scholarly journals CFD EVALUATION OF THE POTTERY WATER WALL IN A HOT ARID CLIMATE OF LUXOR, EGYPT

2014 ◽  
Vol 9 (4) ◽  
pp. 175-189 ◽  
Author(s):  
Moustafa Anwar Moustafa ◽  
Srazali Aripin
Keyword(s):  
Thermal Comfort ◽  
Cfd Simulation ◽  
Porous Ceramic ◽  
Evaporative Cooling ◽  
Climatic Conditions ◽  
Arid Climate ◽  
Passive System ◽  
Water Wall ◽  
Hot Arid Climate ◽  
Cooling Ability

This paper aims to evaluate the Pottery Water Wall in a hot arid climate using CFD simulation. The Pottery Water Wall is a passive system and an upgrade to the Water Wall. The Pottery Water Wall is a combination of a Water Wall and Porous Ceramic Pipes for evaporative cooling. First, the study will evaluate the efficiency of the Pottery Water Wall in cooling and heating in the most extreme climatic conditions of winter and summer in Luxor, Egypt. This study will aid determining the ability of the Pottery Water Wall to cool and heat buildings and its ability to achieve thermal comfort. The study found that the Pottery Water Wall's cooling ability ranges between 4°C to 10°C, while its heating ability ranges between 4°C to 15°C. The Pottery Water Wall achieved thermal comfort for 62.5% of a day resembling extreme summer and achieved thermal comfort 62.5% of a day resembling extreme winter. In conclusion, the Pottery Water Wall can reduce cooling and heating demand by 88% at the extreme climatic conditions of Luxor, Egypt.

scholarly journals Evaporative Cooling Options for Building Air-Conditioning: A Comprehensive Study for Climatic Conditions of Multan (Pakistan)

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3061 ◽  
Author(s):  
Shazia Noor ◽  
Hadeed Ashraf ◽  
Muhammad Sultan ◽  
Zahid Mahmood Khan
Keyword(s):  
Thermal Comfort ◽  
Co2 Emissions ◽  
Air Conditioning ◽  
Evaporative Cooling ◽  
Cooling Capacity ◽  
Climatic Conditions ◽  
Maximum Temperature ◽  
Human Thermal Comfort ◽  
Work Input ◽  
System Configurations

This study provides comprehensive details of evaporative cooling options for building air-conditioning (AC) in Multan (Pakistan). Standalone evaporative cooling and standalone vapor compression AC (VCAC) systems are commonly used in Pakistan. Therefore, seven AC system configurations comprising of direct evaporative cooling (DEC), indirect evaporative cooling (IEC), VCAC, and their possible combinations, are explored for the climatic conditions of Multan. The study aims to explore the optimum AC system configuration for the building AC from the viewpoints of cooling capacity, system performance, energy consumption, and CO2 emissions. A simulation model was designed in DesignBuilder and simulated using EnergyPlus in order to optimize the applicability of the proposed systems. The standalone VCAC and hybrid IEC-VCAC & IEC-DEC-VCAC system configurations could achieve the desired human thermal comfort. The standalone DEC resulted in a maximum COP of 4.5, whereas, it was 2.1 in case of the hybrid IEC-DEC-VCAC system. The hybrid IEC-DEC-VCAC system achieved maximum temperature gradient (21 °C) and relatively less CO2 emissions as compared to standalone VCAC. In addition, it provided maximum cooling capacity (184 kW for work input of 100 kW), which is 85% higher than the standalone DEC system. Furthermore, it achieved neutral to slightly cool human thermal comfort i.e., 0 to −1 predicted mean vote and 30% of predicted percentage dissatisfied. Thus, the study concludes the hybrid IEC-DEC-VCAC as an optimum configuration for building AC in Multan.

scholarly journals Investigating Applicability of Evaporative Cooling Systems for Thermal Comfort of Poultry Birds in Pakistan

