Alireza Zolfaghari

Alireza Zolfaghari
University of Birjand · Department of Mechanical Engineering (Birjand)

PhD in Mechanical Engineering

About

238
Publications
38,976
Reads
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394
Citations
Citations since 2017
117 Research Items
302 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Additional affiliations
June 2018 - present
University of Birjand
Position
  • Professor (Associate)
September 2011 - June 2018
University of Birjand
Position
  • Professor (Assistant)
September 2011 - present
University of Birjand
Position
  • Professor
Education
September 2006 - September 2010
Tarbiat Modares University
Field of study
  • Department of Mechanical Engineering
September 2004 - September 2006
Tarbiat Modares University
Field of study
  • Department of Mechanical Engineering
September 2000 - September 2004
Amirkabir University of Technology
Field of study
  • Department of Mechanical Engineering

Publications

Publications (238)
Article
Thermal response of the human cutaneous thermoreceptors depends statically upon temperature and dynamically on the temperature change rate at the depth of the thermoreceptors. Therefore, it is very important to estimate the time-dependent thermoreceptors temperature with a good accuracy. On the other hand, the temperature distribution in skin tissu...
Article
In the standard thermal sensation models such as Fanger's and Gagge's models, the clothing system is simulated as an overall insulation covering the whole body. But under actual conditions, some segments of body are bare and other parts are covered by clothing. In addition, there is a significant difference between thermal sensation of the bare and...
Article
Radiant floor heating systems are usually designed in such a way that the sedentary persons feel thermal neutrality. On the other hand, in most of eastern countries, people traditionally tend to directly sit or sleep on the floor. This could arise some limitations in using of the floor heating systems in the countries with such eastern lifestyle. T...
Article
About 20 years ago, Ring and de Dear [Ring JW, de Dear R. Temperature transients: A model for heat diffusion through the skin, thermoreceptor response and thermal sensation. Indoor Air 1991; 1(4):448–56] introduced a thermal response index (R) for evaluating the cutaneous thermoreceptor response and thermal sensation. Although the mentioned index p...
Article
Full-text available
So far, all of the thermal sensation models have been developed on the basis of energy balance equations for each compartment of the human body. But, the human body feels thermal environment by response of cutaneous thermoreceptors, not by balance of energy. Therefore, the mentioned models are not in conformity with the physiology of thermal sensat...
Article
Carpeting is one of the most efficient approaches to provide both the acoustic and thermal insulation, and improve the comfort of building inhabitants. In the current research work, the acoustic and thermal properties of handmade carpets as one of the commonly used textile products in several countries, especially in Middle-East countries, have bee...
Article
In this study, the effect of foot wearing on local and overall thermal sensation has been experimentally investigated under a personalized ventilation system in an office. Accordingly, the overall and local sensation of occupants for two arrangements of diffusers (desktop and under the desk) and two different clothing (A: conventional office clothi...
Article
Full-text available
Over centuries different elements have been developed in architectures for ensuring adequate natural ventilation in residential units. This study assesses the different components of an ancient windmill in Sistan, Iran, on the structure's indoor air quality (IAQ) enhancement. Several climatic scenarios have been defined by the wind analysis of Sist...
Article
In this study, a class of GPU-based corrected explicit-implicit domain decomposition schemes (GCEIDD) is proposed to accelerate the solution of convection-dominated diffusion problems on GPUs. All of these methods take advantage of the fractional steps and corrected explicit-implicit domain decomposition techniques. In each sweep, the domain is dec...
Article
Thermoregulatory models based on thermoreceptors have attracted the attention of researchers in recent years due to their conformity with the basis of human thermal perception. For this reason, various models have been presented such as STB, ITB, MSTB and JOSTB. In the present study and in continuation of previous studies, an individual multi-segme...
Article
Full-text available
A self-excited oscillating jet can be naturally produced by discharging a plane jet into a rectangular cavity due to pressure effects and without a need for external aid. In recent years, the self-oscillatory jet in non-isothermal conditions has attracted research interests because of its wide range of industrial applications. Therefore, the curren...
