  
Microclimatic Conditions ◽  
Hot Weather ◽  
Different Levels

Abstract Use of natural ventilation in the barn should lead to optimal microclimatic conditions over the entire space. In the summer, especially during hot weather, higher air velocity cools cows, which helps to avoid heat stress. The paper presents the results of studies on the evolution of air movement in a modernized free-stall barn of the Fermbet type with the natural ventilation system during the summer period. Based on measurements of velocity and direction of air flow (inside and outside the barn) and observations of smoke indicator, the movement of air masses in different parts of the barn was identified. Significant variations of air flow at different levels of the barn were found. These differences deviate from the accepted patterns of natural ventilation, which can be found in the literature. The range of a draught and stagnant air along with the conditions in which they are built was determined. On this basis, recommendations regarding the location of barns on the plots and the improvement of ventilation in summer were made.

scholarly journals Optimization Of Natural Ventilation In Building As Passive Design Strategy For Health Security

2020 ◽  
Vol 1 (1) ◽  
pp. 25-31
Author(s):  
Cynthia Permata Dewi
Keyword(s):  
Natural Ventilation ◽  
Ventilation System ◽  
Electrical Energy ◽  
Living Room ◽  
Ventilation Strategy ◽  
Minimum Level ◽  
Air Velocity ◽  
Health Security ◽  
Sliding Windows ◽  
Air Movement

The use of natural ventilation strategy in a building is currently encouraged by the emergence of a pandemic Covid-19. In addition to its advantages in minimizing the use of electrical energy, the natural ventilation system is believed could reduce the possibility of spreading the virus. One design approach to this system is by using the window's design properly. Air movement inside a building should be utilized well to allow the movement from inlet to outlet. The position of the window was one of the variables examined in this study besides the types of the window. This study found that the use of a combination of 300 awnings produced the highest airspeed in the living room (R1), while a combination of horizontal sliding windows resulted in the highest air velocity in the bedroom (R2). Still, the airspeed generated from the two combinations less than the minimum level of it is generally required, 0.75 – 0.9 m/s.

scholarly journals Transition from n50 to actual air exchange dependent on climatic conditions

2019 ◽  
Vol 282 ◽  
pp. 02101
Author(s):  
Tomasz Kisilewicz ◽  
Katarzyna Nowak-Dzieszko ◽  
Małgorzata Rojewska-Warchał
Keyword(s):  
Energy Demand ◽  
Natural Ventilation ◽  
Simple Procedure ◽  
Ventilation System ◽  
Climatic Conditions ◽  
Model Calculations ◽  
Change Rate ◽  
The Real ◽  
Air Change Rate ◽  
Air Exchange

The knowledge of the air flow and air exchange in the building is critical both on the design and operation stage of the building. Infiltration of air interferes with the mechanical ventilation and determines the proper functioning of the natural ventilation system, still commonly used in the standard buildings. The building airtightness can be described by n50 parameter, however it does not specify the real air exchange in natural conditions. According to the simple procedure of the standard EN ISO 13789, factor n50 may be easily converted to the monthly averaged air change rate. However, it is difficult to accept the same value of air change rate in any month of a year, as it is often done in the certification procedures. More precise, climate dependent conversion procedures have been elaborated in USA, but they were developed for the specific local building technology and local climate conditions. This paper presents the results of the preliminary measurements conducted in a single family house in Poland, built in a heavy-weight technology. The real air exchange rate was measured in various climatic conditions by means of gas tracing method, with CO2 as the tracer gas, in order to prove a relationship between the enhanced procedure and the external conditions. Acceptable agreement between the results of the measurement and model calculations was obtained. Based on the preliminary results, the authors determined the more realistic influence of the enhanced algorithm on the ventilation energy demand. The use of the simplified model resulted in case of the analyzed object in 15% overestimation of the ventilation thermal losses.

EFFECT OF BUILDING PLAN FORM ON HUMAN THERMAL COMFORT IN NATURALLY VENTILATED OPEN-PLAN ENCLOSURES LOCATED IN HOT CLIMATES

2017 ◽  
Vol 12 (2) ◽  
pp. 112-129 ◽  
Author(s):  
Omar S. Asfour
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Weighted Average ◽  
Climatic Conditions ◽  
Air Velocity ◽  
Human Thermal Comfort ◽  
Velocity Magnitude ◽  
Open Plan ◽  
Ventilation Performance ◽  
Common Observation

