A. Sabzevari’s research while affiliated with University of Puerto Rico at Ponce and other places

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Publications (10)


Numerical analysis of two-dimensional wind flow in and around rectangular buildings. Part I: modelling and simulation
  • Article

January 1998

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11 Reads

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4 Citations

Wind Engineering

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A. Sabzevari

This paper analyses turbulent air flows in and around single and multiple rectangular buildings, with consideration of ventilation effects. The Navier-Stokes and k-ε equations of the turbulence model are solved numerically to develop airflow and ventilation patterns for Reynolds numbers ranging from 105 to 106. Two different computer programs - FKE based on the standard k-ε model and FAKN based on a model of turbulent flow at low Reynolds numbers - are developed and their resulting simulations compared. Results are presented as contours of turbulent kinetic energy, turbulent energy dissipation rate and turbulent kinematic viscosity; in some cases constant pressure patterns are also indicated.


Numerical analysis of two-dimensional wind flow in and around rectangular buildings. Part II: flow field and ventilation

January 1998

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8 Reads

Wind Engineering

In this paper, simulation obtains further flow patterns around and through simple rectangular buildings, with and without apertures, singly or in series, with varying aspect ratio and spacing. Flow parameters, including velocity vectors, streamlines, pressure contours and locations of separation and reattachment are developed for an Re range of 2 × 105 to 5 × 106. The effects on ventilation rates of the flow interactions between buildings are studied for various aperture combinations.


Further data on solar radiation in Shiraz, Iran

April 1996

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50 Reads

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26 Citations

Renewable Energy

Instantaneous solar radiation data read from the chart of global solar radiation on a horizontal surface as well as sun shine hours in Shiraz during the 1991–1993 period are analysed and compared with solar conditions in the 1970s and 80s. It is apparent from the recorded data and the consequent analysis of the statistics that, while the city of Shiraz possesses a relatively high abundance of sunshine with clear sky index conditions, there is a gradual decay in the values of instantaneous solar radiation and its maximum.


Solar radiation for Shiraz, Iran: a comparative study for two periods

September 1993

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15 Reads

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8 Citations

Renewable Energy

Instantaneous solar radiation data read from the chart of global solar radiation on a horizontal surface as well as sunshine hours in Shiraz during two periods (1980–1983 and 1988–1990) are analysed and compared with solar conditions in the early 1970s. It is apparent from the recorded data and subsequent analysis that while this area still possesses a relatively high abundance of sunshine, there has been a gradual decay in clearness index. Frequency of clear sky days, the average daily irradiation and the mean cumulative annual irradiation for the two periods under study are presented and a decrease in solar radiation received on a horizontal surface due to down grading of Shiraz from the clear sky conditions enjoyed in the 1960s and 1970s is demonstrated.


Airflow behaviour in and around domed roof buildings

January 1992

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23 Reads

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8 Citations

Wind Engineering

The characteristic features of airflow in and around a number of ideal geometrical configurations representing typical domed roof buildings of the hot arid region in the Middle East are studied. These configurations are composed of models of isolated cuboid, cuboid with domed roof and multiple domed roof buildings subjected to a light boundary layer wind in a wind tunnel. A very simple technique of generating smoke streams inside the tunnel is developed and the essential features of air flow in and around the test models including flow separation, flow reattachment and vortex formation are visualized and discussed.


Wind towers: Measurement and performance

December 1991

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105 Reads

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67 Citations

Solar Energy

Thermal performance of three naturally ventilated public buildings in which the wind tower is an important architectural feature is studied. One of the three buildings as well as it's wind tower is instrumented for temperature, relative humidity and airflow velocity measurements, and the other two are instrumented for temperature measurement. The results have led to a discussion concerning the degree of wind tower effectiveness in achieving thermal comfort.


Performance of wind towers for solar passive cooling in hot arid regions

January 1991

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13 Reads

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1 Citation

Three ancient wind towers 'Baud-Geer' which are still in operation for enhancing air circulation and providing possible passive cooling in two locations on the edge of the Persian desert are identified. One of the towers and its building was instrumented for temperature, airflow and relative humidity measurements. The other two were instrumented for temperature. Thermal performance of each building is presented. It is shown, that despite what has been qualitatively claimed, wind towers could only be effective in hot arid regions if airflow through the tower is wetted before entering the living spaces, thus acting as an evaporating cooling system.


Solar radiation intensity on domed roofs

December 1990

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39 Reads

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14 Citations

Solar & Wind Technology

Solar radiation intensity on semispherical and domed shape surfaces are formulated and numerical values of the intensity are computed by the method of finite difference. For a specific geographical location, the portion of the curved surface in shade and the locus of the shade made by the curved surface on the adjacent flat areas are computed and tabulated for certain hours and days of the year. Although the numerical results are valid for the specified geographical location, the mathematical model is capable of predicting solar intensity, shaded area on the curved surface and the locus of shade made by the domed roof on adjacent flat areas for any location. Total solar power over the base and the produced shaded area are computed for both types of curved roof surfaces.


Studies on simulations of passive solar buildings

December 1987

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10 Reads

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8 Citations

Solar & Wind Technology

The dynamic performance of a passive solar building in response to local meteorological data is analyzed by means of modeling and simulation. After the simulation method is validated by comparing certain results with the experimental data measured from a similar building, effects of a number of parameters on the building's thermal performance are described. These parameters include room size, wall thickness and air ventilation rate.