Preprint
Full-text available
Over centuries different elements have been developed in architectures for ensuring adequate natural ventilation in residential units. This study assesses the different components of an ancient windmill in Sistan, Iran, on the structure's indoor air quality (IAQ) enhancement. Several climatic scenarios have been defined by the wind analysis of Sist...
Article
Full-text available
Modeling body’s circulatory system with many vessels and capillaries and its effects on the body thermal conditions is complex. many thermoregulatory models have tried to model the effect of the circulatory system with simplistic and inaccurate assumptions. The MSTB model considers the blood as a node with specific heat capacity and constant temper...
Article
Outdoor thermal comfort is an important factor in designing urban spaces influencing outdoor activities, social interactions, tourism, wellbeing, and health. Focusing on seasonal differences, this study investigates the thermal comfort conditions and the actual thermal sensation of subjects , and attempts to calibrate the scale of subjects' thermal...
Article
In recent years, non-isothermal jets have received much attention due to their wide range of applications in the industry. The present work concentrates on comparing the buoyancy mediating effects on the performance and oscillating behavior of horizontal and vertical self-excited jets. To this aim, the oscillating behavior and performance character...
Article
Full-text available
By considering the importance of providing proper indoor environment conditions for occupants and also due to energy costs, one of the solutions for indoor local air-conditioning is Personalized Ventilation System (PVS). In this paper, the occupants’ thermal sensation was experimentally studied for body segments that are mostly affected by the PVS....
Article
Full-text available
One of the common local thermal discomforts that happen in an indoor environment is draught. Because of the importance of draught, many studies have been carried out to develop equations to calculate the draught rate. But because these equations are obtained from experimental tests in narrow experimental windows, their accuracy under wider environm...
Article
Full-text available
In this study, the flow pattern, temperature distribution and thermal comfort index have been experimentally investigated in a room with personalized confluent jets ventilation (CJV) system for different diffusers’ heights of 30 and 160cm from the floor and for two inlet temperatures of 16 and 24°C and three different inlet angles of 0, 22.5 and 45...
Article
Full-text available
In this research, it has been tried to experimentally investigate the effect of a personalized ventilation system on airflow and temperature distribution in a room for two inlet air temperatures (24 and 32°C) and two different arrangements of the inlet diffusers (desk-mounted and under-desk air terminals). The results showed that the penetration de...
Conference Paper
Full-text available
By considering the importance of providing proper indoor environment conditions for occupants and also due to energy costs, one of the solutions for indoor local air-conditioning is Personalized Ventilation System (PVS). In this paper, the occupants' thermal sensation was experimentally studied for body segments that are mostly affected by the PVS....
Conference Paper
Full-text available
One of the common local thermal discomforts that happen in an indoor environment is draught. Because of the importance of draught, many studies have been carried out to develop equations to calculate the draught rate. But because these equations are obtained from experimental tests in narrow experimental windows, their accuracy under wider environm...
Thesis
In recent years, the use of personalized ventilation systems has increased to locally provide the occupants’thermal comfort. The personalized ventilation systems, despite their advantages such as energy saving and high controllability, may cause local and overal thermal dissatisfaction due to localized and non-uniform flow on the body segments. On...
Article
Full-text available
One of the main concerns about the performance of the Under-Floor Air Distribution (UFAD) systems is the possibility of occurring local thermal discomfort such as draught and vertical temperature difference. In the present study, in order to investigate the occupants’ local discomfort, the distributions of air temperature, velocity and turbulence i...
Article
Full-text available
In the present study, a new alternating direction explicit-implicit domain decomposition approach is proposed by combining the alternating direction implicit method with the explicit-implicit domain decomposition method. The method is used for solving the two-dimensional conduction heat transfer equation on a graphics processing unit. In this metho...
Article
Full-text available
In recent years, the applications of under-floor air distribution (UFAD) systems have commonly increased for ventilation of office buildings. In the present study, the effects of inlet cooling air temperature from the diffusers of under-floor air distribution system have been experimentally investigated on the occupants’ local thermal sensation. In...
