建筑机械通风热回收系统实验性能分析

建筑机械通风热回收系统实验性能分析(中文3500字,英文2100字)
Francesco Asdrubalia, Giorgio Baldinellia,*, Francesco Bianchia, Matteo Cornicchiaa
a佩鲁贾州大学，工程–通过杜兰蒂部，67–06125佩鲁贾（意大利）
摘要
如今，使建筑物更加积极有效的元素不断的增加，比如墙和门窗热性能的改善，使密封的室内和室外环境之间形成了一道隔热屏障，同时这将减少空气渗入室内的可能性。在这种情况下减少了能源的消耗，但它将构成了一个问题，即室内空气质量和舒适性的降低。
为了减轻从外部环境连接到空气入口的热负荷（或冷负荷），机械通风系统和热回收系统变得越来越受欢迎；对于空气流量处理的高值，许多国家规定强制安装热回收系统。
实验测试台建于佩鲁贾大学的热工实验室，旨在评估空气热回收装置的性能。第一个测量进行了由聚苯乙烯制成的商业板式换热器。这种塑料材料的特点是低导热系数，不过其易加工的特性使得它允许增加的热交换表面积大大提高，同时也克服了产品重量和成本的问题。
流量、压力的下降，使得热交换器获得了其所引起地温度改变。在不同边界条件的室内和室外环境以及不同的空气流率下进行了热回收系统的能源效率指数评估的测试。将结果与从制造商收集的数据进行比较，值得关注的是实验结果和公司信息表之间的差异，很多的细节都显示出制造商所提供的信息通常不可用。
关键词：机械通风；效率；试验台设置

Experimental Performance Analyses of a Heat Recovery System for Mechanical Ventilation in Buildings
Francesco Asdrubalia, Giorgio Baldinellia,*, Francesco Bianchia, Matteo Cornicchiaa
aUniversity of Perugia, Department of Engineering – Via Duranti, 67 – 06125 Perugia (Italy)
Abstract
Nowadays the increasing trend to make buildings more and more energetically efficient leads to an improvement of the thermal performance of the elements such us walls, windows and doors, making the envelope a strong barrier between the indoor and outdoor environment, also for air infiltrations. If this circumstance results useful for energy consumption reduction, it constitutes a problem for indoor air quality and comfort.
Mechanical ventilation systems are often provided, and, at the aim of abating the thermal (or cooling) loads linked to the inlet of air from the external environment, heat recovery systems became more and more popular; for high values of air mass flow treated, many national regulations make the installation of heat recovery systems compulsory.
An experimental test bench was built at the Thermal Engineering Laboratory of the University of Perugia, aimed at evaluating the performance of air heat recovery devices. The first measurements were carried out on a commercial plate-type heat exchanger, made of polystyrene. This plastic material is characterized by a low value of thermal conductivity, but its easiness of workability allows to increase the heat exchange surface, overcoming also issues linked to the weight and the cost of the product.
The flow-rates, the pressure drops, and all temperatures of interest for the heat exchanger were acquired. The energy efficiency index of the heat recovery system was assessed with several tests conducted with different boundary conditions of the indoor and outdoor ambient, as well as different air flow rates.
Results were compared with data gathered from the manufacturer, highlighting the points of contact and the differences between the experimental outcomes and the company information sheet, providing further details that are commonly not available.