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    Simulation of ventilation effects on indoor radon

    , Article Management of Environmental Quality ; Volume 24, Issue 3 , 2013 , Pages 394-407 ; 14777835 (ISSN) Akbari, K ; Mahmoudi, J ; Ghanbari, M ; Sharif University of Technology
    2013
    Abstract
    Purpose: The purpose of this paper is to describe the use of computational fluid dynamics (CFD) to simulate indoor radon distribution and ventilation effects. This technique was used to predict and visualize radon content and indoor air quality in a one-family detached house in Stockholm. The effects of intake fans, exhaust fans and doors on radon concentration were investigated. Design/methodology/approach: In this study a mechanically balanced ventilation system and a continuous radon monitor (CRM) were used to measure the indoor ventilation rate and radon levels. In a numerical approach, the FLUENT CFD package was used to simulate radon entry into the building and ventilation effects.... 

    An Analysis of Key Factors Contributing to Residential Property Valuation in Iran

    , M.Sc. Thesis Sharif University of Technology Naderi, Iman (Author) ; Sharbatoghlie, Ahmad (Supervisor)
    Abstract
    It is our purpose in this study to compare and analyze behavioral aspects of residential property valuation in Iran. More specifically, this research aims to explore the attributes that influence the value of residential property from the consumers’ and valuers’ perspective to determine whether valuers account for consumer behavior accurately. Finally, we investigate which variables operate at the lower end of the market, as distinct from those influencing the value of higher priced property. The core methodology underpinning the measurement of buyer and valuer behavior is the use of survey analysis. The identification of variables employing a two stage process forms an initial but critical... 

    Deriving a Model for Determining the Relative Utility of Residential Apartments for Private Buyers

    , M.Sc. Thesis Sharif University of Technology Behdad, Kian (Author) ; Isaei, Mohammad Taghi (Supervisor)
    Abstract
    In this research, the aim is to find the factors that can influence on the utility perception of both private buyers and experts. What's more, the share of each factor on the overall utility is derived by the use of AHP technique. The next step is to derive a model that contain all the factors seen by private and inexpert buyers., and their relative weight. At the next step, the aime is to complete the model by adding the factors not seen by all private buyers, but advised by residential apartment experts and their relative weight. The model should be able to rank different residential apartments, when the value of each factor is given for each ot the apartments.

     

    Causes of Differences Between the Design and Implementation from the Quality Point of View in the Private Sector in Tehran, and Finding Solutions for Reducing or Eliminating this Problem

    , M.Sc. Thesis Sharif University of Technology Kashi, Amin (Author) ; Mortaheb, Mohammad Mehdi (Supervisor) ; Ghaemian, Mohsen (Supervisor)
    Abstract
    In a macro view point, it can be said that housing demand in recent years is making the construction industry one of the main sectors of Iran’s economy. On the other hand, analysis of seismic risk in the country with regard to the geological conditions, the faults, and the seismic records of mega city of Tehran is depicting the delicate location of the Iranian capital. This city is selected as a case study in this thesis that has a high probability for the event; where this event has also been classified as a devastating earthquake ever. Due to the involvement of private sector in construction industry, the need for establishing a system of strict control on quality of construction of the... 

    The Impact of Metro Station Inauguration on Housing Prices in Tehran

    , M.Sc. Thesis Sharif University of Technology Yazdanifard, Yekta (Author) ; Talebian, Masoud (Supervisor) ; Joshaghani, Hossein (Supervisor)
    Abstract
    The impact of opening of the metro station in the city, given the advantages and disadvantages faced by residents adjacent to the station, could have different effects on housing prices. Various studies have been conducted to reveal the impact of urban transport on the value of property, each with different results. In the investigation of this issue, there has been positive, negative or even insignificant effect on the construction of a transport corridor on the value of the property. In this research, the effect of the opening of the metro station as a type of transportation corridor has been investigated on the value of residential properties around the station. Different parts of Tehran,... 