Article
Full-text available
Providing thermal comfort conditions in sleeping environment can significantly affect the occupants' health. So, the parameters of the air conditioning system must be properly set to satisfy thermal comfort criteria for persons with different physiological characteristics. In the present study, a task/ambient air conditioning system is modeled and...
Article
Full-text available
In swimming pools with spectators’ stand, due to differences in skin wetness, metabolic rates and clothing type of the swimmers and spectators, providing thermal comfort conditions for all residents is very difficult. Accordingly, a reasonable idea to provide the mentioned different comfort conditions is using the air curtain to aerodynamically sep...
Article
This paper presents an experimental study that evaluated the effects of three different non-uniform types of clothing ensembles (Type A: short-sleeve shirt, T-shirt underwear, men’s briefs, straight trousers, socks, shoes; Type B: long-sleeve shirt, T-shirt underwear, men’s briefs, straight trousers; and Type C: long-sleeve shirt, men’s briefs, str...
Thesis
One of the optimal systems for proper ventilation of the environment and creating favorable thermal comfort conditions for occupants is personalized systems. These systems are known for their ability to determine the speed, direction, and flowrate that distribute fresh and clean air near people. In this study, the thermal comfort and the thermal se...
Article
The objective of the present study was to investigate the effect of swirl angle on the distribution and deposition of contaminant particles in a chamber with swirl diffuser in an under-floor air distribution (UFAD) system. In the desired model, the analysis of flow field and particle distribution for swirling diffusers at four angles 30°, 45°, 60°,...
Article
Full-text available
In recent years, the modeling of human thermal sensation based on thermoreceptors response has attracted the attention of many researchers. However, the biological tissues does not usually follow the principles of Fourier heat transfer. So, the present research aims to develop a new predictive index for a thermal comfort model based on cutaneous th...
Article
The paper presents a numerical study on an impingement cooling system which employs a self-excited oscillating air jet discharging into a confined space. The effect of nozzle width was examined on the flow structure and heat transfer at different inlet flow rates and impinging distances. The unsteady incompressible flow was solved by the finite vol...
Article
The paper presents a numerical study on an impingement cooling system which employs a self-excited oscillating air jet discharging into a confined space. The effect of nozzle width was examined on the flow structure and heat transfer at different inlet flow rates and impinging distances. The unsteady incompressible flow was solved by the finite vol...
Article
In the present study, an efficient GPU-based corrected explicit–implicit domain decomposition scheme is proposed to accelerate fractional steps solvers. Implicit time advancement in fractional steps solvers leads to several independent tri-diagonal systems. In the present method, by decomposing the domain and predicting the solution at the interfac...
Article
Full-text available
Nowadays,most people spend their time in the interior spaces.Therefore,particulate pollutants in these spaces are serious threat to the health of human.Hence,the investigation on distribution and deposition of particle pollutants in indoor spaces is important for assessing indoor air quality.Due to the wide use of fan coils in interior spaces for c...
Article
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Conference Paper
Full-text available
In recent years, Personalized Ventilation (PV) systems have been applied in several indoor spaces, such as offices, theatre halls, vehicle cabins, airplanes and so on. The personalized ventilation systems have several advantages such as low energy consumption, and high air quality in the breathing zone. On the other hand, acceptability of air movem...
Conference Paper
Full-text available
Oscillatory flow can be observed in the presence of one and also two self-excited jets issuing into a cavity. Until now no investigation has been done on a double-inlet self-excited jet. In the present work, the characteristics of the oscillatory flow caused by a double-inlet jet in a rectangular cavity are studied and compared with those of a sing...
Conference Paper
Full-text available
Thermal comfort and indoor air quality in the built environments are important issues that affect the occupants' health and performance. Confluent Jets Ventilation (CJV) system is a new HVAC system that can reduce the energy consumption by performing a high indoor air quality for the occupants. This paper presents an experimental evaluation of an i...
Article
Full-text available
Particle pollutants in the indoor environment are a serious threat to human health. Therefore, it is necessary to recognition, investigation, and controls of the distribution of these particles in the indoor environment. In the present research, the effect of air inlet angle of swirling diffusers in UFAD systems has been investigated on micron part...
