Improving the efficiency of heat exchanger using spray evaporative cooling

利用喷雾蒸发冷却提高换热器的效率

• 批准号: 518306-2017
• 负责人: Birouk, Madjid
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=640640
• 关键词: Improving; efficiency; heat; exchanger; using

In a water cooled air handler, which cools and heats the air supplied to a building, the cooling coil typicallyruns below the dew-point temperature of the incoming air in order to maximize sensible cooling capacity aswell as to provide dehumidification. The condensate that forms on the fins of the cooling coil is typicallycollected in a drainage system and is removed using sloped piping or a condensate pump. Since the temperatureof the condensate is close to the temperature of the coil fins, this scenario represents an untapped opportunityfor additional cooling. This is typical for heat exchanger units manufactured by Price industries Ltd, a Heating,Ventilation and Air-Conditioning (HVAC) company headquartered in Winnipeg, Manitoba. The objective ofthe company is to reuse the cold condensate in spray/evaporative cooling application to pre-cool the warm airbefore it reaches the cooling coil for additional cooling.It is expected that this approach would increase the cooling efficiency of the air handling unit. However, theimplementation of this concept requires a comprehensive optimization study with respect to the pertinentvariables of the spray flow (e.g., airflow velocity, water flow rate, droplets formation (spray) and distribution,etc) in order to maximize the amount of pre-cooling that can be achieved with the condensate. Quantifying theeffect of this evaporative pre-cooling on the latent capacity of the cooling coil would be another beneficialcomponent of this study/project.The objective of the proposed research is to develop an efficient spray cooling strategy to maximize liquid/airheat transfer of HVAC precooling systems. The resulting improvement in the efficiency of these units will helpincrease and strengthen the market share of Price Industries Ltd and consequently the Canadian HVACindustry.

在水冷却的空气处理器中，冷却和加热供应到建筑物的空气，冷却线圈通常在传入空气的露点温度以下运行，以最大程度地提高明智的冷却能力，以便提供除去的水。在冷却线圈鳍上形成的冷凝物通常在排水系统中收集，并使用倾斜的管道或冷凝水泵去除。由于冷凝物的温度接近线圈鳍的温度，因此这种情况代表了额外冷却的机会。这对于由Price Industries Ltd制造的热交换器单位是典型的，这是一家位于曼尼托巴省温尼伯市的供暖，通风和空调（HVAC）公司。该公司的目的是在喷雾/蒸发冷却应用中重复使用冷冷凝物，以预冷，然后再进入冷却线圈以进行额外冷却。预计这种方法会提高空气处理单元的冷却效率。但是，此概念的实施需要就喷雾流的相关性（例如，气流速度，水流速，水滴形成（喷雾）和分布等）进行全面的优化研究，以使预冷量最大化这可以通过冷凝物来实现。量化这种蒸发性预冷对冷却线圈的潜能的影响将是本研究/项目的另一个有益组件。拟议的研究的目的是制定有效的喷雾冷却策略，以最大程度地提高HVAC预冷系统的液体/空气热量转移。这些单位效率的提高将有助于加入和加强Price Industries Ltd的市场份额以及加拿大的Hvacindustry。