Numerical and experimental performance analysis of a four-sided wind tower adjoining parlor and courtyard at different wind incident angles

Mohamadabadi, Hossein Dehghani; Dehghan, Ali Akbar; Ghanbaran, Abdulhamid; Movahedi, Alireza; Mohamadabadi, Abolfazl Dehghani

doi:10.1016/j.enbuild.2018.05.006

Cited by 33 publications

(14 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results showed that wind-catcher was able to reduce inside house temperature by 3.2 C. Varela-Boydo and Moya 22 highlighted the importance of wind-catcher inlet compared to the outlet position. Dehghani et al 23 conducted a numerical and experimental investigation on four-sided wind-catcher performance. The results showed that inside houses thermal comfort can be improved even with the presence of low-speed winds using this technique.…”

Section: Wind Catchersmentioning

confidence: 99%

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

et al. 2020

View full text Add to dashboard Cite

Summary Thermal comfort is one of the ancient‐new challenges of the arid region population and responsible for more than 40% of energy end‐use. Renewable energy can be a solution to this problem. In the present paper, the potential of renewable energies to ameliorate thermal comfort and reducing energy consumption in building sectors is experimentally investigated. Three renewable‐based applications are used: wind‐catcher (WC), solar chimney (SC), and earth to air heat exchanger (EAHE). The three techniques are connected to a real‐scale test room and investigated using in‐situ measurement. The contribution of each technique is discussed separately. Temperature, humidity sensors, and anemometer are used to study parameters affecting thermal comfort. Obtained results show that the use of wind‐catcher could provide in the presence of wind an internal airflow of 3.8 m.s−1 which reduces inside room temperature by 6°C. A solar chimney creates a difference between its inlet and outlet air temperature by 5.9°C and increases the kinetic energy of hot air leaving the solar chimney which is replaced by cool air from outside and other devices outlet (EAHE and WC) and increases internal airflow even with the absence of winds. The earth to air heat exchanger increases the outlet air temperature in winter by 8°C and reduces it by 12°C in summer. Inside test room hygrometry is also ameliorated by the use of EAHE. Analyzing the new system (test room + WC + SC + EAHE) shows an important amelioration of inside thermal comfort. A difference between inside and outside test room temperature is found: reduction of 13°C in summer, and a gain of 10°C in winter. The new system leads to better inside test room thermal comfort conditions and to reduce energy consumption by almost 50%. The present study presents the first experimental investigation of using three renewable energies in the same building to improve thermal comfort. Using real scale room and in‐situ measurement gives a realistic idea and results show that green energy could improve the thermal situation and energy saving. This is an original work to motivate building designers, especially in the arid region to use more than one renewable energy to ameliorate thermal comfort in both summer and winter seasons.

show abstract

Section: Wind Catchersmentioning

confidence: 99%

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Computational fluid dynamics (CFD) is a simulation method that has frequently been applied to investigate ventilation mechanisms on the building scale and, sometimes, on the urban scale [5,24,25]. Quite a few commercial software packages allow for an approximation of the solution to the Navier-Stokes equations that describe the physical behavior of air at low speeds [26], including ANSYS Fluent [27][28][29], CONTAMW [30], OpenFOAM [31], Autodesk CFD, and others. Among them, Autodesk CFD has been adopted and validated in several building-and urban-scale natural ventilation Energies 2019, 12, 1042 7 of 29 studies [27,[32][33][34][35].…”

Section: Cfd Simulationmentioning

confidence: 99%

The Effects of Courtyards on the Thermal Performance of a Vernacular House in a Hot-Summer and Cold-Winter Climate

Hao

et al. 2019

Energies

View full text Add to dashboard Cite

Achieving comfort in hot summer and cold winter (HSCW) climate zones can be challenging, since the climate is characterized by high temperatures in the summer and relatively colder temperatures in the winter. Courtyards, along with other semi-open spaces such as verandas and overhangs, play an important role in mitigating outdoor climate fluctuations. In this research, the effects of courtyards on the thermal performance of vernacular houses in HSCW climate zones were studied via field measurements and computational fluid dynamics (CFD) models. The selected courtyard house was a representative vernacular timber dwelling situated in the southeast of Chongqing, China. The indoor and outdoor air temperature measurements revealed that the courtyard did play an active role as a climatic buffer and significantly reduced the temperature’s peak value in the summer, while during the winter, the courtyard prevented the surrounding rooms from receiving direct solar radiation, and thus to some extent acted as a heat barrier. The contributions of thermal mass are quite limited in this area, due to insufficient solar radiation in winter and general building operations. The natural ventilation mechanism of courtyard houses in HSCW zones was further studied through CFD simulations. The selected opened courtyard was compared to an enclosed structure with similar building configurations. The airflow patterns driven by wind and buoyancy effects were first simulated separately, and then together, to illustrate the ventilation mechanisms. The simulation results show that the courtyard’s natural ventilation behavior benefited from the proper openings on ground level.

show abstract

“…A considerable body of work has been published on the operation and capacity of the different types of windcatchers to increase natural ventilation in buildings. Research that studies the functioning of the traditional windcatchers covers: (a) monitoring in buildings with windcatchers [7][8][9], (b) experiments with scale models in wind tunnels [10][11][12][13][14], supplemented with CFD, and (c) studies with CFD [15][16][17][18][19][20][21][22] at full size, generally made using commercial codes. The functioning of windcatchers is so convenient that many modern architectural designs seek their utilization.…”

Section: Introductionmentioning

confidence: 99%

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

Varela-Boydo

Moya

Watkins

2021

Journal of Building Engineering

View full text Add to dashboard Cite

show abstract

Numerical and experimental performance analysis of a four-sided wind tower adjoining parlor and courtyard at different wind incident angles

Cited by 33 publications

References 31 publications

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

The Effects of Courtyards on the Thermal Performance of a Vernacular House in a Hot-Summer and Cold-Winter Climate

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

Contact Info

Product

Resources

About