Article
Full-text available
Providing thermal comfort conditions for vehicle occupants, especially public transport is a complicated issue due to the density of population and non-uniformity in individual and environmental conditions. So, an important evidence of individual non-uniformity is the variety in passengers' wearing; e.g. in many cases, some passengers have a higher...
Thesis
Reducing the harmful effects of urban heat islands is one of the major challenges for researchers that require heat modulation strategies to create sustainable cities. One of the most important principles of open space design is to consider thermal comfort in order to improve the quality of space and to satisfy people. This study tries to improve...
Conference Paper
Full-text available
Oscillatory flow in a rectangular cavity may occur in the presence of a turbulent jet due to Coanda effect or non-uniformities in pressure. In the present research, the numerical simulation was carried out by the finite-volume based tool OpenFOAM code to investigate the influence of non-isothermal conditions on the frequency and amplitude in the os...
Conference Paper
Full-text available
In the present study, a combined method of ADI and CEIDD (ADI-CEIDD) is proposed. In this method, the number of independent tridiagonal systems are more than the ADI method and this allows for more parallelism. Compared with the parallel methods for tridiagonal system of equation the present method does not add any significant overhead to the ADI a...
Conference Paper
Full-text available
Air movement acceptability plays an important role in the occupants' comfort under HVAC. In the present study, we aimed to investigate the air movement acceptability in two different arrangements of UFAD diffusers at three different inlet air temperature of 12, 16 and 20°C. The first arrangement (Case 1) is about the conditions that the UFAD diffus...
Article
Full-text available
استفاده از سیستم‌های تهویه انفرادی به‌ویژه در ساختمان‌ها از موضوعات جدیدی است که امروزه به‌دلیل کارایی مناسب آن‌ها در کاهش مصرف انرژی و ایجاد شرایط بهتر آسایش حرارتی، به آن پرداخته می‌شود. در تحقیق حاضر، میزان مصرف انرژی یک سیستم سرمایش انفرادی مستقر در یک اتاق، با در نظر گرفتن قید آسایش حرارتی مورد ارزیابی قرار گرفته و با سیستم سرمایش غیر انفرادی...
Article
In non-uniform environments, different body parts may experience different ranges of physical/environmental parameters. Therefore, to assess the overall thermal sensation in non-uniform environments, the local temperature/thermal sensation of various body parts should be calculated. The local temperature/thermal sensation based on cutaneous thermor...
Article
Full-text available
آسايش حرارتي حالتي ذهني است که ميزان رضايت فرد از شرایط حرارتی محيط را بيان مي‌کند. قضاوت دربارة آسايش حرارتي فرايند پيچيده‌اي است که تحت تأثير عوامل فيزيکي، فيزيولوژيکي و روانشناختي قرار دارد. تحقیقات انجام شده در زمینه بررسی احساس و آسایش حرارتی، شامل مطالعات تحلیلی، مطالعات آزمايشگاهي و تدوين استانداردها مي‌باشد. در رویکرد تحلیلی از طریق معادلات...
Conference Paper
Full-text available
هدف این تحقیق بررسی عملکرد یک سیستم سرمایش انفرادی در محیطی اداری برای فراهم آوردن شرایط آسایش حرارتی کارکنان در فصل گرم سال می¬باشد. بدین منظور یک محیط اداری با سیستم سرمایش انفرادی مدل¬سازی شده و دمای ورودی به-گونه¬ای انتخاب شده است که میزان میانگین رای فرد برابر 0.5 شود. از طرفی پاسخ حرارتی بخش¬های مختلف بدن افراد به¬دلیل یکسان نبودن نوع پوشش و...
Conference Paper
Full-text available
بررسی توزیع ذرات آلاینده در داخل اتوبوس به عنوان یکی از وسایل نقلیه پرکاربرد که دارای تراکم بالای جمعیت است، به منظور بررسی کیفیت هوای داخل از اهمیت فراوانی برخوردار است. سیستم تهویه اختلاطی بالاسری و جابه‏جایی کفی، دو سیستم تهویه متداول مورد استفاده در اتوبوس‏ها هستند که در پژوهش حاضر به مقایسه این دو سیستم از نقطه نظر پراکندگی و دفع آلاینده‏های ذ...
