Journal of Construction Engineering, Management & Innovation - Golden Light Publishing ® | Trabzon

Journal of Construction Engineering, Management & Innovation

ARTICLES

Semra Comu Zehra Kural Busra Yucel

The real estate industry holds a remarkably significant share in the Turkish economy. Due to the nature of the dynamic characteristics of the real estate industry, project achievement is not an easy task. Choosing the appropriate Project Delivery Method (PDM) is significantly crucial, considering that it provides various benefits, including economic contribution and time-saving. This study aims to determine the main factors affecting PDM selection with the most suitable analysis method for real estate projects in Turkey. The PDM types used in the real estate sector and the factors affecting the appropriate PDM selection process are identified based on literature review and interviews with professionals related to the Turkish real estate industry. The model generated is utilized as a tool in choosing the appropriate PDM in real estate projects by using Fuzzy Analytical Hierarchy Process (AHP). In terms of the theoretical contribution to the literature, this study identifies five main factors categorized as i) time-related issues, ii) cost, funding and cash flow related issues, iii) scope related issues, iv) owner organization, risk, and relationship related issues, and vi) project characteristic issues with 13 sub-factors. In addition to the theoretical contribution, a hierarchical model and a Fuzzy AHP based approach to select the appropriate PDM for the real estate projects in Turkey are provided as a practical contribution.

https://doi.org/10.31462/jcemi.2020.04249263


Tuğçin Krant Hatice Sözer

Energy performance and heat flux of a traditional heating system, called Russian masonry stove, was analyzed with a comparative study based on its original S-shaped chimney design and high specific heat value firestone material. The study aims to improve building energy performance by taking advantage of traditional techniques. The paper was structured within three stages; architectural modeling of the stove, to identify and understand the architecture of the system, energy performance modeling of the stove, to specify the system performance and CFD modeling of the stove, to analyze the system’s performance influence on indoor comfort conditions. Results were compared with the steel casting straight chimney stove which commonly used in contemporary architecture. The results showed that the influence of the Russian stove’s unique specifications enabled acquiring a better level of desired indoor comfort conditions. The installation of the Russian stove to the contemporary buildings would be suggested in respect of providing the level of thermal comfort and energy performance

https://doi.org/10.31462/jcemi.2020.04264274


Rakibul Hasan Jewel Rana

Thermal insulation plays a significant role in reducing cooling load as well as energy consumption for air conditioning of an office building in the context of subtropical monsoon climate of Bangladesh because a huge amount of heat gain occurs through building envelope in tropical climatic regions. Although the thermal insulation into the building envelope decreases the heat gain and energy consumption, the existing literature lacks in representing the quantitative measurement of the impact of thermal insulation on the energy consumption in the context of Bangladeshi climate. This study investigates the quantitative impact of thermal insulation on energy consumption of an existing commercial bank. The entire research was carried out from the perspective of energy simulation of a real existing commercial buildings using the Building Information Modeling (BIM) and Building Energy Modeling (BEM) tools. Numerous design alternatives have been developed using different types of building envelope materials for energy simulation. An extensive data analysis of simulation results was conducted to predict the quantitative impact of thermal insulation on energy consumption. This study concludes that the studied building can save 13% energy consumption annually and throughout the lifecycle by incorporating fiberglass thermal insulation and double-glazing lowe windows into the external facades of the building. The output of this work can add new knowledge to the Bangladeshi construction sector about the energy-saving potentiality of thermal insulation that has not prevailed before.

https://doi.org/10.31462/jcemi.2020.04275292


Guzin AYDOGAN

Joint ventures have been on the agenda of international contractors for the last few decades. Managing international construction joint ventures (ICJVs) and the performance of ICJVs has become the main subjects that researchers focused on after 2000. It is not possible to make the definition of ICJVs in a traditional way. That’s why; the aim of this study is to make a contribution to the vague definition of ICJVs by using Ludwig Wittgenstein’s family-resemblance theory as a method. Wittgenstein supposed that it is possible to understand a complex concept as a network of overlapping similarities. Researchers have applied Wittgenstein’s family-resemblance theory to partnering, alliancing and relational contracting in construction. Similar to those studies, this study provides an innovative method to define vague concept of ICJVs by using Wittgenstein’s idea of family resemblance theory. Components of ICJVs that were determined through an intensive literature review are used in this study in order to make a comprehensive definition. Finally, it was stated that combinations of these components differ to due cases after applying the sunflower model to three international aviation projects. The contribution of this innovative definition can be useful for both industrial practitioners and researchers, since it provides a flexible and structured way to discuss the multifaceted concept of ICJVs. In the procurement phase of an ICJV, professionals may use sunflower model in order to understand the differential dynamics of the venture. The model will also be a tool for defining the specific components of each venture and a common starting point for discussions between partners, thus avoiding any misinterpretations of what an ICJV is.

https://doi.org/10.31462/jcemi.2020.04293304


Ümit Bahadır Xhensila Thomollari Sibel Maçka Kalfa Vedat Toğan

Due to the increasing energy consumption in the world, energy efficiency has become the most important issue in sectors with high energy use such as industry, transportation, agriculture and construction. In many countries, the energy consumed in housing composes a large part of the total energy consumption. In Turkey, about 20% of total energy consumption is utilized in residential buildings and about 60% of this energy is used for heating. The energy consumed in residence buildings can be reduced by measures to decrease the heating and cooling loads. For this purpose, the main objective of this study is to investigate the effect of ventilated walls on the energy and cost performance of buildings. The energy and cost efficiency of 29 different ventilation walls with 3 different insulation thicknesses, 3 different ventilation gap thicknesses and 3 different cladding materials were compared with the reference wall. For a family of 3, a flat with a 2 + 1 plan was chosen for investigation and the flat is located in Trabzon, which represents the moderate-humid climate region. Flat plans with different ventilated walls were modeled using DesignBuilder energy simulation software and monthly/annual heating and cooling loads were obtained. Then, life cycle cost analysis has been conducted to investigate the cost effective ventilated wall types. Although the high initial investment costs of the investigated ventilated walls increase the life cycle costs, it has been observed that they provide energy savings in buildings.

https://doi.org/10.31462/jcemi.2020.04305318