    Identifying Root Causes of Residential Building Project Delays in Mashhad

    , M.Sc. Thesis Sharif University of Technology Farmani, Nima (Author) ; Alvanchi, Amin (Supervisor) ; Haji Yakhchali, Siamak (Co-Advisor)
    Abstract
    The residential construction projects are an important and extraordinary part of the economy of Iran. Due to their important role and lots of problems that these kinds of projects face, this research was conducted. Delay is one of the main problems in these projects. In order to identify the causes of delay and propose recommendations to minimize it in Mashhad, Iran, a comprehensive literature review and interview with experts were conducted. One hundred and eight factors were identified and categorized into nine main groups. Based on the identified factors, a questionnaire survey was prepared, developed and distributed among the people who were active in the residential construction... 

    Evaluation of Sustainable Development of Energy Systems of Residential Buildings, Considering the Aspects of Environmental, Economic and Social

    , M.Sc. Thesis Sharif University of Technology Ali Ghanbari, Mohammad Hossein (Author) ; Abrishamchi, Ahmad (Supervisor)
    Abstract
    Today, energy has a great impact on the economy, political relations, prosperity, and lifestyle of human societies. Energy sustainable development has become inevitable because of factors such as increasing population growth and as a result, increasing the energy consumption, consuming more energy from fossil fuels, decreasing in reserves of fossil fuel resources, environmental damage caused by the burning down of fossil fuels and greenhouse gas emissions,high cost of energy from burning fossil fuels.Generally, the sustainable development isall steps in order to comply with economic development and protecting the environment, resources and living standards. Considering that a large part of... 

    Comparative Material Waste Analysis in Residential Construction Projects
    (Cost Plus and Lump Sum Contracts)

    , M.Sc. Thesis Sharif University of Technology Rezaee, Mojtaba (Author) ; Mortaheb, Mohammad Mehdi (Supervisor)
    Abstract
    Type and terms of payment is one of the most important fundamentals of any construction project contract. Suitable contract type is selected based on available financial options, payment systems, project schedule and other uncertainties of project environment. Commonly in Iran; private residential construction projects are executed using cost plus or lump sum contracts. Based on project’s contract type, costs of materials’ waste are to be borne by different parties. For example in cost plus contracts, the costs of materials as well as wastes are paid by owner while in lump sum contract this cost is paid by contractor. Considering limited budget of construction projects, materials’ waste... 

    Applying materials waste quantification to cement waste reduction in residential buildings of Tehran: A case study

    , Article Scientia Iranica ; Volume 26, Issue 5 A , 2019 , Pages 2633-2652 ; 10263098 (ISSN) Mahpour, A ; Alvanchi, A ; Mortaheb, M. M ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    The purpose of this research was twofold; first, it focused on developing quantitative wastage models for rebar, concrete, brick, and cement, as major traditional bulk building materials, used in Tehran residential buildings. The primary results indicated that multiple linear regression was an apt tool to model the effects of the studied variables on materials wastage. In every developed wastage model, subtractive or accumulative effect of each studied variable was recognized by its coefficient value and sign. The developed models resulted in adjusted R2 values of 0.907, 0.875, 0.920, and 0.790, respectively, for rebar, cement, brick, and concrete waste. Cement, with average wastage of 8.57%... 

    Applying materials waste quantification to cement waste reduction in residential buildings of Tehran: A case study

    , Article Scientia Iranica ; Volume 26, Issue 5 A , 2019 , Pages 2633-2652 ; 10263098 (ISSN) Mahpour, A ; Alvanchi, A ; Mortaheb, M. M ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    The purpose of this research was twofold; first, it focused on developing quantitative wastage models for rebar, concrete, brick, and cement, as major traditional bulk building materials, used in Tehran residential buildings. The primary results indicated that multiple linear regression was an apt tool to model the effects of the studied variables on materials wastage. In every developed wastage model, subtractive or accumulative effect of each studied variable was recognized by its coefficient value and sign. The developed models resulted in adjusted R2 values of 0.907, 0.875, 0.920, and 0.790, respectively, for rebar, cement, brick, and concrete waste. Cement, with average wastage of 8.57%... 

