Energy saving potential of an indirect evaporative cooler as a pre-cooling unit for mechanical cooling systems in Iran

Delfani, Shahram; Esmaeelian, Jafar; Pasdarshahri, Hadi; Karami, Maryam

doi:10.1016/j.enbuild.2010.07.009

Cited by 143 publications

(37 citation statements)

References 7 publications

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“…The indirect evaporative cooling is a similar process but using a heat exchanger (permeable wall) between the air flow and the cooled air, allowing the air inside a room to cool down without increasing its humidity, therefore decreasing the eventual condensation and the consequent release of heat into the room [12]. The evaporative cooling techniques have been largely studied and its efficiency has been shown both from technical and economical stand points [13][14][15][16]. It is expected that the indirect evaporative cooling systems will take up 20% of the air-conditioning market in buildings in the next 20 years in particular for the dry and hot climes [17].…”

Section: State Of the Artmentioning

confidence: 99%

Assessing energy savings in cooling demand of buildings using passive cooling systems based on ventilation

2014

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The objective of this article is to develop and test a simplified method to compute the savings in building cooling demand by use of passive cooling systems based on ventilation (direct night ventilation, air-soil heat exchangers, controlled thermal phaseshifting, evaporative cooling, as well as possible combinations thereof). The systems are characterized in terms of a climatic cooling potential, independently of any building, which is then compared to the cooling load of a particular building. The method is tested against an extensive numerical simulation campaign, combining diverse passive cooling systems and sizes with diverse constructive and operational modes for an administrative building situated in Geneva. The key point of the simplified method is to choose an appropriate time resolution, for taking into account the building thermal inertia. Although best results are obtained with a daily resolution, good results are also obtained with monthly data, where an overestimation of the passive cooling fraction remains less than 20% in half of the cases. This opens way for using the method for first assessing the potential of these passive cooling techniques on a large spatiotemporal scale, for which integrated building and system simulation becomes prohibitive.

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Section: State Of the Artmentioning

confidence: 99%

Assessing energy savings in cooling demand of buildings using passive cooling systems based on ventilation

2014

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“…In the case of indirect evaporative 4 cooling, the cooled humidified air is forced into a heat exchanger maintaining its levels of humidity and at the same time decreasing its temperature and lowering the risk of condensation [15]. Evaporative cooling techniques have been proved feasible both from economic and technical stand points through numerous studies [16][17][18][19], nevertheless their efficiency can dramatically be reduced in the case of hot humid climates. Nonetheless, it is expected that indirect evaporative cooling systems will represent near 20% of air-conditioned market in buildings over the next 20 years world-wide [20].…”

Section: Direct Ventilation and Evaporative Coolingmentioning

confidence: 99%

Climatic cooling potential and building cooling demand savings: High resolution spatiotemporal analysis of direct ventilation and evaporative cooling for the Iberian Peninsula

et al. 2016

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In the present study a new methodology allowing the assessment of building´s cooling demand savings by the use of ventilated passive cooling systems is presented in a twofold innovative way. Firstly, using a redefined concept of the climatic cooling potential (CCP), which allows for the direct estimation of savings in building´s cooling demand by the use of different passive cooling systems on a large spatiotemporal scale. Secondly, this assessment relies on high resolution climate dataset built using a regional climate model covering the Iberian Peninsula (IP) with a 9km horizontal spacing and the period between 1989 and 2008. Here, the CCP concept is applied for direct ventilation and evaporative cooling, in such a way that it allows for a comparison with the building monthly cooling demand, providing a direct assessment on the cooling demand savings for any building, for three air flow rates. The results show that CCP is asymmetrically distributed both spatially and temporally within the IP. During the cooling season CCP values are above 1kWh per m 3 of building and 3kWh per m 3 of building, for direct ventilation and evaporative cooling, respectively. Evaporative cooling provides a less heterogeneous annual cycle of CCP than direct ventilation, with a relative difference in the south and central part of the Iberian Peninsula superior to 100% during summer. Nonetheless, despite the consistently higher values offered by evaporative cooling, in the coastal regions the relative difference between the two systems drops to less than 10% due to the higher moisture in the air.For the case of a typical office room in the region of Lisbon, in the month of August, the cooling demand savings provided by the use of direct ventilation and evaporative cooling can represent more than 27% and 40% of the cooling demand, respectively.2 Abstract (Shortened to not exceed 200 words)In the present study a new methodology allowing the assessment of building´s cooling demand savings by the use of ventilated passive cooling systems is presented in a twofold innovative way. Firstly, using a redefined concept of the climatic cooling potential (CCP). Secondly, this assessment relies on high resolution climate dataset built using a

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“…A combined experimental plant consisting of an IEC unit and a packaged unit air conditioner was realized and tested by Delfani et al [7]; they found a reduction in cooling load up to 75% and a reduction in electrical energy consumption around 55% during cooling season.…”

Section: Introductionmentioning

confidence: 99%

Energy savings evaluation for dry-cooler equipped plants in shopping mall buildings

Angelis¹,

Ceccotti²,

Saro³

2017

IJHT

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In the present paper the possible energy savings achievable by means of dry coolers adoption in cooling plants serving shopping mall buildings has been carried out. In these buildings, could happens that, due to internal gains caused by occupancy, lighting, and electrical devices, or because of solar radiation entering through the large skylights on the aisle, some zones have to be cooled also during the middle and the winter seasons. The aim of this work is the evaluation of the energy saving, reachable when a water indirect free cooling system is integrated into a traditional cooling equipment in a shopping mall. Depending on outside climate conditions, the dry-cooler units could be used alternatively to cool down the refrigerant flow, or the water supplied to fan coils, achieving in such a way an indirect free cooling; so, the proposed system allows to turn off the chiller. By means of energy simulations, electrical energy saving in different locations has been evaluated. Simulations results allowed a comparison between a traditional plant and a plant equipped with a dry-cooler. These simulations were useful to evaluate the influence of weather conditions in the dry cooler integration convenience.

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Energy saving potential of an indirect evaporative cooler as a pre-cooling unit for mechanical cooling systems in Iran

Cited by 143 publications

References 7 publications

Assessing energy savings in cooling demand of buildings using passive cooling systems based on ventilation

Assessing energy savings in cooling demand of buildings using passive cooling systems based on ventilation

Climatic cooling potential and building cooling demand savings: High resolution spatiotemporal analysis of direct ventilation and evaporative cooling for the Iberian Peninsula

Energy savings evaluation for dry-cooler equipped plants in shopping mall buildings

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