Conference Paper
Full-text available
از میان کاربرد¬¬¬¬های حرارتی انرژی خورشیدی، سیستم¬های ترکیبی گرمايش خورشیدی، به دليل فن¬آوری نسبتا ساده¬ ومزيت¬هاي اقتصادی در مقایسه با سایر سيستم¬هاي خورشید¬ي، بیشتر مورد توجه قرار گرفته¬اند. دلیل ارجحیت این سیستم¬ها در تامین آب گرم و گرمایش خورشیدی، نیاز به سطح دمای متوسط بوده که این دما با استفاده از کلکتور صفحه تخت و با هزینه کمتر نسبت به سایر...
Article
Full-text available
In the warm season, the performance of double skin facades has a significant dependence on the façade design details and climatic conditions. On the other hand, using the double skin facades can increase the building cooling load. In order to eliminate this problem, two different approaches have attracted the intrest of engineers: solar energy stor...
Article
Full-text available
In dense occupancy spaces, providing the proper conditions especially as indoor air quality is very important. On the other hand, in most air distribution systems, the ventilation performance and energy saving parameters are greatly influenced by the arrangements of supply diffuser positions. Therefore, in this study, the effects of supply diffuser...
Thesis
The freezing process and the rate of cooling in biological tissues have a strong effect on the formation of ice crystals which eventually play an important role in tissue’s cells survival during freezing. The goal of this study is to investigate the harmful effects of severe coldness and tissue behavior in freezing conditions using non-Fourier heat...
Article
Full-text available
In the indoor swimming pools, due to presence of people with different individual characteristics, it is important to design an air conditioning system which can provide thermal comfort conditions for the occupants. Since the differences in the persons’ individual parameters such as gender and body composition, it is required to study the effect of...
Article
Physiologically, the thermal sensation/perception of human body is related to the response of cutaneous thermoreceptors (TRs) to the environment. However, the thermal response of skin warm and cold TRs is a function of two important factors: TRs temperatures and their time derivative at the subcutaneous locations of TRs. The available thermal model...
Thesis
Thermal environments are often non-uniform and transient. The conventional and standard thermal comfort models are based on the energy balance equation and only applicable in uniform or steady-state thermal conditions. Further, these thermal models predict the overall thermal sensation for the whole-body. However, under non-uniform conditions, the...
Book
Full-text available
مشکلات حین اجراعدم توجه به مسئله نويز و سر و صدا در تاسيسات گرمايش / سرمايش ساختمان‌ها، باعث ايجاد نارضايتي مصرف كننده مي‌شود. چنانچه طراح و مجري به مساله نويز و سر و صدا، كم توجهي نموده باشند، مشكلات آكوستيكي مي‌تواند باعث شود كه مصرف كننده به كلي از سيستم استفاده نكرده يا سيستم ديگري را جايگزين نمايد كه باعث هدر رفت بسياز زياد سرمايه و انرژي خواه...
Article
Full-text available
General Purpose Graphics Processing Unite (GPGPU) allows the user to utilize GPU for general computing purposes. Using these processors can cause a significant speedup in numerical calculation for solving CFD problems. Several studies have been performed to investigate the advantages of using the GPGPU in numerical calculations including solving tr...
Thesis
In swimming pools with spectators’ stand, due to differences in skin wettedness, metabolic rates and clothing type of the swimmers and spectators, providing comfort conditions for all occupants is very difficult. Accordingly, a reasonable idea to provide these different comfort conditions is using the air curtain in order to aerodynamic separation...
Thesis
Thermography or infrared imaging is a regular method for collecting, storing and analyzing infrared radiation energy using imaging devices. Also, it is a non-invasive, non-contact method which is capable of imaging in a very short period of time and from relatively distant intervals, thus allowing simultaneous monitoring of a large area. Due to the...
Thesis
Personal factors such as weight, height, gender, age, and basal metabolic rate (BMR) all have significant effects on body temperature distribution and thermal sensation. A large number of well-known human body thermoregulatory models are population-based however, and cannot evaluate the impact of individual characteristics on human thermal response...