Alternative energy sources in Iran: the state-of-the-art

15 Reads

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2 Citations

Iran, the country well known for its enormous proven reserves of oil (fourth largest in the world), natural gas (second largest), and coal (considerable) is also one of the most favourable countries for utilization of solar, wind and other alternative energy sources. Depsite an average of 5 KWh/m²/day of solar energy over a large land area, and sites with frequent wind velocities of 7 m/s, very little attention has been paid to non-fossil fuels. Petroleum, on the other hand, has not only been the main fuel for Iran, but has also provided the country with its major revenue. Furthermore, the low cost of oil and gas has pushed the alternative energy sources into an unfavorable position. The main question is, for how long can such an energy picture go on. To answer this important question, the authors have attempted, firstly, to draw a concise energy picture (fuel and power production, distribution, demands and policies), and secondly, to list the potentials of the alternative energy sources. The paper also includes a critical review of the work done and the programs in connection with alternative energies in Iran.

Citations (9)


... Wind towers, also named wind catchers or baud-geers, have been used since ancient times, especially in the desert regions of Asia, due to its good performance under hot dry conditions [157][158][159][160][161][162]. Its operation consists in cooling the air inlet (introduced through a tower opening) by evaporative cooling, circulating it within the building (normally located under the tower) and expulsing it by buoyance and/or wind effect through a different opening located on the opposite side of either the building or the tower [163]. ...

Reference:

Active and passive cooling methods for dwellings: A review
Performance of wind towers for solar passive cooling in hot arid regions
  • Citing Article
  • January 1991

... Researches on the cisterns can be classified to three major groups: history and functionality of cisterns (Dehghani 2006;Saeidian 2013;Dorraj et al. 2014), investigation on the effect of different parts on cistern performance e.g. windcatcher and domed roof (Penwarden and Wise 1975;Yaghoubi 1991;Sabzevari and Yaghoubi 1992;Tang et al. 2006;Pirnia 2009;Prhashanna and Chhabra 2010;Tavakol et al. 2010;Najafi et al. 2014;Rahmatmand et al. 2014;Najafi and Yaghoubi 2015) and studies on the cistern's reservoir (Bahadori and Haghighat 1988;Dehghani and Aghanajafi 2006;Arefmanesh et al. 2009;Madoliat et al. 2009;Razavi et al. 2015). Najafi et al. (Najafi et al. 2014) simulated inside and outside of a cistern numerically. ...

Airflow behaviour in and around domed roof buildings
  • Citing Article
  • January 1992

Wind Engineering

... Then, by including the moisture creation system, modeling, and analysis are performed once again, comparing these models to choose the model that performs the best. air exit increases with the height of the wind defl ector [35]. Due to the development of negative pressure and the suction of heated interior air, wind defl ectors with independent multichannels cause the desired wind to enter from one direction and depart in the direction opposite to the wind [36]. ...

Numerical analysis of two-dimensional wind flow in and around rectangular buildings. Part I: modelling and simulation
  • Citing Article
  • January 1998

Wind Engineering

... Therefore, these systems are not economical for rural areas with low population congestion (Peñate and GarcíaRodríguez, 2012). On the other hand, solar desalination systems have low operation and maintenance costs and environmental compatibility but require large installation areas and high initial investments (Goosen et al, 2003; Sabzevari, 1983). Iran is located on the sun belt of the world and it is among the countries with the highest irradiation. ...

Alternative energy sources in Iran: the state-of-the-art
  • Citing Article

... The findings suggested that the hemispherical dome receives nearly 35% less solar energy than a flat roof [13]. Moreover, wind direction around domed roofs was found to be more than that around flat roofs [14]. Studies have sought to calculate the intensity of solar radiation on spherical and domed surfaces through numerical studies for a specific geographical location [15]. ...

Solar radiation intensity on domed roofs
  • Citing Article
  • December 1990

Solar & Wind Technology

... According to the available solar radiation data, Shiraz, the capital of Fars Province in southern Iran, received the top rank among different cities as the most suitable option for a solar power plant [58]. To maximize radiation use, the operating periods of each mode were intelligently determined in different months. ...

Solar radiation for Shiraz, Iran: a comparative study for two periods
  • Citing Article
  • September 1993

Renewable Energy

... Vernacular windcatcher is a type of green technology, which is called Baud-Geer in the Persian Gulf area and Malqaf in the Arabic architecture such as Egyptian architecture [20][21][22]. Malqaf is regarded as a bidirectional windcatcher which is mounted on the top of Arab's covered court yard [23] (Figure 1). Baud-Geer, on the other hand, is not only bidirectional and has diverse forms, and various shapes and they are used during summers and are closed during winters [24]. ...

Wind towers: Measurement and performance
  • Citing Article
  • December 1991

Solar Energy

... There is some work, but not extensive, on preconditioning and storage loads presented in the literature. However, some early work by Smith [2,3) Yaghoubi and Sabzevari [24] concluded that the glass and its orientation, and the dimensions of the east-west walls have the major effect on temperature swings. ...

Studies on simulations of passive solar buildings
  • Citing Article
  • December 1987

Solar & Wind Technology