Create comfort conditions in building by using a hybrid passive cooling system

Subject Areas : Architecture and urbanism

Mahnoosh  Eghtedari ¹ (PhD Student, Architecture Department, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.)
Abbas  Mahravan ² (Assistant Professor, Architecture Department, Razi University, Kermanshah, Iran. *(Corresponding author))
Maryam  Ansarimanesh ³ (Assistant Professor, Department of Architecture, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.)
ali  nouri ⁴ (Assistant Professor, Department of Architecture, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.)

Received: 2019-01-28 Accepted : 2019-07-17 Published : 2021-06-22

Keywords: Passive cooling system, Solar Chimney, Windcatcher, Evaporative Cooling Cavity,

Abstract :

Background and Objectives: Increasing fossil fuel consumption in the building, especially in the air conditioning sector, has increased environmental pollution and global warming.In this research, a zero-energy passive system was designed in a warm and dry climate to ventilate the building and provide comfortable conditions for people in the summer. This Hybrid Passive Cooling System (HPCS) includes two distinctive systems: the Solar Chimney (SC) and Evaporative Cooling Cavity (ECC).Method: This research experimental-analytical and simulation studied and tested the ability of the system in cooling the building in the warmest month of the year from 9: 00 am to 3:00 pm for ten consecutive days. The air temperature, humidity, and ambient air velocity were measured at the outlet of the evaporative cooling channel and the inlet of the solar chimney.Findings: The findings showed this system could reduce the air temperature by an average of 10  and could increase the air humidity by 34%. Moreover, the air velocity of the SC increased as the air got warm so that the maximum inlet air velocity in the solar chimney reached the highest level (2.8) at 3 pm. In addition. Since the outlet air velocity of the windcatcher rose to 0.41  at 3:00 pm compared to 9:00 am, which is equivalent to an air temperature drop of 3.6, the chamber was in comfort condition by using the hybrid system at 3:00 pm.Discussion and Conclusion: The results show that using a passive hybrid system, the chamber is in comfortable condition from 9:00 am to 3:00 pm. Calculating the cost of constructing and installing a hybrid passive system and comparing it with a water cooler indicates that the proposed is profitable since used, and the return time of the system after running and launching the system.With an increase in the number of people from 1 to 4 people, the room is in comfortable conditions at 9 am and noon, but at 3 pm the room is placed with 4 people out of the comfort zone.

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