جستجوی مقالات مرتبط با کلیدواژه « cooling load » در نشریات گروه « برق »

Air conditioning systems account for a significant portion of electricity consumption in buildings. Therefore, the use of new technologies to reduce electricity consumption is essential for engineers and researchers. In this research, an ice storage system in combination with the air conditioning system of an office building has been investigated to reduce the electrical energy consumption of the air conditioning system. For this purpose, a building in Chabahar-Iran (as a region with a high cooling load required region) is considered. The building is simulated in TRNSYS software at the existing condition as well as with the added ice storage system to predict the performance of the systems. The study shows that ice storage system is more efficient in the partial load strategy than other examined strategies. It was also found that by using an ice storage system the total electricity consumption could be reduced about 37.89%, and the new system was able to transfer 37.9% of energy consumption from peak load hours to medium and low load hours. Economically, it is proved that by employing the ice storage system in the partial load strategy, a significant amount of reduction in electricity bill, about 62%, can be achieved.

Reducing building energy consumption is one of the sustainable architecture principles. Since nearly half of consumed energy in the buildings is lost through windows, many studies have been conducted to find solutions for energy conservation and solar radiation control. Application of electrochromic smart glass is one of those solutions. In order to have optimum building selection, the evaluation of the effectiveness of this type of glasses in various climates in Iran is necessary. So far no research has been conducted on this issue. In the present study, the effect of using electrochromic smart glass on the cooling load of an office building is investigated in three cities of Bushehr (with hot-humid climate), Shiraz (with hot-dry climate), and Tabriz (with cold climate). For this purpose, a three-storey office building is simulated in Design Builder software and the annual cooling load of the building is calculated in three modes with 6mm plain glass, double-glazed glass and electrochromic smart glass. The results show that in Bushehr, Shiraz, and Tabriz, the application of electrochromic glass has a significant effect on the reduction of cooling load and, thus, is appropriate. In Bushehr, the application of electrochromic glass has reduced the cooling load of the building by 19% and 8% compared with the ordinary glass and the double-glazed one, respectively. In Shiraz and Tabriz, the cooling load also decreases by 28% and 10%. These results show that the efficiency of electrochromic glass in hot-dry and cold climate is higher than hot-humid climate.

Energy as one of the major issues of concern to human society in many countries and saving energy is important. Energy consumption in the country buildings as a non-productive part, are located the largest share among all consumer segments. A series of factors that determines the amount of energy consumption in buildings can be classified as follows: 1- Weather conditions and climate of building construction site. 2- Materials used on the external walls of the building. 3- Architectural and structural building. 4- Central Utility Building (heating, cooling, ventilation and lighting). 5- Consumer equipment (electrical appliances and office equipment). In this project I will audit a building in a given geographical conditions in terms of cooling load, In order compute Q refrigerating, then obtain the sensible colling load.

Motorized shades have a considerable impact on energy demand reduction of building, combining it with lighting systems and PV panels will make it more effective. In this article, three shade design, two lighting control system (on/off, dimming) and the option of using PV cells in shades have been investigated. The best combination of above cases which maximizes annual electrical energy saving and minimizes return on investment’s time is found. Annual saving is calculated using hourly simulation of lighting, solar heat flux and electricity generation. Results showed that the optimum combination have the saving potential of 792kwh annually.