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عنوان فارسی مقاله:
بررسی تجربی عملکرد پارچه ها برای کاربردهای سرمایش تبخیری غیرمستقیم
عنوان انگلیسی مقاله:
Experimental investigation on performance of fabrics for indirect evaporative cooling applications
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Heating, ventilating, and air conditioning (HVAC) systems control the thermal comfort and air quality of buildings, and account for approximately 50% of the total electricity consumption of office buildings [1e5]. Against the background of global warming and the corresponding increasing demand for cooling, studies on HVAC system performance are gaining importance [6e9]. Two typical multiple zone system schemes are the constant air volume (CAV) and variable air volume (VAV) systems. Due to the long histories, both systems have been widely studied experimentally and numerically [10e12]. Overcooling is a significant problem for both systems [13e16]. Chen pointed out that overcooling is a common phenomenon in offices with air conditioning and mechanical ventilation (ACMV) systems in the tropics. The main contributors to this issue might include both human acclimatization as well as the current design of ACMV with VAV systems [17]. Summer overcooling is also common in the United States [13]. Edward et al. [14] surveyed six buildings in the Yahoo! campus during the warm season; they found that 37.4% of the population of 83 occupants felt slightly cool to cold. Aynur's study [15] revealed that because of overcooling, the VAV system with no-reheat boxes consumed approximately 30% more energy than the variable refrigerant flow (VRF) system, and the state of indoor thermal comfort worsened. Hoyt et al. [16] found that in both simulated and empirical cases with VAV systems, the zone airflow was very close to the minimum set point; further, in the simulated case, the zone was at the heating set point for approximately 70% of the operation time, indicating the high frequency of overcooling. Many studies have addressed the improvement of thermal environment and reduction of energy consumption. VAV systems and VRF systems were compared through simulation [15]; the study concluded that the indoor temperature could not be maintained properly by VAV without reheat boxes. However, VAV boxes with reheat boxes can offer better thermal environment with a significant energy consumption penalty [15]. Overall, the VRF AC system guarantees 27.1e57.9% energy-saving potentials [15]. The possibility of reducing the minimum airflow set points of the VAV box was studied [14,18]. Zhang et al. [18] found that when the minimum airflow is reduced from 30% to 20%, 40% of the reheat energy can be saved. Arens et al. [14] evaluated the thermal comfort of the occupants, air quality satisfaction, and energy consumption * Corresponding author. in operating buildings with both conventional and reducedminimum variable air volume flow set points, and determined the positive effect of lowering the minimum airflow set points. Meanwhile, many other potential methods to improve multiple zone AC systems were explored: for example, extending air temperature set points [15], occupancy-based energy-efficient climate control [19], and CO2-based dynamic reset with VAV box minimum airflow set points [20].
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کلمات کلیدی:
Green Material Prospects for Passive Evaporative Cooling Systems ... www.mdpi.com/1996-1073/9/8/586/pdf by Z Emdadi - 2016 - Related articles Jul 27, 2016 - The performance of evaporative cooling systems is governed by the material of the ... direct [22] and indirect [13] evaporative cooling applications. ...... with evaporative cooling by moving water film over external shade cloth. [PDF]Energy Performance of Indirect Evaporative Cooling in ... - Arrow@DIT arrow.dit.ie/cgi/viewcontent.cgi?article=1070&context=engschmeccon by B Costelloe - 2003 ENERGY PERFORMANCE OF INDIRECT EVAPORATIVE COOLING IN ... Evaporative cooling has had limited application in maritime, temperate, climates .... energy cooling strategies (such as night ventilation or fabric thermal storage), can ... Experimental investigation on performance of fabrics for ... - INFONA https://www.infona.pl/resource/bwmeta1.element.elsevier-48819e7d.../collections Experimental investigation on performance of fabrics for indirect evaporative cooling applications. Peng Xu, Xiaoli Ma, Xudong Zhao, Kevin S. Fancey. A Tool for Design Decision Making: Zero Energy Residential Buildings ... https://books.google.com/books?isbn=2875580590 Shady Attia - 2012 - Architecture Night ventilation and direct evaporative cooling are suggested for hot-dry climates, while natural ventilation and indirect evaporative cooling may be strategies ... to improve the cooling potential, control the cooling performance, and satisfy the ... Examples of these applications include slab radiant cooling with embedded ... EVAPORATIVE AIR CONDITIONING HANDBOOK - Springer Link link.springer.com/content/pdf/bfm%3A978-1-4613-2259-7%2F1.pdf Air conditioning boosts man's efficiency no less than his comfort. Air-conditioned ... Similarly boosted, indirect evaporative coolers, which cool air without wetting it, are spreading ... Southwest Boom and Uses, Temporary Decline, Recent Revival, New .... Textiles, Central Station Evaporative Cooling, Cooling Performance,. A Handbook on Low-Energy Buildings and District-Energy Systems: ... https://books.google.com/books?isbn=1136573038 L.D. Danny Harvey - 2012 - Architecture ... S. (2004) 'Ejectors: applications in refrigeration technology', Renewable and ... Ciampi, M., Leccese, F. and Tuoni, G. (2003) 'Ventilation facades energy performance in ... R. (2004) 'Solar and daylight availability Washington, in the urban fabric', ... pp578–585 Costelloe, B. and Finn, D. (2003a) 'Indirect evaporative cooling ...
