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عنوان فارسی مقاله:
بررسی تجربی بر روی 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
The current air conditioning market is dominated by mechanical vapour compression systems, which are energy intensive and suffer from poor thermal performance in hot climate conditions. Hence, there is a renewed interest in the use of evaporative cooling for thermal comfort in buildings [1]. This cooling method utilises the principle of water evaporation for absorbing heat existing in ambient, therefore, consuming much lower electricity compared to mechanical compression system. Direct evaporative cooling system and indirect evaporative cooling system are two types of evaporative cooling systems commonly used nowadays [2]. Direct evaporative cooling systems can lower the temperature of air using the latent heat of evaporation. As a result, warm dry air is changed into cool moist air. Indirect evaporative cooling systems have the advantage of being able to lower the air temperature without increasing humidity of the conditioned space and avoid potential health issues from contaminated water droplets entering occupied spaces (as associated with direct evaporative cooling systems) [3]. Thermodynamically, an indirect evaporative air cooler passes the primary (product) air over the dry side of a heat/mass exchanging wall, and the secondary (working) air over its opposite wet side. The wet side absorbs heat from the dry side by evaporating water and therefore cooling air from dry side, while the latent heat from vaporising water is given to air on the wet side [4]. Fig. 1 shows the principle of direct and indirect evaporative cooling. As a result of the above mentioned advantage from indirect evaporative cooling, its use has recently become widespread in evaporative air conditioning. The evaporative air cooler is sample and compact. A typical indirect evaporative cooler is constructed of a heat and mass exchanger, fans, a water distributor/a water basin and a small water pump. Usually all the components can be accommodated into a cuboid envelop (casing) with an air inlet (for fresh air intaking) and two air outlets (exhaust air outlet and product air outlet respectively). The cooler can be integrated in buildings very easily, e.g. putting in an utility room in the house, in any room closing to a wall, on the roof of a buildings, or outside the buildings attached to a wall. All we need to do is to connect the air inlet to the outdoor fresh air, exhaust air outlet to outside buildings and product air outlet to the rooms to be cooled through ducts, which may need to make appropriate holes in the wall or/and ceiling of the buildings. Researches studies into improving the performance of indirectevaporative cooling are numerous. In addition to developing new types of heat and mass exchangers which aims to enhance the heat and mass transfer rates by optimising the geometry of the heat and mass exchangers [2,3,5e7], research has also focused on the heat and mass exchanger medium (wet surface material) [8e15]. This is because the properties of the heat/mass exchanging medium, i.e. its moisture wicking ability, diffusivity and evaporation ability, can greatly affect the wetted area as well as the moisture diffusion and evaporation rate, and therefore affect cooling efficiency and performance of evaporative cooling systems.
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کلمات کلیدی:
Sampling of soil and rock - Page 86 - Google Books Result https://books.google.com/books?id=vsXkO7nY2HoC 1971 ... on strength, fabric has an important indirect influence, and it is not adequate to divide our description of ... One has to superimpose the essential details of the fabric. ... are described and illustrated how can we consider the interpretation of its performance? ... But if this knowledge is complete, why conduct an investigation? Phenomenology and The Ghost in The Machine: An Investigation into ... https://books.google.com/books?isbn=1365603318 Timb Hoswell It is worth noting, that within the fabric of a language, a normally episodic term, ... 85For discussion on this objection see Palmer, A. "Thinking and Performance. ... positions as confusions of indirect positions that carry-over assumptions from ... From Materials to Structures: Advancement through Innovation https://books.google.com/books?isbn=0203520017 Bijan Samali, Mario M. Attard, Chongmin Song - 2012 - Technology & Engineering Other 3D architecture of the fabric based on stitching several layers of woven 2D textile ... of the architectural effects of the 3D composite textile on the ballistic performance. ... and indirectly, on the ballistic resistance capability of the armour textiles. ... fabric are modelled and finite element analysis is performed to investigate ... Investigation of indirect oral operation method for think aloud usability ... dl.acm.org/citation.cfm?id=2021678 by M Hori - 2011 - Cited by 4 - Related articles Jul 9, 2011 - Investigation of indirect oral operation method for think aloud usability testing ..... system for enhancing human performance - especially for technical gestures, .... These systems, embedded in the fabric of our daily lives, are ... [PDF]Investigation of a Novel Dew Point Indirect Evaporative Air ... - Core https://core.ac.uk/download/pdf/2705415.pdf by Z Duan - 2011 - Cited by 26 - Related articles This study aims to improve the performance of existing indirect evaporative coolers. ... numerical simulation, experimental investigations and economic, environmental, ...... aluminium foil coating non-woven fabrics/coating by heat(ANF).
