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Showing 3 results for Energy Consumption Optimization
The Effect of Dynamic Double Skin Façade on Energy Efficiency in Khayyam Administrative Building

Volume 12, Issue 2 (6-2022)
Abstract
Aims: The construction sector accounts for a large portion of the world's energy consumption; in Iran, it’s more than 40% of energy consumption. Office buildings have a relatively unfavorable energy consumption pattern due to impersonal ownership and lack of supervision and needs improvement. The aim of this research is to improve the energy performance of these buildings by using a dynamic double skin façade.

Materials and Methods: In this research, first the dominant pattern of office buildings in Mashhad has been studied. Since the design is done in Mashhad, which is one of the religious centers of the country, and to create this feeling in users, the pattern used in its second skin is inspired by Islamic patterns of tiles and decorations of the holy shrine of Imam Reza (AS). After analyzing the energy performance of 5 selected patterns with Ladybug and Honeybee plugins, the most optimal pattern is used.

Findings: Daylight is one of the most influential parameters in the design of energy efficient buildings. To make the most of this parameter, it is necessary to create facades with maximum transparency. But these facades face challenges such as overheating. Therefore, it’s important to control the amount of daylight entering.

Conclusion: In this research based on highperformance architecture theory, an optimal solution to improve the energy performance of a 5-storey office building in Mashhad by using a dynamic double skin façade with the ability to control the daylight entrance is presented; which results in a reduction in building’s energy consumption by approximately 130,000 kWh per year.
 
Investigating the effect of supply air temperature on thermal comfort and indoor air quality for a displacement ventilated room in summer
Mohammad Hassan Fathollahzadeh, Ghassem Heidarinejad, Hadi Pasdarshahri,
Volume 14, Issue 9 (12-2014)
Abstract
In this study, the effect of inlet supply temperature on energy consumption optimization, thermal comfort and mean local air age has been investigated for a displacement ventilation inside a typical room. Based on the results obtained from this study, an increase in the inlet supply temperature for a displacement ventilation from 17.8 to 25.8 in summer leads to a 50% reduction of consumed energy. Owing to the fact that optimization of consumed energy is an action bound to maintain thermal comfort of occupants, PMV(predicted mean vote) and PPD(predicted percentage of dissatisfied) parameters as two general thermal comfort indices have been investigated. In addition temperature gradient in vertical direction as local thermal discomfort index and mean local air age as air quality index have been probed. All the aforementioned indices except that of mean local air age, lie within the sightly range of ISO7730 standard with an increase in temperature, but air quality index experiences some quality drop in inhalation region, This slight drop is negligible and displacement ventilation system can be used as a suitable ventilation system for summer applications.
Technical-Economical Investigation and Comparison of Cooling and Heating Systems in Faculty of Engineering of Arak University
M. Sharjerdi, H. Safikhani,
Volume 19, Issue 12 (12-2019)
Abstract
In this article, technical-economical investigation of heating and cooling loads in faculty of engineering of Arak university, Iran has been investigated. The tradiational and modern conditioner systems such as CAV, VAV, fan coil systems (all three systems are tested with direct fired absorption chiller and screw chiller), VRF system, split system and evaporative cooling system (in total 9 different systems) are designed for this faculty and are compared technically-economically. In this article, the costs of water, electricity and gas, purchase of systems and equipment, maintenance and repair of equipment of the examined systems are calculated and are compared with each other and then this work is done in different cooling loads, so that the results are not limited to the technical faculty of Arak university and can be used for all existing systems throughout the country. In the end, it is shown, that the evaporative cooling system has the lowest current and initial cost among the other systems. however, since this systems do not have the ability to determination of the amount of humidity and ideal temperature for the desired space can not be considered as an ideal and standard system. Also it is shown, that the current and initial costs of compression chiller are less than of absorption chiller and VAV systems have the better performance than CAV and fan coil systems, and the VRF system, after the evaporative cooling system, has the lowest current and initial cost among the examined systems, especially the split system. Due to the intelligent and optimal control of this system, it can be selected as an ideal system.

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