Design and evaluation of passive downdraft cooling systems: outcomes from built prototypes of single stage and hybrid downdraft cooling towers

Al-Hassawi, Omar Dhia

doi:10.1080/00038628.2020.1731677

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The author measured the first stage of cooling air by using sensible cooling and the second stage by using direct evaporative cooling. The results indicated that a hybrid tower functions to ensure comfort conditions in hot-dry conditions when evaporative cooling operates and also during hot-humid conditions when it is made functional without evaporative cooling [6].…”

Section: Table 1 Comparative Analysis Of the Literature Review With T...mentioning

confidence: 99%

Traditionally Originated Modern Technology Motivated Passive Downdraft Cooling System: An Eco-friendly Triple Harvest Solution

Bhatia

2024

IOP Conf. Ser.: Earth Environ. Sci.

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With rising heat waves and climate change, the big cities are meshing up with the buildings woven in urban fabric that are becoming power-guzzling air-conditioning machines that increase energy demand multi-fold. This has the side effect of heating up the environment because the return heat from air conditioners mixes with the surrounding air. This dents the microclimate and makes the micro and macro systems worse, as this process is continuous without break. So it will be a disaster for the environment in the future. To mitigate the problem, the paper borrows traditional wisdom to merge with smart technology and create comfortable built spaces in hot-dry and hot-humid weather conditions, based on the principles of evaporative cooling, the venturi effect, and the faraday law of electromagnetic induction. The output of adopting these principles creates comfort conditions for air ventilation with improved air quality and a natural air-conditioning system, ensuring the luxury of contact-free cool air in habitable spaces. The process is based on interoperability, which is built into the system to self-generate and consume renewable energy. The integration of information into the system is a spontaneous cycle of production and consumption of energy. This ensures its self-sufficiency, which bridges the research gap in the design of an upgraded passive downdraft cooling system with three self-sufficient and effective benefits in a single system.

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Section: Table 1 Comparative Analysis Of the Literature Review With T...mentioning

confidence: 99%

Traditionally Originated Modern Technology Motivated Passive Downdraft Cooling System: An Eco-friendly Triple Harvest Solution

Bhatia

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The chamber should be capable of reproducing the temperatures, humidity levels, and air velocities recorded from PDECT full-scale prototype datasets [25], allowing chamber characterization and calibration of reduced-scale prototype data.…”

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confidence: 99%

Innovations in Passive Downdraft Cooling Performance Evaluation Methods: Design and Construction of a Novel Environmental Test Chamber

Al-Hassawi

Drake

2023

Energies

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Energy demand for active mechanical space cooling is projected to double by 2050. Wider adoption of passive cooling systems can help reduce demand. However, familiarity with these systems remains low, and innovation in the field is constrained due to a lack of cost-effective, accessible performance evaluation methods. This paper reports the design, construction, and commissioning of an affordable, self-contained environmental test chamber. The novel chamber replicates a range of outdoor conditions common in hot, dry regions, making possible year-round testing of reduced-scale prototypes. Data from calibration testing are reported, showing no significant difference in evaporative efficiency when a reduced-scale prototype tested in the chamber is compared with datasets from prior full-scale testing. Analyzing the results using an independent sample two-tailed t-test with a 95% confidence interval found a p-value of 0.75. While measured outlet air velocities for reduced-scale and full-scale prototypes differed to some extent (root mean square error of 0.45 m/s), results were nevertheless deemed comparable due to errors introduced by the rapid change in wind speeds and directions at full scale. Future chamber modifications will correct misalignments between data collected from the two scales and prevent observed increases in the chamber’s relative humidity levels during testing.

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2022

Design and Construction of Bioclimatic Wooden Greenhouses 1

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Design and evaluation of passive downdraft cooling systems: outcomes from built prototypes of single stage and hybrid downdraft cooling towers

Cited by 4 publications

References 2 publications

Traditionally Originated Modern Technology Motivated Passive Downdraft Cooling System: An Eco-friendly Triple Harvest Solution

Traditionally Originated Modern Technology Motivated Passive Downdraft Cooling System: An Eco-friendly Triple Harvest Solution

Innovations in Passive Downdraft Cooling Performance Evaluation Methods: Design and Construction of a Novel Environmental Test Chamber

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