This study aims to examine the effect of building plan form on internal thermal comfort conditions in naturally ventilated open-plan buildings located in hot climates. The study examined the square and the rectangular plan forms in relation to several values of wind direction, building plan depth, and climatic conditions. The study utilised CFD for ventilation prediction, DesignBuilder for thermal modelling, and the Tropical Summer Index (TSI) for thermal comfort assessment. These three tools were integrated in a quantitative approach to fulfil the study aim. The study concluded that the use of area-weighted average velocity magnitude is more accurate in the assessment of natural ventilation performance, as it accounts for both internal velocity magnitude and distribution. The study confirmed the common observation that the use of shallow building plans is more effective to increase internal air velocity and improve internal thermal comfort. At some point of increased plan depth, the internal air velocity magnitude dramatically decreases. In the three examined wind directions, this occurred when the plan depth exceeded 3H in the square cases and 2.5H in the rectangular ones, where H is the building height. This value is much less than the commonly recommended maximum value of 5H. The study also concluded that reducing building depth in the square cases has generally more potential to improve thermal comfort conditions when compared with the rectangular cases. The gross increase in Percentage of People Comfortable, PPC, in all the examined cases was 23% in the square cases, compared to 11% in the rectangular cases.

scholarly journals COVID-19 Desertion – Investigating Mold Potentials before Office Re-Entry

2021 ◽  
pp. 1-8
Author(s):  
Kennedy A. Osakwe ◽  
Folusho E. Alamina
Keyword(s):  
Relative Humidity ◽  
Analytical Study ◽  
High Efficiency ◽  
Ventilation System ◽  
Mold Growth ◽  
Air Velocity ◽  
Physico Chemical ◽  
Risk Of Exposure ◽  
Poor Ventilation ◽  
Rule Out

Background: While workers and organisations heeded lockdown enforcements and abandoned offices in response to COVID-19 pandemic, the potential for mold growth thrived in unoccupied offices. An investigative enquiry to assess the potential and risk of exposure to mold is a sine-qua-non to safe re-entry to offices. Materials and Method: An analytical study conducted through walk through survey involving visual inspection, measurement of physico-chemical parameters (Temperature, Relative Humidity, Air Velocity and Particulate Matters PM2.5); collection and analysis of suspected swab and bulk samples. Results: Results showed copious amount of moisture evidenced by an averagely high relative humidity of 94%, low ambient temperature of 16% and poor ventilation evinced by an air velocity of 0.4 metre per second. Analysis of samples Mucor species revealed (Mucor mucedo, Mucor himalis, Mucor racemosus); Aspergillus species (Aspergillus flavus, Aspergillus fumigatus and Aspergillus terrus); Cladosporium species (Cladosporium cladosproides and Cladosporium sphaerosperum). Conclusion: Poor ventilation, deposits of debris, increased moisture and dysfunctional ventilation system as found in abandoned offices for Mold growth. Post lockdown re-entry to offices should be preceded by Mold risk assessment among other measures to rule out the presence of Mold growth. Preparations for re-entry should include deep cleaning with anti Mold agents, optimization of ventilation system using anti Mold and High Efficiency Particulate Absorbing (HEPA) filters, dehumidifiers and safe remediation of suspected mold growth using suitable personal protective equipment.

Use of Natural Ventilation in Malaysia's Future Green Housing

2014 ◽  
Vol 935 ◽  
pp. 316-319
Author(s):  
Alireza Gharakhani ◽  
Eka Sediadi ◽  
Tareef Hayat Khan ◽  
Hadi Bagheri Sabzevar
Keyword(s):  
Solar Energy ◽  
Natural Ventilation ◽  
Residential Buildings ◽  
Renewable Energy Sources ◽  
Ventilation System ◽  
Electricity Consumption ◽  
Green Building ◽  
Climatic Conditions ◽  
Simulation Software ◽  
Asia Pacific

Within the Asia Pacific region, Malaysias WAWASAN 2020 creates the vision of being a green country. Accordingly, the Malaysian Government has established the mission of reducing the carbon emission. The programs include the projects targeting the energy efficiency and saving within the housing and residential buildings that must meet the Green Building criteria to achieve the sustainable architectural design. Renewable energy sources, like wind or solar energy, can be used to ventilate. The review of previous researchers shows that the use of the natural ventilation system decreases the electricity consumption of a simulated housing in the hot and humid climatic conditions such as Malaysia. The purpose of this research is a review of consumes renewable energies such as solar energy and wind for passive cooling. To test the benefit of natural ventilation system, this paper reviewed some analysis that had used simulation software such as CFD.

Investigation of the natural ventilation of wind catchers with different geometries in arid region houses

2020 ◽  
Vol 14 (3) ◽  
pp. 7109-7124
Author(s):  
Nasreddine Sakhri ◽  
Younes Menni ◽  
Houari Ameur ◽  
Ali J. Chamkha ◽  
Noureddine Kaid ◽  
...  
Keyword(s):  
Arid Region ◽  
Natural Ventilation ◽  
Reduction Rate ◽  
Internal Flow ◽  
Climatic Conditions ◽  
Maximum Pressure ◽  
Ventilation Technique ◽  
Window Position ◽  
The One ◽  
Flow Velocities

