Reducing heat gain in buildings by artificially lowering the outside air temperature through evaporative cooling

S. Egnatosyan, N. Egnatosyan, Lusine A. Yeritsyan
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Abstract

Introduction. Systems for microclimate regulation in buildings consume a large amount of natural energy resources. Statistics show that 40 % of energy is used for heating, ventilation and air conditioning. This problem is directly related to the heating and cooling load of the building, i.e. it depends on the thermal engineering characteristics of building envelopes and the thermal protection of the building. Materials and methods. To reduce the consumption of energy resources, the most common method is the thermal insulation of enclosing structures, increasing the thermal resistance of enclosing structures, which is a complicated thermal engineering problem. An alternative new method of reducing heat gain into buildings through evaporative cooling of outside air which leads to reduction of cooling load of building and subsequently influences the reduction of greenhouse gas emissions is considered. For this purpose, a spray irrigation system is installed on the southern wall of the building to lower the conditional boundary layer temperature which is formed as a result of solar radiation. Results. The suggested method passively reduces the boundary layer temperature, which tends to the temperature of the wet-bulb thermometer, as a result, the heat influx into the building is reduced, which leads to a lower cooling load and increases the energy efficiency of the system. Conclusions. Green architecture and zero-energy building design are relevant and important at the present time. World statistics show that 14 % of all potable water is used in buildings, in order to use potable water economically the proposed system installs a rainwater accumulation tank for outdoor irrigation. A comparative analysis showed that by cooling evaporation and artificially lowering the outside air temperature, the cooling load of the building is reduced by 20 %, which results in a reduction of greenhouse gas emissions.
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通过蒸发冷却,人为地降低室外空气温度,从而减少建筑物的热量增加
介绍。建筑微气候调节系统消耗大量的自然能源。据统计,40%的能源用于供暖、通风和空调。这个问题直接关系到建筑的冷热负荷,即取决于建筑围护结构的热工特性和建筑的热防护。材料和方法。为了减少能源的消耗,最常用的方法是对围护结构进行保温,增加围护结构的热阻,这是一个复杂的热工问题。本文考虑了一种通过外部空气蒸发冷却来减少建筑物热增益的新方法,这种方法可以减少建筑物的冷负荷,从而影响温室气体排放的减少。为此,在建筑的南墙安装了喷灌系统,以降低由于太阳辐射而形成的条件边界层温度。结果。该方法被动降低边界层温度,使边界层温度趋于湿球式温度计的温度,从而减少进入建筑物的热量,从而降低冷负荷,提高系统的能效。结论。绿色建筑和零能耗建筑设计是当今时代的重要课题。世界统计数据显示,14%的饮用水用于建筑物,为了经济地使用饮用水,建议系统安装一个雨水蓄水池用于室外灌溉。对比分析表明,通过冷却蒸发和人为降低室外空气温度,建筑物的冷负荷减少了20%,从而减少了温室气体的排放。
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发文量
101
审稿时长
8 weeks
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