2020 ◽  
Vol 10 (13) ◽  
pp. 4445
Author(s):  
Hafiz M. U. Raza ◽  
Hadeed Ashraf ◽  
Khawar Shahzad ◽  
Muhammad Sultan ◽  
Takahiko Miyazaki ◽  
...  
Keyword(s):  
Heat Stress ◽  
Thermal Comfort ◽  
Developing Economies ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Ambient Air ◽  
Climatic Conditions ◽  
Maximum Temperature ◽  
Poultry Birds ◽  
The City

In the 21st century, the poultry sector is a vital concern for the developing economies including Pakistan. The summer conditions of the city of Multan (Pakistan) are not comfortable for poultry birds. Conventionally, swamp coolers are used in the poultry sheds/houses of the city, which are not efficient enough, whereas compressor-based systems are not economical. Therefore, this study is aimed to explore a low-cost air-conditioning (AC) option from the viewpoint of heat stress in poultry birds. In this regard, the study investigates the applicability of three evaporative cooling (EC) options, i.e., direct EC (DEC), indirect EC (IEC), and Maisotsenko-cycle EC (MEC). Performance of the EC systems is investigated using wet-bulb effectiveness (WBE) for the climatic conditions of Multan. Heat stress is investigated as a function of poultry weight. Thermal comfort of the poultry birds is calculated in terms of temperature-humidity index (THI) corresponding to the ambient and output conditions. The heat production from the poultry birds is calculated using the Pederson model (available in the literature) at various temperatures. The results indicate a maximum temperature gradient of 10.2 °C (MEC system), 9 °C (DEC system), and 6.5 °C (IEC systems) is achieved. However, in the monsoon/rainfall season, the performance of the EC systems is significantly reduced due to higher relative humidity in ambient air.

Evaluating the effectiveness of outdoor evaporative cooling in a hot, arid climate

2019 ◽  
Vol 150 ◽  
pp. 281-288 ◽  
Author(s):  
Jay Dhariwal ◽  
Prajowal Manandhar ◽  
Lindita Bande ◽  
Prashanth Marpu ◽  
Peter Armstrong ◽  
...  
Keyword(s):  
Evaporative Cooling ◽  
Arid Climate ◽  
Hot Arid Climate

scholarly journals Effect of the Evaporative Cooling on the Human Thermal Comfort and Heat Stress in a Greenhouse under Arid Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
A. M. Abdel-Ghany ◽  
I. M. Al-Helal ◽  
M. R. Shady
Keyword(s):  
Heat Stress ◽  
Thermal Comfort ◽  
Thermal Sensation ◽  
Evaporative Cooling ◽  
Climatic Conditions ◽  
Human Thermal Comfort ◽  
Solar Radiation Flux ◽  
Different Types ◽  
Greenhouse Workers ◽  
Globe Temperature

Thermal sensation and heat stress were evaluated in a plastic greenhouse, with and without evaporative cooling, under arid climatic conditions in Riyadh, Saudi Arabia. Suitable thermal comfort and heat stress scales were selected for the evaluation. Experiments were conducted in hot sunny days to measure the required parameters (i.e., the dry and wet bulb temperatures, globe temperature, natural wet bulb temperature, and solar radiation flux) in the greenhouse. The results showed that in the uncooled greenhouse, workers are exposed to strong heat stress and would feel very hot most of the day time; they are safe from heat stress risk and would feel comfortable during night. An efficient evaporative cooling is necessary during the day to reduce heat stress and to improve the comfort conditions and is not necessary at night. In the cooled greenhouse, workers can do any activity: except at around noon they should follow a proposed working schedule, in which the different types of work were scheduled along the daytimes based on the heat stress value. To avoid heat stress and to provide comfort conditions in the greenhouses, the optimum ranges of relative humidity and air temperature are 48–55% and 24–28°C, respectively.

Sign in / Sign up

Export Citation Format

Share Document