The wind catcher or wind tower is a natural ventilation technique that has been employed in the Middle East region and still until nowadays. The present paper aims to study the effect of the one-sided position of a wind catcher device against the ventilated space or building geometry and its natural ventilation performance. Four models based on the traditional design of a one-sided wind catcher are studied and compared. The study is achieved under the climatic conditions of the South-west of Algeria (arid region). The obtained results showed that the front and Takhtabush’s models were able to create the maximum pressure difference (ΔP) between the windward and leeward of the tower-house system. Internal airflow velocities increased with the increase of wind speed in all studied models. For example, at Vwind = 2 m/s, the internal flow velocities were 1.7, 1.8, 1.3, and 2.5 m/s for model 1, 2, 3, and 4, respectively. However, at Vwind = 6 m/s, the internal flow velocities were 5.6, 5.5, 2.5, and 7 m/s for model 1, 2, 3, and 4, respectively. The higher internal airflow velocities are given by Takhtabush, traditional, front and middle tower models, respectively, with a reduction rate between the tower outlet and occupied space by 72, 42, 36, and 33% for the middle tower, Takhtabush, traditional tower, and the front model tower, respectively. This reduction is due to the due to internal flow resistance. The third part of the study investigates the effect of window (exist opening) position on the opposite wall. The upper, middle and lower window positions are studied and compared. The air stagnation or recirculation zone inside the ventilated space reduced from 55% with the lower window to 46% for the middle window and reached 35% for the upper window position. The Front and Takhtabush models for the one-sided wind catcher with an upper window position are highly recommended for the wind-driven natural ventilation in residential houses that are located in arid regions.

Potential of Selected Indian Herbs for COVID-19

2020 ◽  
Vol 06 ◽  
Author(s):  
Ravindra Verma ◽  
Vaibhav Misra ◽  
Dileep Tiwari ◽  
Prakash S. Bisen
Keyword(s):  
Risk Factors ◽  
Withania Somnifera ◽  
Epidemiologic Studies ◽  
Climatic Conditions ◽  
Tinospora Cordifolia ◽  
Environmental Threats ◽  
Scientific Databases ◽  
First Case ◽  
Ocimum Tenuiflorum ◽  
Novel Coronavirus

Introduction: Many environmental risk factors are associated with some form of chronic inflammation. The spread of COVID-19 across the world has impacted every one of us. The first case of coronavirus was reported on 30 January 2020 in India originating from China. Study Area: India has a tremendous capacity to deal with the coronavirus outbreak because of its high immunity and climatic conditions. Maintaining social distancing and hand washing is not a sufficient step for preventing COVID-19. Indian system of traditional medicine has a potential worth to enhance immunity, which can resist a novel coronavirus. Material & Methods: A detailed study was carried out by analyzing national and international scientific databases (PubMed, SciFinder, ScienceDirect, Scopus, and Web of Science, Mendeley), thesis, and recognized books. Only Indian herbs with high immunity resistant power were analyzed. Epidemiologic studies with information on COVID-19 risk factors and precautions also considered for study purposes. Results: Some herbs like Ocimum tenuiflorum (Tulsi), Glycyrrhiza glabra (Liquorice), Curcuma domestica Vahl (Turmeric), Tinospora cordifolia (Giloy), Withania somnifera (Ashwagandha), Cinnamon (Dalchini), Shoot of Triticumaestivum Linn. (Wheatgrass), Andrographis paniculata (Kalmegh), can help in boosting immunity for COVID-19 disease. Discussion: Despite the shreds of evidence for the efficacy of these herbs in treating coronavirus induced infections; the proper dose with ideal timing for such interventions needs to verify in clinical trials. Researchers must have to take the privilege to explore the potential of herbs to reduce such epidemics of environmental threats.

scholarly journals Review of Intelligent Control Systems for Natural Ventilation as Passive Cooling Strategy for UK Buildings and Similar Climatic Conditions

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4388
Author(s):  
Esmail Mahmoudi Saber ◽  
Issa Chaer ◽  
Aaron Gillich ◽  
Bukola Grace Ekpeti
Keyword(s):  
Control Systems ◽  
Natural Ventilation ◽  
Energy Use ◽  
Integrated Control ◽  
Climatic Conditions ◽  
Effective Control ◽  
Practical Implementation ◽  
Optimal Output ◽  
Heating And Cooling ◽  
Building Cooling

Natural ventilation is gaining more attention from architects and engineers as an alternative way of cooling and ventilating indoor spaces. Based on building types, it could save between 13 and 40% of the building cooling energy use. However, this needs to be implemented and operated with a well-designed and integrated control system to avoid triggering discomfort for occupants. This paper seeks to review, discuss, and contribute to existing knowledge on the application of control systems and optimisation theories of naturally ventilated buildings to produce the best performance. The study finally presents an outstanding theoretical context and practical implementation for researchers seeking to explore the use of intelligent controls for optimal output in the pursuit to help solve intricate control problems in the building industry and suggests advanced control systems such as fuzzy logic control as an effective control strategy for an integrated control of ventilation, heating and cooling systems.

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