Passive Downdraught Evaporative Cooling System Integration in Existing Residential Building Typologies: A Case Study

The weather of Iraq has longer summer season compared with other countries. The ambient temperature during this season reaches over 50 OC which makes the evaporative cooling system suitable for this climate. In present work, the two-stage evaporative cooling system is studied. The first stage is indirect evaporative cooling (IEC) represented by two heat exchangers with the groundwater flow rate (5 L/min). The second stage is direct evaporative cooling (DEC) which represents three pads with groundwater flow rates of (4.5 L/min). The experimental work was conducted in July, August, September, and October in Baghdad. Results showed that overall evaporative efficiency of the system (two coils with three pads each pad of 3cm) reach to 167 % with the temperature difference between ambient and supply is 26.2oC. While it reached 122.7% (one coil with three pads ) with the temperature difference between ambient and supply is 16OC and reduced to 84.88% and 84.36% for IEC and DEC respectively.

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Life Cycle Assessment of a compact Desiccant Evaporative Cooling system: The case study of the “Freescoo”

Solar Energy Materials and Solar Cells ◽

10.1016/j.solmat.2016.03.026 ◽

2016 ◽

Vol 156 ◽

pp. 83-91 ◽

Cited By ~ 19

Author(s):

Pietro Finocchiaro ◽

Marco Beccali ◽

Maurizio Cellura ◽

Francesco Guarino ◽

Sonia Longo

Keyword(s):

Life Cycle Assessment ◽

Life Cycle ◽

Cooling System ◽

Evaporative Cooling ◽

Evaporative Cooling System

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Analysis of the Performance of a Passive Downdraught Evaporative Cooling System Driven by Solar Chimneys in a Residential Building by Using an Experimentally Validated TRNSYS Model

Energies ◽

10.3390/en14123486 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3486

Author(s):

Andrés Soto ◽

Pedro Martínez ◽

Victor M. Soto ◽

Pedro J. Martínez

Keyword(s):

Natural Ventilation ◽

Energy Savings ◽

Cooling System ◽

Evaporative Cooling ◽

Residential Building ◽

Climatic Conditions ◽

Cold Climate ◽

Humid Climate ◽

Combined Model ◽

Evaporative Cooling System

Natural ventilation, combined with a passive cooling system, can provide significant energy savings in the refrigeration of indoor spaces. The performance of these systems is highly dependent on outdoor climatic conditions. The objective of this study was to analyse the feasibility of a passive, downdraught, evaporative cooling system driven by solar chimneys in different climatic zones by using an experimentally validated simulation tool. This tool combined a ventilation model and a thermal model of the dwelling in which an empirical model of a direct evaporative system made of plastic mesh was implemented. For experimental validation of the combined model, sensors were installed in the dwelling and calibrated in the laboratory. The combined model was applied to Spanish and European cities with different climates. In the simulation, values of cooling energy per volume of air ranging between 0.53 Wh/m3 and 0.79 Wh/m3 were obtained for Alicante (hot climate with moderate humidity) and Madrid (hot and dry climate), respectively. In these locations, medium and high applicability was obtained, respectively, in comparison with Burgos (cold climate with moderate humidity) and Bilbao (cold and humid climate), which were low. The evaluation of the reference building in each location allowed establishing a classification in terms of performance, comfort and applicability for each climate.

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Feasibility of Reducing Electricity Consumption of Air Conditioning Equipment by Condenser Direct Evaporative Cooling Technology. Example of Case Study in Dubai

Atmosphere ◽

10.3390/atmos12091205 ◽

2021 ◽

Vol 12 (9) ◽

pp. 1205

Author(s):

Anatolijs Borodinecs ◽

Kristina Lebedeva ◽

Aleksejs Prozuments ◽

Arturs Brahmanis ◽

Aldis Grekis ◽

...

Keyword(s):

Air Conditioning ◽

Cooling System ◽

Evaporative Cooling ◽

Electricity Consumption ◽

Air Cooling ◽

Additional Energy ◽

Direct Evaporative Cooling ◽

Evaporative Cooling System ◽

Cooling Technology

The use of air conditioning technology is accompanied by an increase in electricity consumption, which is linked to an intensification of fossil fuel extraction. This in turn calls for developing cooling solutions of higher energy efficiency. The aim of this study is to examine energy consumption reduction of direct evaporative cooling technology for generating cool air in hot-dry climate regions. At the initial stage, already-installed air cooling equipment with a direct evaporative cooling system was studied for the creation of two regression models of electricity consumption representing the “on” and “off” sequences. Water consumption for system operation was taken into consideration. In the following stage, inlet water temperature dependence for pre-cooling purposes for the direct evaporative cooling system was studied. A mathematical model was developed and the subsequent calculations suggested that there is no need to pre-cool water before it enters the system and therefore consume additional energy. Practical application of this study is evaluated based on the case study in Dubai. The results of this study present significant energy saving potential for system operations of the direct evaporative cooling system of approximately 122 MWh per year. The return on investment for the equipment with direct evaporative cooling in case of an office building in Dubai featuring a hot desert climate is around 4.2 years. The purpose of this study is to examine the potential advantage of air cooling equipment with direct evaporative cooling technology compared to cooling equipment without this technology. The results provide the expediency of conducting further research in this area, in particular with regards to analyzing various materials for the adiabatic precooling pads, as well as the possibility of using a newly developed metal precooling pad.

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