    A New Pattern for Controlling Construction Waste, An Approach Toward Sustainable Development

    , M.Sc. Thesis Sharif University of Technology Mahpour, Amir Reza (Author) ; Mortaheb, Mohammad Mehdi (Supervisor) ; Sebt, Mohammad Hassan (Co-Advisor)
    Abstract
    Wasteful approach in utilizing construction materials will result in depletion of resources and sacrificing future generations rights which is against sustainable development per se. As a corollary, presenting a new approach is aimed in this dissertation in order to decline avoidable building materials’ waste to the possible extent. This research focuses on wasted materials or construction waste. In this research, data about wastages of construction materials is gathered by surveying 32 residential buildings in Tehran. Afterwards, using multiple linear regression by IBM SPSS, wastages are quantified in terms of controllable independent variables namely floor area, number of stories, contract... 

    An Investigation on Deficiencies and Factors Affecting Construction Procedure; Case Study: Fars Province

    , M.Sc. Thesis Sharif University of Technology Imanieh, Alireza (Author) ; Mofid, Masoud (Supervisor) ; Mortaheb, Mohammad Mehdi (Co-Advisor)
    Abstract
    Most regions in Iran are located on an active plate boundary. Therefore, many parts of the country face a risk of earthquake damage at some point in time. Therefore, anticipating and addressing the consequences of earthquake events in order to minimize loss of life and damage to property is a national issue.There is concern about the ability of a signification fraction of buildings in Iran to withstand earthquake events. The deficiencies in the design and construction of buildings in Iran result in low-quality buildings vulnerable to earthquakes. It is necessary to identify and investigate the parameters that contribute to these deficiencies.Previous research studies indicate that... 

    Analysis of Seismic Vulnerability Reduction Policies of Residential Buildings Using a Multi-agent Evolutionary Game Model Based on Prospect Theory

    , M.Sc. Thesis Sharif University of Technology Hosseini, Ahmad (Author) ; Kashani, Hamed (Supervisor)
    Abstract
    Due to the vulnerability of urban fabric and residential buildings to earthquakes and considering its destructive social and economic effects on society, the need to adopt appropriate policies to prevent and reduce vulnerability, has been increasingly considered by policy makers. Despite the laws, regulations, incentives and penalties that policymakers have envisioned to prevent unprincipled and unsafe construction, evidence shows that a significant number of new buildings being built in the country are not earthquake resistant and there are many violations in design, implementation and supervision that is done by the stakeholders. To solve this problem, research has been done on the... 

    Design of Condensing Heat Exchangers for Recovery of Heat and Water from Flameless Combustion Flue Gas

    , M.Sc. Thesis Sharif University of Technology Homaei, Shabnam (Author) ; Saboohi, Yadollah (Supervisor)
    Abstract
    The exit flue gas temperature of conventional gas fired boiler is generally high and considerable energy is lost to environment. Therefore, new methods are needed to recover water and heat from boiler flue gas in order to reduce overall plant water consumption as well as to increase energy efficiency and mitigate detrimental emissions. This project involved design of a heat and water recovery system including condensing heat exchangers to be used in residential buildings. In this project based on simulation of heat and water recovery system the recoverable amount of heat and efficiency improvement potential at various conditions such as different exit flue gas temperatures and different... 

    The Application of Deep Learning Models in Estimating the Energy of Residential Buildings

    , M.Sc. Thesis Sharif University of Technology Mohammadzadeh, Mohammad (Author) ; Rafiee, Majid (Supervisor) ; Shavandi, Hassan (Co-Supervisor)
    Abstract
    Electricity consumption has increased dramatically in recent decades, and this increase has severely affected electricity distribution. Therefore, forecasting electricity demand can provide a precondition for distributors. Predicting power consumption requires many parameters to be considered.In this research, machine learning, and deep learning methods such as recursive neural networks, long short-term memory networks, etc., as well as the ARIMA model will be used. These models have been tested on the London Smart Measurement Database. In order to evaluate the capability of the models in forecasting electricity consumption, each has been used to predict the electricity consumption of a... 

    Technical assessment of ground-source, air-source, and hybrid heat pumps for single-family buildings in cold climates

    , Article 25 June 2016 through 29 June 2016 ; Volume 122 , 2016 , Pages 270-280 ; 00012505 (ISSN) ; 9781939200464 (ISBN) Eslami Nejad, P ; Hakkaki Fard, A. M ; Aidoun, Z ; Ouzzane, M ; Sharif University of Technology
    Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc 
    Abstract
    This paper discusses a technical comparison of a directexpansion ground-source heat pump (DX-GSHP) and an airsource heat pump (ASHP). To lower the ground heat exchanger size for cost reduction purposes, the system performance of a hybrid system is also evaluated using a supplementary air evaporator combined with the DX-GSHP. Detailed screening models previously developed for ASHPs and DX-GHSPs are first used to compare the seasonal performance of these two options for a residential building in the cold-climate city of Montreal, Canada. Then, the model is adopted for performance evaluation of the hybrid system. Additionally, different parameters including borehole total length and heat pump... 

    Matching of local load with on-site PV production in a grid-connected residential building

    , Article Energies ; Volume 11, Issue 9 , 2018 ; 19961073 (ISSN) Bashir, A. A ; Pourakbari Kasmaei, M ; Safdarian, A ; Lehtonen, M ; Sharif University of Technology
    MDPI AG  2018
    Abstract
    Efficient utilization of renewable generation inside microgrids remains challenging. In most existing studies, the goal is to optimize the energy cost of microgrids by working in synergy with the main grid. This work aimed at maximizing the self-consumption of on-site photovoltaic (PV) generation using an electrical storage, as well as demand response solutions, in a building that was also capable of interacting with the main grid. Ten-minute resolution data were used to capture the temporal behavior of the weather. Extensive mathematical models were employed to estimate the demand for hot-water consumption, space cooling, and heating loads. The proposed framework is cast as mixed-integer... 

    Interaction of glazing parameters, climatic condition and interior shadings: performing energy and cost analysis in a residential building in Iran

    , Article Energy Efficiency ; Volume 13, Issue 1 , 21 December , 2020 , Pages 159-176 Yousefi, F ; Gholipour, Y ; Saboohi, Y ; Yan, W ; Sharif University of Technology
    Springer  2020
    Abstract
    In this paper, the interaction between various window specifications and different climate conditions is investigated. For this purpose, simultaneous effects of several aspects including glazing system, glass type, filling gas, glass thickness, window frame fraction, and interior shading are considered under three different climatic conditions. To evaluate the energy performance of various considered alternatives, the energy simulation of a base case building is evaluated in a computer environment. Using the validated model, the energy analysis is quantitatively performed, and cost-benefit analyses from the viewpoints of both residents and government are carried out based on the domestic and... 

    Statistical evaluation of using the new generation of wind turbines in South Africa

    , Article Energy Reports ; Volume 6 , November , 2020 , Pages 2816-2827 Mostafaeipour, A ; Jahangiri, M ; Haghani, A ; Hosseini Dehshiri, S. J ; Hosseini Dehshiri, S. S ; Sedaghat, A ; Saghaei, H ; Akinlabi, E. T ; Sichilalu, S. M ; Chowdhury, S ; Techato, K ; Issakhov, A
    Elsevier Ltd  2020
    Abstract
    In the view of the latest status and the potential of developing wind energy in South Africa, the present study aims to perform technical–economic–environmental analysis on a wind turbine system with HOMER software using the 20-years average data of the wind speed obtained from NASA's database, for providing the electricity to residential buildings. The results showed that the Port Elizabeth station, had the lowest levelized cost of electricity (LCOE) with the value of -0.363 $/kWh when using the EOLO wind turbine, and the Bloemfontein station had the highest LCOE with the value of 1.601 $/kWh when using the Turby wind turbine. The results from the step-wise assessment ratio analysis... 

    An approximate method to identify torsion caused by infill walls through geometric specifications of architectural plans

    , Article Journal of Building Engineering ; Volume 32 , 2020 Noorifard, A ; Tabeshpour, M. R ; Mehdizadeh Saradj, F ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    A significant part of torsional effects in buildings is due to disregarding the arrangement of infill walls during the design. This is a challenging issue since on the one hand the structural engineers do not usually consider infill walls in modeling a structure, while on the other hand the architects do not pay attention to the seismic behavior of infill walls during architectural design. In this research, an approximate method for identifying the torsion caused by infill walls was proposed to be used at the final stages of basic architectural design, which is based on the geometric specifications of architectural plans and does not require structural specifications. For this purpose,...